Fat and Carbohydrate Oxidation during and after one Session of Different Exercise Intensities in Non-athletes young men

The purpose of present study was to compare fat oxidation rate during and after three different exercise intensities. Eight non-athletes male students (aged, 19.7±1.8 yr; height, 174.3±5.1 cm; weight, 64.5±7 kg; VO2max, 40.1±4.4 ml/kg/min) were in this study and exercised at 55, 65, and 75% VO2max on treadmill at three separate days which elapsed by at least one week. Experimental protocol consisted of a 15 min pre-exercise resting, 60 min exercise, and 2-h recovery periods. Fat oxidation was calculated by using an indirect energy measurement method (Indirect calorimetric) was used throughout the experimental protocol] to measure fat oxidation rate. The results of present study showed that absolute fat oxidation rates during and after 75% VO2max and also total absolute fat oxidation rates were significantly higher than other intensities (P≤ 0.05). Relative fat oxidation rate during 55% VO2max was significantly higher than other intensities (P≤ 0.05), but relative fat oxidation rate and total relative fat oxidation rate were not significantly different after three exercise intensities. Absolute CHO oxidation during the three intensities and total absolute CHO oxidation increased with intensity; however, there was no significant difference in this. But, there was a significant difference in relative CHO oxidation during exercise at 55 and 75 % VO2 max (P≤ 0.05). In post exercise recovery period, absolute and relative CHO oxidation decreased with intensity (P≤ 0.05). Energy expenditure during 75% VO2max and total Energy expenditure were significantly higher than other intensities (P≤ 0.05). It was concluded that exercise with 75% VO2 max can be beneficial to reduce and maintenance of the weight.