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标题：Acute short-term dim light exposure can lower muscle strength endurance
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作者：Arnold G. Nelson ; Joke Kokkonen ; Megan Mickenberg 等
期刊名称：Journal of Sport and Health Science
印刷版ISSN：2095-2546
出版年度：2015
卷号：4
期号：3
页码：270-274
DOI：10.1016/j.jshs.2014.04.007
出版社：Elsevier
摘要：Background: Since it has been shown that spending 18 h under dim light conditions can result in reduced handgrip endurance, it was questioned whether or not a shorter exposure to dim light (i.e., 1 h) would have similar influence upon muscular endurance. Therefore this study compared the number of weighted knee extension lifts that could be done after spending 1 h in either dim or bright light. Methods: Participants (5 women, 11 men, college students 19-26 years) performed knee extension lifts to exhaustion with a load approximating 40% of their body weight. The lifts to exhaustion were measured immediately following 1 h of exposure to each of the following three conditions: dark (DL), room light (RL), and room light plus 5 mg melatonin (RLM). A minimum of 48 h separated each condition, and all participants started the exposures in a rested fed condition. Results: Average (+/-SD) number of knee extension lifts for RL (62.0 +/- 22.0) was significantly (p < 0.05) greater than DL (51.4 +/- 14.7) and RLM (57.8 +/- 22.9). The number of RLM knee extension lifts was not significantly different from DL. Exposure to 1 h of dim light immediately prior to activity can result in a reduction in thigh muscle endurance. The decline in performance to short-term dim light exposure was similar to that found following longer-term exposure. Conclusion: It appears that light intensity can influence muscle endurance, however, at this time this effect cannot be directly related to endogenous melatonin production.
关键词：Blood glucose; Blood pressure; Heart rate; Knee extension endurance; Light intensity; Melatonin