Electrical and mechanical output of the knee muscles during isometric and isokinetic activity in stroke and healthy adults.

Abstract:

:Surface electromyography (EMG) and torque were measured from knee flexors and extensors in 12 control subjects (CS) aged 25-59 years (10 female) and bilaterally in 12 stroke subjects (SS) aged 27-75 years (four female) with hemiparesis and mild clinical spasticity. They performed isometric and isokinetic maximal voluntary contractions (MVC) and also isokinetic passive movements at angular velocities from 30 to 300 degrees/s. The time taken to walk 10 m was documented. Greater torque was recorded during passive extension in the paretic legs when compared with both non-paretic and control limbs (p < 0.01). No EMG activity was measured in any subject. Isometric MVC torque of both muscles in the paretic leg was less (p < 0.01) than both the non-paretic and control limbs. The SS generated relatively less torque bilaterally at the lower velocities than CS. Not all SS reached the higher velocities and none of the paretic limbs achieved 300 degrees/s during flexion. Gait speed correlated with maximal paretic knee extension velocity (p < 0.001). The extent of co-contraction during MVCs was generally low or absent and similar in all three groups. These results suggest a mechanical rather than reflex cause for the restraint detected clinically. Low force generation by the paretic agonists appeared to be the major cause of reduced torque, rather than antagonist opposition.

journal_name

Disabil Rehabil

authors

Davies JM,Mayston MJ,Newham DJ

doi

10.3109/09638289609166022

subject

Has Abstract

pub_date

1996-02-01 00:00:00

pages

83-90

issue

2

eissn

0963-8288

issn

1464-5165

journal_volume

18

pub_type

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