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1 Division of Pediatric
Endocrinology,
Insulin-like growth factor-I (IGF-I) is
associated with muscle hypertrophy, and circulating IGF-I levels are
correlated with fitness. To test the hypothesis that IGF-I increases
with increased physical activity in adolescent males, 38 subjects (16 ± 0.7 yr old) were randomized to control
(n = 18) or increased physical activity groups for 5 wk. Before and after the intervention, we measured thigh muscle volume using magnetic resonance imaging and serum
levels of mean growth hormone (GH) by overnight multiple sampling, GH
binding protein (GHBP), IGF-I, and IGFBPs 1-5 by standard assays.
Energy expenditure was assessed with the doubly labeled water technique
toward the end of the study. In the training subjects there was
1) a significant increase in thigh
muscle volume (+3.6 ± 1%), 2)
15.5 ± 3.3% greater energy expenditure than in controls, and
3) no evidence of weight loss (+1.44 ± 0.4%). In contrast to our hypothesis, but similar to our recent
observations in adolescent females, training decreased IGF-I (
12 ± 4%, P < 0.005). Moreover,
training substantially reduced GHBP (21 ± 4%, P < 0.00002) and increased IGFBP-2
(+40 ± 16%, P < 0.008). Brief training increased muscle volume in weight-stable adolescent males and,
surprisingly, influenced not only IGF-I but GHBP and IGFBP-2 as well in
a manner typically found in energy-deficient states.
binding proteins; muscle volume; energy expenditure; magnetic resonance imaging; insulin-like growth factor-I
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