| Effect of previous exhaustive exercise on metabolism and fatigue development during intense exercise in humans. | |
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MedLine Citation:
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PMID: 19793216 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The present study examined how metabolic response and work capacity are affected by previous exhaustive exercise. Seven subjects performed an exhaustive cycle exercise ( approximately 130%-max; EX2) after warm-up (CON) and 2 min after an exhaustive bout at a very high (VH; approximately 30 s), high (HI; approximately 3 min) or low (LO; approximately 2 h) intensity. Compared with CON, performance during EX2 was reduced (P<0.05) more in HI and LO than in VH (61+/-4% and 68+/-3% vs 35+/-4%). The muscle glycogen before EX2 was lower (P<0.05) in LO than in HI and VH, but the muscle glycogen utilization rates during EX2 were not different. Muscle glycogen concentration before EX2 was related (P<0.05) to the mean rate of muscle glycogen utilization during EX2 in HI and VH, and the mean rate of muscle lactate accumulation in LO. In HI, muscle pH before EX2 was lower (P<0.05) compared with VH and LO, but the same in HI and VH at the end of EX2. In HI, muscle pH before and after EX2 was inversely related (P<0.05) to the decrease in EX2 performance. Thus, muscle glycogen availability and low muscle pH do not per se control but appear to affect the rate of glycogenolysis/glycolysis and fatigue development during a repeated high-intensity exercise lasting 1/2-2 min. |
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Authors:
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F M Iaia; J Perez-Gomez; N Nordsborg; J Bangsbo |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-09-28 |
Journal Detail:
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Title: Scandinavian journal of medicine & science in sports Volume: 20 ISSN: 1600-0838 ISO Abbreviation: Scand J Med Sci Sports Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-07-26 Completed Date: 2010-11-08 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9111504 Medline TA: Scand J Med Sci Sports Country: Denmark |
Other Details:
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Languages: eng Pagination: 619-29 Citation Subset: IM |
Affiliation:
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Department of Exercise and Sport Sciences, Copenhagen Muscle Research Centre, University of Copenhagen, Copenhagen, Denmark. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Athletic Performance / physiology Energy Metabolism / physiology* Exercise / physiology* Fatigue / etiology* Humans Male Muscle, Skeletal / metabolism Oxygen Consumption / physiology Physical Exertion / physiology* Young Adult |
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