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Electromyogram coactivation patterns of the elbow antagonist muscles during slow isokinetic movement.

Abstract：

:Electromyograms from the flexor and extensor muscles of normal human elbows were simultaneously recorded during maximal-effort isokinetic movement at 15 degrees/s over the joint's full range of motion. The antagonist electromyogram was normalized with respect to its electromyogram when acting as agonist at maximal effort and plotted as a function of joint angle. The coactivation patterns were nearly inversely related to each muscle's moment arm variations with joint angle, suggesting that the antagonist may have generated constant opposing torque throughout the movement. Female subjects had a statistically significant higher coactivation level of the flexors and extensors compared with that of males, reflecting the increase in joint efficiency associated with daily muscular activity which is manifested by reduction in antagonist activity. The functional role of antagonist coactivation in augmenting ligament stabilizing functions, equalizing the pressure distribution over the articular surface, and regulating the joint's mechanical impedance are discussed. The source of such coactivation appears to be due to proprioceptive and joint kinesthetic afferent input in addition to possible direct common drive.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Solomonow M,Baratta R,Zhou BH,D'Ambrosia R

doi

10.1016/0014-4886(88)90032-5

subject

Has Abstract

pub_date

1988-06-01 00:00:00

pages

470-7

issue

3

eissn

0014-4886

issn

1090-2430

journal_volume

100

pub_type

杂志文章

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