Introduction: Fat is considered as one of the main energy sources used during sport activities and exercise. In this regard, factors such as time and exercise intensity, the kind of sport activity and the extent of body fitness are related and play an undeniable role in between. Environmental conditions and seasonal variations are fairly problematic and troublesome for humans. Some of physiological variations which normally take place under incongruous environmental conditions affect all the organs. The aim of this study is to investigate activity intensity corresponding to FAT max after a session of aerobic progressive exercise in two different environmental temperatures.
Methods: This study is of a semi-experimental type. 15 active and healthy students with an average VO2max of 42 ml.kg.m, age: 22.14± 1.79, height: 161± 5.09 cm, weight: 55.85± 5.19 kg, chosen by available sampling method participated in the study. An aerobic activity on treadmill in two temperatures; maximum 40°c and at least 20°c, was done by the participants on two different days intervened by a week. Respiratory gases and heart rate were reposted during the activity and also the amounts of fat oxidations were calculated by means of element measurement equations. Data analysis was conducted by SPSS 17 and repeated mister and Post hoc T tests.
Results: The findings indicated that the average of activity intensity corresponding to FAT max in high temp environment is (48.85%) and in low temp environment is (42.85%) and maximum used oxygen for both environments was (P=0.0001). Therefore, one may conclude that after a session of aerobic progressive exercise, compared to low temp environment; the extent of activity intensity corresponding to FAT max in high temp environment is significantly greater.
Discussion: The results of the present study revealed that exercise intensity in different environments lead to difference in reaching the FAT max. This difference was noticeable in both relative and absolute intensities. Thus, there is a considerable and significant relationship between environment temperature in which the activity is done and the amount of fat oxidation in different intensities. The present study results are in line with the study carried out by Shorten et al.