Document Detail


Muscle energetics in short-term training during hypoxia in elite combination skiers.
MedLine Citation:
PMID:  7851364     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Four well-trained combination skiers were studied through pre- and post-training for the effects of short-term intermittent training during hypoxia on muscle energetics during submaximal exercise as measured by Phosphorus-31 nuclear magnetic resonance and maximal aerobic power (VO2max). The hypoxia and training in the cold was conducted in a hypobaric chamber and comprised 60-min aerobic exercise (at an intensity equivalent to the blood lactate threshold), using a cycle ergometer or a treadmill twice a day for 4, consecutive days at 5 degrees C, in conditions equivalent to an altitude of 2000 m (593 mm Hg). No change in VO2max was observed over the training period, while in the muscle energetics during submaximal exercise, the values of phosphocreatine/(phosphocreatine+inorganic phosphate) and intracellular pH were found to be significantly increased by training during hypoxia. During recovery, the time constant of phosphocreatine was found to have been significantly reduced [pre, 27.9 (SD 6.7) s; post, 22.5 (SD 4.7) s, P < 0.01]. The observed inhibition of phosphocreatine as well as that of intracellular pH changes after training during hypoxia and quicker recovery of phosphocreatine in submaximal exercise tests, may indicate improved oxidative capacity (i.e. a high adenosine 5'-triphosphate formation rate) despite the short-term hypoxia training.
Authors:
S Kuno; M Inaki; K Tanaka; Y Itai; K Asano
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  69     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1994  
Date Detail:
Created Date:  1995-03-13     Completed Date:  1995-03-13     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  301-4     Citation Subset:  IM; S    
Affiliation:
Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Japan.
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MeSH Terms
Descriptor/Qualifier:
Adult
Altitude*
Anoxia / metabolism*
Blood Gas Analysis
Cold Temperature
Humans
Hydrogen-Ion Concentration
Intracellular Fluid / metabolism
Lactates / blood
Lactic Acid
Magnetic Resonance Spectroscopy
Muscle, Skeletal / metabolism*
Physical Exertion / physiology*
Skiing / physiology*
Chemical
Reg. No./Substance:
0/Lactates; 50-21-5/Lactic Acid

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


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