Document Detail

Acute heat exposure increases high-intensity performance during sprint cycle exercise.
MedLine Citation:
PMID:  17089157     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to investigate the effects of acute heat exposure at thermal balance on high-intensity performance during sprint cycle exercise. Nine healthy male subjects were tested in three different, well-controlled environments in an environmental chamber: T (22 degrees C, 65% RH), H1 (30 degrees C, 55% RH) and H2 (35 degrees C, 62% RH), each test being carried out on a different day following a randomized sequence. After 30 min of exposure to the set environment, subjects performed the 30-s sprint cycle exercise. Heart rate, rectal and skin temperatures were measured prior to exercise, at rest, before and after environmental exposure, and after exercise. There were no differences in subjects' core temperature or heart rate prior to exercise. However, skin temperature was significantly higher in hot trials compared with the control throughout the experimental session (P < 0.05). Peak power was significantly higher in the hot environments compared with the control. Mean power was higher only in H2 compared with T (P < 0.05). This difference in power output was the consequence of a faster pedaling cadence in the hot trials (P < 0.05). Plasma ammonia was higher in the hot trials versus control at 4 min post-sprint. No differences in blood lactate levels at 3 min post-sprint were observed between tests. The results of this study suggest that the exposure to hot environment caused an improvement in power output for a single 30-s sprint. This increase in power output was associated with an elevation in plasma ammonia suggestive of an increase in adenine nucleotide loss.
Ana Cristina R Lacerda; Fernando Gripp; Luiz Oswaldo C Rodrigues; Emerson Silami-Garcia; Cândido C Coimbra; Luciano S Prado
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-11-07
Journal Detail:
Title:  European journal of applied physiology     Volume:  99     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2007-02-12     Completed Date:  2007-05-29     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  87-93     Citation Subset:  IM    
Laboratory of Exercise Physiology, Department of Physical Education, School of Physical Education, Physical Therapy and Occupational Therapy, Federal University of Minas Gerais, AV. Antônio Carlos, 6627, Belo Horizonte, 31270-901, Minas Gerais, Brazil.
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MeSH Terms
Ammonia / blood
Bicycling / physiology*
Body Temperature
Exercise / physiology*
Heart Rate / physiology
Hot Temperature*
Physical Endurance / physiology*
Skin Temperature / physiology
Reg. No./Substance:

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