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Original articles  EPIDEMIOLOGY AND CLINICAL MEDICINE 

The Journal of Sports Medicine and Physical Fitness 2008 June;48(2):266-71

Copyright © 2008 EDIZIONI MINERVA MEDICA

lingua: Inglese

Impact of acute exercise on bone turnover and growth hormone/insulin-like growth factor axis in boys

POMERANTS T. 1, TILLMANN V. 2, KARELSON K. 1, JÜRIMÄE J. 1, JÜRIMÄE T. 1

1 Centre of Behavioral and Health Sciences University of Tartu, Tartu, Estonia 2 Department of Pediatrics, University of Tartu, Tartu, Estonia


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Aim. The aim of this study was to investigate the response of N-terminal propeptide of type I procollagen, crosslinked telopeptide of type I collagen and the growth hormone/insulin-like growth factor-I axis to acute aerobic exercise in boys at different pubertal stages
Methods. The subjects were 60 healthy boys (group I - Tanner stage 1, N=20; group II - Tanner stages 2 and 3, N=20; group III - Tanner stages 4 and 5, N=20) who exercised 30 minutes at constant load on cycle ergometer at the level of ~95% of their individual ventilatory threshold. Venous blood samples were obtained before, immediately after and after 30 minutes of recovery for the measurement of serum testosterone, growth hormone (GH), insulin-like-growth factor-I, insulin-like-growth factor binding protein-3, N-terminal propeptide of type I procollagen (PINP) and crosslinked telopeptide of type I collagen.
Results. Acute exercise did not affect significantly serum testosterone, insulin-like-growth factor-I, insulin-like-growth factor binding protein-3 or bone turnover markers concentrations in any of study groups. The rise in growth hormone concentration during exercise was highest in group III (62.3±41.7 mU/L vs 15.5±11.4 in group I and 41.8±20.0 in group II). The increment in serum growth hormone level during exercise was positively correlated (r=0.64; P<0.001) to basal serum testosterone concentration.
Conclusions. It can be concluded that growth hormone response to exercise was directly dependent on serum testosterone concentration. Acute exercise did not affect serum testosterone, insulin-like-growth factor-I, insulin-like-growth factor binding protein-3 or bone markers levels.

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