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EFFECT OF TIME OF DAY ON MFO AND FATMAX DURING EXERCISE IN OBESE AND NORMAL WEIGHT WOMEN UDC 796 / 61

Circadian rhythms regulate some of the metabolic and hormonal variables that affect fat oxidation. Thus, the purpose of this study was to investigate the effect of time of day on maximal fat oxidation (MFO) and the exercise intensity at which MFO occurred (FATmax) in obese and normal weight women. The MFO and Fatmax were measured in 10 normal weight and 10 obese women during an incremental running exercise test with 3 min stages on the treadmill by means of the indirect calorimetry method. The student's t-test and the one-way ANOVA with repeated measures were used to analyze the variables. We found that fat oxidation and MFO in both groups were higher in the evening than the morning, but there were no significant differences in the MFO between the obese and normal group. In addition, the fat oxidation rates during low intensity exercise (<60% VO2max) in obese and normal weight groups were similar, but during higher exercise intensity, among normal weight women were significantly higher than among obese women. Our results suggest that exercise in the evening with Fatmax intensity is better for weight loss purposes.