Increased physical activity and the growth hormone-IGF-I axis in adolescent males

Alon Eliakim, Jo Anne Brasel, Subburaman Mohan, Wai Lee T. Wong, Dan M. Cooper*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)R308-R314
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Issue number1 44-1
StatePublished - Jul 1998
Externally publishedYes


  • Binding proteins
  • Energy expenditure
  • Insulin-like growth factor-I
  • Magnetic resonance imaging
  • Muscle volume


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