| Effects of air ventilation during stationary exercise testing. | |
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MedLine Citation:
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PMID: 15083366 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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R Van Schuylenbergh; B Vanden Eynde; P Hespel |
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Publication Detail:
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Type: Clinical Trial; Controlled Clinical Trial; Journal Article Date: 2004-04-09 |
Journal Detail:
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Title: European journal of applied physiology Volume: 92 ISSN: 1439-6319 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2004 Jul |
Date Detail:
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Created Date: 2004-07-08 Completed Date: 2005-01-25 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 263-6 Citation Subset: IM |
Affiliation:
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Exercise Physiology and Biomechanics Laboratory, Department of Kinesiology, Faculty of Physical Education and Physiotherapy, K.U. Leuven, Tervuursevest 101, 3001, Leuven, Belgium. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological
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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:
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50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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