Circadian variation in swim performance
Circadian variation in swim performance
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DOI：
10.1152/japplphysiol.00910.2006
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发表时间：
2007-02-01
影响因子：
3.3
通讯作者：
Youngstedt, Shawn D.
中科院分区：
文献类型：
--
作者：
Kline, Christopher E.;Durstine, J. Larry;Youngstedt, Shawn D.
先前发现的运动表现的时间差异可能会被环境和行为“掩蔽”因素的昼夜波动所混淆。例如，在一个实施例中，睡眠、环境温度和能量摄入）。本研究的目的是检查是否有一个昼夜节律在游泳的表现是独立于这些掩蔽因素。有经验的游泳者（n = 25）在实验室中连续50-55小时进行评估。游泳者遵循3小时的“超短”睡眠-觉醒周期，包括1小时的黑暗睡眠和2小时的昏暗光线下的觉醒，在整个观察过程中重复。该方案在24小时内平均分配行为和环境掩蔽因子。每个游泳运动员被安排进行6次最大努力200米游泳试验，平均分布在一天的8个时间（n = 147试验）。每次试验间隔9 h。耳内温度数据的余弦拟合建立了最低体温的时间（T-min）。对游泳成绩进行z转换，并在一天中的8个时间段和12个2小时间隔内相对于T-min进行比较。控制试验次数的协方差分析显示，游泳成绩相对于一天中的环境和昼夜节律时间具有显著性（P < 0.001）。T-min前5-7小时性能达到峰值（类似于2300），从T-min前1小时到T-min后1小时最差（类似于0500）。平均游泳成绩为169.5秒;从最高成绩到最差成绩的昼夜变化为5.8秒。这些数据表明，在运动表现的昼夜节律独立的环境和行为掩蔽效应。
Previous findings of time-of-day differences in athletic performance could be confounded by diurnal fluctuations in environmental and behavioral "masking" factors ( e. g., sleep, ambient temperature, and energy intake). The purpose of this study was to examine whether there is a circadian rhythm in swim performance that is independent of these masking factors. Experienced swimmers (n = 25) were assessed for 50-55 consecutive hours in the laboratory. The swimmers followed a 3-h "ultra-short" sleep-wake cycle, involving 1 h of sleep in darkness and 2 h of wakefulness in dim light, that was repeated throughout the observation. The protocol distributes behavioral and environmental masking factors equally across the 24-h period. Each swimmer was scheduled to perform six maximal-effort 200-m swim trials that were distributed equally across eight times of day (n = 147 trials). Each trial was separated by 9 h. A cosine fit of intra-aural temperature data established the time of the lowest body temperature (T-min). Swim performances were z-transformed and compared across the eight times of day and across twelve 2-h intervals relative to T-min. Analysis of covariance, controlling for trial number, revealed a significant (P < 0.001) pattern in swim performance relative to environmental and circadian times of day. Performance peaked 5-7 h before T-min (similar to 2300) and was worst from 1 h before to 1 h after T-min (similar to 0500). Mean swim performance was 169.5 s; circadian variation from peak to worst performance was 5.8 s. These data suggest a circadian rhythm in athletic performance independent of environmental and behavioral masking effects.