Document Detail


Effects of cycling alone or in a sheltered position on subsequent running performance during a triathlon.
MedLine Citation:
PMID:  10211859     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: The purpose of this study was to compare the responses during a triathlon in which cycling was performed alone, as well as in a drafting position. METHODS: Eight male triathletes of international level performed a sprint-distance triathlon (0.75-km swim, 20-km bike, 5-km run) on two different occasions, one completely alone (TA), the other as a drafter during the bike leg of the event (TD). The speed during drafted cycling remained at all times identical to the no-draft situation. RESULTS: The results revealed that expiratory flow (VE), oxygen uptake (VO2), heart rate (HR), and blood lactate concentrations ([La-]) were significantly lower when drafting on the bike as opposed to biking alone (112.1 vs. 162.2 L x min(-1), 55.2 vs. 64.2 mL x min(-1) x kg(-1), 155 vs. 166.8 beats x min(-1), and 4.0 vs. 8.4 mmol x L(-1), respectively). The results also showed that running after biking in a drafting situation (for similar bike speeds) significantly improved the running speed compared with that of the no-draft modality (17.8 vs. 17.1 km x h(-1)). Furthermore, VE, VO2, HR, and [La-] were significantly higher during TD run compared with TA run (161.6 vs. 141.4 L x min(-1), 70.9 vs. 67.1 mL x min(-1) x kg(-1), 175.3 vs. 167.98 beats x min(-1), and 8.1 vs. 7.6 mmol x L(-1), respectively). CONCLUSIONS: These results showed that drafting allows triathletes to save significantly on energy during the bike leg of a triathlon and creates the conditions for an improved running performance, with higher benefits for the strong runners.
Authors:
C Hausswirth; D Lehénaff; P Dréano; K Savonen
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  31     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  1999 Apr 
Date Detail:
Created Date:  1999-06-08     Completed Date:  1999-06-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  599-604     Citation Subset:  IM; S    
Affiliation:
Laboratoire de Biomécanique et de Physiologie, Institut National du Sport et de L'Education Physique, Paris, France.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Bicycling / physiology*
Humans
Lactic Acid / blood
Male
Oxygen Consumption
Physical Endurance / physiology*
Prospective Studies
Pulmonary Gas Exchange
Running / physiology*
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid

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


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