Effects of mixed-method cooling between exercise bouts on thermoregulation and cycling time-trial performance in the heat
Effects of mixed-method cooling between exercise bouts on thermoregulation and cycling time-trial performance in the heat
复制标题
运动回合之间混合方法降温对高温环境下体温调节和自行车计时赛表现的影响
DOI：
10.1016/j.jtherbio.2022.103329
复制
发表时间：
2022
影响因子：
2.7
通讯作者：
Hasegawa Hiroshi
中科院分区：
文献类型：
--
作者：
Yanaoka Takuma;Iwahashi Manami;Hasegawa Hiroshi
本研究探讨了在高温下，运动回合之间的短暂休息期间混合冷却方法对体温调节和自行车计时赛（TT）性能的影响。在一项随机交叉设计中，9名身体活跃的男性进行了两次30分钟的自行车比赛，其中包括25分钟的最大摄氧量55%的恒定节奏自行车，然后在高温（35° C，50%相对湿度）下进行5分钟的TT。两场比赛中间有15分钟的休息时间。在休息期间，参与者被分配到对照试验（CON;在室温下摄入5 g kg− 1液体）或混合方法冷却试验（COOL;摄入5 g kg− 1冰浆和冷却背心以冷却颈部和躯干）。测量了生理数据（直肠[T re]、前额深层组织[T deep head]、平均皮肤[T sk]、前额皮肤[T head]和颈部皮肤[T neck]温度、心率[HR]和皮肤血流量[SkBF]）和感知数据（感知用力[RPE]、热舒适度[TC]和热感觉[TS]）。在15分钟的休息结束时，T深头（− 0.5±0.2° C，p< 0.001），T sk（− 5.6±3.1° C，p= 0.001），T形头（− 0.8±0.4° C，p= 0.001），T型颈（− 9.8±6.0° C，p= 0.002），HR（− 17±6 bpm，p< 0.001），SkBF（− 27.7± 13.9%，p= 0.002），TC（+ 2.6±2.5，p= 0.024），TS（− 4.7±2.5，p= 0.011）与对照组相比，COOL组改善。在第二次运动期间，T股骨头和T颈的减少很快消失（5分钟），但T深头，T头，在第二次TT开始之前，TS在COOL中保持较低。与CON相比，在第二次运动中，COOL的T re（− 0.2±0.2° C，p= 0.002）和RPE（− 1.3±0.9，p= 0.010）较低。COOL组（− 13.9±26.9 W）与CON组（− 29.3±29.4 W; p= 0.015）相比，第二次TT时平均功率输出的降低有所减弱。总之，在短暂休息期间的混合方法冷却减少了生理和感知应变，并提高了自行车TT性能。
This study investigated the effects of mixed-method cooling during a short break between exercise bouts on thermoregulation and cycling time-trial (TT) performance in the heat. In a randomized crossover design, nine physically active men performed two 30-min cycling bouts that consisted of 25-min constant-paced cycling at 55% of maximal oxygen uptake followed by a 5-min TT in the heat (35° C, 50% relative humidity). The two bouts were separated by a 15-min break. During the break, participants were assigned to a control trial (CON; 5 g kg− 1 fluid ingestion at room temperature) or a mixed-method cooling trial (COOL; 5 g kg− 1 ice slurry ingestion and cooling vest to cool the neck and torso). Physiological (rectal [T re], forehead deep-tissue [T deep-head], mean skin [T‾ sk], forehead skin [T head], and neck skin [T neck] temperatures, heart rate [HR], and skin blood flow [SkBF]) and perceptual data (ratings of perceived exertion [RPE], thermal comfort [TC], and thermal sensation [TS]) were measured. At the end of the 15-min break, T deep-head (− 0.5±0.2° C, p< 0.001), T‾ sk (− 5.6±3.1° C, p= 0.001), T head (− 0.8±0.4° C, p= 0.001), T neck (− 9.8±6.0° C, p= 0.002), HR (− 17±6 bpm, p< 0.001), SkBF (− 27.7±13.9%, p= 0.002), TC (+ 2.6±2.5, p= 0.024), and TS (− 4.7±2.5, p= 0.011) improved in COOL compared to CON. Reductions in T‾ sk and T neck were quickly lost (5 min) during the second exercise bout but T deep-head, T head, and TS remained lower in COOL until the commencement of the second TT. Compared to CON, T re (− 0.2±0.2° C, p= 0.002) and RPE (− 1.3±0.9, p= 0.010) were lower in COOL during the second exercise bout. The reduction in mean power output at the second TT was attenuated in COOL (− 13.9±26.9 W) compared to CON (− 29.3±29.4 W; p= 0.015). In conclusion, the mixed-method cooling during a short break reduced physiological and perceptual strain and improved cycling TT performance.