Effectiveness Evaluation of Continuous Heat Tolerance Training in Standard Heat Chamber

HE Longping; ZHOU Xin; YU Yongchun; LIN Qingwei; ZHONG Lincui; SONG Qing; NING Bo; SONG Jingchun

doi:10.13730/j.issn.2097-2148.2025.08.010

Abstract：Objective To evaluate the effects of continous heat tolerance training in standard heat chamber.Meth-ods A total of 53 healthy officers and soldiers were recruited from January 2021 to December 2024,and underwent 7 consecutive days of heat tolerance training in standard heat chamber(temperature 40 ℃,humidity 40％),the subjects completed 120 min of walking training on the treadmill of 2° slope at the speed of 5 km/h,the maximum core tempera-ture,maximum heart rate,physiological stress index(PSI)and qualified rate of heat tolerance from day 1 to day 7 of the training were compared.Results The basic core temperature of the healthy officers and solders having heat tolerance training was(37.37±0.30)℃,the resting heart rate was(85.36±16.09)beats per minute and the mean arterial pres-sure was(88.45±9.22)mmHg(1 mmHg≈0.133 kPa),after 7 d of continuous training,the vital signs were stable be-fore training.Compared with the first and second days of training,the maximum core temperature taken at test time(TCt)of the officers and soldiers on the third to seventh days of training significantly decreased(P＜0.05).Compared with the first and second days of training,the PSI of the officers and soldiers on the third to seventh days of training sig-nificantly decreased(P＜0.05),compared with the third day of training,the PSI of the officers and soldiers on the fourth to seventh days of training showed a downward trend,but the difference was not statistically significant(P＞0.05).Compared with the first day,the fastest heart rate taken at test time(HRt)of the officers and soldiers on the second day of training had no significant difference(P=0.159),and the HR,of the officers and soldiers on the third to seventh days of training decreased significantly(P＜0.05).During the 7-day thermal tolerance training cycle,the number of subjects who reached the standard of thermal tolerance training test showed an increasing trend every day,27(50.94％)on the first day,30(56.60％)on the second day,41(77.36％)on the third day,44(83.02％)on the fourth day,42(79.25％)on the fifth day,43(81.13％)on the 6th day and 49(92.45％)on the 7th day.Conclusion Three days of heat tolerance training can significantly en-hance the heat tolerance level of personnel engaged in the heat chamber.