Changes in muscle spindle firing in response to length changes of neighboring muscles.

Abstract:

:Skeletal muscle force can be transmitted to the skeleton, not only via its tendons of origin and insertion but also through connective tissues linking the muscle belly to surrounding structures. Through such epimuscular myofascial connections, length changes of a muscle may cause length changes within an adjacent muscle and hence, affect muscle spindles. The aim of the present study was to investigate the effects of epimuscular myofascial forces on feedback from muscle spindles in triceps surae muscles of the rat. We hypothesized that within an intact muscle compartment, muscle spindles not only signal length changes of the muscle in which they are located but can also sense length changes that occur as a result of changing the length of synergistic muscles. Action potentials from single afferents were measured intra-axonally in response to ramp-hold release (RHR) stretches of an agonistic muscle at different lengths of its synergist, as well as in response to synergist RHRs. A decrease in force threshold was found for both soleus (SO) and lateral gastrocnemius afferents, along with an increase in length threshold for SO afferents. In addition, muscle spindle firing could be evoked by RHRs of the synergistic muscle. We conclude that muscle spindles not only signal length changes of the muscle in which they are located but also local length changes that occur as a result of changing the length and relative position of synergistic muscles.

journal_name

J Neurophysiol

authors

Smilde HA,Vincent JA,Baan GC,Nardelli P,Lodder JC,Mansvelder HD,Cope TC,Maas H

doi

10.1152/jn.00937.2015

subject

Has Abstract

pub_date

2016-06-01 00:00:00

pages

3146-55

issue

6

eissn

0022-3077

issn

1522-1598

pii

jn.00937.2015

journal_volume

115

pub_type

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