Document Detail


Level ground and uphill cycling efficiency in seated and standing positions.
MedLine Citation:
PMID:  12370567     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: This study was designed to examine the effects of cycling position (seated or standing) during level-ground and uphill cycling on gross external efficiency (GE) and economy (EC). METHODS: Eight well-trained cyclists performed in a randomized order five trials of 6-min duration at 75% of peak power output either on a velodrome or during the ascent of a hill in seated or standing position. GE and EC were calculated by using the mechanical power output that was measured by crankset (SRM) and energy consumption by a portable gas analyzer (Cosmed K4b(2)). In addition, each subject performed three 30-s maximal sprints on a laboratory-based cycle ergometer or in the field either in seated or standing position. RESULTS: GE and EC were, respectively, 22.4 +/- 1.5% (CV = 5.6%) and 4.69 +/- 0.33 kJ x L(-1) (CV = 5.7%) and were not different between level seated, uphill seated, or uphill standing conditions. Heart rate was significantly ( < 0.05) higher in standing position. In the uphill cycling trials, minute ventilation was higher ( < 0.05) in standing than in seated position. The average 30-s power output was higher ( < 0.01) in standing (803 +/- 103 W) than in seated position (635 +/- 123 W) or on the stationary ergometer (603 +/- 81 W). CONCLUSION: Gradient or body position appears to have a negligible effect on external efficiency in field-based high-intensity cycling exercise. Greater short-term power can be produced in standing position, presumably due to a greater force developed per revolution. However, the technical features of the standing position may be one of the most determining factors affecting the metabolic responses.
Authors:
Grégoire P Millet; Cyrille Tronche; Nicolas Fuster; Robin Candau
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  34     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2002 Oct 
Date Detail:
Created Date:  2002-10-08     Completed Date:  2003-04-03     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1645-52     Citation Subset:  IM; S    
Affiliation:
UPRES-EA 2991 Sport, Performance, Santé, Faculté des Sciences du Sport, Montpellier, France. g.millet@staps.univ-montp1.fr
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Bicycling / physiology*
Ergometry
Exercise Test
Humans
Male
Oxygen Consumption / physiology
Physical Exertion / physiology*
Posture / physiology*
Pulmonary Gas Exchange

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


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