the effect of pre-cooling on physiological, functional and perceptual variables in men in an exhaustive intense activity in a warm environment

the aim of this study was to determine the effect of pre-cooling on physiological, functional and perceptual variables in men in an exhaustive intense activity in a warm environment. 10 healthy athlete men (mean age 23.40±1.89 yr, weight 69.80±8.94 kg, height 172±5.98 cm, body fat percentage 10.93±3.39) participated in a separate session in the laboratory; their vvo2max was determined and then they were divided into two groups. they exercised in a heated chamber at 38˚c and 50% humidity. a group wore an ice-vest before activity for 30 minutes in a warm place. after warm-up (speed: 50% vvo2max), the speed of the treadmill increased to vvo2max and continued until exhaustion. heart rate, core body temperature, blood lactate, perceptual variables and tmax were measured. to analyze the data, dependent t test, bonferroni test and anova with repeated measures were used (p=0.005). the results indicated that ice-vest had a significant effect on tmax (p=0.005), rpe (p=0.029) and tss (p=0.001) and improve performance by 27%.    but it had no significant effect on core body temperature (p=0.194), blood lactate (p=0.051) and hr (p=1.00). overall, the results showed that pre-cooling had an effect on functional and perceptual variables but no significant effects on physiological variables.