| Effects of strength training on muscle fatigue mapping from surface EMG and blood metabolites. | |
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MedLine Citation:
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PMID: 20581711 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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PURPOSE: this study examined the effects of heavy resistance training on the relationships between power loss and surface EMG (sEMG) indices and blood metabolite concentrations on dynamic exercise-induced fatigue with the same relative load as in pretraining. METHODS: twelve trained subjects performed five sets consisting of 10 repetitions in the leg press, with 2 min of rest between sets before and after a strength training period. sEMG variables (the mean average voltage, the median spectral frequency, and the Dimitrov spectral index of muscle fatigue) from vastus medialis and lateralis muscles and metabolic responses (i.e., blood lactate, uric acid, and ammonia concentrations) were measured. RESULTS: the peak power loss after the posttraining protocol was greater (61%) than the decline observed in the pretraining protocol (46%). Similar sEMG changes were found for both protocols, whereas higher metabolic demand was observed during the posttraining exercise. The linear models on the basis of the relations found between power loss and changes in sEMG variables were significantly different between pretraining and posttraining, whereas the linear models on the basis of the relations between power loss and changes in blood metabolite concentrations were similar. CONCLUSIONS: linear models that use blood metabolites to map acute exercise-induced peak power changes were more accurate in detecting these changes before and after a short-term training period, whereas an attempt to track peak power loss using sEMG variables may fail after a strength training period. |
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Authors:
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Mikel Izquierdo; Miriam González-Izal; Ion Navarro-Amezqueta; Jose A L Calbet; Javier Ibañez; Armando Malanda; Fermin Mallor; Keijo Häkkinen; William J Kraemer; Esteban M Gorostiaga |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 43 ISSN: 1530-0315 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-01-18 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 303-11 Citation Subset: IM; S |
Affiliation:
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Studies, Research and Sport Medicine Center, Government of Navarra, Pamplona, Navarra, SPAIN. izquierdo@gmail.com |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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