The optimal aerobic exercise training intensity to improve body composition in overweight men is unclear. The purpose of this study was to determine the effect of 14 weeks of high intensity versus moderate intensity aerobic exercise of equal work output on body composition in overweight men (BMI 25 to 29.9 kg/m2). Sixteen sedentary military men (18 to 33 yrs) were randomized in two equal groups (n = 8): (1) moderate intensity exercise (MI; 60 to 70% of their maximum heart rate; HRmax), and (2) high intensity exercise (HI; 75 to 90% HRmax). The aerobic exercise (jogging/running) training program was performed three days/wk. Relative body fat (% BF) was assessed by dual energy xray absorptiometry (DXA) (Lunar DPX-IQ). Significant differences between and within the groups were analyzed using a two-way split-plot analysis of variance (SPANOVA). Statistical significance was accepted at p < 0.05. After the 14 wks of the aerobic exercise program the mean %BF of the HI significantly (p < 0.05) decreased to 22.49% (SD 4.91%). The decrease in mean %BF (delta = 1.4%) in the MI was not significant (p > 0.05). It is concluded that 14 wks of HI aerobic exercise may be more effective in improving body composition than MI aerobic exercise in overweight young military men with physical characteristics similar to the present study.

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