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Maximal fat oxidation at the different exercise intensity in obese and normal weight men in the morning and evening

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Author(s): HAMID MOHEBBI | MOHAMMAD AZIZI

Journal: Journal of Human Sport and Exercise
ISSN 1988-5202

Volume: 6;
Issue: 1;
Start page: 49;
Date: 2011;
Original page

Keywords: MAXIMAL FAT OXIDATION | TIME OF A DAY | OBESE AND NORMAL WEIGHT MEN

ABSTRACT
Introduction: Circadian rhythms regulate some metabolic and hormonal variables that affect fat oxidation rates. Thus, the purpose of this study was to investigate Maximal fat oxidation (MFO) at a different exercise intensity in obese and normal weight men in the morning and evening. Methods: MFO was measured in 12 normal weight (BMI 20-25 kg/m2; VO2max 45.7±3.44 ml/min/kg) and 10 obese (BMI >30 kg/m2; VO2max 37.2±3.6 ml/min/kg) men during incremental running exercise test with 3 min stages on the treadmill by indirect calorimetry method. Student’s t-test and one-way ANOVA with repeated measures were used to analysis variables. Results: We found that fat oxidation rates and energy expenditure in both groups in the evening were higher than morning; there were no significant differences in MFO between obese and normal groups. Furthermore, the fat oxidation rate in low intensity exercise (
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