Determine Of the Exercise Intensity That Elicits Maximal Fat Oxidation In Untrained Male Students

ABSTRACT: Fat and carbohydrate are the main sources of energy for consumption during rest, exercise and training activities, and they are related to factors like duration and intensity of exercise. The present study was designed to determine the maximal fat oxidation rate in untrained male students following an incremental training session. To do so, 9 untrained male students (VO2max: 36.58 ± 2.95 ml.kg.min and BMI 24.28 ± 1.83) took an incremental running test with 3 minute intervals on the treadmill. During the test, fat oxidation rate was measured using indirect stoichiometry method. Maximal fat oxidation and total fat oxidation rate variables were determined during this test. The mean value of fat oxidation rates were compared in 7 levels of exercise intensity with repeated measurement and LSD test. The results showed that maximal fat oxidation rate was 0.23±0.02 g.min in untrained subjects. The total fat oxidation rate in untrained subjects was 1.20 ± 0.13g/min. There was a significant different between the fat oxidation rate during 7 levels of exercise. Based on VO2max and HRmax percentage, the maximal fat oxidation was occur in 42.72±3.01 percent of VO2max and 60.09±3.37 percent of HRmax in untrained subjects. Based on the results, with increase the exercise intensity until Fatmax point the fat oxidation rates were increase and afterward that decrease in higher exercise intensity.