Modular Organization of Exploratory Force Development Under Isometric Conditions in the Human Arm.

MedStar author(s):
Citation: Journal of Motor Behavior. 51(1):83-99, 2019.PMID: 29384438Institution: MedStar National Rehabilitation NetworkForm of publication: Journal ArticleMedline article type(s): Journal ArticleSubject headings: *Arm/ph [Physiology] | *Isometric Contraction/ph [Physiology] | *Muscle, Skeletal/ph [Physiology] | *Psychomotor Performance/ph [Physiology] | Adult | Electromyography | Humans | MaleYear: 2019ISSN:
  • 0022-2895
Name of journal: Journal of motor behaviorAbstract: Muscle coordination of isometric force production can be explained by a smaller number of modules. Variability in force output, however, is higher during exploratory/transient force development phases than force maintenance phase, and it is not clear whether the same modular structure underlies both phases. In this study, eight neurologically-intact adults isometrically performed target force matches in 54 directions at hands, and electromyographic (EMG) data from eight muscles were parsed into four sequential phases. Despite the varying degree of motor complexity across phases (significant between-phase differences in EMG-force correlation, angular errors, and between-force correlations), the number/composition of motor modules were found equivalent across phases, suggesting that the CNS systematically modulated activation of the same set of motor modules throughout sequential force development.All authors: Lee SW, Roh J, Wilger KDOriginally published: Journal of Motor Behavior. :1-17, 2018 Jan 31Fiscal year: FY2018FY2019Digital Object Identifier: Date added to catalog: 2018-02-20
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Journal Article MedStar Authors Catalog Article 29384438 Available 29384438

Muscle coordination of isometric force production can be explained by a smaller number of modules. Variability in force output, however, is higher during exploratory/transient force development phases than force maintenance phase, and it is not clear whether the same modular structure underlies both phases. In this study, eight neurologically-intact adults isometrically performed target force matches in 54 directions at hands, and electromyographic (EMG) data from eight muscles were parsed into four sequential phases. Despite the varying degree of motor complexity across phases (significant between-phase differences in EMG-force correlation, angular errors, and between-force correlations), the number/composition of motor modules were found equivalent across phases, suggesting that the CNS systematically modulated activation of the same set of motor modules throughout sequential force development.

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