An Exploratory Study of Establishing Exercise Load Standards in Outdoor Thermal Environments from the Heat Transfer Perspective of Human Body Core Temperature
The outdoor thermal environment plays an important role in Summer Olympic Games and other important sports events.Based on human body core temperature and from the heat transfer perspective,this study quantitatively simulated the impact of outdoor thermal envi-ronment factors on exertional heat stroke(EHS).Besides,this study investigated the recommen-datory duration of exercise under various outdoor thermal environments and different exercise loads.The results show that:1)Among the factors that increase the human body core tempera-ture,the heat produced by human metabolism accounted the highest(94.46%),which was fol-lowed by the heat transfer by radiation.2)Among the heat lost by the human body,the sweat evaporation dissipated the most(60.41%),much higher than convection(25.40%)and respira-tion(14.19%).3)The influence degree of thermal environment on EHS in descending order is exercise load,ambient temperature,solar radiation intensity,relative humidity,and wind speed.4)During high-intensity exercise in outdoor thermal environment,the shortest time of occur-rence of exertional heat stroke was 13.7 min,with ambient temperature 35℃,relative humidity 80%,solar radiation intensity 1 000 W/m2,wind speed 2 m/s and exercise intensity 12 METs.5)The longest time of occurrence of exertional heat stroke was 89.8 min with ambient tempera-ture 25℃,relative humidity 60%,solar radiation intensity 800 W/m2,wind speed 4 m/s,and ex-ercise intensity 6 METs.This study listed the recommended exercise duration in different exer-cise intensities in 162 outdoor thermal environments.In competition and training practices,coaches can select appropriate exercise duration based on thermal environment parameters and empirical values of the intensity of the specific sport.
outdoor thermal environmentexercise loadhuman body core temperatureexertional heat stroke
万方数据
维普
