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Eur J Clin Nutr. 1999 Feb;53(2):126-33.

Effect of 3 weeks of detraining on the resting metabolic rate and body composition of trained males.

Author information

1
Exercise Physiology Laboratory, School of Education, Flinders University of South Australia, Adelaide, Australia.

Abstract

OBJECTIVE:

To examine the hypothesis that detraining decreases the resting metabolic rate (RMR) of long-term exercisers.

DESIGN:

Eight pairs of subjects were matched for age, mass and training volume. They were then randomly allocated to either a control group (continue normal training) or detraining group (stop normal training but continue activities of daily living).

SETTING:

Exercise Physiology Laboratory, The Flinders University of South Australia.

SUBJECTS:

Sixteen male subjects (age 23.1 +/- 4.7 y (s.d.); mass 73.73 +/- 8.9 kg; VO2max 60.2 +/- 6.3 ml. kg-1.min-1; height 180.3 +/- 5.0 cm; body fat 14.6 +/- 5.4%) were selected from a pool of respondents to our advertisements.

INTERVENTIONS:

Each pair of subjects was measured before and after a 3-week experimental period.

RESULTS:

Two (groups) x 3 (2-, 3-and 4-compartment body composition models) ANOVAs were conducted on the difference between the pre- and post-treatment scores for percentage body fat, fat-free mass (FFM) and relative RMR (kJ.kg FFM-1.h-1). No significant between-group differences were identified except for the detraining group's small decrease in FFM (0.7 kg, P = 0.05). The main effects for body composition model were all significant; but the overall differences between the multicompartment models and the 2-compartment one were less than their technical errors of measurement. No significant interaction (P = 0.51) resulted from a 2 x 2 ANOVA on the pre- and post-treatment absolute RMR data for the control (315.2 and 311.9 kJ/h) and detraining groups (325.4 and 325.5 kJ/h).

CONCLUSIONS:

3-weeks detraining is not associated with a decrease in RMR (kJ/h, kJ.kg FFM-1.h-1) in trained males; hence, our data do not support a potentiation of the RMR via exercise training. The greater sensitivity of the multicompartment models to detect changes in body composition was of marginal value.

PMID:
10099946
[Indexed for MEDLINE]

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