Abnormal joint torque patterns in the paretic upper limb of subjects with hemiparesis

Julius P A Dewald*, Randall F. Beer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

240 Scopus citations

Abstract

This study presents the results of a novel paradigm for characterizing abnormal coordination in subjects with hemiparesis. Subjects generated maximum voluntary torques (MVTs) isometrically in four randomly ordered blocks consisting of elbow flexion/extension, shoulder flexion/extension, shoulder abduction/adduction, and shoulder external/internal rotation. A 6-degree-of-freedom (DOF) load cell was used to measure torques in secondary DOFs at the elbow and shoulder, as well as in the torque direction the subject was attempting to maximize. This allowed characterization of the multijoint torque patterns associated with the generation of MVTs in the eight directions examined. Significant differences were found between the torque patterns exhibited by the paretic limb of the hemiparetic group (n = 8) and those observed for the nonparetic limb and control group (n = 4). Potential neural and biomechanical mechanisms underlying these abnormal torque patterns are discussed along with implications for the functional use of the paretic limb.

Original languageEnglish (US)
Pages (from-to)273-283
Number of pages11
JournalMuscle and Nerve
Volume24
Issue number2
DOIs
StatePublished - Feb 8 2001

Keywords

  • Joint torque
  • Muscle synergies
  • Static posture
  • Stroke
  • Upper extremity
  • Weakness

ASJC Scopus subject areas

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

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