| Short-term high-intensity interval training improves phosphocreatine recovery kinetics following moderate-intensity exercise in humans. | |
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MedLine Citation:
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PMID: 19088770 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Previous studies have shown that high-intensity training improves biochemical markers of oxidative potential in skeletal muscle within a 2-week period. The purpose of this study was to examine the effect of short-term high-intensity interval training on the time constant () of phosphocreatine (PCr) recovery following moderate-intensity exercise, an in vivo measure of functional oxidative capacity. Seven healthy active subjects (age, 21 +/- 4 years; body mass, 69 +/- 11 kg) performed 6 sessions of 4-6 maximal-effort 30 s cycling intervals within a 2-week period, and 7 subjects (age, 24 +/- 5 years; body mass, 80 +/- 15 kg) served as controls. Prior to and following training, phosphorous-31 magnetic resonance spectroscopy (31P-MRS; GE 3T Excite System) was used to measure relative changes in high-energy phosphates and intracellular pH of the quadriceps muscles during gated dynamic leg-extension exercise (3 cycles of 90 s exercise and 5 min of rest). A monoexponential model was used to estimate the of PCr recovery. The of PCr recovery after leg-extension exercise was reduced by 14% with high-intensity interval training (pretraining, 43 +/- 14 s vs. post-training, 37 +/- 15 s; p < 0.05) with no change in the control group (44 +/- 12 s vs. 43 +/- 12 s, respectively; p > 0.05). These findings demonstrate that short-term high-intensity interval training is an effective means of increasing functional oxidative capacity in skeletal muscle. |
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Authors:
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Sean C Forbes; Jill M Slade; Ronald A Meyer |
Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural |
Journal Detail:
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Title: Applied physiology, nutrition, and metabolism = Physiologie appliquée, nutrition et métabolisme Volume: 33 ISSN: 1715-5312 ISO Abbreviation: - Publication Date: 2008 Dec |
Date Detail:
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Created Date: 2008-12-17 Completed Date: 2009-03-24 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101264333 Medline TA: Appl Physiol Nutr Metab Country: Canada |
Other Details:
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Languages: eng Pagination: 1124-31 Citation Subset: IM |
Affiliation:
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Department of Physiology, Michigan State University, East Landing, MI 48824, USA. sforbes@msu.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Bicycling Exercise / physiology* Female Humans Hydrogen-Ion Concentration Kinetics Magnetic Resonance Spectroscopy / methods Male Muscle, Skeletal / metabolism Oxygen Consumption / physiology Phosphocreatine / metabolism* Physical Endurance / physiology Physical Exertion / physiology* Reference Values Students Time Factors Young Adult |
| Grant Support | |
ID/Acronym/Agency:
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R01 AR043903/AR/NIAMS NIH HHS |
| Chemical | |
Reg. No./Substance:
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67-07-2/Phosphocreatine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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