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Human Studies Department, University of Alabama at Birmingham, Birmingham, Alabama 35294-1250
The purpose of this study
was to determine what effects 26 wk of resistance training have on
resting energy expenditure (REE), total free-living energy expenditure
(TEE), activity-related energy expenditure (AEE), engagement in
free-living physical activity as measured by the activity-related time
equivalent (ARTE) index, and respiratory exchange ratio (RER) in 61- to
77-yr-old men (n = 8) and women (n = 7). Before and after training, body composition (four-compartment
model), strength, REE, TEE (doubly labeled water), AEE (TEE
REE + thermic response to meals), and ARTE (AEE adjusted for
energy cost of standard activities) were evaluated. Strength (36%) and
fat-free mass (2 kg) significantly increased, but body weight did not
change. REE increased 6.8%, whereas resting RER decreased from 0.86 to
0.83. TEE (12%) and ARTE (38%) increased significantly, and AEE
(30%) approached significance (P = 0.06). The TEE
increase remained significant even after adjustment for the energy
expenditure of the resistance training. In response to resistance
training, TEE increased and RER decreased. The increase in TEE occurred
as a result of increases in both REE and physical activity. These
results suggest that resistance training may have value in increasing
energy expenditure and lipid oxidation rates in older adults, thereby
improving their metabolic profiles.
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