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Detraining of exercise-trained rats: effects on energetic efficiency and brown adipose tissue thermogenesis

Published online by Cambridge University Press:  09 March 2007

Jeff Arnold  and
Denis Richard
Jeff Arnold
Affiliation:
Département de Physiologie, Faculté de Médecine, Université Laval, Qu´bec GIK 7P4, Canada
Denis Richard
Affiliation:
Département de Physiologie, Faculté de Médecine, Université Laval, Qu´bec GIK 7P4, Canada
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Abstract

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1. Complete energy balance measurements were made in exercise-trained (treadmill running) rats subjected to 27 d of exercise detraining.

2. The 20% difference in body-weight that existed at the end of the training period between sedentary and trained rats was negated by detraining. Detrained rats had twice the body-weight gain of their untrained controls.

3. An elevation (12%) in metabolizable energy (ME) intake (relative to body-weight) was observed in detrained rats while their gross energetic efficiency was augmented by 60%.

4. Energy expenditure, excluding the estimated costs of fat and protein storage, was similar for detrained and untrained rats. Complementing the latter was the finding that thermogenesis in brown adipose tissue, a known energy buffering process, was also similar.

5. Elevated ME intake (relative to body-weight) largely contributed to the increased energetic efficiency of detrained rats.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 57 , Issue 3 , May 1987 , pp. 363 - 370
Copyright
Copyright © The Nutrition Society 1987

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