常温环境递增负荷运动中人体核心体温预测

Prediction of Core Body Temperature during a Load-incremental exercise in a Normal Temperature Environment

目的:探讨常温环境人体运动中核心体温的预测方法,为预防运动型热损伤提供依据。方法:9名男性耐力性运动员在23℃、40%相对湿度的环境中进行递增负荷力竭自行车运动,起始负荷为100 W,增加20 W/10 min,维持60转/分;连续监控核心体温、心率、血乳酸。结果:核心体温升高值与心率(r=0.906)、血乳酸(r=0.835)正相关(均P<0.001)。核心体温升高值的预测模型:线性方程为:核心体温升高值=0.008×心率+0.00035×心率×血乳酸-0.670(R2=0.842,P<0.001);二次曲线方程为:核心体温升高值=0.221-0.007×心率+6.899×10-5×心率2(R2=0.827,P<0.001)。结论 :常温环境运动中人体的核心体温可应用心率和血乳酸进行预测。

Objective： To explore a method of predicting core body temperature in a normal temperature environment in order to provide reference for preventing heat injury in exercise. Method： Nine male endurance athletes performed a load-incremental exercise to exhaustion on a cycle ergometer in a room with the temperature of 23℃ and the relative humidity of 40%. The exercise started with the load of 100 W, which was increased by 20 W every 10 min at a pedaling cadence of 60 rmp. During the experiment, the core body temperature, heart rate and blood lactic acid were monitored continuously. Result： The increased value of core body temperature correlates positively with heart rate（r=0.906） and blood lactic acid（r=0.835）（both P0.001）.The predictive model of the increased value of core body temperature is as follows ：Linear equation： increased value of core body temperature=0.008 ×heart rate＋0.00035 ×heart rate ×blood lactic acid-0.670（R2=0.842, P0.001）. Quadratic curve equation： increased value of core body temperature=0.221-0.007 ×heart rate ＋6.899 ×10-5×heart rate2（R2=0.827, P0.001）. Conclusion： In normal temperature environment,core body temperature can be predicted by heart rate and blood lactic acid during exercise.