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Effects of exercise-training and detraining on fat cell lipolysis in men and women

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Summary

The effects of training and detraining on adipose tissue lipolysis were studied in 19 healthy subjects (7 women and 12 men) who were submitted to a 20-week aerobic training program. Thereafter, subjects refrained from exercise for a period of 50 days. Suprailiac fat biopsies were performed before training, after training, and at the end of the detraining period. Mean fat cell diameter and epinephrine stimulated lipolysis (ESL) were assessed on collagenase isolated fat cells. Body density through underwater weighing and skinfolds at seven different sites were also obtained. Training significantly increased ESL (P<0.05) in men but not in women. However, ESL values in men returned to pretraining values after the exercise restriction period. No significant changes in women lipolysis were observed under any conditions. Changes in lipolysis were not correlated with changes in body fatness. However, a significant correlation was observed between the increase in ESL produced by training and the subsequent decrease caused by detraining (r=−0.53;P<0.05). The present results suggest that lipolysis in fat cells from the female subjects seems to be insensitive to changes in energy expenditure. Moreover, the present study demonstrates that there are high and low responders in adipocytes ESL to variations in habitual energy expenditure.

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Authors and Affiliations

  1. Physical Activity Sciences Laboratory, Laval University, G1K 7P4, Ste-Foy, Québec, Canada

    J. P. Després, C. Bouchard, R. Savard, A. Tremblay, M. Marcotte & G. Thériault

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  1. J. P. Després
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  2. C. Bouchard
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  3. R. Savard
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  4. A. Tremblay
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  5. M. Marcotte
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  6. G. Thériault
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Supported by FCAC-Québec (EQ-1330, CE-29) and by Natural Siences and Engineering Research Council of Canada (G-0850, A-8150)

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Després, J.P., Bouchard, C., Savard, R. et al. Effects of exercise-training and detraining on fat cell lipolysis in men and women. Europ. J. Appl. Physiol. 53, 25–30 (1984). https://doi.org/10.1007/BF00964685

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  • DOI: https://doi.org/10.1007/BF00964685

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