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观察了８名男青年士兵在干球温度（ＤＢ）３５℃和湿球温度（ＷＢ）２９℃的高温环境下负重行军时的心率、心肌耗氧指数和心输出量的变化特点。结果表明，行军速度４．５、５．０和６．０ｋｍ／ｈ各组的心率、心肌耗氧指数和心输出量的每小时增加值均随负荷重量的增加呈非线性增加。在劳动中心率保持相对稳定状态以及心率、心肌耗氧指数和心输出量每小时增加值与负荷量非线性相关“转折点”相应的负荷量分别为体重的３２％、２３％、和１４％左右。结果提示，当负荷量的增加超过某一数值时，劳动者的心功能紧张程度明显增加，单兵的携行重量以不超过生理反应的非线性“转折点”的负荷量为宜
The changes of heart rate, myocardial oxygen consumption index and cardiac output of 8 young men were observed when they marched under high temperature with the dry-bulb temperature (DB) of 35 ℃ and the wet-bulb temperature (WB) of 29 ℃. The results showed that the hourly values of heart rate, myocardial oxygen consumption index and cardiac output in each group of 4.5, 5.0 and 6.0 km / h marching increased nonlinearly with the increase of load weight. The relative steady-state rates at work centers and the hourly increases in heart rate, myocardial oxygen consumption index and cardiac output correlate with 32%, 23%, and 14% of body weight, respectively, corresponding to the “turning point” . The results suggest that when the load increases more than a certain value, the worker’s cardiac function significantly increased the tension, carrying the weight of individual soldiers to not exceed the physiological response of the non-linear “turning point” load is appropriate