ORGANIZING PRINCIPLES FOR VOLUNTARY MOVEMENT - EXTENDING SINGLE-JOINT RULES

dc.creatorALMEIDA, GL
dc.creatorHONG, DA
dc.creatorCORCOS, D
dc.creatorGOTTLIEB, GL
dc.date1995
dc.dateOCT
dc.date2014-07-30T18:03:42Z
dc.date2015-11-26T17:48:36Z
dc.date2014-07-30T18:03:42Z
dc.date2015-11-26T17:48:36Z
dc.date.accessioned2018-03-29T00:31:31Z
dc.date.available2018-03-29T00:31:31Z
dc.identifierJournal Of Neurophysiology. Amer Physiological Soc, v. 74, n. 4, n. 1374, n. 1381, 1995.
dc.identifier0022-3077
dc.identifierWOS:A1995TA40100002
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/69744
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/69744
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1289148
dc.description1. Four subjects performed fast flexions of the elbow or shoulder over three different distances. Elbow flexions were performed both in a horizontal, single-degree-of-freedom manipulandum and in a sagittal plane with the limb unconstrained. Shoulder flexions were only performed in the sagittal plane by the unconstrained limb. We simultaneously recorded kinematic and electromyographic (EMG) patterns at the ''focal'' joint, that which the subject intentionally flexed, and at the other, ''nonfocal'' subject had been instructed to not flex. 2. Comparisons of the elbow EMG patterns across tasks show that agonist and antagonist muscles were similar in pattern but not size, reflecting the net muscle torque patterns. Comparisons at the shoulder also revealed similar EMG patterns across tasks that reflected net muscle torques. 3. Comparisons of EMG patterns across joints show that elbow and shoulder flexors behaved similarly. This was not true of the extensors. The triceps EMG burst was delayed for longer distances but the posterior deltoid had an early, distance-invariant onset. 4. Similarities in EMG reflect torque demands required at the focal joint to produce flexion and at the nonfocal joint to reduce extension induced by dynamic interactions with the focal, flexing joint. These similarities appear despite very different kinematic intentions and outcomes. This argues against a strong role for length-sensitive reflexes in their generation. 5. These results support the hypothesis that movements are controlled by muscle activation patterns that are planned for the expected torque requirements of the task. This general rule is true whether we are performing single-joint or multiple-joint movements, with or without external constraints. The similarities between single-joint and multijoint movement control may be a consequence of ontogenetic development of multijoint movement strategies that prove useful and are therefore also expressed under the constrained conditions of specialized tasks such as those performed in single-joint manipulanda.
dc.description74
dc.description4
dc.description1374
dc.description1381
dc.languageen
dc.publisherAmer Physiological Soc
dc.publisherBethesda
dc.relationJournal Of Neurophysiology
dc.relationJ. Neurophysiol.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectSpeed-insensitive Strategy
dc.subjectArm Movements
dc.subjectLimb Dynamics
dc.subjectAmplitude
dc.subjectPatterns
dc.subjectFreedom
dc.subjectPlanar
dc.subjectWork
dc.titleORGANIZING PRINCIPLES FOR VOLUNTARY MOVEMENT - EXTENDING SINGLE-JOINT RULES
dc.typeArtículos de revistas


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