Nonexercise Energy Expenditure and Physical Activity in the Midwest Exercise Trial 2.

• Autores: Erik A. Willis, Richard A. Washburn, Stephen Herrmann, Jeffery J. Honas, Jaehoon Lee, Joseph E. Donnelly
• Localización: Medicine & Science in Sports & exercise: Official Journal of the American College of Sports Medicine, ISSN 0195-9131, Vol. 46, Nº. 12, 2014, págs. 2286-2294
• Idioma: inglés
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• Dialnet Métricas: 2 Citas
• Resumen

  • AB Purpose: This study aimed to examine compensatory changes in nonexercise energy expenditure (NEEx) and nonexercise physical activity (NEPA) in response to an aerobic exercise training program. Methods: Ninety-two overweight/obese (body mass index, 25-39.9 kg[middle dot]m-2) sedentary young adults (18-30 yr) completed a 10-month randomized clinical efficacy trial of aerobic exercise 5 d[middle dot]wk-1 at either 400 kcal per session (n = 37), 600 kcal per session (n = 37), or control (n = 18). Total daily energy expenditure (TDEE) and resting metabolic rate (RMR) were measured at months 0 and 10. NEPA was measured by an accelerometer at months 0, 3.5, 7, and 10. NEEx was calculated by the following formula: [(total daily energy expenditure x 0.9) - RMR] - net EEEx (EEEx-RMR). Mixed modeling was used to examine differences between groups (group effect), within groups (time effect), and group-time interaction for NEEx and NEPA. Results: Within the exercise groups, there were no significant effects (all P > 0.05) of group, time, or group-time interaction for NEPA. In addition, there were no significant within- or between-group differences for change in NEEx. However, activity counts per minute were significantly higher (P < 0.001) in the 600-kcal-per-session group (346 +/- 141 min[middle dot]d-1) versus controls (290 +/- 106 min[middle dot]d-1) at month 7 and significantly higher (P < 0.001) in both the 600-kcal-per-session (345 +/- 163 min[middle dot]d-1) and 400-kcal-per-session groups (317 +/- 146 min[middle dot]d-1) versus controls (277 +/- 116 min[middle dot]d-1) at 10 months. Conclusions: A 10-month aerobic exercise training program in previously sedentary, overweight and obese young adults was not associated with compensatory decreases in NEEx or NEPA. Results suggest that overweight and obese individuals do not become less physically active or spend more time in sedentary pursuits in response to exercise.