Thus, the diurnal variation in cardiovascular endurance performance is still unclear. However, most studies ( 6- 10) indicated that the VO 2max is a stable function, which is not altered by diurnal changes. ( 3) found that VO 2max is significantly greater in the morning, but other studies found that greater VO 2max performance is achieved in the afternoon ( 4, 5). Previous findings of diurnal effect on maximal oxygen uptake (VO 2max) were not reached to the consensus. Many researchers have investigated in the diurnal effect on endurance activities since 1980s ( Table 1). Regarding circadian effect on aerobic exercise and maximal oxygen uptake (VO 2max) shown in Chtourou et al. By the same token, the body-clock is believed to be a factor affecting sports performance. These responses are related to the circadian rhythm (i.e. Backgroundīody responses are varied from time to time in a day due to specific body conditions such as wakefulness, hunger, jet lag, etc. Secondary school students or young athletes are recommended to have sports training related to VO 2max at noon for the purpose of maximizing training effectiveness.Ĭircadian Rhythm Aerobic Exercise Diurnal Effect Oxygen Athlete Students 1. Diurnal effect on endurance performance was found and the highest exercise VO 2max was identified at noon.
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