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- Title
FREQUENCY OF EXERCISE AND METABOLIC RESPONSES DURING SITTING, EXERCISE, AND POST-EXERCISE PERIODS.
- Authors
Fenemor, Stephen P.; Peddie, Meredith C.; Skeaff, C. Murray; Perry, Tracy L.; Homer, Ashley R.; Rehrer, Nancy J.
- Abstract
Background: Breaking sedentary time imparts metabolic benefits in terms of postprandial glycaemia and insulinaemia, however, the effect of exercise frequency on metabolism during sitting, exercise and post-exercise periods has not been investigated. Aim: To compare energy expenditure (EE) and substrate oxidation between different profiles of breaking up prolonged sitting. Methods: Thirty-six (male=11) sedentary individuals, (age 26±4 y, BMI 24.1±4.6, VO2max 36±8 mL.kg-1.min-1, mean±SD) performed four, two-day trials, in a randomised-controlled, crossover design: (1) prolonged sitting (SE), (2) sitting with regular activity breaks every 30 min for 2 min (RAB), (3) prolonged sitting with 30-min of continuous exercise at the end of day 1 (PA), (4) RAB and PA combined (RAB+PA). All treadmill exercise was undertaken at a speed/incline corresponding to 60% VO2max. Participants consumed standardised meals during interventions and an ad libitum meal at the conclusion of day 2. Indirect calorimetry was used to estimate EE, carbohydrate, and fat oxidation during sitting, exercise, and post-exercise periods. Results: Total EE on day one (7-h) in SE (2401±92kJ, mean±SE) was less than PA (3110±92kJ), RAB (3267±92kJ), and RAB+PA (4150±92kJ); all p< 0.001. There was no difference in total EE on day one between PA and RAB (p= 0.516). Post-exercise EE in PA (64±4kJ), on day one was less than RAB (697±31kJ) and RAB+PA (615±26kJ); both p< 0.001. Total carbohydrate oxidation on day one in RAB (90±6g) was less than PA (144±6g) and RAB + PA (129±6g); both p < 0.001. Total fat oxidation in SE (7.4±1.2g) on day one was less than RAB+PA (12.9±1.5g); p = 0.027. Conclusions: Increasing not only duration but frequency of activity alters EE as a result of exercise. More frequent bouts, vs. one continuous bout, result in increased post-exercise EE. This elevation in EE punctuated throughout the day may be responsible for altered postprandial metabolic responses.
- Subjects
EXERCISE; SITTING position; SEDENTARY behavior; PHYSIOLOGY
- Publication
New Zealand Journal of Sports Medicine, 2017, Vol 44, Issue 1, p34
- ISSN
0110-6384
- Publication type
Abstract