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Seasonal Variations in Health-Related Human Physical Activity

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Abstract

There are profound fluctuations in climate that occur within the annual cycle of seasonal changes. The severity of these changes depends on latitude of location and prevailing topography. Living creatures have evolved means of coping with seasonal extremes. Endogenous circannual cycles, at least in humans, appear to have been masked by mechanisms employed to cope with environmental changes. Physical activity levels tend to be lower in winter than in summer, mediating effects on health-related fitness. In athletes, seasonal changes are dictated by requirements of the annual programme of competitive engagements rather than an inherent circannual rhythm. Injury rates are influenced by seasonal environmental factors, notably in field sports. Season of birth has been related to susceptibility to selected morbidities, including mental ill-health. In age-restricted sports, there is a date-of-birth bias favouring those individuals born early in the competitive year. Trainers and selectors should acknowledge this trend if they are to avoid omitting gifted individuals, born later in the year, from talent development programmes.

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Acknowledgements

This article was undertaken without any external sponsorship and none of the authors had any conflict of interest when preparing the article. The authors acknowledge the help of Professor Greg Atkinson in commenting on an initial draft of the article.

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Correspondence to Thomas Reilly.

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Reilly, T., Peiser, B. Seasonal Variations in Health-Related Human Physical Activity. Sports Med 36, 473–485 (2006). https://doi.org/10.2165/00007256-200636060-00002

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