Document Detail

Muscle metabolic status and acid-base balance during 10-s work:5-s recovery intermittent and continuous exercise.
MedLine Citation:
PMID:  22604889     Owner:  NLM     Status:  MEDLINE    
Gastrocnemius muscle phosphocreatine ([PCr]) and hydrogen ion ([H(+)]) were measured using (31)P-magnetic resonance spectroscopy during repeated bouts of 10-s heavy-intensity (HI) exercise and 5-s rest compared with continuous (CONT) HI exercise. Recreationally active male subjects (n = 7; 28 yr ± 9 yr) performed on separate occasions 12 min of isotonic plantar flexion (0.75 Hz) CONT and intermittent (INT; 10-s exercise, 5-s rest) exercise. The HI power output in both CONT and INT was set at 50% of the difference between the power output associated with the onset of intracellular acidosis and peak exercise determined from a prior incremental plantar flexion protocol. Intracellular concentrations of [PCr] and [H(+)] were calculated at 4 s and 9 s of the work period and at 4 s of the rest period in INT and during CONT exercise. [PCr] and [H(+)] (mean ± SE) were greater at 4 s of the rest periods vs. 9 s of exercise over the course of the INT exercise bout: [PCr] (20.7 mM ± 0.6 vs. 18.7 mM ± 0.5; P < 0.01); [H(+)] (370 nM ± 13.50 vs. 284 nM ± 13.6; P < 0.05). Average [H(+)] was similar for CONT vs. INT. We therefore suggest that there is a glycolytic contribution to ATP recovery during the very short rest period (<5 s) of INT and that the greater average power output of CONT did not manifest in greater [H(+)] and greater glycolytic contribution compared with INT exercise.
Glen R Belfry; Graydon H Raymer; Gregory D Marsh; Donald H Paterson; R Terry Thompson; Scott G Thomas
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Publication Detail:
Type:  Journal Article     Date:  2012-05-17
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  113     ISSN:  1522-1601     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-08-02     Completed Date:  2013-01-08     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  410-7     Citation Subset:  IM    
University of Western Ontario, London, Ontario, Canada.
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MeSH Terms
Acid-Base Equilibrium / physiology*
Exercise / physiology*
Isotonic Contraction / physiology
Muscle Strength / physiology
Muscle, Skeletal / metabolism*
Oxygen Consumption / physiology
Phosphocreatine / analysis,  physiology
Young Adult
Reg. No./Substance:
Erratum In:
J Appl Physiol. 2013 Mar 15;114(6):831

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