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00005768-200305001-0170500005768_2003_35_s308_marra_composition_5miscellaneous< 18_0_5_0 >Medicine & Science in Sports & Exercise©2003The American College of Sports MedicineVolume 35(5) Supplement 1May 2003p S308EFFECT OF MODERATE AND HIGH INTENSITY AEROBIC EXERCISE ON BODY COMPOSITION IN OVER WEIGHT MEN[G-15C FREE COMMUNICATIONS/SLIDE EXERCISE PRESCRIPTION AND WEIGHT LOSS]Marra, C C.1; Bottaro, M M.1; Oliveira, R J.1; Novaes, J S.11Catholic University of Brasilia, DF, Brazil and Federal University of Rio de Janeiro, RJ, BrazilThe optimal aerobic exercise training intensity to improve body composition in overweight men is unclear.PURPOSEThe purpose of this study was to determine the effect of 14 wks of high intensity versus moderate intensity aerobic exercise of equal work output on body composition in overweight men (BMI between 25 – 29.9 kg/m2).METHODSSixteen sedentary military men (18 – 33 yrs) were randomized in 2 equal groups (n = 8): 1) moderate intensity exercise (MIG; 60 – 70% of their maximum heart rate-HRmax), and 2) high intensity exercise (HIG; 75 – 90 % HRmax). The aerobic exercise (jogging/running) training program was performed three days/wk. The jogging/running distance was 3-km during the first 5 wks and 4-km during the last 9 wks. Relative body fat (%BF) was assessed by Dual Energy X-ray Absorptiometry (Lunar DPX - IQ). To better control internal validity all the subjects slept and had their meals inside the military base. Significant differences between and within the groups were analyzed using a two-way split-plot analysis of variance (SPANOVA). Statistical significance was accepted at an alpha level of p < 0.05.RESULTSThere was no significant mean %BF difference between the MIG (27.09 SD 2.80 %BF) and the HIG (27.40 SD 7.09 %BF) at baseline. After the 14 wks of the aerobic exercise program the mean %BF of the HIG significantly (p < 0.05) decreased to 22.49 %BF (▵ = 4.91 %BF). The decrease in mean %BF (▵ = 1.4 %BF) in the MIG was not significant (p> 0.05).CONCLUSION14 wks of higher intensity aerobic exercise may be more effective in improving body composition than low intensity aerobic exercise in overweight young military men with physical characteristics similar to the present study.EFFECT OF MODERATE AND HIGH INTENSITY AEROBIC EXERCISE ON BODY COMPOSITION IN OVER WEIGHT MENMarra, C C.; Bottaro, M M.; Oliveira, R J.; Novaes, J S.G-15C Free Communications/Slide Exercise Prescription and Weight Loss535