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Effect of Low Recumbent Angle on Cycling Performance, Fatigue and V˙O2 Kinetics.
MedLine Citation:
PMID:  23135372     Owner:  NLM     Status:  Publisher    
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.
Mikel Egaña; David Columb; Steven O'Donnell
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-6
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Physiology, Trinity College Dublin, Dublin 2, Ireland.1.
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