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  • Pagaduan, Jeffrey, et al. (författare)
  • Accuracy and reliability of a free mobile HRV application in measurement of heart rate variability
  • 2019
  • Ingår i: Journal of Human Sport and Exercise. - : University of Alicante, Spain. - 1988-5202 .- 1988-5202. ; 14:Supplement: Proc4, s. S578-S583
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: This study aimed to investigate the accuracy and reliability of a free mobile heart rate variability (HRV) application in measuring HRV. Methods: Twelve females and 12 males underwent five-minute simultaneous HRV recording from electrocardiogram (ECG) and chest strap connected to a free mobile HRV application (HRVapp) in a supine position. HRV data from ECG and HRVapp were used to examine accuracy and reliability via relative error and intraclass correlation coefficient respectively. Results: The natural log of the square root of the mean of the sum of the squares of differences between adjacent normal to normal intervals (lnRMSSD) exhibited accuracy and high reliability in HRVapp. Conclusion: lnRMSSD in HRVapp can serve as an alternative, low-cost technology for measurement of autonomic activity.
  • Pantzar, Alexandra, et al. (författare)
  • Relationships Between Aerobic Fitness Levels and Cognitive Performance in Swedish Office Workers
  • 2018
  • Ingår i: Frontiers in Psychology. - : Frontiers. - 1664-1078 .- 1664-1078. ; 9
  • Tidskriftsartikel (refereegranskat)abstract
    • Objectives: Aerobic exercise influence cognition in elderly, children, and neuropsychiatric populations. Less is known about the influence of aerobic exercise in healthy samples (particularly working age), and of different fitness levels on cognition. Two hypotheses were posed: 1) low fitness levels, compared to moderate and high, will be related to poorer cognitive performance, and 2) breakpoints for the beneficial relationship between VO2 and cognition will be observed within the moderate-to-high fitness span. Design and Methods: The sample consisted of n=362 office workers. A submaximal cycle ergometer test estimated maximal oxygen consumption (VO2max, mL•kg-1•min-1). Based on estimated VO2max participants were split into tertiles; low (n=121), moderate (n=119), and high (n=122). A cognitive test battery (9 tests), assessed processing speed, working memory, executive functions and episodic memory. Results: Both hypotheses were confirmed. Groups of moderate (≈40) and high (≈49) fitness outperformed the group of low (≈31) fitness for inhibition and episodic recognition, whereas no significant differences between moderate and high fitness were observed (ANCOVAs). Breakpoints between benefits fromVO2max for inhibition and recognition were estimated to ≈44/43 mL•kg-1•min-1 (multivariate broken line regressions). Conclusions: Results suggest that it is conceivable to expect a beneficial relationship between VO2max and some cognitive domains up to a certain fitness level. In a sample of healthy office workers, this level was estimated to 44 mL•kg-1•min-1. This has implications on organizational and societal levels; where incentives to improve fitness levels from low to moderate could yield desirable cognitive and health benefits in adults.
  • Sjödin, Fredrik, 1978-, et al. (författare)
  • Noise Exposure and Hearing Related Risks for Technical Officials during a Major Badminton Tournament
  • 2018
  • Ingår i: Jacobs Journal of Physical Rehabilitation Medicine. - Austin : Jacobs Publishers. - 2469-3103. ; 4:1, s. 1-11
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective: The aim of the study was to investigate the noise exposure for different technical officials during a major badminton tournament.Methods: Individual noise exposure for technical officials was measured during the 23rd BWF World Championship, 2017 in Glasgow, Scotland during all days of the tournament.Results: Umpires and on-court-doctors had equivalent noise exposure, when working longer shifts, that exceeded the exposure limit according to the EU 2003/10/EC noise directive. Exposure limits regarding impulse sound was also exceeded during several work shifts during the tournament.Conclusions: Technical officials are exposed to noise levels that exceed current occupational health leg-islation within the EU, and may therefore be at risk of developing hearing related disorders. It is of high importance for the organizers of sports events to reduce the noise exposure for the technical officials by scheduling shorter work periods, but also by providing individual hearing protectors.
  • Sjöström, Rita, et al. (författare)
  • Qualitative identification and characterisation of self-reported symptoms arising in humans during experimental exposure to cold air
  • 2019
  • Ingår i: International Journal of Circumpolar Health. - : Taylor & Francis. - 2242-3982 .- 2242-3982 .- 1239-9736. ; 78:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Exposure to cold air is associated with increased morbidity and mortality in the general population. It is difficult to study the effects of whole-body exposure to cold air under controlled conditions in real life. Objectives: The aim of this study was to (1) explore and describe the experience of symptoms in humans during experimental and controlled exposures to cold air, by using controlled environmental chamber exposures and qualitative methodology, and to (2) categorise the symptoms. Method: The study used a randomised, double blind design, in which 34 subjects undertook rest and moderate-intensity exercise in an environmental chamber set to two or three different temperatures (0, −10, and −17°C) on separate occasions. During the chamber exposures, subjects were interviewed. Qualitative content analysis was selected as the method of analysis. Findings: Subjects reported 50 distinct symptoms during the exposures. The symptoms were grouped into ten sub-categories and two major categories; airway versus whole-body symptoms. Conclusion: We have identified a broad range of symptoms in humans undertaking rest and moderate-intensity exercise at sub-zero temperatures. The symptoms and their categories may well be used to more extensively and quantitatively map cold-induced morbidity.
  • Ahmadi, Nader, et al. (författare)
  • Introduction : Doping and Public Health
  • 2016. - 1
  • Ingår i: Doping and Public Health. - Abingdon : Routledge. - 9781138918559 - 9781317421108 - 9781315688428 ; , s. 1-10
  • Bokkapitel (refereegranskat)abstract
    • The concept of “doping” is usually associated with sport, particularly elite sport. In fact, doping means the use of substances or methods that are banned in sport by the World Anti-Doping Agency (WADA) because of their potentially performance-enhancing effects. Their use is, therefore, considered to be against the fair play spirit of sport and can also include significant health risks for the user. However, the use of many doping substances is no longer limited to the world of sport. Doping substances such as anabolic androgenic steroids (AAS) are nowadays used also by people who are not competitive athletes but who want to make use of the effects of AAS in making their bodies more muscular, stronger and impressive in conformity with the current masculine body ideal. The use of AAS and similar substances appears to be growing and has been found in a range of countries previously not researched. At least, recent data obtained from customs seizures, court cases and some surveys suggest that the extent of AAS use outside sport has been underestimated, some reasons probably being an underground circulation of such drugs in the gym and fitness culture and the easy availability of them on the internet. One particular concern is the increasing use of nutritional supplements by growing segments of society. A significant percentage of these products have been shown to contain prohibited substances such as steroids that are not listed on the label. This shows that the nutritional supplement industry needs to be more strictly regulated. Until that happens, supplements of dubious value, content and quality will continue to be easily available around the world. What, then, are the possible reasons that active and health-conscious individuals are willing to take the risk to use preparations such as AAS? A review of the research shows that the most important motive behind the use of AAS outside the elite sports environment, i.e., in a fitness context, is to improve physical appearance. Although most users are boys and young and middle-aged men, also women of various ages use doping substances. Different types of slimming pills are popular among women (including hormone preparations), but possibly even more interesting are the new female fitness and appearance ideals that are connected to muscles and strength. The body has become increasingly important for saying something about who we are. The hunt for the perfect appearance creates a situation where denial instead of acceptance of one’s own body influences the individual’s self-image.
  • Ahmadi, Nader, et al. (författare)
  • "The winner takes it all" : Individualization and Performance-Enhancing Drugs and Methods in Sport and in Society
  • 2016. - 1
  • Ingår i: Doping and Public Health. - Abingdon : Routledge. - 9781138918559 - 9781315688428 ; , s. 38-48
  • Bokkapitel (refereegranskat)abstract
    • A common misconception in today's society is that everything is (or should be) rational and goal-oriented, which we summarized earlier as pragmatic rationalism. We call this pragmatic rationalism a misconception because it misses a historical fact that individuals' actions are and have never been governed entirely by rational motives. Emotional, ethical and existential considerations influence human actions extensively. Solidarity, willingness to share and even self-sacrifice and prioritizing the good of others before one's own are values that have survived many different economic cultures. Even today's extremely individualized society with its focus on reaching success and winning at any price cannot completely suppress these values. There is an inherent contradiction between the crude egoism of modern individualism and its historical development that largely has its origin in the care of humans.
  • Alricsson, Marie, et al. (författare)
  • Mobility, muscular strength and endurance in the cervical spine in Swedish air force pilots
  • 2001
  • Ingår i: Aviation, Space and Environmental Medicine. - 0095-6562 .- 1943-4448. ; 72:4, s. 336-342
  • Tidskriftsartikel (refereegranskat)abstract
    • PURPOSE: Muscle strength, endurance and range of movement of the cervical spine in a group of Swedish Air Force jet pilots (AF) and in a reference group of conscripts doing their military service (RG) were compared. METHODS: We tested 30 (AF) 24-42 yr and 33 (RG) 19-22 yr. A questionnaire was used to document complaints. Maximum voluntary isometric muscle strength of the flexor and extensor muscles of the cervical spine and sub-maximum isometric endurance in the flexor and extensor muscles were measured. RESULTS: Eleven AF (37%) and four RG (12%) had experienced discomfort in the neck within the previous year. The pilots' flexor and extensor muscle strength (47 Nm and 65 Nm) was superior to that of the conscripts (36 Nm and 59 Nm) (p = 0.0001, p = < 0.05, respectively). However, the RG group had greater isometric endurance in the flexor muscles than AF (p = < 0.05) and greater neck rotation (p = <0.005). There was no difference between the two groups in the other variables. CONCLUSION: Differences between the groups with regard to muscle strength and endurance might depend on variations in work-related physical muscle strain, and/or differences in fiber composition in the muscles, which might be reflected by pilot selection procedures.
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