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[Recruitment of the bi-articular gastrocnemius muscles during maximal isometric contractions in humans].

Authors
  • Legreneur, P1
  • Morlon, B
  • Van Hoecke, J
  • 1 Groupe Analyse du Mouvement, UFR-STAPS, Université de Bourgogne, Dijon, France. [email protected] , (France)
Type
Published Article
Journal
Comptes rendus des seances de la Societe de biologie et de ses filiales
Publication Date
Jan 01, 1996
Volume
190
Issue
5-6
Pages
621–632
Identifiers
PMID: 9074727
Source
Medline
Language
French
License
Unknown

Abstract

The main purpose of this study was to investigate the maximal isometric plantarflexion moment as a function of the triceps surae's length. As the gastrocnemius are bi-articular actuators, their respective lengths were modified by variations of the ankle and knee joints angles. The mechanical results agreed ones previously published in the literature. The maximal and minimal isometric moments were attained at maximal lengthening and shortening of the gastrocnemius respectively. The gastrocnemius electromyographic (EMG) activities showed paradoxal results. Their EMG activities decreased with their lengthening when this was induced by ankle joint angle variations. Inversely, their EMG activities increased with their lengthening when this was induced by knee joint angle variations. These results allowed the authors to hypothesize the existence of specific recruitment of neuro-muscular compartments of the gastrocnemius with knee extension.

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