Abstract Diurnal, ultradian, and circadian rhythms tend to govern the secretion patterns of hormones. Since few hormonal responses are truly circadian (regulated by no external stimulus) in nature, several factors such as sleep-wake cycles, nutrition, meal timing, exercise, other hormones, and stress can alter diurnal (daily) rhythm patterns. It is precisely for this reason that competitive and recreational athletes and their coaches should be aware […]
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