Comparison Of Post-Exercise Resting Metabolic Rate After Thirty Minutes Of Intermittent Treadmill And Resistance Exercise

Abstract

PURPOSE: The purpose of this study was to evaluate the acute effects of highintensity intermittent resistance exercise (RE) and intermittent treadmill (IT) exercise on 14-hour post-exercise metabolic rate (MR) and 24-hour post-exercise resting metabolic rate (RMR). METHODS: During 2 separate menstrual cycles, 7 trained female subjects (mean age 23 ± 3 years) slept overnight in the laboratory for two consecutive nights during their early follicular menstrual phase. Following one control night the subjects completed one exercise protocol at 7:00 am. MR and RMR were measured again at 14 and 24 hours post-exercise, respectively. The RE and IT protocols were randomly assigned. Total exercise duration for both protocols were 30 minutes and the ratio of exercise interval:recovery time (30 seconds:60 seconds) was constant between the two protocols. Intensity was >90% VO2max and 80% of 1-repetition maximum for the IT and RE, respectively. A One-way Analyses of Variance was used to analyze data. Significance was accepted at p<0.05. RESULTS: Kilocalories expended and average heart rate during IT were significantly higher (298 ± 49 kcals; 169 ± 11 beats/min) than RE (129 ± 29 kcals; 134 ± 18 beats/min). At 14 hours post-exercise, MR was significantly higher after both IT (8.8%) and RE (11.8%) when compared to control (C) conditions (C:3.4 ± 0.3; IT:3.7 ± 0.3; RE:3.8 ± 0.3 ml/kg/min). At 24 hours post-exercise, RMR was not significantly different among the three conditions (C:3.2 ± 0.3; IT:3.2 ± 0.3; RE:3.4 ± 0.4 ml/kg/min). CONCLUSION: Both protocols demonstrated that 30 minutes of intermittent highintensity exercise can increase energy expenditure for up to 14 hours after exercise. These findings may have important implications for weight loss programs.