Document Detail

Exercising in the cold inhibits growth hormone secretion by reducing the rise in core body temperature.
MedLine Citation:
PMID:  16644256     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Ambient temperature alters exercise induced GH secretion. It is unknown whether temperature affects GH secretion at exercise intensities above the anaerobic threshold when other factors may override the relationship seen at lower intensities. METHODS: DESIGN: Cross-over study of ambient temperature on exercise induced GH in swimmers and rowers. SETTING: St Thomas Hospital, London. SUBJECTS: Ten healthy men (age 21.7+/-0.8 yrs). Five swimmers and five rowers. INTERVENTION: Forty-minute exercise test at 105% of anaerobic threshold at room temperature (RT) and at 4 degrees C. MEASUREMENTS: Cutaneous and core body temperature. Serum GH concentration. RESULTS: Cutaneous body temperature increased during exercise at RT but decreased in the cold. Although core temperature rose in both settings, the rise was greater at RT (p=0.021). GH increased at both temperatures but the onset was delayed by the cold. Peak GH tended to be higher at RT (17.4+/-3.6 microg/L vs. 9.5+/-1.5 microg/L, p=0.07). Total GH secretion was greater at RT (353.3+/-99.1 microg min/L) than 4 degrees C (128.3+/-21.0 microg min/L), p=0.038. Change in core temperature correlated with log peak GH (r=0.66, p=0.039) and log incremental GH (r=0.67, p=0.032) when exercising at 4 degrees C. There was no difference between swimmers and rowers. CONCLUSIONS: Exercise at 4 degrees C reduces GH secretion during exercise at intensities above the anaerobic threshold. A change in core body temperature may be one mechanism by which exercise induces GH secretion. The difference in GH between swimmers and rowers during their respective events relates to the conditions under which they compete.
Adam Wheldon; Richard L Savine; Peter H Sönksen; Richard I G Holt
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Publication Detail:
Type:  Journal Article     Date:  2006-04-27
Journal Detail:
Title:  Growth hormone & IGF research : official journal of the Growth Hormone Research Society and the International IGF Research Society     Volume:  16     ISSN:  1096-6374     ISO Abbreviation:  Growth Horm. IGF Res.     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-05-29     Completed Date:  2006-11-03     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9814320     Medline TA:  Growth Horm IGF Res     Country:  Scotland    
Other Details:
Languages:  eng     Pagination:  125-31     Citation Subset:  IM    
Department of Medicine, Guy's, King's and St Thomas' School of Medicine, King's College London, London SE1 7EH, UK.
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MeSH Terms
Anaerobic Threshold / physiology*
Cold Temperature*
Exercise / physiology*
Human Growth Hormone / blood*,  secretion
Skin Temperature / physiology*
Sports / physiology
Reg. No./Substance:
12629-01-5/Human Growth Hormone

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