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 Neuroljournal_title
Experimental neurologyauthors
Foehring RC,Sypert GW,Munson JBdoi
10.1016/0014-4886(88)90048-9subject
Has Abstractpub_date
1988-09-01 00:00:00pages
366-73issue
3eissn
0014-4886issn
1090-2430journal_volume
101pub_type
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