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Department of Human Biology and Department of Movement Sciences, University of Limburg, 6200 MD Maastricht, The Netherlands
Received 26 March 1996; accepted in final form 5 September 1996.
Van Etten, Ludo M. L. A., Klaas R. Westerterp, Frans T. J. Verstappen, Bart J. B. Boon, and Wim H. M. Saris. Effect of an
18-wk weight-training program on energy expenditure and physical
activity. J. Appl. Physiol. 82(1):
298-304, 1997.
The purpose of this study was to examine the
effect of an 18-wk weight-training program on average daily metabolic
rate (ADMR). Before the intervention and in weeks
8 and 18 (T0,
T8, and
T18, respectively) data on body
composition, sleeping metabolic rate (SMR), food intake, energy cost of
the weight-training program
(EEex), and nontraining physical
activity (accelerometer) were collected in the exercise group (EXER,
n = 18 males). ADMR was determined in
a subgroup (EX12, n = 12) by using
doubly labeled water. At T0 and
T18, data (except ADMR) were also
collected in a control group (Con, n = 8). Body mass did not change in EXER or Con. Fat-free mass increased only in EXER with 2.1 ± 1.2 kg, whereas fat mass decreased in EXER
as well as Con (2.0 ± 1.8 and 1.4 ± 1.0 kg, respectively). Initial ADMR (12.4 ± 1.2 MJ/day) increased at
T8 (13.5 ± 1.3 MJ/day, P < 0.001) with no further increase
at T18 (13.5 ± 1.9 MJ/day). SMR did not change in EXER (4.8 ± 0.5, 4.9 ± 0.5, 4.8 ± 0.5 kJ/min) or Con (4.7 ± 0.4, 4.8 ± 0.4 kJ/min). Energy intake did
not change in EXER (10.1 ± 1.8, 9.7 ± 1.8, 9.2 ± 1.9 MJ/day) or Con (10.2 ± 2.6, 9.4 ± 1.8, 10.1 ± 1.5 MJ/day)
and was systematically underreported in EX12 (
21 ± 14, 28 ± 18, 34 ± 14%,
P < 0.001).
EEex (0.47 ± 0.20, 0.50 ± 0.18 MJ/day) could only explain 40% of the increase in ADMR.
Nontraining physical activity did not change in both groups. In
conclusion, although of modest energy cost, weight-training induces a
significant increase in ADMR.
doubly labeled water; accelerometer; sleeping metabolic rate; food intake; physical exercise
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