日本ヒートアイランド学会

金谷 和幸　Kazuyuki KANATANI*1 河端 隆志　Takashi KAWABATA *1　

*1 関西大学大学院人間健康研究科 Laboratory of Environmental Physiology for Exercise, Graduate School of Health and Well-being, Kansai University, Japan

概要

The aim of the present study was to examine the effect of cryo-stimulation after exercise in a hot environment. The subjects completed a submaximal (70% Vo₂max) constant-load exercise test for 30 min in a hot environment (Ta35°C, RH60%). After exercise, four experimental conditions were set: no cooling (CNT), whole-body cryo-stimulation (WBC) and lower limb cryo-stimulation (LLC) using a cryo-bath at -120°C, plantar cryo-stimulation (PC) using an ice pack at -55°C for 2 min. There was a significant decrease in esophageal temperature, heart rate, muscle (thigh) temperature and forearm blood flow, and thermal sensation and a significant increase stork volume in after cryo-stimulation compared to CON. Skin temperature decreased significantly in WB and LL. After exercise cryo-stimulation cooled the skin, which caused vasoconstriction, and the flow of cooled blood from periphery to center, resulting in a decrease in core temperature. Two minutes of cryo-stimulation also reduced heat stress after exercise in a hot environment, suggesting the effectiveness of cryo-stimulation after exercise in a hot environment.