Equipment exercise in high temperatures and humidity environments promotes heat acclimation
Objective To find out whether the equipment training and high-intensity interval training(HIIT)methods can resist heat stress effectively by monitoring the physiological indicators of the human body during training.Methods Twenty-four male volunteers were assigned randomly to the equipment group(EQUIP),high-intensity interval training group(HIIT);and the non-acclimated control group(CON),respectively.The equipment group completed nine(training for 10 minutes on each equipment)equipment training sessions(90 minutes,35 ℃ and 70％RH)while the HIIT group accomplished eight(8 exercises,triplicate training for each exercise)HIIT training sessions(40 minutes,35 ℃ and 70％RH)for ten consecutive days.Both groups rested on the sixth day and all participants completed heat stress tests(HST)at 35 ℃ and 70％RH before(HST1)and after(HST2)training sessions.Throughout training sessions and HST,the rectal temperature(Tre),skin temperature(Tsk)and heart rate(HR)were recorded.Results It was found that the Tre,average Tsk and average HR of the equipment group and the HIIT group at HST2 were significantly lower than those at CON and HST1(P＜0.05).During the training sessions,the Tre of the equipment group began to decrease significantly on the 3rd day and remained unchanged from the 5th to the 10th day(38.1 ℃～38.2 ℃).However,the Tre of the HIIT group decreased significantly on the 8th day,and remained between 38.4℃～38.5 ℃ from the 8th to 10th day.The HIIT group had a higher rate of perspiration than the equipment group(t=2.289～4.795,P≤0.001～0.038),but there was no difference in this rate within the group(P＞0.05).Analysis led to the mathematical equation:T2=0.301+0.984 T1+0.01 HRmax(R2=0.578,P＜0.001).Conclusion Equipment training can effectively improve the tolerance of the human body to heat stress,and provide feasible measures for improving heat tolerance of pilots.
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