Relation of whole muscle contractile properties to source of innervation.

Abstract:

:This work investigated the extent to which constituent proportions of fast- and slow-twitch muscle units determine whole muscle contractile properties. We employed several self- and cross-reinnervation models using synergistic homogeneous and heterogeneous muscles. By comparing the present data with previously published single-unit studies on the same animals, we confirmed that the whole muscle data provide a weighted ensemble of single-unit effects. They corroborate conclusions based upon single-unit data concerning the proportions of fast- and slow-twitch units, the degree of recovery, and the alteration of force- and speed-related properties of muscle by nerve. In particular, the shape of the whole muscle isometric twitch was a reliable indicator of the relative proportions of fast- and slow-twitch motor units in the muscle. The half-rise time was an indicator of the presence or absence of fast units, and the half-relaxation time was an indicator of the presence of slow units.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Foehring RC,Sypert GW,Munson JB

doi

10.1016/0014-4886(88)90048-9

subject

Has Abstract

pub_date

1988-09-01 00:00:00

pages

366-73

issue

3

eissn

0014-4886

issn

1090-2430

journal_volume

101

pub_type

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