Document Detail

Effect of prior heavy exercise on muscle deoxygenation kinetics at the onset of subsequent heavy exercise.
MedLine Citation:
PMID:  17242945     Owner:  NLM     Status:  MEDLINE    
This study examines the effect of prior heavy exercise on muscle deoxygenation kinetics at the onset of heavy-intensity cycling exercise. Ten young male adults (20 +/- 2 years) performed two repetitions of step transitions (6 min) from 35 W to heavy-intensity exercise preceded by either no warm-up or by a heavy-intensity exercise. VO2 was measured breath-by-breath, and muscle deoxygenation (HHb) and total hemoglobin (Hb(tot)) were monitored continuously by near-infrared spectroscopy. We used a two-exponential model to describe the VO2 kinetics and a mono-exponential model for the HHb kinetic. The parameters of the phase II VO2 kinetics (TD1 VO2, tau1 VO2 and A1 VO2) were unaffected by prior heavy exercise, while some parameters of local muscle deoxygenation kinetics were significantly faster (TD HHb: 7 +/- 2 vs. 5 +/- 2 s; P < 0.001, MRT HHb: 20 +/- 3 vs. 15+/- 4 s; P < 0.05). Blood lactate, heart rate and Hb(tot) values were significantly higher before the second bout of heavy exercise. These results collectively suggest that the prior heavy exercise probably increased muscle O2 availability and improved O2 utilization at the onset of a subsequent bout of heavy exercise.
A Marles; S Perrey; R Legrand; N Blondel; A Delangles; D Betbeder; P Mucci; F Prieur
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-01-23
Journal Detail:
Title:  European journal of applied physiology     Volume:  99     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-03-08     Completed Date:  2007-05-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  677-84     Citation Subset:  IM    
EA 3608 Physical activity, Sport and Health, Faculty of Sport Sciences and Physical Education, University of Lille, Lille, France.
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MeSH Terms
Anoxia / metabolism
Carbon Dioxide / blood
Data Interpretation, Statistical
Exercise / physiology*
Heart Rate / physiology
Hemoglobins / metabolism
Lactic Acid / blood
Muscle, Skeletal / metabolism*
Oxygen Consumption / physiology*
Spectroscopy, Near-Infrared
Reg. No./Substance:
0/Hemoglobins; 124-38-9/Carbon Dioxide; 50-21-5/Lactic Acid

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

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