| Early neural responses to strength training. | |
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MedLine Citation:
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PMID: 21551014 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The neural adaptations that accompany strength training have yet to be fully determined. Here we sought to address this topic by testing the idea that strength training might share similar mechanisms with some forms of motor learning. Since ballistic motor learning is accompanied by a shift in muscle twitches induced by transcranial magnetic stimulation (TMS) towards the training direction, we sought to investigate if these changes also occur after single isometric strength training sessions with various contraction duration and rate of force development characteristics (i.e. brief or sustained ballistic contractions or slow, sustained contractions). Twitch force resultant vectors and motor evoked potentials (MEPs) induced by TMS were measured before and after single sessions of strength training involving the forearm muscles. Participants (n=12) each performed three training protocols (each consisting 4 sets of 10 repetitions) and served as their own control in a counter balanced order. All three training protocols caused a significant (p<0.05) shift in TMS-induced twitch force resultant vectors towards the training direction, followed by a gradual shift back towards the pre-training direction. The strongest effect was found when training involved both ballistic and sustained force components. There were no large or consistent changes in the direction of twitches evoked by motor nerve stimulation for any of the three training protocols. We suggest that these early neural responses to strength training, which share similar corticospinal changes to motor learning, might reflect an important process that precedes more long-term neural adaptation that ultimately enhance strength. |
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Authors:
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Victor Selvarajah Selvanayagam; Stephan Riek; Timothy John Carroll |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-5-5 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: - ISSN: 1522-1601 ISO Abbreviation: - Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-5-9 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1The University of Queensland. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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