Document Detail


Effects of cold environment exposure and cold acclimatization on exercise-induced salivary cortisol response.
MedLine Citation:
PMID:  19737029     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: Considering the adverse effects of exercise-induced cortisol secretion on health in athletes, it is important to determine the environmental and individual factors that contribute to the variations in exercise-induced cortisol secretion. In this study, the effects of cold environment exposure and cold acclimatization on exercise-induced salivary cortisol responses were investigated. METHODS: Short track skaters (n = 11), who usually practice under cold conditions, and inline skaters (n = 11), who usually practice under room temperature conditions, participated in a randomized crossover study. All participants cycled for 60 minutes at 65% Vo2 max under cold (ambient temperature: 5 +/- 1 degrees C, relative humidity 41% +/- 9%) and room temperature (ambient temperature: 21 +/- 1 degrees C, relative humidity 35% +/- 5%) conditions. The participants had a 120-minute bed rest recovery phase at room temperature after both exercise bouts. Cortisol levels were measured in saliva samples collected pre-exercise and postexercise at 1 minute, 30 minutes, 60 minutes, and 120 minutes. RESULTS: Both short track and inline skaters exhibited clear cortisol responses to exercise under cold and room temperature conditions. The magnitude of the cortisol response, however, was different between skaters and conditions. The inline skaters exhibited significantly higher cortisol values under cold conditions than under room temperature conditions (7.6 nmol/L and 4.2 nmol/L, respectively). However, the short track skaters exhibited significantly higher cortisol values under cold conditions compared to room temperature conditions (8.7 nmol/L and 5.4 nmol/L, respectively). CONCLUSIONS: The effects of cold environment exposure on exercise-induced cortisol response were different between skaters who usually practice under cold or room temperature conditions. These results can be interpreted as acclimatization to either cold or room temperature conditions attenuating the cortisol response, suggesting that acclimatization may be beneficial in reducing the exercise-induced cortisol response.
Authors:
Shuhei Izawa; Kijin Kim; Takayuki Akimoto; Nayoung Ahn; Hoseong Lee; Katsuhiko Suzuki
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Wilderness & environmental medicine     Volume:  20     ISSN:  1080-6032     ISO Abbreviation:  -     Publication Date:  2009  
Date Detail:
Created Date:  2009-09-09     Completed Date:  2009-10-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9505185     Medline TA:  Wilderness Environ Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  239-43     Citation Subset:  IM    
Affiliation:
Institute for Biomedical Engineering, Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, Tokyo, Japan. izawa@aoni.waseda.jp
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MeSH Terms
Descriptor/Qualifier:
Acclimatization / physiology*
Adult
Cold Temperature
Cross-Over Studies
Humans
Hydrocortisone / analysis,  secretion*
Male
Oxygen Consumption
Saliva / metabolism*
Skating / physiology*
Temperature*
Chemical
Reg. No./Substance:
50-23-7/Hydrocortisone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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