| 41. |
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| 42. |
- Lundgren, Lina, 1982-, et al.
(författare)
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Sport performance and perceived musculoskeletal stress, pain and discomfort in kitesurfing
- 2011
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Ingår i: International Journal of Performance Analysis in Sport. - Abingdon : Taylor & Francis. - 2474-8668 .- 1474-8185. ; 11:1, s. 142-158
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of this study was to obtain an overview of the specific movement patterns in kitesurfing, and the participants' perceptions of musculoskeletal stress, pain and discomfort. Task analysis and survey studies were used to provide an overview of the sport, and to identify problematic issues associated with the performance of the tasks. Three different methods were complimentary used for data collection: observations (n=8), a web questionnaire (n=206) and interviews (n=17). Participants were contacted through kitesurfing events and online forums. Their ages ranged from 16-62 years. The results showed that participants experienced high musculoskeletal stress for short times during a session (jumps, tricks and strong winds), and lower, static musculoskeletal stress over a longer time (crossing). High stress was most frequently perceived in abdominal muscles. Knees and feet were the sites most frequently experienced as painful, followed by the shoulders and elbows. This study provides additional information on the performance of kitesurfing and perceived musculoskeletal stress, pain and discomfort. The results can be used as input data to develop training methods and equipment for safe and comfortable performance. © 2017, Routledge. All rights reserved.
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| 43. |
- Lundgren, Lina, 1982-
(författare)
-
System analysis of kitesurfing : Understanding performance and injury risk for on-water board sports
- 2011
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Board sports are examples of sports where the interaction of the task, environment and the athlete are essential. As for other sports, there are injuries and other issues associated with these sports, which affect performance and that can be avoided by proper preparation and well- designed equipment. By focusing on kitesurfing as a system structure the complex interactions between factors can help reveal which variables that are of interest to study to increase the level of performance and safety. Lack of research on the board sport kitesurfing makes this area interesting to study regarding performance and musculoskeletal problems. The purpose of this licentiate thesis was to further the understanding of on-water board sports, and specifically study kitesurfing by using a system analysis to structure factors that influence performance and injury risk for this board sport. The specific aims were:To reveal the most common self-reported injuries related to kitesurfing and their causes (Paper I).To evaluate in which body parts participants perceive musculoskeletal stress, pain and discomfort related to the performance of kitesurfing (Paper II).To identify usability problems related to the preparation of kitesurfing equipment (Paper III).To provide a system analysis to describe the relations between and identify characteristics that influence performance and injury risk of kitesurfing.Methods used for these studies were hierarchical task analysis, observations (n=8), web- questionnaires (n=206), interviews (n=17) and a focus group (n=7). The system analysis was executed in six steps and based on ideas adopted from general systems theory, dynamical systems and ecological task analysis. Tasks performed in freestyle kitesurfing consist of riding a board and performing jumps and tricks, whereof the latter have sub-tasks involving take-off, acrobatic air movements and landings. Within the system of kitesurfing, there are the sub-systems athlete, kite system, board system and harness/protection. There are also external factors acting upon the system. All sub- systems have characteristics that are less changeable during execution of the task and which effect on the athlete can be represented by identified output measures, i.e. harness line force, board reaction force, steering force, pressure distribution, movement patterns, body temperature, fatigue level, comfort and pain, choice of sub-task, mood, stress level, concentration, motivation, experience and usability. The results show that the most frequent locations for injury are in the lower extremities, i.e. knee and ankle, and that about 50% of the injuries reported were associated with jumps and tricks. Equipment and environmental factors also contribute to injuries, as well as to musculoskeletal stress, pain and discomfort. The abdominal muscles were most frequently reported as exposed to high musculoskeletal stress, but also thighs and lower back were perceived as highly stressed throughout the tasks. Knees and feet were areas described as sometimes painful, especially in combination with landings from tricks or strong winds.Furthermore, the lower back was reported painful when kitesurfing in strong winds. When hooking out from the harness for performing tricks, the shoulders were perceived as highly stressed. Before the execution of on-water kitesurfing starts, the preparation of the kite system must be accomplished. The results from Study III showed that there are usability problems related to this kitesurfing task, meaning risk for use error to arise. If use errors occur, serious consequences can follow later in the process. The results emphasize improvement of the products from a usability perspective. Some of the identified output measures were partly answered from the results of Papers I-III, where numbers of injuries, perceived musculoskeletal stress, pain and discomfort, and usability issues were evaluated for kitesurfing. The structure motives the need for further research within the area of on-water board sports and reveals variables that are affecting the system.
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| 44. |
- Malmborg, Julia, 1988-, et al.
(författare)
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Sleeping Problems and Anxiety is Associated to Chronic Multisite Musculoskeletal Pain in Swedish High School Students
- 2018
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Ingår i: Annals of the Rheumatic Diseases. - London : BMJ Publishing Group Ltd. - 0003-4967 .- 1468-2060. ; 77:Suppl. 2, s. 226-226
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Background: The relationship between chronic multisite musculoskeletal pain (CMP) and sleep is complex, where pain can lead to sleeping problems and lack of sleep can intensify the pain perception. Most previous studies relates to adults, but adolescents may also suffer from CMP, and there is a need for more knowledge regarding the relationships between CMP and sleeping problems, stress, anxiety, depression, and health status.Objectives: To study background factors associated to CMP in first year Swedish high school students.Methods: First year Swedish high school students (n=296) were invited to complete questionnaires on chronic pain (mannequin with 18 body regions), sleeping problems (Uppsala Sleep Inventory, four items scored from 1–5), stress (ELO questions, scored from 1–5), anxiety and depression (Hospital Anxiety and Depression Scale, scored from 0–21), health status (EQ-5D, scored from 0 to 1, worst to best) and physical activity (International Physical Activity Questionnaire, categorised into low, moderate and high levels). Stress and sleeping items were dichotomized into 1–3 points (best) vs 4–5 points (worst). Individuals scoring at least severe problems (4 points) at one or more sleeping items were classified as having severe sleeping problems. HADS were categorised as non-cases (0–7), possible7–10 and probable cases (11–21 points). Students were grouped as having CMP (pain present in ≥3 regions) or not (no chronic pain or chronic pain in 1–2 regions). Multiple logistic regression analyses (adjusted for sex) with CMP as dependent variable were performed in SPSS, version 24.Results: 254 students (86% of total sample, 87 boys and 167 girls) with a mean age of 16.1 (SD 0.6) years participated in the study. CMP was present in 25 (9.8%) students with no differences between boys and girls (8.0% vs 10.8%; p=0.488). Having CMP was associated with reporting severe sleeping problems (OR 2.49, 95% CI: 1.06 to 5.81, p=0.035) with initiating sleep, maintaining sleep, early morning awakenings and/or not feeling restored after sleep in comparison to the other students. Students with CMP were more likely to be categorised as probable cases for anxiety (OR 3.06, 95% CI: 1.09 to 8.61, p=0.034), but there were no associations for possible cases for anxiety (OR 1.15, 95% CI: 0.38 to 3.51, p=0.800), possible cases (OR 2.03, 95% CI: 0.63 to 6.54), or probable cases for depression (OR 3.35, 95% CI: 0.33 to 33.83). There was a nearly significant association between stress and belonging to the CMP group (OR 2.31, 95% CI: 0.97 to 5.53, p=0.059). A higher self-reported health status was associated to a lower likelihood for CMP (OR 0.04, 95% CI: 0.01 to 0.27, p=0.001). Distribution of physical activity levels of low, moderate and high was not significantly associated to having CMP in comparison with not having it.Conclusions: One in ten high school students fulfilled criteria for having chronic multisite musculoskeletal pain. CMP was associated to sleeping problems, anxiety, and a worse health status. The results from this study may be used by school health-care professionals in their preventive work to promote student’s health.Disclosure of Interest: None declared
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| 45. |
- Parker, James, 1980-, et al.
(författare)
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A One Year Study on Changes in Flexibility and Stability Characteristics in Elite Golfers
- 2011
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The results from this study show that training strategies can lead to improved flexibility and stability in golfers during the off season, however maintaining these improvements, particularly flexibility, during the in-season is not as easy. Decreased flexibility on the left side leads to reduced ROM to manage deceleration of forces produced in the golf swing that probably lead to an increased risk of injury. Significant improvements can be made after no more than 3 months of training, including flexibility and stability training. Technique training may be more successful if it follows a period of concentrated physical training. During the in-season, emphasis ought to be on maintaining ROM by effective implementation of stretching programs.
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| 46. |
- Röijezon, Ulrik, et al.
(författare)
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Handens sensomotoriska funktion
- 2019. - 1
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Ingår i: Motorisk kontroll och inlärning. - Lund : Studentlitteratur AB. - 9789144074177 ; , s. 91-106
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Handen med alla dess mångfasetterade funktioner har central betydelse för människors vardagsaktiviteter, både i hemmet, i yrkesarbetet och på fritiden. Genom sin unika konstruktion, med bland annat opposition av tummen mot övriga fingrar möjliggörs ett flertal olika grepp och ändamålsenlig manipulation. Handen är även viktig för vår uppfattning om vår omvärld samt för vårt kroppsspråk och vår kommunikation. Handens särställning vad gäller såväl sensorisk som motorisk funktion exemplifieras av den relativt sett stora representation som handen har i såväl sensoriska som motoriska kortex. I detta kapitel presenteras handens funktionella anatomi och sensomotoriska funktioner.
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| 47. |
- Röijezon, Ulrik, et al.
(författare)
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Projekt: Rörelsekontroll och effektivitet vid flugkastning
- 2012
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Annan publikation (populärvet., debatt m.m.)abstract
- I samarbete med Svenska Castingförbundet och Dala Sports Academy (DSA) vid Högskolan i Dalarna har ett forskningsprojekt kring effektivitet, rörelsekontroll och motorisk inlärning vid flugkastning påbörjats. Samarbetspartner vid DSA är bl.a. adjunkt Anders Henriksson, Professor Michail Tonkonogi och forskaren Sofia Brorsson.
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| 48. |
- Sundström, Tomas, et al.
(författare)
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Five Weeks of Plyometric Training Improve Vertical Jump Height in Female Handball Players During In-Season
- 2010
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Ingår i: Nordic Conference 2010. - Odense : University of Southern Denmark. ; , s. 112-113
-
Konferensbidrag (refereegranskat)abstract
- Introduction: Handball is a sport requiring many different physical qualities in order to perform well, one of which is good jumping ability. For handball players available time to enhance power during in-season is often restricted due to an already high training load emphasizing other aspects of the sport than jumping ability. Therefore, one aim of this study was to examine if a small amount of additional plyometric training during in-season, combining drop jumps and box jumps, could give significant improvements in vertical jump height in female handball players after five weeks of training. Generally, vertical jump height is evaluated with two-legged tests, however, the question arises if the tests are relevant in sports that predominantly use several steps and one-leg jumps such as handball. A second aim of this study was thus to develop, evaluate and validate a handball-specific test performed on one leg.Methods: Two Swedish female handball-teams playing in the third division were recruited. Players from one team made up the intervention-group (n = 9) and players from the other team functioned as the control-group (n = 4). Plyometric training was added to the regular handball training session twice per week during five weeks, lasting approximately 15 minutes per session, consisting of two sets of eight repetitions of drop jumps and box jumps respectively, while the control-group continued their training as normal. Jumping performance was evaluated through the squat jump test (SJ), countermovement jump test (CMJ) and the handball-specific one leg jump test (OLJ) developed for this study in order to offer a more sport-specific evaluation tool when testing sports that predominantely jump on one leg.Results: The intervention-group improved their jumping height significantly with 2,7 cm in the SJ, 3,6cm in the CMJ and 3,6 cm in the OLJ (p < 0,01 for all). The control-group had an opposite trend with diminishing results in all three jumps, -1,5 cm in the SJ (p < 0,05), -1,7 cm in the CMJ (p < 0,05) and -0,9 cm in the OLJ (not significant). The one-legged jump test (OLJ) correlated well with both SJ (r= 0,79, p <0,01 ), and CMJ (r=0,75, p < 0,01).Discussion: The present study found significant improvements in jumping height after only five weeks of plyometric training for female handball players. Interestingly, the intervention-group improved to the same extent in both the one and the two-leg jumps test, which might be explained by the accumulation of handball specific training drills performed on one-leg, together with the two-legged plyometric exercises. The same assumption could also explain why the control-group showed no change in the one-leg jump test between the pre and post-tests, but displayed significant lower scores in the two-legged jumping tests after 5 weeks with only regular handball training.Conclusion: The improvements seen in this study with a small amount of additional plyometric training is relevant for coaches that need to provide gains in jumping performance during in-season when there is not a lot of time for additional training. Moreover, an evaluation test needs to be as specific as possible to the performance in the sport. The one-leg vertical jump test, developed in this study, could be a first step to a future handball-test that better resembles the jumping performance in handball than already established two-leg jumping tests.
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