Delay in initiation and termination of muscle contraction, motor impairment, and physical disability in upper limb hemiparesis

John Chae, Guang Yang, Byung Kyu Park, Ihab Labatia

    Research output: Contribution to journalArticlepeer-review

    79 Citations (Scopus)

    Abstract

    The purpose of this study was to describe the relationship between the delay in initiation and termination of muscle contraction and clinical measures of motor impairment and physical disability in the affected upper limb of patients with hemiparesis. Electromyographic (EMG) activity of 26 long-term survivors of stroke was recorded during isometric wrist flexion and extension. Upper limb motor impairment and disability were assessed with the Fugl-Meyer motor assessment (FMA) and arm motor ability test (AMAT), respectively. Delay in initiation and termination of muscle contraction was significantly prolonged in the paretic arm. However, the delay was not significantly affected by stroke type, stroke level, side of hemiparesis, or presence of aphasia. Delay in initiation and termination of muscle contraction correlated significantly with FMA and AMAT. Abnormally delayed initiation and termination of muscle contraction may contribute to hemiparetic upper limb motor impairment and physical disability in hemiparetic patients.

    Original languageEnglish
    Pages (from-to)568-575
    Number of pages8
    JournalMuscle and Nerve
    Volume25
    Issue number4
    DOIs
    Publication statusPublished - 2002

    Keywords

    • Coordination
    • Disability
    • Hemiparesis
    • Motor control

    ASJC Scopus subject areas

    • Physiology
    • Clinical Neurology
    • Cellular and Molecular Neuroscience
    • Physiology (medical)

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