Motor unit-muscle spindle interactions in active muscles of decerebrate cats

William E. Cameron; Marc D. Binder; Barry R. Botterman; Robert M. Reinking; Douglas G. Stuart

doi:10.1016/0304-3940(80)90255-4

Motor unit-muscle spindle interactions in active muscles of decerebrate cats

William E. Cameron, Marc D. Binder, Barry R. Botterman, Robert M. Reinking, Douglas G. Stuart

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Abstract

Single muscle spindle afferent and motor unit EMG spike trains have been recorded simultaneously during periods of spontaneous motor activity in triceps surae muscles of decerebrate cats. The approximate time course and magnitude of the motor unit contractions were extracted from the whole muscle force record by spike-triggered averaging, and the functional interactions between motor unit contractions and spindle discharge were assessed by cross-correlating their respective spike trains. We have found that both spindle group Ia and II afferents are responsive to the contractions of single motor units in the presence of spontaneous motor activity, being strongly coupled to the activity of some motor units and indifferent to the contractions of others. Moreover, the cross-correlation analysis revealed modulation of a single motor unit's discharge pattern by the input of a single Ia afferent.

Original language	English (US)
Pages (from-to)	55-60
Number of pages	6
Journal	Neuroscience Letters
Volume	19
Issue number	1
DOIs	https://doi.org/10.1016/0304-3940(80)90255-4
State	Published - 1980

ASJC Scopus subject areas

Neuroscience(all)

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10.1016/0304-3940(80)90255-4

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title = "Motor unit-muscle spindle interactions in active muscles of decerebrate cats",

abstract = "Single muscle spindle afferent and motor unit EMG spike trains have been recorded simultaneously during periods of spontaneous motor activity in triceps surae muscles of decerebrate cats. The approximate time course and magnitude of the motor unit contractions were extracted from the whole muscle force record by spike-triggered averaging, and the functional interactions between motor unit contractions and spindle discharge were assessed by cross-correlating their respective spike trains. We have found that both spindle group Ia and II afferents are responsive to the contractions of single motor units in the presence of spontaneous motor activity, being strongly coupled to the activity of some motor units and indifferent to the contractions of others. Moreover, the cross-correlation analysis revealed modulation of a single motor unit's discharge pattern by the input of a single Ia afferent.",

author = "Cameron, {William E.} and Binder, {Marc D.} and Botterman, {Barry R.} and Reinking, {Robert M.} and Stuart, {Douglas G.}",

note = "Funding Information: We would like to thank Dr. D. Roscoe for technicala ssistancea nd Drs. J.B. Angevine,E . Eldred, E.E. Fetz and G.P. Moore for criticismso f this manuscript. The work was supportedb y the Fan Kane Foundation and by USPHS Grants NS 07888, HL 07249, RR 05675, NS 15404 and a Teacher-InvestigatDore velopment Award (NS 00345) to M.D.B.",

year = "1980",

doi = "10.1016/0304-3940(80)90255-4",

language = "English (US)",

volume = "19",

pages = "55--60",

journal = "Neuroscience Letters",

issn = "0304-3940",

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T1 - Motor unit-muscle spindle interactions in active muscles of decerebrate cats

AU - Cameron, William E.

AU - Binder, Marc D.

AU - Botterman, Barry R.

AU - Reinking, Robert M.

AU - Stuart, Douglas G.

N1 - Funding Information: We would like to thank Dr. D. Roscoe for technicala ssistancea nd Drs. J.B. Angevine,E . Eldred, E.E. Fetz and G.P. Moore for criticismso f this manuscript. The work was supportedb y the Fan Kane Foundation and by USPHS Grants NS 07888, HL 07249, RR 05675, NS 15404 and a Teacher-InvestigatDore velopment Award (NS 00345) to M.D.B.

PY - 1980

Y1 - 1980

N2 - Single muscle spindle afferent and motor unit EMG spike trains have been recorded simultaneously during periods of spontaneous motor activity in triceps surae muscles of decerebrate cats. The approximate time course and magnitude of the motor unit contractions were extracted from the whole muscle force record by spike-triggered averaging, and the functional interactions between motor unit contractions and spindle discharge were assessed by cross-correlating their respective spike trains. We have found that both spindle group Ia and II afferents are responsive to the contractions of single motor units in the presence of spontaneous motor activity, being strongly coupled to the activity of some motor units and indifferent to the contractions of others. Moreover, the cross-correlation analysis revealed modulation of a single motor unit's discharge pattern by the input of a single Ia afferent.

AB - Single muscle spindle afferent and motor unit EMG spike trains have been recorded simultaneously during periods of spontaneous motor activity in triceps surae muscles of decerebrate cats. The approximate time course and magnitude of the motor unit contractions were extracted from the whole muscle force record by spike-triggered averaging, and the functional interactions between motor unit contractions and spindle discharge were assessed by cross-correlating their respective spike trains. We have found that both spindle group Ia and II afferents are responsive to the contractions of single motor units in the presence of spontaneous motor activity, being strongly coupled to the activity of some motor units and indifferent to the contractions of others. Moreover, the cross-correlation analysis revealed modulation of a single motor unit's discharge pattern by the input of a single Ia afferent.

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Motor unit-muscle spindle interactions in active muscles of decerebrate cats

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