University of Tehran Journal of Sport Biosciences 2008-9325 9 1 2017 05 22 The Effect of High Intensity Interval Training in Heat Environment on Aerobic and Anaerobic Performance in Active Men The Effect of High Intensity Interval Training in Heat Environment on Aerobic and Anaerobic Performance in Active Men 45 62 62276 10.22059/jsb.2017.62276 FA Seyed Mohamad Seyedi Bidgoli MSc Student of Kharazmi University Hamid Rajabi Associate Professor of Kharazmi University 0000-0002-3276-1598 Journal Article 2014 12 26  The aim of this study was to determine the effect of high intensity interval training in heat environment on aerobic and anaerobic performance in active men. 24 active university students were divided into three groups: training in the heat environment (HE) (<em>n</em>=8), training in natural environment (NE) (<em>n</em>=8) and control (<em>n</em>=8) as matched subjects according to VO_2max estimation. HE and NE subjects trained for two consecutive weeks in 12 training sessions. Each session included 5 sets of 150 seconds of running on treadmill with 85-90% of vVO_2max with 150 seconds of active recovery between each two sets with 50% of vVO_2max. Before and after the training protocol, subjects performed T_max test and maximal incremental test on a treadmill to evaluate the aerobic performance and Wingate test was used to assess anaerobic performance in an environment with 23±1° temperature and 35±5% natural humidity. For data analysis, one-way ANOVA was used (<em>P</em><0.05). Results showed that high-intensity interval training in a heat environment significantly increased vVO_2max, T_max, maximum distance, speed of aerobic power and mean anaerobic power (14.3%, 16.3%, 33.4%, 40.1% respectively) compared to the NE group. But the peak anaerobic power significantly increased (15%) only compared to the control group (<em>P</em><0.05). Also, lactate significantly reduced only in HE group (-12.6%) but the differece was not significant in inter-group comparisons (<em>P</em><0.05). The control group showed no significant differences in indices (<em>P</em><0.05). In general, the results showed that two weeks of high-intensity interval training in a heat environment significantly enhanced the aerobic performance and some anaerobic performance indices compared to the natural environment  The aim of this study was to determine the effect of high intensity interval training in heat environment on aerobic and anaerobic performance in active men. 24 active university students were divided into three groups: training in the heat environment (HE) (<em>n</em>=8), training in natural environment (NE) (<em>n</em>=8) and control (<em>n</em>=8) as matched subjects according to VO_2max estimation. HE and NE subjects trained for two consecutive weeks in 12 training sessions. Each session included 5 sets of 150 seconds of running on treadmill with 85-90% of vVO_2max with 150 seconds of active recovery between each two sets with 50% of vVO_2max. Before and after the training protocol, subjects performed T_max test and maximal incremental test on a treadmill to evaluate the aerobic performance and Wingate test was used to assess anaerobic performance in an environment with 23±1° temperature and 35±5% natural humidity. For data analysis, one-way ANOVA was used (<em>P</em><0.05). Results showed that high-intensity interval training in a heat environment significantly increased vVO_2max, T_max, maximum distance, speed of aerobic power and mean anaerobic power (14.3%, 16.3%, 33.4%, 40.1% respectively) compared to the NE group. But the peak anaerobic power significantly increased (15%) only compared to the control group (<em>P</em><0.05). Also, lactate significantly reduced only in HE group (-12.6%) but the differece was not significant in inter-group comparisons (<em>P</em><0.05). The control group showed no significant differences in indices (<em>P</em><0.05). In general, the results showed that two weeks of high-intensity interval training in a heat environment significantly enhanced the aerobic performance and some anaerobic performance indices compared to the natural environment https://jsb.ut.ac.ir/article_62276_7cfabefb41c3edb71dcd7056fed84cb9.pdf