The field study about the effects of artificial CO2-rich cool-water immersion after outdoor sports activity in a hot environment

IF 2.4 2区 医学 Q2 SPORT SCIENCES
Miho Yoshimura , Masatoshi Nakamura , Tatsuya Hojo , Aya Arai , Yoshiyuki Fukuoka
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引用次数: 0

Abstract

Background/Objectives

In our previous laboratory experiment (room temperature of 25 °C), CO2-rich cool-water immersion (CCWI) suppressed subjects' core body temperature even during repeated exercise. It is unclear whether the suppression of body temperature elevation would also continue after CCWI in a hot outdoor environment. Herein we investigated the thermal effects of CCWI after regular exercise training in heat on subjects' core temperature (Tcore), three skin temperatures (Tskin), heart rate (HR), and the rate of perceived ice (RPI).

Methods

Thirty-six subjects (25 males, 11 females) were randomly allocated into three groups (CCWI, CWI, and control). After training at their competitive clubs, each subject was immersed up to the chest in CCWI or CWI at 20 °C for 20 min, followed by a 60-min recovery period. Tcore, Tskin, HR, and RPI were measured at the initial rest, the end of immersion, and every 10 min during the recovery period.

Results

Compared to the control, the CCWI subjects' Tcore was significantly lower at 50–60 min after the end of immersion (p < 0.05). Tskin at abdominal and lower-leg regions during the recovery period was maintained at significantly lower values in the CWI and CCWI groups versus control (p < 0.05). The CCWI subjects maintained lower Tskin for a longer time than the CWI subjects.

Conclusions

These findings indicate that CCWI suppresses the rise in body temperatures more than CWI, even in a hot environment, suggesting that CCWI may be a more effective countermeasure against increasing body temperature in a hot outdoor environment.

高温环境下户外运动后人工富co2冷水浸泡效果的实地研究
背景/目的在我们之前的实验室实验中(室温25°C),富二氧化碳冷水浸泡(CCWI)即使在重复运动中也能抑制受试者的核心体温。目前尚不清楚在室外高温环境下CCWI后体温升高的抑制是否也会继续。在此,我们研究了常规热运动训练后CCWI对受试者核心温度(Tcore)、三皮温度(Tskin)、心率(HR)和感知冰率(RPI)的热效应。方法36例患者(男25例,女11例)随机分为CCWI组、CWI组和对照组。在他们的竞技俱乐部训练后,每个受试者在CCWI或20°C的CWI中浸泡至胸部20分钟,然后进行60分钟的恢复期。Tcore、Tskin、HR和RPI分别在休息初期、浸泡结束时和恢复期间每10分钟测量一次。结果与对照组相比,CCWI被试在浸泡结束后50 ~ 60 min的Tcore得分显著降低(p <0.05)。与对照组相比,CWI组和CCWI组在恢复期腹部和小腿区域的Tskin维持在显著较低的值(p <0.05)。CCWI组维持较低Tskin的时间较CWI组长。结论在高温环境下,CCWI对体温升高的抑制作用强于CWI,提示CCWI可能是室外高温环境下更有效的体温升高对策。
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来源期刊
CiteScore
5.10
自引率
3.60%
发文量
54
审稿时长
31 days
期刊介绍: The Journal of Exercise Science and Fitness is the official peer-reviewed journal of The Society of Chinese Scholars on Exercise Physiology and Fitness (SCSEPF), the Physical Fitness Association of Hong Kong, China (HKPFA), and the Hong Kong Association of Sports Medicine and Sports Science (HKASMSS). It is published twice a year, in June and December, by Elsevier. The Journal accepts original investigations, comprehensive reviews, case studies and short communications on current topics in exercise science, physical fitness and physical education.
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