低温環境における運動前の受動的身体加温が高強度運動中の生理的応答に及ぼす影響

概要

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The purpose of this study was to examine the effect of passive warming up before exercise on physiological responses during heavy exercise in a cold environment. Five male subjects participated in this study. All measurements were taken at a room temperature of 16℃. In the passive warming up experiment (PW), bilateral extremities were immersed in hot water at 42℃ for 20 min before exercise. In the cold exposure experiment (CE), subjects were sat for in the room temperature of 16℃ for 35min before exercise. The exercise load was a 6-min heavy cycle exercise at 75% VO_2max (above lactate threshold). Gas exchange parameters (oxygen uptake, CO_2 output, ventilation, respiratory exchange rate), heart rate, rectum temperature, and RPE were measured during both experiments. Blood samples were taken immediately, and at 1, 3, 5, 7, 9 12, 15 min after exercise to determine blood lactate concentration. Oxygen uptake was almost the same in the both experiments. Peak blood lactate concentration after exercise was significantly lower (P<0.05) in PW (12.8±1.9mmol・l) than in CE (13.8±2.5mmol・l). Mean heart rate during exercise was significantly higher in PW (159±8beat・min^<-1>) than in CE (153±6beat・min^<-1>). It is considered that the lower maximal blood lactate concentration in PW may be attributed to decreased anaerobic energy production during exercise due to higher body temperature.
2004-11-20