Abstract
PURPOSE: The purpose of present study was to investigate the acute effects of different intensity treadmill exercise on blood lipids, atherosclerosis index (AI), insulin resistance (homeostatic model assessment index; HOMA index), and energy metabolism in overweight college-aged males. METHODS: Subjects were randomly assigned to either a moderate intensity (n=6, 60-70% HRmax) or high intensity (n=6, 70-80% HRmax) treadmill exercise session that lasted for one hour. Blood lipids, AI, and HOMA index was assessed before and after the one hour exercise session. Data were analyzed by paired and independent t-tests and statistical significance was set at p<0.05. RESULTS: Total cholesterol, HDL-C, LDL-C, glucose levels, and triglycerides, as well as the HOMA index and AI remained unchanged after completion of both the moderate and high intensity exercise sessions. Insulin levels were significantly (p<0.05) decreased following the high intensity exercise protocol but remained unaltered after the moderate intensity session. Both exercise protocols resulted in significant (p<0.05) increases in total protein and free-fatty acid levels. CONCLUSIONS: Exercise intensity does not alter the lack of responses to a single, acute bout of aerobic exercise, reinforcing the importance of the need for long term aerobic exercise programs when targeting weight control and the prevention of obesity.
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