Relation between electromyogram and torque of isometric reflex contractions in man.

Abstract:

:Human subjects maintained isometric plantar or dorsal flexions of the ankle in a matching task. H-reflexes of different sizes were superimposed on the steady activity. The peak-to-peak amplitude of the reflexes was measured on the electromyogram (EMG) of the soleus muscle. The size of the corresponding muscle contractions was determined on the isometric torque signal in relation to the maintained flexion force. The EMG-torque relation which was defined as the reflex muscle contraction as a function of the EMG reflex signal approximated a square root function for a given steady contraction level. It was not modulated by steady dorsal flexions, but it decreased continuously with stronger plantar steady torques. This dependence was caused by the silent period following the reflex discharge. Since the reflex discharge and the silent period were near in time to the duration of the contraction, the silent period had a direct effect on the reflex contraction amplitude.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Ruegg DG,Fluri M

doi

10.1016/0304-3940(89)90571-5

subject

Has Abstract

pub_date

1989-08-28 00:00:00

pages

174-8

issue

2

eissn

0304-3940

issn

1872-7972

pii

0304-3940(89)90571-5

journal_volume

103

pub_type

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