Wen Minglang, Liu Guozheng, Li Wencan, Xie Tao, Zhang Yukun, Qin Fei, Zhao Jiexiu
School of Physical Education, Jinan University, Guangzhou, China.
School of Economics, Jinan University, Guangzhou, China.
Front Physiol. 2022 Nov 1;13:1008710. doi: 10.3389/fphys.2022.1008710. eCollection 2022.
This study aimed to investigate the effects of mixed-cooling strategies, which combines external (cooling vest + neck cooled collar) and internal cooling (cold sports drink ingestion) on measures of executive function during simulated tennis in hot/humid conditions. In a counterbalanced design (randomised order), eight males undertook two trials [one with the mixed-cooling strategy, (MCOOL condition) and another without (CON condition)] in a climate chamber (36.5°C, 50% relative humidity). All subjects completed an intermittent treadmill protocol simulating a three-set tennis match with a 90-second break during odd-numbered games and 120-second breaks between sets, in accordance with the activity profile and International Tennis Federation rules. The mixed-cooling strategies were adopted before test and break time during the simulated tennis match. Stroop task, 2-back task, More-odd shifting task, gastrointestinal temperature (Tgi), skin temperature, blood lactic acid (BLA), heart rate, urine specific gravity (USG), sweat rate (SR), thermal sensation (TS) and perceived exertion (RPE) were measured. Results showed that the mean exercise time was longer in the MCOOL condition than in the CON condition. The SR was greater in CON trial compared with that in MCOOL trial. Results of two-way analysis of variance with repeated measures revealed that time×condition interactions were significant in BLA, Stroop response time, and switch cost of the more-odd shifting task. There were main effects of condition for Tgi, HR, TS, RPE, BLA, Stroop response time, and switch cost of the more-odd shifting task. In a hot/wet environment, pre- and intermittent mixed-cooling strategies can significantly improve exercise time and measures of executive function of tennis players in a simulated tennis match.
本研究旨在调查混合冷却策略的效果，该策略结合了外部冷却（冷却背心+颈部冷却项圈）和内部冷却（饮用冷运动饮料）对在炎热/潮湿条件下模拟网球运动时执行功能指标的影响。在一个平衡设计（随机顺序）中，八名男性在气候室（36.5°C，相对湿度50%）中进行了两项试验[一项采用混合冷却策略（MCOOL条件），另一项不采用（CON条件）]。所有受试者按照活动概况和国际网球联合会规则，完成了一项间歇性跑步机协议，模拟一场三盘网球比赛，奇数局间休息90秒，盘间休息120秒。在模拟网球比赛的测试前和休息时间采用混合冷却策略。测量了Stroop任务、2-back任务、更多奇数转换任务、胃肠道温度（Tgi）、皮肤温度、血乳酸（BLA）、心率、尿比重（USG）、出汗率（SR）、热感觉（TS）和主观用力程度（RPE）。结果表明，MCOOL条件下的平均运动时间比CON条件下更长。CON试验中的出汗率高于MCOOL试验。重复测量的双向方差分析结果显示，时间×条件交互作用在BLA、Stroop反应时间和更多奇数转换任务的切换成本方面具有显著性。条件对Tgi、HR、TS、RPE、BLA、Stroop反应时间和更多奇数转换任务的切换成本有主效应。在炎热潮湿的环境中，预混合和间歇性混合冷却策略可以显著提高模拟网球比赛中网球运动员的运动时间和执行功能指标
