| Velocity Loss as an Indicator of Neuromuscular Fatigue during Resistance Training. | |
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MedLine Citation:
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PMID: 21311352 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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PURPOSE:: To analyze the acute mechanical and metabolic response to resistance exercise protocols (REP) differing in the number of repetitions (R) performed in each set (S) with respect to the maximum predicted number (P). METHODS:: Over twenty-one exercise sessions separated by 48-72 h, eighteen strength-trained males, ten in bench press (BP) and eight in squat (SQ) performed: 1) a progressive test for 1RM and load-velocity profile determination; 2) tests of maximal number of repetitions to failure: 12RM, 10RM, 8RM, 6RM, 4RM; 3) 15 REP [SxR(P): 3x6(12), 3x8(12), 3x10(12), 3x12(12), 3x6(10), 3x8(10), 3x10(10), 3x4(8), 3x6(8), 3x8(8), 3x3(6), 3x4(6), 3x6(6), 3x2(4), 3x4(4)], with 5 min inter-set rests. Kinematic data was registered by a linear velocity transducer. Blood lactate and ammonia were measured pre- and post-exercise. RESULTS:: Both mean repetition velocity loss over 3 sets, loss of velocity pre-post exercise against the 1 m/s load and CMJ height loss (SQ group) were significant for all REP and highly correlated to each other (r = 0.91-0.97). Velocity loss was significantly greater for BP compared to SQ and strongly correlated to peak post-exercise lactate (r = 0.93-0.97) for both SQ and BP. Unlike lactate, ammonia showed a curvilinear response to loss of velocity, only increasing above resting levels when R was at least 2 repetitions higher than 50% of P. CONCLUSION:: The velocity loss and metabolic stress clearly differs when manipulating the number of repetitions actually performed in each training set. The high correlations found between mechanical (velocity and CMJ height losses) and metabolic (lactate, ammonia) measures of fatigue support the validity of using velocity loss to objectively quantify neuromuscular fatigue during resistance training. |
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Authors:
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Luis Sánchez-Medina; Juan José González-Badillo |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-8 |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: - ISSN: 1530-0315 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-2-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1Faculty of Sport, Pablo de Olavide University, Seville, Spain. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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