Issn Print: 0195-9131
Publication Date: 2001/05/01
THE EFFECTS OF 6-MONTHS OF AEROBIC EXERCISE VS. RESISTANCE EXERCISE ON RESTING METABOLISM
M W. Hulver; J P. Thyfault; J A. Potteiger
+ Author Information
Author Information: University of Kansas, Lawrence, Kansas
Excerpt
We compared the effects of 6-months of aerobic exercise vs. resistance exercise on resting metabolism in 17 healthy, overweight, middle-age men. At baseline, subjects were randomized to supervised exercise groups consisting of either aerobic exercise (AE) (n = 7; age, 36 ± 3 y; BMI, 31 ± 4 kg/m2) or resistance exercise (RE) (n = 10; age, 36 ± 6 y; BMI, 31 ± 4 kg/m2). The AE program of walking and/or jogging elicited a target heart rate that corresponded to 70–80% of maximal aerobic power and progressed from 3 d per week for 20 minutes to 4 d per week for 45 minutes across 10 weeks. The resistance exercise program consisted of high intensity resistance training designed to target all major muscle groups. Training began at 3 d and progressed to 4 d per week across 10 weeks. Both groups completed 3-d dietary food records at baseline and 6-months and were provided with nutritional counseling on how to reduce daily energy intake by 2093 kJ/d (500 kcal). Resting metabolism was assessed for 30 min at baseline and 6-months using indirect calorimetry. Resting metabolic rate was calculated using the Weir equation and expressed as absolute (RMR) and relative (RMR/FFM) values. Both the AE and RE groups significantly decreased daily energy intake from baseline to 6-months (AE, 12671.1 ± 2947.7 to 8304.0 ± 2228.1 kJ/d; RE, 11627.6 ± 3189.5 to 9187.0 ± 1924.8 kJ/d). The AE group experienced a significant decrease in body mass from baseline (102.7 ± 10.4 kg) to 6-months (95.9 ± 6.9 kg). Conversely, the RE group demonstrated no change in body mass (baseline, 100.2 ± 11.8 kg; 6-months, 99.4 ± 12.1 kg). No significant differences existed between AE and RE in RMR or RMR/FFM at any time point. However, the AE group demonstrated a significant decrease in RMR and RMR/FFM from baseline (RMR, 8427.1 ± 451.0 kJ/d; RMR/FFM, 127.4 ± 14.4 kJ/d) to 6-months (RMR, 7353.0 ± 715.1 kJ/d; RMR/FFM, 112.8 ± 10.0 kJ/d). The RE group had no significant change in RMR, but did show a significant decrease in RMR/FFM from baseline (RMR, 7885.1 ± 912.5 kJ/d; RMR/FFM, 124.0 ± 9.3 kJ/d) to 6-months (RMR, 7551.1 ± 1174.4 kJ/d; RMR/FFM, 117.0 ± 13.0 kJ/d). We conclude that 6-months of aerobic exercise in conjunction with reduced energy intake resulted in a decrease in RMR. In addition, both exercise interventions in combination with reduced energy intake resulted in a decrease in RMR/FFM. Supported by AHA grant 9951116Z.
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