Nonlinear summation of force in cat soleus muscle results primarily from stretch of the common-elastic elements

Thomas G Sandercock*

*Corresponding author for this work

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

The complex connective tissue structure of muscle and tendon suggests that forces from two parts of a muscle may not summate linearly. This study measured the nonlinear summation of force (F(n1)) in whole cat soleus during isometric and ramp movements. In six anesthetized cats, the soleus was attached to a servomechanism to control muscle length and record force. The ventral roots were divided into two bundles, each innervating about half the soleus; thus the two parts could be stimulated alone or together. In all experiments, F(n1) was small (<6% of maximum tetanic tension). Peak F(n1) occurred during changes in muscle force, either as a result of imposed muscle movement or the onset or offset of a stimulus train. The data were fit to a model in which both parts of the muscle were assumed to stretch to a common elasticity. The servomechanism was programmed to compensate for reduced stretch of the common elasticity during partial compared with whole muscle activation. These compensatory movements showed how the model could account for most, but not all, of F(n1).

Original languageEnglish (US)
Pages (from-to)2206-2214
Number of pages9
JournalJournal of Applied Physiology
Volume89
Issue number6
StatePublished - Dec 20 2000

Keywords

  • Architecture
  • Tendon

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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