目的:研究橄榄球联盟运动员在晚上比赛前一天晚上和之后的睡眠情况,并研究咖啡因摄入量与比赛当晚睡眠之间的关系。
方法:在前一天晚上,晚上,在职业橄榄球联赛的晚上,15名运动员使用手腕活动监测器监测他们的睡眠。此外,在比赛前60分钟和比赛后30分钟收集唾液样本,以评估唾液咖啡因浓度.使用线性混合模型检查了三个晚上的睡眠差异,并使用效应大小(ES)评估变化。皮尔逊相关性(r)评估唾液咖啡因水平与睡眠指数之间的关系。
结果:在比赛之夜,运动员上床睡觉晚于比赛前一天晚上(P=.00002,ES=1.84)和比赛后晚上(P=.0003,ES=1.49)。因此,与前一天晚上(P<.0000003,ES=2.36)和比赛后晚上(P=.001,ES=1.53)相比,他们在比赛晚上的睡眠时间减少。与赛前措施相比,比赛后运动员唾液咖啡因浓度显着升高(P<.00000001,ES=4.44),适度,唾液咖啡因浓度变化与晚睡时间无显著相关性(r=.48,P=.07),睡眠潜伏期增加(r=.45,P=.09),睡眠时间减少(r=-.30,P=.28),睡眠效率降低(r=-.34,P=.22)。
结论:这些结果表明,夜间比赛导致橄榄球联盟运动员的睡眠障碍,在比赛之前和比赛期间补充咖啡因会导致比赛后唾液咖啡因浓度大幅增加。
OBJECTIVE: To examine the sleep of rugby league athletes the night before and following an evening match and to investigate the association between caffeine intake and sleep on the night of competition.
METHODS: On the night prior to, night of, and night after a professional rugby league match, 15 athletes had their sleep monitored using wrist activity monitors. Additionally, saliva samples were collected 60 minutes before and 30 minutes after the competition to assess salivary caffeine concentration. Differences in sleep across the 3 nights were examined using linear mixed models, and changes were assessed using effect size (ES). Pearson correlation (r) assessed the relationship between salivary caffeine levels and sleep indices.
RESULTS: On the night of competition, athletes went to bed later than the night before (P = .00002, ES = 1.84) and night after (P = .0003, ES = 1.49) competition. Consequently, their sleep duration was reduced on the night of competition compared with the previous night (P < .0000003, ES = 2.36) and night after competition (P = .001, ES = 1.53). Postcompetition salivary caffeine concentration was substantially elevated in athletes when compared with precompetition measures (P < .00000001, ES = 4.44), and moderate, nonsignificant correlations were observed between changes in salivary caffeine concentration and delayed bedtime (r = .48, P = .07), increased sleep latency (r = .45, P = .09), decreased sleep duration (r = -.30, P = .28), and reduced sleep efficiency (r = -.34, P = .22).
CONCLUSIONS: These results demonstrate that evening competition results in sleep disturbance in rugby league athletes, and caffeine supplementation prior to and during competition leads to substantial increases in postcompetition salivary caffeine concentration.