Growth hormone responses to repeated bouts of aerobic exercise with different recovery intervals in cyclists.
J Endocrinol Invest
; 28(5): RC11-4, 2005 May.
Article
in En
| MEDLINE
| ID: mdl-16075917
ABSTRACT
To characterise the specific GH responses to repeated bouts of standardised aerobic exercise in amateur competitive cyclists, 6 volunteers (mean age +/- SE 28.7 +/- 2.3 yr, range 18-35 yr) performed two consecutive 30-min cycling sessions at 80% of individual maximal oxygen uptake on three occasions with different time interval between bouts 2 h (EXP A), 4 h (EXP B) and 6 h (EXP C). Serum GH concentration was determined in blood samples collected at 15-min intervals during exercise and following 1 h of recovery. In EXP A and EXP B, peak GH concentration in response to the second bout was significantly lower (p < 0.01) than that of the first bout, but in EXP C no difference was detected between bouts. Similarly, the average integrated GH concentration (AUC), determined during the exercise period and in the following 1 h of recovery in the course of the second bout, was significantly lower than that observed during the first bout only in EXP A (p < 0.05) and EXP B (p < 0.01) and not in EXP C, so that the second bout AUC of EXP C was significantly higher than that of EXP A (p < 0.01) and EXP B (p < 0.01). It was concluded that GH responses to subsequent bouts of aerobic exercise are dependent on the time interval between the exercise sessions.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Bicycling
/
Exercise
/
Human Growth Hormone
Limits:
Adolescent
/
Adult
/
Female
/
Humans
/
Male
Language:
En
Journal:
J Endocrinol Invest
Year:
2005
Document type:
Article
Affiliation country:
Italia