Document Detail


Effect of active warm-up on metabolism prior to and during intense dynamic exercise.
MedLine Citation:
PMID:  12471321     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: This study investigated whether active warm-up (AW) would increase muscle acetylcarnitine concentration before exercise, thereby reducing the reliance on nonoxidative ATP production during subsequent high-intensity exercise. METHODS: Six female subjects performed a 30-s sprint at 120% of their maximal power output on an electronically braked cycle ergometer 5 min after undertaking an active warm-up. To exclude any effect of muscle temperature (Tm) on metabolism, AW was compared with control (C), which involved passively heating the muscle to the same temperature as that achieved by active warm-up (37.1 +/- 0.3 vs 37.2 +/- 0.2 degrees C AW and C, respectively). RESULTS: Active warm-up significantly increased the concentration of acetylcarnitine from 4.5 +/- 1.5 mmol x kg(-1) dry muscle (dm)(-1) at rest to 9.4 +/- 1.6 mmol x kg dm(-1) before the onset of exercise. There was no change in acetylcarnitine concentration in C. During exercise the accumulation of muscle lactate was significantly less in AW compared with C (21.9 +/- 3.8 vs 34.3 +/- 2.3 mmol.kg dm, respectively). CONCLUSION: The main finding of this study was that there was less accumulation of blood and muscle lactate during intense dynamic exercise preceded by active warm-up, which could not be accounted for by a difference in T between trials immediately before the onset of exercise(m)
Authors:
Susan C Gray; Giuseppe Devito; Myra A Nimmo
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  34     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2002 Dec 
Date Detail:
Created Date:  2002-12-09     Completed Date:  2003-03-28     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:  2091-6     Citation Subset:  IM; S    
Affiliation:
Strathclyde Institute for Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom. s.gray@napier.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Acetylcarnitine / metabolism
Adenosine Triphosphate / metabolism
Analysis of Variance
Biological Markers / blood
Body Temperature / physiology
Catecholamines / blood
Creatinine / metabolism
Energy Metabolism / physiology*
Exercise / physiology*
Female
Heart Rate / physiology
Humans
Lactates / blood
Muscle, Skeletal / metabolism
Nootropic Agents / metabolism
Oxygen Consumption / physiology
Reference Values
Rest / physiology
Women's Health
Chemical
Reg. No./Substance:
0/Biological Markers; 0/Catecholamines; 0/Lactates; 0/Nootropic Agents; 14992-62-2/Acetylcarnitine; 56-65-5/Adenosine Triphosphate; 60-27-5/Creatinine

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


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