| 1. |
- Gustafsson, Berit M., 1966-, et al.
(författare)
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Hyperactivity precedes conduct problems in preschool children : a longitudinal study.
- 2018
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Ingår i: BJPsych Open. - : Cambridges Institutes Press. - 2056-4724. ; 4:4, s. 186-191
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Tidskriftsartikel (refereegranskat)abstract
- Background: Externalising problems are among the most common symptoms of mental health problems in preschool children.Aims: To investigate the development of externalising problems in preschool children over time, and the way in which conduct problems are linked to hyperactivity problems.Method: In this longitudinal study, 195 preschool children were included. Latent growth modelling of conduct problems was carried out, with gender and hyperactivity at year 1 as time-invariant predictors.Results: Hyperactivity was a significant predictor for the intercept and slope of conduct problems. Children with more hyperactivity at year 1 had more conduct problems and a slower reduction in conduct problems. Gender was a significant predictor for the slope of conduct problems.Conclusions: Children with more initial hyperactivity have less of a reduction in conduct problems over time. It is important to consider the role of hyperactivity in studies of the development of conduct problems.Declaration of interest: None.
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| 2. |
- Gustafsson, Karin L., 1987, et al.
(författare)
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The role of membrane ER alpha signaling in bone and other major estrogen responsive tissues
- 2016
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Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 6
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Tidskriftsartikel (refereegranskat)abstract
- Estrogen receptor a (ER alpha) signaling leads to cellular responses in several tissues and in addition to nuclear ER alpha-mediated effects, membrane ER alpha (mER alpha) signaling may be of importance. To elucidate the significance, in vivo, of mER alpha signaling in multiple estrogen-responsive tissues, we have used female mice lacking the ability to localize ER alpha to the membrane due to a point mutation in the palmitoylation site (C451A), so called Nuclear-Only-ER (NOER) mice. Interestingly, the role of mER alpha signaling for the estrogen response was highly tissue-dependent, with trabecular bone in the axial skeleton being strongly dependent (>80% reduction in estrogen response in NOER mice), cortical and trabecular bone in long bones, as well as uterus and thymus being partly dependent (40-70% reduction in estrogen response in NOER mice) and effects on liver weight and total body fat mass being essentially independent of mER alpha (<35% reduction in estrogen response in NOER mice). In conclusion, mER alpha signaling is important for the estrogenic response in female mice in a tissue-dependent manner. Increased knowledge regarding membrane initiated ER alpha actions may provide means to develop new selective estrogen receptor modulators with improved profiles.
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| 3. |
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| 4. |
- Appleby, Ralph, et al.
(författare)
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Examining Perceptions of Teammates' Burnout and Training Hours in Athlete Burnout
- 2018
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Ingår i: Journal of Clinical Sport Psychology. - : Human Kinetics. - 1932-9261 .- 1932-927X. ; 12:3, s. 316-332
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Tidskriftsartikel (refereegranskat)abstract
- Perceptions of teammates and training load have been shown to influence athletes' physical and psychological health; however, limited research has investigated these factors in relation to burnout. Athletes (N = 140) from a variety of competitive team sports, ranging in level from regional to professional, completed questionnaires measuring individual burnout, perceptions of teammates' burnout, and training hours perweek on two occasions separated by threemonths. After controlling for burnout at time one, training hours were associated with athletes' burnout and perceptions of teammates' burnout at time two. Multilevel modeling indicated actual team burnout (i.e., the average burnout score of the individual athletes in a team) and perceived team burnout were associated with individual's own burnout. The findings highlight that burnout is dynamic and relates to physiological stressors associated with training and psychological perceptions of teammates' burnout. Future research directions exploring potential social influences on athlete burnout are presented.
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| 5. |
- Börjesson, Marcus, 1979-, et al.
(författare)
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Flotation REST as a Stress Reduction Method : The Effects on Anxiety, Muscle Tension, and Performance
- 2018
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Ingår i: Journal of Clinical Sport Psychology. - : Human Kinetics. - 1932-9261 .- 1932-927X. ; 12:3, s. 333-346
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of the study was to investigate the influence of flotation REST upon skilled and less skilled golfers’ anxiety in terms of physiological indicators of stress, self-rated anxiety scores, muscle tension, and the effect on golf putting. Prior to performing the putting task participants underwent a treatment of flotation REST or a period of resting in an armchair. Participants completed both treatments in a randomized order with a two-week interval. The results showed that both flotation REST and the armchair treatment reduced systolic blood pressure and heart rate, with no differences between treatments or athlete skill levels. No significant differences between treatments were revealed regarding self-ratings, level of muscle tension or putting precision. The results indicate that flotation REST may be useful for reducing negative symptoms related to stress and anxiety in general; however, no support for direct positive effects on golf performance were found.
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| 6. |
- Davis, Louise, 1982-, et al.
(författare)
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Reducing the risk of athlete burnout: Psychosocial, sociocultural, and individual considerations for coaches
- 2019
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Ingår i: International Journal of Sports Science & Coaching. - : SAGE Publications. - 1747-9541 .- 2048-397X. ; 14:4, s. 444-452
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Tidskriftsartikel (refereegranskat)abstract
- Past research suggests that athletes' relationships with their coach can act as a risk factor in the development of burnout. Coaching practice may be enhanced through understanding the multidimensional factors that can augment the associations between coach-athlete relationship quality and athlete burnout. The present study explored both individual difference characteristics (gender, age, and sport level) and sociocultural factors (sport type) as moderators of this relationship. Our findings show statistically significant interaction effects for gender and age. Coaches and practitioners working with younger athletes and male performers in particular, are advised to work with strategies aiming to build relationships and reduce the risk of burnout.
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| 7. |
- Davis, Louise, 1982-, et al.
(författare)
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The role of coach-athlete relationship quality in team sport athletes’ psychophysiological exhaustion : implications for physical and cognitive performance
- 2018
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Ingår i: Journal of Sports Sciences. - : Taylor & Francis. - 0264-0414 .- 1466-447X. ; 17, s. 1985-1992
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Tidskriftsartikel (refereegranskat)abstract
- The present study aimed to examine associations between the quality of the coach-athlete relationship and athlete exhaustion by assessing physiological and cognitive consequences. Male and female athletes (N = 82) representing seven teams across four different sports, participated in a quasi-experimental study measuring physical performance on a 5-meter multiple shuttle test, followed by a Stroop test to assess cognitive performance. Participants provided saliva samples measuring cortisol as a biomarker of acute stress response and completed questionnaires measuring exhaustion, and coach-athlete relationship quality. Structural equation modelling revealed a positive relationship between the quality of the coach-athlete relationship and Stroop performance, and negative relationships between the quality of the coach-athlete relationship and cortisol responses to high-intensity exercise, cognitive testing, and exhaustion. The study supports previous research on socio-cognitive correlates of athlete exhaustion by highlighting associations with the quality of the coach-athlete relationship. © 2018 Informa UK Limited, trading as Taylor & Francis Group
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| 8. |
- Farman, Helen H., 1983, et al.
(författare)
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Membrane estrogen receptor alpha is essential for estrogen signaling in the male skeleton
- 2018
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Ingår i: Journal of Endocrinology. - : Bioscientifica. - 0022-0795 .- 1479-6805. ; 239:3, s. 303-312
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Tidskriftsartikel (refereegranskat)abstract
- The importance of estrogen receptor alpha (ER alpha) for the regulation of bone mass in males is well established. ERa mediates estrogenic effects both via nuclear and membraneinitiated ER alpha (mER alpha) signaling. The role of mERa signaling for the effects of estrogen on bone in male mice is unknown. To investigate the role of mERa signaling, we have used mice (Nuclear-Only-ER; NOER) with a point mutation (C451A), which results in inhibited trafficking of ER alpha to the plasma membrane. Gonadal-intact male NOER mice had a significantly decreased total body areal bone mineral density (aBMD) compared to WT littermates at 3, 6 and 9 months of age as measured by dual-energy X-ray absorptiometry (DEXA). High-resolution microcomputed tomography (mu CT) analysis of tibia in 3-month-old males demonstrated a decrease in cortical and trabecular thickness in NOER mice compared to WT littermates. As expected, estradiol (E2) treatment of orchidectomized (ORX) WT mice increased total body aBMD, trabecular BV/TV and cortical thickness in tibia compared to placebo treatment. E2 treatment increased these skeletal parameters also in ORX NOER mice. However, the estrogenic responses were significantly decreased in ORX NOER mice compared with ORX WT mice. In conclusion, mER alpha is essential for normal estrogen signaling in both trabecular and cortical bone in male mice. Increased knowledge of estrogen signaling mechanisms in the regulation of the male skeleton may aid in the development of new treatment options for male osteoporosis.
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| 9. |
- Gerber, Markus, et al.
(författare)
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Cross-Sectional and Longitudinal Associations Between Athlete Burnout, Insomnia, and Polysomnographic Indices in Young Elite Athletes
- 2018
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Ingår i: Journal of Sport & Exercise Psychology (JSEP). - CHAMPAIGN, IL, USA : Human Kinetics. - 0895-2779 .- 1543-2904. ; 40:6, s. 312-324
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Tidskriftsartikel (refereegranskat)abstract
- Few studies have examined the association between sleep and burnout symptoms in elite athletes. We recruited 257 young elite athletes (M-age = 16.8 years) from Swiss Olympic partner schools. Of these, 197 were reassessed 6 months later. Based on the first assessment, 24 participants with clinically relevant burnout symptoms volunteered to participate in a polysomnographic examination and were compared with 26 (matched) healthy controls. Between 12% and 14% of young elite athletes reported burnout symptoms of potential clinical relevance, whereas 4-11% reported clinically relevant insomnia symptoms. Athletes with clinically relevant burnout symptoms reported significantly more insomnia symptoms, more dysfunctional sleep-related cognitions, and spent less time in bed during weeknights (p<.05). However, no significant differences were found for objective sleep parameters. A cross-lagged panel analysis showed that burnout positively predicted self-reported insomnia symptoms. Cognitive-behavioral interventions to treat dysfunctional sleep-related cognitions might be a promising measure to reduce subjective sleep complaints among young elite athletes.
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| 10. |
- Gerber, Markus, et al.
(författare)
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Effects of stress and mental toughness on burnout and depressive symptoms : A prospective study with young elite athletes
- 2018
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Ingår i: Journal of Science and Medicine in Sport. - : Elsevier. - 1440-2440 .- 1878-1861. ; 21:12, s. 1200-1205
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: To examine in a sample of young elite athletes (a) the presence of clinically relevant symptoms of burnout and depression, and (b) a possible interaction of perceived stress and mental toughness in the prediction of burnout and depressive symptoms. Design: 6-month prospective study. Methods: A representative sample of 257 young elite athletes (M = 16.82 years, SD = 1.44, 36% females) was recruited in North–Western Switzerland. 197 athletes were followed-up across a 6-month period. Burnout was assessed with the Shirom-Melamed Burnout Measure (SMBM), and depression with the 9-item depression module of the Patient Health Questionnaire (PHQ). Values of ≥4.40 (SMBM) and >14 (PHQ-9) were considered indicative of clinically relevant burnout or depression. Stress perceptions were assessed with the Perceived Stress Scale (PSS), and mental toughness with the Mental Toughness Questionnaire (MTQ). Hierarchical regression analyses were used to test stress-buffering effects. Results: The percentage of athletes with clinically relevant levels of burnout and depressive symptoms was 12% and 9%, respectively. Both cross-sectional and prospective analyses showed that compared to participants with low mental toughness, those with higher mental toughness scores reported significantly fewer mental health issues, when exposed to high stress. By contrast, when stress levels were low, mental toughness was unrelated to psychological health complaints. Conclusions: About every tenth young elite athlete reported burnout or depressive symptoms of potential clinical relevance. While high perceived stress was associated with increased psychological health complaints, mental toughness was able to off-set some of the negative consequences resulting from high stress exposure.
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| 11. |
- Gerber, M., et al.
(författare)
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Implicit and explicit attitudes towards sport among young elite athletes with high versus low burnout symptoms
- 2019
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Ingår i: Journal of Sports Sciences. - : Routledge. - 0264-0414 .- 1466-447X. ; 37:14, s. 1673-1680
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Tidskriftsartikel (refereegranskat)abstract
- The development of cynical attitudes towards elite sport is a core symptom of athlete burnout and has been associated with dropout from elite sport. To date, this phenomenon has mainly been studied by investigating explicit attitudes towards sport, whereas athletes’ automatic evaluations (i.e. implicit attitudes) that have been shown to influence behavior as well were not considered. This study aimed to compare explicit and implicit attitudes towards sport of young elite athletes with high (N = 24) versus low (N = 26) burnout symptoms. Using self-reported measures, general and athlete burnout symptoms were assessed. Additionally, a single-target implicit association test was administered to examine participants’ automatic evaluation of sport. Statistical analysis revealed greater emotional/physical exhaustion and sport devaluation in athletes reporting high compared to low burnout symptoms. Implicit attitudes towards sport did not significantly differ between the groups. Furthermore, no significant correlations were observed between different athlete burnout symptoms and implicit attitudes. Athletes with high burnout symptoms show a tendency to explicitly detach themselves from sport, thus fostering sport devaluation as a core symptom of athlete burnout. However, this process does not seem to be reflected in their implicit attitudes towards sport.
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| 12. |
- Gerber, Markus, et al.
(författare)
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Usefulness of the Athlete Burnout Questionnaire (ABQ) as a screening tool for the detection of clinically relevant burnout symptoms among young elite athletes
- 2018
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Ingår i: Psychology of Sport And Exercise. - : Elsevier. - 1469-0292 .- 1878-5476. ; 39, s. 104-113
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: Having psychometrically sound instruments is essential to the understanding of the determinants and consequences of athlete burnout. Therefore, this study examines the psychometric properties of a German version of the Athlete Burnout Questionnaire (ABQ) and its usefulness as a screening tool for the detection of clinically relevant burnout symptoms. Design: Prospective study. Method: 257 young elite athletes were recruited from Swiss Olympic Sport Classes (37% females; M = 16.8 years, SD = 1.4). 197 students were assessed a second time after six months. All students filled in a standardized questionnaire about domain-specific and domain-unspecific burnout symptoms, depressive symptoms, stress, and life satisfaction. Results: Confirmatory factor analysis supported the three-factor structure of the ABQ. Moreover, all subscales had acceptable internal consistency. Support was also found for the convergent validity of the ABQ; all subscales were positively correlated with perceived stress, burnout and depression, whereas negative correlations existed with life satisfaction. By contrast, some ABQ subscales shared only limited variance, the three ABQ subscales did not predict each other across time, and none of the ABQ subscales was suitable for the screening of clinically relevant burnout symptoms. Conclusions: While the factor structure and internal consistency of the ABQ was supported, our study corroborates previous concerns about the psychometric properties and validity of the ABQ. While the ABQ has advanced research on athlete burnout, we hold that further debates about the most suitable way to assess burnout among elite athletes are urgently needed.
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| 13. |
- Gustafsson, Henrik, 1974-, et al.
(författare)
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Athlete burnout : review and recommendations
- 2017
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Ingår i: Current opinion in psychology. - : Elsevier BV. - 2352-250X. ; 16, s. 109-113
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Tidskriftsartikel (refereegranskat)abstract
- Over the last two decades, growing concerns regarding the negative implications of athlete burnout have spurred empirical research on the topic. In their citation network analysis of the burnout literature, Gustafsson et al. (2014), cited well over 100 publications on the syndrome. Despite considerable investigation into athlete burnout, there remain a number of unresolved questions and issues. Four main aims guide the current review. First, we highlight various models of athlete burnout. Second, we discuss the measurement of athlete burnout. Third, we describe the symptoms, antecedents, and consequences of athlete burnout with a focus on social perceptions and perfectionism. Finally, we provide suggestions for the prevention and treatment of athlete burnout via an illustration of links between theory and practice. It is our hope that this review can stimulate future research in order to help athletes avoid burnout and other severe forms of training maladaptation.
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| 14. |
- Gustafsson, Henrik, 1974-, et al.
(författare)
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Cognitive behavioral intervention in sport psychology : A case illustration of the exposure method with an elite athlete
- 2016
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Ingår i: Journal of Sport Psychology in Action. - : Routledge. - 2152-0704 .- 2152-0712. ; 8:3, s. 152-162
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Tidskriftsartikel (refereegranskat)abstract
- One common method in Cognitive behavior therapy (CBT) to treat anxiety problems is exposure, but there are few articles examining its applicability to sport. The aim of this article is to give a background of the use of exposure in sport and present a case of how exposure can be used with athletes. The athlete was a 17-year-old female cross-country skier with high levels of performance anxiety. In the case description, common procedures in CBT such as behavioral analysis, psychoeducation, and exposure are presented, as well as how anxiety can be managed. After the intervention the athlete perceived lower levels of anxiety as well as improved behavioral repertoire (e.g., less avoidant behaviors and more functional sport-specific behaviors). This case may be used to help practitioners consider the use of exposure in competitive sports.
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| 15. |
- Gustafsson, Henrik, 1974-, et al.
(författare)
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Conceptual Confusion and Potential Advances in Athlete Burnout Research
- 2016
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Ingår i: Perceptual and Motor Skills. - : SAGE Publications. - 0031-5125 .- 1558-688X. ; 123:3, s. 784-791
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Tidskriftsartikel (refereegranskat)abstract
- More than 30 years of research on athlete burnout has yielded important insights and questions regarding the onset, nature, and consequences of this detrimental syndrome. Not surprisingly, burnout is considered an important matter, both from a research and practical standpoint. We comment on the work of Ryu, Ali, Kim, Choi, and Radlo, who examined the impact of burnout on cognitive performance among athletes.
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| 16. |
- Gustafsson, Henrik, 1974-, et al.
(författare)
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Fear of failure, psychological stress, and burnout among adolescent athletes competing in high level sport
- 2017
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Ingår i: Scandinavian Journal of Medicine and Science in Sports. - : John Wiley & Sons. - 0905-7188 .- 1600-0838. ; 27:12, s. 2091-2102
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of this study was to investigate fear of failure in highly competitive junior athletes and the association with psychological stress and burnout. In total 258 athletes (152 males and 108 females) ranged in age from 15 to 19years (M=17.4years, SD=1.08) participated. Athletes competed in variety of sports including both team and individual sports. Results showed in a variable-oriented approach using regression analyses that one dimension, fear of experiencing shame and embarrassment had a statistically significant effect on perceived psychological stress and one dimension of burnout, reduced sense of accomplishment. However, adopting a person-oriented approach using latent class analysis, we found that athletes with high levels of fear failure on all dimensions scored high on burnout. We also found another class with high scores on burnout. These athletes had high scores on the individual-oriented dimensions of fear of failure and low scores on the other oriented fear of failure dimensions. The findings indicate that fear of failure is related to burnout and psychological stress in athletes and that this association is mainly associated with the individual-oriented dimensions of fear of failure.
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| 17. |
- Gustafsson, Henrik, 1974-, et al.
(författare)
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Motivational profiles and burnout in elite athletes: A person-centered approach
- 2018
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Ingår i: Psychology of Sport And Exercise. - : Elsevier BV. - 1469-0292 .- 1878-5476. ; 35, s. 118-125
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to assess the link between elite athletes' motivational profiles and burnout using a person-centered approach. Participants were 391 Spanish elite athletes (201 males and 190 females), aged 16-30 years who completed questionnaires measuring demographic information, self-determined motivation, and athlete burnout. Latent profile analysis resulted in a five profile solution labeled: amotivation (Class 1), low motivation (Class 2), moderately autonomous motivation (Class 3), amotivated and moderately controlled motivation (Class 4), and highly motivated (Class 5). While no significant differences were found in emotional/physical exhaustion, Class 4 (amotivated and moderately controlled motivation) scored higher than classes 2 (low motivation), 3 (moderately autonomous motivation), and 5 (highly motivated) on a Reduced sense of Accomplishment and Sport Devaluation. Findings are discussed in relation to Self-Determination Theory, suggesting that the quality of one's motivation may be equally, if not more important than the quantity of motivation in determining subsequent health, well-being, and performance outcomes.
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| 18. |
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| 19. |
- Gustafsson, Henrik, 1974-, et al.
(författare)
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Performance based self-esteem and athlete-identity in athlete burnout : A person-centered approach
- 2018
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Ingår i: Psychology of Sport And Exercise. - : Elsevier. - 1469-0292 .- 1878-5476. ; 38, s. 56-60
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Tidskriftsartikel (refereegranskat)abstract
- Performance-based self-esteem and a self-identity dominated by being an athlete have been associated with athlete burnout. Our aim is to extend previous research by adopting a person-centered approach and examining whether profiles of burnout can be identified based on the athletes’ identity and performance-based self-esteem. Swedish junior athletes completed measures of athlete burnout, athlete identity, and performance-based self-esteem. Latent profile analysis identified four groups: Low burnout profile (n = 131), Moderate burnout profile (n = 178), Moderately high burnout profile (n = 125) and High burnout profile (n = 37). Higher scores of athletic identity were significantly less likely to be in the high burnout profile and athletes with higher scores of performance-based self-esteem were significantly more likely to be in the high burnout profile compared to the other three burnout profiles. These findings suggest that athletes with a performance-based self-esteem might be at greater risk of experiencing burnout.
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| 20. |
- Gustafsson, Henrik, 1974-, et al.
(författare)
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Profiles of perfectionism, parental climate, and burnout among competitive junior athletes
- 2016
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Ingår i: Scandinavian Journal of Medicine and Science in Sports. - : Wiley-Blackwell. - 0905-7188 .- 1600-0838. ; 26:10, s. 1256-1264
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Tidskriftsartikel (refereegranskat)abstract
- Recent research suggests that groups of athletes can be identified that differ in terms of perfectionism and perceptions of achievement climate. Moreover, these groups also differ in terms of burnout symptoms. The purpose of the current study was to extend this research by examining whether discernable groups can be identified based on scores of perfectionism and perceptions of parent-initiated climate and, then, whether these groups differ in terms of burnout. Two-hundred and thirty-seven Swedish junior athletes (124 male and 113 female aged 16-19) from a variety of sports completed measures of athlete burnout, multidimensional perfectionism, and parent-initiated motivational climate. Latent profile analysis identified four groups: non-perfectionistic athletes in a task-oriented climate, moderately perfectionistic athletes in a task-oriented climate, highly perfectionistic athletes in a task-oriented climate, and highly perfectionistic athletes in a mixed climate. The latter two groups reported higher levels of burnout in comparison to other groups. The findings suggest that junior athletes high in perfectionism may be at comparatively greater risk to burnout and that this may especially be the case when they perceive their parents to emphasize concerns about failure and winning without trying one's best.
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| 21. |
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| 22. |
- Gustafsson, Jenny K, 1981, et al.
(författare)
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Carbachol-induced colonic mucus formation requires transport via NKCC1, K(+) channels and CFTR.
- 2015
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Ingår i: Pflugers Archiv : European journal of physiology. - : Springer Science and Business Media LLC. - 1432-2013 .- 0031-6768. ; 467:7, s. 1403-1415
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Tidskriftsartikel (refereegranskat)abstract
- The colonic mucosa protects itself from the luminal content by secreting mucus that keeps the bacteria at a distance from the epithelium. For this barrier to be effective, the mucus has to be constantly replenished which involves exocytosis and expansion of the secreted mucins. Mechanisms involved in regulation of mucus exocytosis and expansion are poorly understood, and the aim of this study was to investigate whether epithelial anion secretion regulates mucus formation in the colon. The muscarinic agonist carbachol was used to induce parallel secretion of anions and mucus, and by using established inhibitors of ion transport, we studied how inhibition of epithelial transport affected mucus formation in mouse colon. Anion secretion and mucin exocytosis were measured by changes in membrane current and epithelial capacitance, respectively. Mucus thickness measurements were used to determine the carbachol effect on mucus growth. The results showed that the carbachol-induced increase in membrane current was dependent on NKCC1 co-transport, basolateral K(+) channels and Cftr activity. In contrast, the carbachol-induced increase in capacitance was partially dependent on NKCC1 and K(+) channel activity, but did not require Cftr activity. Carbachol also induced an increase in mucus thickness that was inhibited by the NKCC1 blocker bumetanide. However, mice that lacked a functional Cftr channel did not respond to carbachol with an increase in mucus thickness, suggesting that carbachol-induced mucin expansion requires Cftr channel activity. In conclusion, these findings suggest that colonic epithelial transport regulates mucus formation by affecting both exocytosis and expansion of the mucin molecules.
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| 23. |
- Hassmén, Peter, et al.
(författare)
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Burnout symptoms and recovery processes in eight elite soccer coaches over 10 years
- 2019
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Ingår i: International journal of sports science & coaching. - : Sage Publications. - 1747-9541 .- 2048-397X. ; 14:4, s. 431-443
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Tidskriftsartikel (refereegranskat)abstract
- Elite sport can be stressful, which increases the risk for burnout symptoms to develop. Especially when not balanced with sufficient recovery. To study the burnout–recovery process, eight elite soccer coaches were followed for 10 years. All eight were active elite coaches at the inception of this study and reported elevated emotional exhaustion scores on Maslach’s Burnout Inventory Educators Survey (MBI-ES). The coaches completed MBI-ES three additional times (year 3, 7, and 10), and they were also interviewed on the same occasions. At the 3-year follow-up, seven of the eight coaches reduced their exhaustion scores. The coach presenting with unchanged scores both at the 3 - and 7-year follow-up was the only one still coaching at the elite level. All coaches revealed during the interviews that they struggled to manage their work–life balance well; some worked too many hours, some experienced difficulty in managing conflicting role-demands, and some wrestled with external pressures. Their approach to recovery was, however, similar. Apart from moving away from coaching at the elite level, they unanimously mentioned that they changed their approach to coaching to make recovery possible. They achieved the latter by, for example, increasing control and delegating responsibility. According to our longitudinal results, burnout frequently regarded as an end-state can decrease over time. Provided that decisive action is taken to change situational factors and personal demands. This frequently meant withdrawing from coaching, which in turn explains why coach retention remains a serious challenge for most organizations with teams/athletes competing at the elite level. © The Author(s) 2019.
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| 24. |
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| 25. |
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| 26. |
- Josefsson, Torbjörn, 1965-, et al.
(författare)
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Effects of Mindfulness-Acceptance-Commitment (MAC) on Sport-Specific Dispositional Mindfulness, Emotion Regulation, and Self-Rated Athletic Performance in a Multiple-Sport Population : an RCT Study
- 2019
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Ingår i: Mindfulness. - New York, NY : Springer. - 1868-8527 .- 1868-8535. ; 10:8, s. 1518-1529
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Tidskriftsartikel (refereegranskat)abstract
- ObjectivesThe aim of the study was to examine mediating effects of emotion regulation and sport-specific dispositional mindfulness on self-rated athletic training performance, following the Mindfulness-Acceptance-Commitment (MAC) intervention, compared to a Psychological Skills Training (PST) control group.MethodsSixty-nine competitive elite athletes who did not have any prior experience with mindfulness- and acceptance-based exercises, were recruited and randomly assigned into either a MAC group or a traditional PST group. Latent growth curve analyses were performed to examine longitudinal relationships among the study variables. Mediation analyses were conducted to test if the growth trajectory of each of the proposed mediators mediated the relationship between the intervention and perceived performance (measured at T3).ResultsFindings showed that the MAC intervention had an indirect effect on self-rated athletic training performance through changes in dispositional mindfulness and emotion regulation respectively. Further, the MAC- group obtained greater post-test improvements in athletic mindfulness, emotion regulation abilities, and perceived performance compared to the PST group.ConclusionsOverall, findings suggest that dispositional athletic mindfulness and emotion regulation may function as important mechanisms in MAC, and that the MAC approach is a more effective intervention compared to the PST condition in reducing emotion regulation difficulties, as well as enhancing sport-relevant mindfulness skills and perceived athletic training performance in elite sport.
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| 27. |
- Josefsson, Torbjörn, 1965-, et al.
(författare)
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Mindfulness Mechanisms in Sports: Mediating Effects of Rumination and Emotion Regulation on Sport-Specific Coping
- 2017
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Ingår i: Mindfulness. - New York, NY : Springer Science and Business Media LLC. - 1868-8527 .- 1868-8535. ; 8:5, s. 1354-1363
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Tidskriftsartikel (refereegranskat)abstract
- The main objective of the project was to examine a proposed theoretical model of mindfulness mechanisms in sports. We conducted two studies (the first study using a cross-sectional design and the second a longitudinal design) to investigate if rumination and emotion regulation mediate the relation between dispositional mindfulness and sport-specific coping. Two hundred and forty-two young elite athletes, drawn from various sports, were recruited for the cross-sectional study. For the longitudinal study, 65 elite athletes were recruited. All analyses were performed using Bayesian statistics. The path analyses showed credible indirect effects of dispositional mindfulness on coping via rumination and emotion regulation in both the cross-sectional study and the longitudinal study. Additionally, the results in both studies showed credible direct effects of dispositional mindfulness on rumination and emotion regulation. Further, credible direct effects of emotion regulation as well as rumination on coping were also found in both studies. Our findings support the theoretical model, indicating that rumination and emotion regulation function as essential mechanisms in the relation between dispositional mindfulness and sport-specific coping skills. Increased dispositional mindfulness in competitive athletes (i.e. by practicing mindfulness) may lead to reductions in rumination, as well as an improved capacity to regulate negative emotions. By doing so, athletes may improve their sport-related coping skills, and thereby enhance athletic performance.
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| 28. |
- Jowett, Sophia, et al.
(författare)
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Motivational processes in the coach-athlete relationship : A multi-cultural self-determination approach
- 2017
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Ingår i: Psychology of Sport And Exercise. - : Elsevier. - 1469-0292 .- 1878-5476. ; 32, s. 143-152
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Tidskriftsartikel (refereegranskat)abstract
- Objective: Grounded in self-determination theory, the present study examined the cultural invariance of a model that hypothesized sport performers' well-being will be predicted by both their perceptions of motivation and the quality of the relationship held with their coach. Method: Participants (N = 756), originating from five countries (British, Chinese, Greek, Spanish, and Swedish), completed a questionnaire that measured perceived coach-athlete relationship quality, basic psychological need satisfaction, self-determined motivation, and well-being. Structural equation modeling (SEM) was employed to analyze the data. Results: Analysis revealed that athletes who perceived a high quality relationship experienced heightened levels of basic need satisfaction. Need satisfaction positively predicted self-determined motivation, which, in turn, linked to enhanced well-being. Moreover, mediation analyses supported the explanatory roles of need satisfaction and self-determined motivation within the model. Lastly, multi-sample SEM invariance testing revealed the model to be largely invariant across cultures. Conclusions: The results support the universal application of self-determination theory and the central role interpersonal relationships play in promoting well-being. Crown Copyright (C) 2017 Published by Elsevier Ltd. All rights reserved.
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| 29. |
- Kilpeläinen, Tuomas O, et al.
(författare)
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Genome-wide meta-analysis uncovers novel loci influencing circulating leptin levels
- 2016
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 7
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Tidskriftsartikel (refereegranskat)abstract
- Leptin is an adipocyte-secreted hormone, the circulating levels of which correlate closely with overall adiposity. Although rare mutations in the leptin (LEP) gene are well known to cause leptin deficiency and severe obesity, no common loci regulating circulating leptin levels have been uncovered. Therefore, we performed a genome-wide association study (GWAS) of circulating leptin levels from 32,161 individuals and followed up loci reaching P<10(-6) in 19,979 additional individuals. We identify five loci robustly associated (P<5 × 10(-8)) with leptin levels in/near LEP, SLC32A1, GCKR, CCNL1 and FTO. Although the association of the FTO obesity locus with leptin levels is abolished by adjustment for BMI, associations of the four other loci are independent of adiposity. The GCKR locus was found associated with multiple metabolic traits in previous GWAS and the CCNL1 locus with birth weight. Knockdown experiments in mouse adipose tissue explants show convincing evidence for adipogenin, a regulator of adipocyte differentiation, as the novel causal gene in the SLC32A1 locus influencing leptin levels. Our findings provide novel insights into the regulation of leptin production by adipose tissue and open new avenues for examining the influence of variation in leptin levels on adiposity and metabolic health.
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| 30. |
- Li, Chunxiao, et al.
(författare)
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Mindfulness and Athlete Burnout : A Systematic Review and Meta-Analysis
- 2019
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Ingår i: International Journal of Environmental Research and Public Health. - : NLM (Medline). - 1661-7827 .- 1660-4601. ; 16:3, s. 449-
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Tidskriftsartikel (refereegranskat)abstract
- Objective: This review aims to identify, appraise, and synthesize studies reporting the relationship between mindfulness and athlete burnout and the effects of mindfulness-based interventions (MBIs) on athlete burnout. Methods: Studies were identified through searching six electronic databases using combinations of three groups of keywords and manual search. Two independent reviewers screened the searched studies, extracted data of the included studies, and assessed the study quality. The extracted data were synthesized qualitatively and quantitatively. Results: Ten studies consisting of two controlled trials, six surveys, and two interview studies met the inclusion criteria. The two controlled trials had weak methodological quality, and the remaining studies were of moderate to high research quality. Results of controlled trials and interview research generally showed that MBIs had positive effects in burnout prevention. Meta-analytic results indicated a negative association between mindfulness and burnout. Conclusions: There is some evidence showing that mindfulness was negatively associated with athlete burnout. However, given the small number of interventions and qualitative studies, there is limited evidence on whether MBIs are useful in preventing athlete burnout. More studies are needed to corroborate these findings.
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| 31. |
- Locke, Adam E, et al.
(författare)
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Genetic studies of body mass index yield new insights for obesity biology.
- 2015
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 518:7538, s. 197-401
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Tidskriftsartikel (refereegranskat)abstract
- Obesity is heritable and predisposes to many diseases. To understand the genetic basis of obesity better, here we conduct a genome-wide association study and Metabochip meta-analysis of body mass index (BMI), a measure commonly used to define obesity and assess adiposity, in up to 339,224 individuals. This analysis identifies 97 BMI-associated loci (P < 5 × 10(-8)), 56 of which are novel. Five loci demonstrate clear evidence of several independent association signals, and many loci have significant effects on other metabolic phenotypes. The 97 loci account for ∼2.7% of BMI variation, and genome-wide estimates suggest that common variation accounts for >20% of BMI variation. Pathway analyses provide strong support for a role of the central nervous system in obesity susceptibility and implicate new genes and pathways, including those related to synaptic function, glutamate signalling, insulin secretion/action, energy metabolism, lipid biology and adipogenesis.
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| 32. |
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| 33. |
- Lundkvist, Erik, Fil Dr, 1978-, et al.
(författare)
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The temporal relations across burnout dimensions in athletes
- 2018
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Ingår i: Scandinavian Journal of Medicine and Science in Sports. - Chichester : John Wiley & Sons. - 0905-7188 .- 1600-0838. ; 28:3, s. 1215-1226
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Tidskriftsartikel (refereegranskat)abstract
- Burnout is a construct that has garnered considerable attention in sport psychology within recent years. Several hypothesized models regarding how the three dimensions (exhaustion, devaluation, and reduced sense of accomplishment) temporally relate to each other have been advanced. One proposal outlined by Maslach and Leiter suggests that exhaustion predicts devaluation which predicts reduced sense of accomplishment. However, there is no consensus among researchers as it has been argued that exhaustion predicts devaluation and reduced accomplishment separately. The aim of this study was to test multiple alternative hypotheses regarding the relationships of the burnout dimensions in athletes. Two samples of Swedish youth elite athletes with differing time spans between measurements were used. Specifically, one sample involved time-intensive measures collected every week over an eight-week period, and the other sample included four measurement points across an 18-month period. Results showed that none of the previously proposed models outlining the temporal relations of burnout dimensions were supported. Statistical analysis of the models including the cross-lagged predictions of dimensions did not have any statistically significant impact except when exhaustion negatively predicted devaluation between time 1 (month 0) and time 2 (month 6) in the 18-month sample; this relation faded in the following time points. Further, issues regarding the stability of devaluation and reduced sense of accomplishment emerged as their autocorrelation were very weak in the time-intensive sample. These findings raise a number of points for further theoretical and practical discussions about the athlete burnout construct.
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| 34. |
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| 35. |
- Lundkvist, Erik, 1978-, et al.
(författare)
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Workaholism, home-work/work-home interference, and exhaustion among sport coaches
- 2016
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Ingår i: Journal of Clinical Sport Psychology. - : Human Kinetics. - 1932-9261 .- 1932-927X. ; 10:3, s. 222-236
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Tidskriftsartikel (refereegranskat)abstract
- The aims of this study were to (a) examine the associations between workaholismand work-related exhaustion and (b) examine associations between work–home/home–work interference and work-related exhaustion in 261 Swedish coaches.Quantile regression showed that workaholism is only associated with exhaustionfor coaches who score high on exhaustion, that negative work–home interferencehas a stronger association with exhaustion than negative home–work interference,and that the coaches on a mean level scored low on all measured constructs. Inaddition, coaches in the higher percentiles have a higher risk for burnout. Ourresults highlight the importance of studying coach exhaustion with respect toaspects that extend beyond the sports life.
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| 36. |
- Mousavi Nik, Samira, 1980, et al.
(författare)
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Correlation between Al grain size, grain boundary grooves and local variations in oxide barrier thickness of Al/AlOx/Al tunnel junctions by transmission electron microscopy
- 2016
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Ingår i: SpringerPlus. - : Springer Science and Business Media LLC. - 2193-1801. ; 5:1, s. 1067-
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Tidskriftsartikel (refereegranskat)abstract
- A thickness variation of only one Ångström makes a significant difference in the current through a tunnel junction due to the exponential thickness dependence of the current. It is thus important to achieve a uniform thickness along the barrier to enhance, for example, the sensitivity and speed of single electron transistors based on the tunnel junctions. Here, we have observed that grooves at Al grain boundaries are associated with a local increase of tunnel barrier thickness. The uniformity of the barrier thickness along the tunnel junction thus increases with increasing Al grain size. We have studied the effect of oxidation time, partial oxygen pressure and also temperature during film growth on the grain size. The implications are that the uniformity improves with higher temperature during film growth.
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| 37. |
- Podlog, Leslie, et al.
(författare)
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Need satisfaction, motivation, and engagement among high-performance youth athletes : A multiple mediation analysis
- 2015
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Ingår i: International Journal of Sport and Exercise Psychology. - : Routledge. - 1612-197X .- 1557-251X. ; 13:4, s. 415-433
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of this investigation was to examine whether the various types of motivation articulated in self-determination theory (SDT) mediated the relationship between basic need satisfaction (i.e. competence, autonomy, and relatedness) and athlete engagement. Four types of motivation as assessed by the Situational Motivation Scale including intrinsic motivation, identified regulation, external regulation, and amotivation were examined as mediators of the need satisfaction–engagement relationship. Swedish downhill skiers (N = 192; n = 95 males, n = 97 females) aged 15–20 years completed questionnaires assessing the study variables of interest. Mediation analyses revealed that all four motivational regulations were significant partial mediators of the relationship between autonomy support and engagement. Moreover, except for external regulation, all three motivational regulations fully mediated the association between relatedness and engagement. Finally, intrinsic motivation and identified regulation partially mediated the relationship between competence and engagement. Findings support SDT contentions highlighting the importance of self-determined forms of motivation in mediating need satisfaction and engagement. The mediation patterns and directions for future research are discussed.
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| 38. |
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| 39. |
- Røynesdal, Øystein, et al.
(författare)
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Understanding players' transition from youth to senior professional football environments : A coach perspective
- 2018
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Ingår i: International journal of sports science & coaching. - : Sage Publications. - 1747-9541 .- 2048-397X. ; 13:1, s. 26-37
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to explore: (a) sociocultural features of a first team environment perceived to influence a player's progression, (b) the ways in which young players should manage these features and (c) how coaches operate to assist young players during specific phases in the youth-to-senior transition. Semi-structured interviews with eight elite development coaches in English Premier League football clubs generated two higher order categories: fitting in with standards of first team environment (e.g. handling social dynamics in the first team group) and facilitating shared perception of transition across key stakeholders (e.g. communicating with first team staff). Together, these findings indicate the need for young players to navigate between conforming, adapting to and breaking with specific features of the first team environment to successfully progress in the youth-to-senior transition to professional football.
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| 40. |
- Sundbom, Per, 1981-
(författare)
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Acoustic and afterload evaluation of left ventricular assist devices
- 2019
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Background: Heart Failure is a serious condition with consequences not only for the individual patient but also for the society with a 5-year mortality rate of 45-60%, and a substantial economic burden. The estimated prevalence in Sweden is 2.2% and the age adjusted prevalence increases with higher age. The fundamental treatment for heart failure is pharmaceutical in combination with life-style changes, and physiotherapy. For patients with advanced heart failure, the use of long-term circulatory support can be an option as a bridge to transplantation, or as destination therapy. However, this treatment entails a risk of multiple adverse events. The incidence of pump thrombosis increased as a clinical problem in 2012 and the need for diagnostic methods were desired. The aim of this thesis was to develop and to evaluate the use of a mock loop circuit to study the acoustics of left ventricular assist devices, to evaluate different recording devices and to study the effect of afterload on pump function.Methods: Two different mock loops, with the possibility to insert artificial thrombus and to adjust preload and afterload were created to facilitate recording of the left ventricular assist devices. An iPhone/iPodTM was used as recording device since remote monitoring is desirable. The sounds from HeartMate IITM during different conditions were studied. The iPhone/iPod was evaluated in comparison to dedicated recording equipment, and the mock loop recordings to clinical situation. The sound from HeartMate 3TM was studied, compared between in vivo and in vitro recordings, and the use of an electronic stethoscope was evaluated. The impact of afterload on left ventricular assist devices was studied in a mock loop circuit with different changes in preload and afterload.Results: Mock loop circuit is a promising method to safely change the surrounding conditions as the pump is working. The sound from both HeartMate IITM and HeartMate 3TM can be recorded and analyzed in frequency and time domain. When inserting artificial thrombus in a HeartMate IITM the frequency spectrum is altered. The use of dedicated recording devices is superior to both electronic stethoscope and iPhone/iPodTM, but these handheld devices can be used in clinical settings. The recordings from mock loop circuit and patients appear similar for both HeartMate IITM and HeartMate 3TM. The flow of the devices is affected by the afterload. The HeartMate 3TM is more resistant to increased clot analogs within the pump. For both pumps, best efficacy is seen for clean circuits. The flow rate from the monitor might be misleading since the measured flow rate and the flow rate from monitor can differ due to surrounding conditions. The estimated flow might be adjusted by fitting a parabolic curve.Conclusion: The use of mock loop circuit to study both flow and sound under different conditions is valid. It is possible to record and study the sound from both HeartMate IITM and HeartMate 3TM. The sound holds information of pump function and appears similar in vivo and in vitro. All recording devices can be used, but dedicated equipment is superior to the more handheld devices, although these might have a function as a screening device. The flow measurement on the monitor might not be valid and optimization of fluid status and afterload can further increase pump efficiency.
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| 41. |
- Sundbom, Per, 1981-, et al.
(författare)
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Sound analysis of the magnetically levitated left ventricular assist device HeartMate 3™
- 2019
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Ingår i: International Journal of Artificial Organs. - : Sagamore Publishing. - 0391-3988 .- 1724-6040. ; 42:12, s. 717-724
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Tidskriftsartikel (refereegranskat)abstract
- INTRODUCTION: The HeartMate 3™ has shown lower rates of adverse events compared to previous devices due to the design and absence of mechanical bearings. For previous devices, sound analysis emerged as a way to assess pump function. The aims of this study were to determine if sound analysis can be applied to the HeartMate 3 in vivo and in vitro and to evaluate an electronic stethoscope.METHOD: Sound recordings were performed with microphones and clinical accessible electronic stethoscope. The recordings were studied in both the time and the frequency domains. Recordings from four patients were performed to determine if in vivo and in vitro recordings are comparable.RESULTS: The results show that it is possible to detect sound from HeartMate 3 and the sound spectrum is clear. Pump frequency and frequency of the pulsatile mode are easily determined. Frequency spectra from in vitro and in vivo recordings have the same pattern, and the major proportion (96.7%) of signal power is located at the pump speed frequency ±40 Hz. The recordings from the patients show low inter-individual differences except from location of peaks originating from pump speed and harmonics. Electronic stethoscopes could be used for sound recordings, but the dedicated equipment showed a clearer sound spectrum.DISCUSSION: The results show that acoustic analysis can also be performed with the HeartMate 3 and that in vivo and in vitro sound spectrum is similar. The frequency spectra are different from previous devices, and methods for assessing pump function or thrombosis need further evaluation.
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| 42. |
- Wagnsson, Stefan, Docent, 1969-, et al.
(författare)
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Värmländska barn i rörelse
- 2015
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Ingår i: Barns liv och hälsa i Värmland 2014. - Karlstad : Karlstads universitet. - 9789170636288 ; , s. 108-115
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- EN KLAR MAJORITET (93 procent) av de värmländska barnen (12-16 år) är regelbundet fysiskt aktiva under en eller flera dagar i veckan.BARA DRYGT HÄLFTEN uppnår den rekommenderade dagliga dosen (60 minuter) av fysisk aktivitet under veckans samtliga dagar.ÖVERVÄGANDE DELEN (70 procent) är aktiva i någon föreningsidrott.EN STOR ANDEL (69 procent) idrottar spontant på fritiden någon eller några gånger i veckan. DE ALLRA FLESTA (91 procent) värmländska barn deltar regelbundet på idrottslektionerna.ENDAST 1 PROCENT av de värmländska barnen kan klassas som helt fysiskt inaktiva.DET FÖRELIGGER INGA större könsskillnader i fysisk aktivitetsgrad, däremot minskar aktivitetsgraden med åldern.VÄRMLÄNDSKA BARNS fysiska aktivitetsvanor liknar de från övriga delar av landet.
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