Olympic Swim Performance Depends on Time-Of-Day (IMAGE)
Caption
Olympic swim performance depends on time-of-day. Residual variation of individually normalized data of heats, semi-finals and finals (corrected for intercept, type of race, Olympic venue, and individual differences, as quantified by a linear mixed model) was fitted by a 24-h period sine function and plotted against local time at the Olympic venue location (h). Data represent mean ±SEM. Black dots indicate average finish times in 3-h bins. A sine fit (period=24 h, black curve) describes variation in swim performance over the day. It indicates the worst performance in the early morning and best performance in the late afternoon (dotted lines).
Credit
Renske Lok / University of Groningen
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