The Effects of High-Intensity Interval Training and Moderate-Intensity Continuous Training for Heat Acclimation on Resting Thermoregulation and Heart Rate Variability

This study examined the effects of high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT) during a 5-day heat acclimatization protocol (HA) on resting thermoregulation and heart rate variability (HRV).Forty-eight male university students participated in this study.Participants with maximal aerobic power (Pmax) and training experience were divided into four groups using an online randomizer: MICT in normal ambient temperatures (N-MICT), MICT in hot ambient temperatures (H-MICT), HIIT in normal ambient temperatures (N-HIIT), and HIIT in hot ambient temperatures (H-HIIT).

In this study, we found that A 5-day HIIT HA leads to more physiological adaptations compared to MICT HA, suggesting that HIIT HA may be a valuable preventive approach for heat stroke prevention.