Diurnal variation in cycling performance: Influence of warm-up
Diurnal variation in cycling performance: Influence of warm-up
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DOI：
10.1080/02640410410001729919
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发表时间：
2005-03-01
影响因子：
3.4
通讯作者：
Waterhouse, J
中科院分区：
文献类型：
--
作者：
Atkinson, G;Todd, C;Waterhouse, J
我们研究了一天中的时间对有和没有长时间热身的自行车计时赛的影响，其中包括那些倾向于“早晨”的自行车手。8名男性自行车运动员（平均+/- s：年龄= 24.9 +/- 3.5岁，峰值功率输出= 319 +/- 34 W，生理时钟类型= 39 +/- 6个单位）在07：30和17：30完成了16.1公里的计时赛，没有进行大量的热身。在60%的峰值功率下预热25分钟后，也在一天的两个时间完成计时试验。在整个时间试验中测量功率输出、心率、耳内温度和感知用力等级（CR-10）。还记录了试验后的血乳酸浓度。热身通常改善了一天中两个时间点的计时试验性能（改善的95% CI = 0至30 s），但热身后07：30 h的平均骑行时间仍显著低于17：30 h（差异的95% CI = 33至66 s）。耳内温度随着计时赛的进行而升高（P < 0.0005），并且在整个计时赛中在17：30时显著更高（P = 0.001），无论骑自行车者是否进行热身。在没有热身的情况下，时间试验后的血乳酸浓度在07：30 h最低（P = 0.02）。在时间试验期间，未发现一天中的时间或热身对CR-10或心率反应的影响。这些结果表明，即使运动员倾向于“早晨”并进行25分钟的激烈热身，上午的16.1公里自行车成绩也比下午差。因此，自行车性能的昼夜变化对一些外部和行为因素相对稳健。
We examined the effects of time of day on a cycling time trial with and without a prolonged warm-up, among cyclists who tended towards being high in "morningness". Eight male cyclists (mean +/- s: age = 24.9 +/- 3.5 years, peak power output = 319 +/- 34 W, chronotype = 39 +/- 6 units) completed a 16.1-km time trial without a substantial warm-up at both 07:30 and 17:30 h. The time trial was also completed at both times of day after a 25-min warm-up at 60% of peak power. Power output, heart rate, intra-aural temperature and category ratings of perceived exertion (CR-10) were measured throughout the time trial. Post-test blood lactate concentration was also recorded. Warm-up generally improved time trial performance at both times of day (95% CI for improvement = 0 to 30 s), but mean cycling time was still significantly slower at 07:30 h than at 17:30 h after the warm-up (95% Cl for difference = 33 to 66 s). Intra-aural temperature increased as the time trial progressed (P < 0.0005) and was significantly higher throughout the time trials at 17:30 h (P = 0.001), irrespective of whether the cyclists performed a warm-up or not. Blood lactate concentration after the time trial was lowest at 07:30 h without a warm-up (P = 0.02). No effects of time of day or warm-up were found for CR-10 or heart rate responses during the time trial. These results suggest that 16.1-km cycling performance is worse in the morning than in the afternoon, even with athletes who tend towards 'morningness', and who perform a vigorous 25-min warm-up. Diurnal variation in cycling performance is, therefore, relatively robust to some external and behavioural factors.