Document Detail


Physiological responses to cycling for 60 minutes at maximal lactate steady state.
MedLine Citation:
PMID:  10953063     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Changes in physiological variables during a 60-min continuous test at maximal lactate steady state (MLSS) were studied using highly conditioned cyclists (1 female and 9 males, aged 28.3 +/- 8.1 years). To determine power at MLSS, we tested at 8-min increments and interpolated the power corresponding to a blood lactate value of 4 mmol/L. During the subsequent 60-min exercise at MLSS, we observed a sequential increase of physiological parameters, in contrast to stable blood lactate. Heart rate drifted upward from beginning to end of exercise. This became statistically significant after 30 min. From 10-60 min of exercise, a change of +12.6 +/- 3.2 bpm was noted. Significant drift was seen after 30 min for the respiratory exchange ratio, after 40 min for the rate of perceived exertion using the Borg scale, and after 50 min for % VO(2)max/kg and minute ventilation. This slow component of VO(2)max may be the result of higher recruitment of type II fibers.
Authors:
C Lajoie; L Laurencelle; F Trudeau
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Canadian journal of applied physiology = Revue canadienne de physiologie appliquée     Volume:  25     ISSN:  1066-7814     ISO Abbreviation:  Can J Appl Physiol     Publication Date:  2000 Aug 
Date Detail:
Created Date:  2001-01-26     Completed Date:  2002-02-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9306274     Medline TA:  Can J Appl Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  250-61     Citation Subset:  IM    
Affiliation:
Département des sciences de l' activité physique, Université du Québec à Trois-Riviéres, Trois-Riviéres, Québec.
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Bicycling / physiology*
Exercise Test
Exercise Tolerance
Female
Heart Rate / physiology
Humans
Lactic Acid / blood*
Male
Middle Aged
Oxygen Consumption / physiology
Physical Exertion / 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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