| Effect of Low Recumbent Angle on Cycling Performance, Fatigue and V˙O2 Kinetics. | |
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MedLine Citation:
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PMID: 23135372 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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PURPOSE: To examine the effect of the degree of inclination from upright to supine postures on cycling performance, fatigue and oxygen uptake (V˙O2) kinetics. METHODS: In experiment 1 ten subjects performed graded and fatigue (exhaustive constant-load heavy exercise with 10s all-out efforts interspersed every min) tests at four cycling postures: upright, 30°R, 15°R and supine. In experiment 2, nine different subjects performed two bouts of constant-load heavy exercise in the same four cycling postures. Bout one was brought to failure and the second bout was limited to 6 min, so that the breath-by-breath V˙O2 data from the first 6 min of each bout were averaged and curve-fit. RESULTS: The time sustained during the graded test was significantly shorter in the supine compared with the other 3 postures and also shorter in the 15°R compared with the upright. The rate of fatigue was higher in the supine compared with the other three postures and normalised electromyographic activities of three leg muscles at end-exercise were larger in the supine (and in some cases 15°R) compared with upright posture. The time sustained (min) during high-intensity constant-load cycling was significantly longer during upright (12.8±5.3) and 30°R (14.2±6.1) compared with 15°R (8.5±1.7) and supine (6.8±2.0) postures, but the amplitudes of the slow component of the V˙O2 response (L.min) were larger during 15°R (0.57±0.10) and supine (0.61±0.15) compared with 30°R (0.39±0.12), and also larger in the supine than upright (0.43±0.13) postures. Inert gas rebreathing analysis revealed similar cardiac output responses at 60s into the exercise among postures. CONCLUSION: Lowering the recumbent angle to 15° resulted in shorter performance, larger fatigue and altered V˙O2 kinetics. |
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Authors:
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Mikel Egaña; David Columb; Steven O'Donnell |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-11-6 |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: - ISSN: 1530-0315 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2012 Nov |
Date Detail:
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Created Date: 2012-11-8 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Physiology, Trinity College Dublin, Dublin 2, Ireland.1. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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