| Exercise performance and VO2 kinetics during upright and recumbent high-intensity cycling exercise. | |
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MedLine Citation:
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PMID: 20386919 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study investigated cycling performance and oxygen uptake V(O)₂kinetics between upright and two commonly used recumbent (R) postures, 65 degrees R and 30 degrees R. On three occasions, ten young active males performed three bouts of high-intensity constant-load (85% peak-workload achieved during a graded test) cycling in one of the three randomly assigned postures (upright, 65 degrees R or 30 degrees R). The first bout was performed to fatigue and second and third bouts were limited to 7 min. A subset of seven subjects performed a final constant-load test to failure in the supine posture. Exercise time to failure was not altered when the body inclination was lowered from the upright (13.1 +/- 4.5 min) to 65 degrees R (10.5 +/- 2.7 min) and 30 degrees R (11.5 +/- 4.6 min) postures; but it was significantly shorter in the supine posture (5.8 +/- 2.1 min) when compared with the three inclined postures. Resulting kinetic parameters from a tri-exponential analysis of breath-by-breath V(O)₂data during the first 7 min of exercise were also not different between the three inclined postures. However, inert gas rebreathing analysis of cardiac output revealed a greater cardiac output and stroke volume in both recumbent postures compared with the upright posture at 30 s into the exercise. These data suggest that increased cardiac function may counteract the reduction of hydrostatic pressure from upright approximately 25 mmHg; to 65 degrees R approximately 22 mmHg; and 30 degrees R approximately 18 mmHg such that perfusion of active muscle presumably remains largely unchanged, and also therefore, V(O)₂kinetics and performance during high-intensity cycling. |
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Authors:
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Mikel Egaña; Damien O'Riordan; Stuart A Warmington |
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Publication Detail:
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Type: Comparative Study; Journal Article; Randomized Controlled Trial Date: 2010-04-13 |
Journal Detail:
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Title: European journal of applied physiology Volume: 110 ISSN: 1439-6327 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-12 Completed Date: 2010-12-13 Revised Date: 2011-01-13 |
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: 39-47 Citation Subset: IM |
Affiliation:
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Department of Physiology, Trinity College Dublin, Dublin 2, Ireland. megana@tcd.ie |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological Bicycling* Cardiac Output Exercise* Exercise Test Heart Rate Humans Hydrostatic Pressure Kinetics Male Muscle Contraction* Muscle Fatigue Muscle, Skeletal / metabolism* Oxygen / metabolism* Oxygen Consumption* Posture* Stroke Volume Supine Position Young Adult |
| Chemical | |
Reg. No./Substance:
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7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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