Control of single-joint movements with a reversal

dc.creatorPaulino, RG
dc.creatordos Santos, MVR
dc.creatorLatash, ML
dc.creatorAlmeida, GL
dc.date2005
dc.dateAUG
dc.date2014-11-17T00:35:51Z
dc.date2015-11-26T16:33:15Z
dc.date2014-11-17T00:35:51Z
dc.date2015-11-26T16:33:15Z
dc.date.accessioned2018-03-28T23:15:02Z
dc.date.available2018-03-28T23:15:02Z
dc.identifierJournal Of Electromyography And Kinesiology. Elsevier Sci Ltd, v. 15, n. 4, n. 406, n. 417, 2005.
dc.identifier1050-6411
dc.identifierWOS:000230226300009
dc.identifier10.1016/j.jelekin.2004.09.004
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/57073
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/57073
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/57073
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1270785
dc.descriptionWe studied the kinematic and electromyographic (EMG) patterns during single-joint elbow flexion movements with a reversal and tested two hypotheses. First, that the amplitude of the second phase of the movement (M-2) will be controlled by two different means, a drop in the second flexor burst for a small M-2 and an increase in the integral of the extensor burst for larger M-2. Second, based on the muscle stretch-shortening cycle (SSC), that movements reversing without a delay will show a larger extensor burst, as compared to movements that reverse after a delay. Changes in EMG patterns with M, amplitude supported the first hypothesis and could be interpreted within the framework of the equilibrium-point hypothesis. The observations also corroborate a hypothesis that discrete movements represent outcomes of an oscillatory control process stopped at a particular phase. In Experiment-2, even the shortest delay at the target led to a significantly larger extensor burst. However, there were no differences in the peak velocity of M-2 with and without the delay. These observations do not support a major role of stretch reflexes in the SSC effects during such movements. However, they are compatible with the idea of peripheral factors, such as peripheral muscle and tendon elasticity, playing a major potentiating role in the SSC. (c) 2004 Elsevier Ltd. All rights reserved.
dc.description15
dc.description4
dc.description406
dc.description417
dc.languageen
dc.publisherElsevier Sci Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationJournal Of Electromyography And Kinesiology
dc.relationJ. Electromyogr. Kinesiol.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectmotor control
dc.subjectreversal
dc.subjectsingle-joint
dc.subjectelectromyography
dc.subjecthuman
dc.subjectSpeed-insensitive Strategy
dc.subjectOrganizing Principles
dc.subjectInertial Load
dc.subjectVoluntary Movements
dc.subjectRapid Movements
dc.subjectMotor Control
dc.subjectPatterns
dc.subjectMuscle
dc.subjectDirection
dc.titleControl of single-joint movements with a reversal
dc.typeArtículos de revistas


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