| Effects of a prior high-intensity knee-extension exercise on muscle recruitment and energy cost: a combined local and global investigation in humans. | |
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MedLine Citation:
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PMID: 19151077 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of a priming exercise bout on both muscle energy production and the pattern of muscle fibre recruitment during a subsequent exercise bout are poorly understood. The purpose of the present study was to determine whether a prior exercise bout which is known to increase O(2) supply and to induce a residual acidosis could alter energy cost and muscle fibre recruitment during a subsequent heavy-intensity knee-extension exercise. Fifteen healthy subjects performed two 6 min bouts of heavy exercise separated by a 6 min resting period. Rates of oxidative and anaerobic ATP production, determined with (31)P-magnetic resonance spectroscopy, and breath-by-breath measurements of pulmonary oxygen uptake were obtained simultaneously. Changes in muscle oxygenation and muscle fibre recruitment occurring within the quadriceps were measured using near-infrared spectroscopy and surface electromyography. The priming heavy-intensity exercise increased motor unit recruitment (P < 0.05) in the early part of the subsequent exercise bout but did not alter muscle energy cost. We also observed a reduced deoxygenation time delay, whereas the deoxygenation amplitude was increased (P < 0.01). These changes were associated with an increased oxidative ATP cost after approximately 50 s (P < 0.05) and a slight reduction in the overall anaerobic rate of ATP production (0.11 +/- 0.04 mM min(-1) W(-1) for bout 1 and 0.06 +/- 0.11 mM min(-1) W(-1) for bout 2; P < 0.05). We showed that a priming bout of heavy exercise led to an increased recruitment of motor units in the early part of the second bout of heavy exercise. Considering the increased oxidative cost and the unaltered energy cost, one could suggest that our results illustrate a reduced metabolic strain per fibre. |
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Authors:
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Gwenael Layec; Aurélien Bringard; Yann Le Fur; Christophe Vilmen; Jean-Paul Micallef; Stéphane Perrey; Patrick J Cozzone; David Bendahan |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-01-16 |
Journal Detail:
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Title: Experimental physiology Volume: 94 ISSN: 1469-445X ISO Abbreviation: Exp. Physiol. Publication Date: 2009 Jun |
Date Detail:
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Created Date: 2009-05-22 Completed Date: 2009-08-10 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9002940 Medline TA: Exp Physiol Country: England |
Other Details:
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Languages: eng Pagination: 704-19 Citation Subset: IM |
Affiliation:
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Centre de Résonance Magnétique Biologique et Médicale, UMR CNRS 6612, Faculté de Médecine de Marseille, Marseille, France. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adenosine Triphosphate
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metabolism Adult Aerobiosis Anaerobiosis Electromyography Energy Metabolism Exercise / physiology* Exercise Test Female Humans Knee Magnetic Resonance Spectroscopy Male Models, Biological Muscle Fibers, Skeletal / physiology Muscle, Skeletal / physiology* Oxygen Consumption Recruitment, Neurophysiological / physiology Spectroscopy, Near-Infrared |
| Chemical | |
Reg. No./Substance:
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56-65-5/Adenosine Triphosphate |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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