The activation time-course of contractile elements estimated from in vivo fascicle behaviours during twitch contractions

Toshiaki Oda, Ryutaro Himeno, Dean C. Hay, Hiroaki Kanehisa, Tetsuo Fukunaga, Yasuo Kawakami

Research output: Contribution to journalArticle

Abstract

To better understand the cascade from neural activation up to force production within in vivo contracting muscle-tendon units, we estimated activation of contractile elements from experimentally measured human fascicle length change and force using a Hill-type muscle model. The experiment was conducted with respect to twitch contractions of the tibialis anterior muscle at three joint angles. As muscle contractile element force is a function of its length and velocity, the activation of contractile elements was calculated using a Hill-type muscle model and measured data. The results were able to reproduce the continuous rising activation of contractile elements after termination of electromyographic activity, the earlier shift of peak activation in time compared to twitch force, and the differences in time-course activation at three different joint angles. These findings are consistent with the predicted change in the activation of contractile elements from previous reports. Also, the results suggest that the time-course of the activation of contractile elements was greatly influenced by the change in force generating capacities related to both length and velocity, even in fixed end contractions, which could result from muscle-tendon interaction.

Original languageEnglish
Pages (from-to)1233-1241
Number of pages9
JournalJournal of sports sciences
Volume31
Issue number11
DOIs
Publication statusPublished - 2013 Apr 8

Keywords

  • Electrical stimulation
  • Fascicle length change
  • Force generating capacities
  • Simulation

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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