Effects of Heat Acclimatization Training on Football Performance:Evaluating Endurance, Speed, and Recovery in University Players from Hot Climates

Abstract

The present study investigated the effects of 8-week heat acclimatization training (HAT) program on the main performance metrics of the university Football players from the hot area. Population of the study comprised of 46 male players, age 18-25 years, from two different academies of Lahore. Using randomized controlled design, participants were assigned to either experimental (HAT) group (n = 23) or the control group (n = 23). Experimental group completed the five weekly 90-minute sessions of HAT in the controlled environmental conditions (30-35°C, 50-60% relative humidity), incorporating Football-specific drills at progressively increasing intensities (60-85% HRmax). The control group followed their previous standard training schedule. Normality of data was confirmed using Shapiro-Wilk tests (all p>0.05). Pre- and post-intervention assessment was conducted for muscular endurance by Yo-Yo intermittent recovery test level 1, sprint performance by 30m sprint test, cardiovascular recovery by heart rate recovery test at 1-minute post-exercise, and perceived fatigue by the Borg CR-10 scale. Cross examination of pre- and post-test date revealed that experimental group demonstrated significant improvements in all measured variables including muscular endurance increased by 21.9% (p<0.001, d=1.42), sprint time decreased by 5.4% (p=0.003, d=0.85), heart rate recovery improved by 27.3% (p<0.001, d=1.30), and perceived fatigue decreased by 22.7% (p<0.001, d=1.55). Whereas participants of the control group showed no significant changes in any performance metric (all p>0.05). Between-group comparisons demonstrated significantly greater improvements in the HAT group for all outcomes (p<0.01). These findings confirm that structured HAT induces substantial physiological adaptations which enhance Football-specific performance in hot environments particularly during preseason preparation. The large effect sizes across all variables suggest that these improvements are practically meaningful for Football players. Future research should investigate the perseverance of these adaptations across competitive seasons and examine possible gender differences in heat acclimatization responses.