| Muscle metabolic status and acid-base balance during 10-s work:5-s recovery intermittent and continuous exercise. | |
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MedLine Citation:
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PMID: 22604889 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Glen R Belfry; Graydon H Raymer; Gregory D Marsh; Donald H Paterson; R Terry Thompson; Scott G Thomas |
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Publication Detail:
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Type: Journal Article Date: 2012-05-17 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 113 ISSN: 1522-1601 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2012 Aug |
Date Detail:
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Created Date: 2012-08-02 Completed Date: 2013-01-08 Revised Date: 2013-04-26 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 410-7 Citation Subset: IM |
Affiliation:
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University of Western Ontario, London, Ontario, Canada. gbelfry@uwo.ca |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acid-Base Equilibrium
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physiology* Adolescent Adult Exercise / physiology* Humans Isotonic Contraction / physiology Male Muscle Strength / physiology Muscle, Skeletal / metabolism* Oxygen Consumption / physiology Phosphocreatine / analysis, physiology Young Adult |
| Chemical | |
Reg. No./Substance:
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67-07-2/Phosphocreatine |
| Comments/Corrections | |
Erratum In:
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J Appl Physiol. 2013 Mar 15;114(6):831 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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