Sports performance: is there evidence that the body clock plays a role?

Abstract

Athletic performance shows a time-of-day effect, possible causes for which are environmental factors (which can be removed in laboratory studies), the sleep-wake cycle and the internal "body clock". The evidence currently available does not enable the roles of these last two factors to be separated. Even so, results indicate that the body clock probably does play some role in generating rhythms in sports performance, and that to deny this is unduly critical. Protocols to assess the separate roles of the body clock and time awake are then outlined. A serious impediment to experimental work is muscle fatigue, when maximal or sustained muscle exertion is required. Dealing with this problem can involve unacceptably prolonged protocols but alternatives which stress dexterity and eye-hand co-ordination exist, and these are directly relevant to many sports (shooting, for example). The review concludes with suggestions regarding the future value to sports physiology of chronobiological studies.

Stress, Sleep and Recovery in Elite Soccer: A Critical Review of the Literature

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“…These include poor sleep, fatigue, gastrointestinal disturbance, and impaired motor performance. To discern the role of circadian alignment under natural conditions in humans, researchers have examined the effects of jet lag on athletic performance and have found effects on broad aggregate performance parameters such as winning percentage or total points scored (4)(5)(6)(7)(8)(9)(10)(11). It has been widely assumed that jet lag impacts a broad range of parameters under a wide variety of conditions.…”

Effect of high wavelengths low intensity light during dark period on physical exercise performance, biochemical and haematological parameters of swimming rats

“…Despite lack of consensus, a common point raised over the years is the presence of confounding effects that disturb experimental control in human model investigations involving exercise chronobiology (12,17,32,41). In summary, confounding effects comprise social, nutritional, motivational and time-awake variations, masking the real chronobiological phenomena.…”

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