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Adjustments in motor unit properties during fatiguing contractions after training

2012Journal article Open access
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dc.contributor.authorVila-Chã, Carolina
dc.contributor.authorFalla, Deborah
dc.contributor.authorVelhote, Miguel C.
dc.contributor.authorFarina, Dario
dc.date.accessioned2014-06-12T11:00:05Z
dc.date.available2014-06-12T11:00:05Z
dc.date.issued2012
dc.description.abstractThe objective of the study was to investigate the effect of strength and endurance training on muscle fiber membrane properties and discharge rates of low-threshold motor units of the vasti muscles during fatiguing contractions. Methods: Twenty-five sedentary healthy men (age (mean T SD) = 26.3 T 3.9 yr) were randomly assigned to one of three groups: strength training, endurance training, or a control group. Conventional endurance and strength training was performed 3 dIwkj1, during a period of 6 wk. Motor unit conduction velocity and EMG amplitude of the vastus medialis obliquus and lateralis muscles and biceps femoris were measured during sustained isometric knee extensions at 10% and 30% of the maximum voluntary contraction before and immediately after training. Results: After 6 wk of training, the reduction in motor unit conduction velocity during the sustained contractions at 30% of the maximum voluntary force occurred at slower rates compared with baseline (P G 0.05). However, the rate of decrease was lower after endurance training compared with strength training (P G 0.01). For all groups, motor unit discharge rates declined during the sustained contraction (P G 0.001), and their trend was not altered by training. In addition, the biceps femoris–vasti coactivation ratio declined after the endurance training. Conclusions: Short-term strength and endurance training induces alterations of the electrophysiological membrane properties of the muscle fiber. In particular, endurance training lowers the rate of decline of motor unit conduction velocity during sustained contractions more than strength trainingpor
dc.identifier.citationVila-Chã, Carolina; Falla, Deborah; Correia, Miguel Velhote; Farina, Dario (2012). Adjustments in motor unit properties during fatiguing contractions after training. Medicine and Science in Sports and Exercise. ISSN 0195-9131. 44:4, p. 616-624
dc.identifier.doi10.1249/MSS.0b013e318235d81d
dc.identifier.issn0195-9131
dc.identifier.urihttp://hdl.handle.net/10198/9691
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherLippincott Williams & Wilkinspor
dc.subjectEMGpor
dc.subjectFatiguepor
dc.subjectSubmaximal contractionspor
dc.subjectEndurance trainingpor
dc.subjectStrength trainingpor
dc.titleAdjustments in motor unit properties during fatiguing contractions after trainingpor
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/267888
oaire.citation.titleMedicine and Science in Sports and Exercisepor
oaire.fundingStreamFP7
person.familyNameVila-Chã
person.givenNameCarolina
person.identifier.orcid0000-0003-3891-357X
person.identifier.scopus-author-id35079532100
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication2fd32019-b368-4f10-a577-a5b651c044c2
relation.isAuthorOfPublication.latestForDiscovery2fd32019-b368-4f10-a577-a5b651c044c2
relation.isProjectOfPublication475342be-927b-45a9-875c-c4b4bfd18989
relation.isProjectOfPublication.latestForDiscovery475342be-927b-45a9-875c-c4b4bfd18989

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