Reproducibility of the growth hormone response to sprint exercise.
OBJECTIVE
There is a large inter-individual variation in the growth hormone (GH) response to exercise, but within-individual variation is unknown. The purpose of this study was to determine the reproducibility of the GH response to a single 30 s sprint on a cycle ergometer.


METHODS
Eleven non-obese male volunteers completed two trials separated by at least seven days during which they completed a single all-out 30 s sprint on a cycle ergometer followed by 60 min of rest. Blood samples were taken at rest and at regular intervals post-exercise.


RESULTS
No differences were found in mean power output during the sprint, or in peak blood lactate concentrations or lowest measured pH following the sprints. Re-test correlation was significant for both peak GH concentrations (r=0.97, P<0.05) and GH AUC (r=0.97, P<0.05). Within-subject error (change in mean+/-typical error) of the peak GH concentrations and GH area under the curve (AUC) was 4.3+/-3.4 microg l(-1) and 2.9+/-54.3 min microg l(-1), respectively. Within-subject percentage error (percentage change in mean+/-typical percentage error) for peak GH concentration and GH AUC was 33.5+/-26.7% and 1.1+/-20.0%, respectively.


CONCLUSIONS
Growth hormone AUC is a reproducible measure of the GH response to sprint exercise.
Stokes
Keith A
KA
Department of Sport and Exercise Science, Faculty of Science, University of Bath, Bath BA2 7AY, UK. k.stokes@bath.ac.uk
Nevill
Mary E
ME
Lakomy
Henryk K A
HK
Hall
George M
GM
D000328:Adult; D019540:Area Under Curve; D001642:Bicycling / Q000502:physiology*; D016552:Ergometry; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D019382:Human Growth Hormone / Q000494:pharmacology*; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D015203:Reproducibility of Results
D019382:Human Growth Hormone; D019344:Lactic Acid