Document Detail


Effects of air ventilation during stationary exercise testing.
MedLine Citation:
PMID:  15083366     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The impact of air ventilation on performance and physiological responses during stationary exercise in the laboratory was studied. Fourteen well-trained cyclists performed three exercise tests on a cycle ergometer, each separated by a 1-week interval. The first test was a graded test to determine the power output corresponding with the 4-mmol l(-1) lactate level. Tests 2 and 3 were 30-min constant-load tests at a power output corresponding with this 4-mmol l(-1) lactate threshold. One constant-load test was performed in the absence (NAV), whilst the other was performed in the presence (AV) of air ventilation (3 m s(-1)). During the constant-load tests, heart rate, tympanic temperature, blood lactate concentration and oxygen uptake (VO2) were measured at 10-min intervals and at the end of the test. Differences between the two test conditions were evaluated using paired t-tests. During NAV, 12 subjects interrupted the test due to premature exhaustion (exercise duration <30 min), versus only seven in AV ( P<0.05). At the end of the test tympanic temperature was 35.9 (0.2) degrees C in AV and was higher in NAV [36.7 (0.2) degrees C, P<0.05]. Exercise heart rate increased at a faster rate during NAV [+2.2 (0.3) beats min(-1)] than during AV [+1.5 (0.2) beats min(-1), P<0.05]. Blood lactate concentration and VO2 were similar between conditions. Air ventilation is essential to prevent an upward shift in the lactate:heart rate as well as the power output:heart rate relationship during laboratory exercise testing and indoor exercise training.
Authors:
R Van Schuylenbergh; B Vanden Eynde; P Hespel
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Publication Detail:
Type:  Clinical Trial; Controlled Clinical Trial; Journal Article     Date:  2004-04-09
Journal Detail:
Title:  European journal of applied physiology     Volume:  92     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2004 Jul 
Date Detail:
Created Date:  2004-07-08     Completed Date:  2005-01-25     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:  263-6     Citation Subset:  IM    
Affiliation:
Exercise Physiology and Biomechanics Laboratory, Department of Kinesiology, Faculty of Physical Education and Physiotherapy, K.U. Leuven, Tervuursevest 101, 3001, Leuven, Belgium.
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology
Adolescent
Adult
Air Movements
Body Temperature Regulation / physiology
Energy Transfer / physiology*
Exercise / physiology*
Exercise Test / methods*
Heart Rate / physiology
Humans
Lactic Acid / blood
Oxygen Consumption / physiology
Physical Exertion / physiology*
Task Performance and Analysis
Ventilation / methods*
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid

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


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