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Vol. 181, No. 1, 2005
Issue release date: 2005
Section title: Original Paper
Cells Tissues Organs 2005;181:38–50
(DOI:10.1159/000089967)

Intermuscular Interaction between Synergists in Rat Originates from both Intermuscular and Extramuscular Myofascial Force Transmission

Maas H.a, b · Meijer H.J.M.b · Huijing P.A.b, c
aCenter for Human Movement Studies, School of Applied Physiology, Georgia Institute of Technology, Atlanta, Ga., USA; bInstituut voor Fundamentele en Klinische Bewegingswetenschappen, Faculteit Bewegingswetenschappen, Vrije Universiteit, Amsterdam, and cIntegrated Biomedical Engineering for Restoration of Human Function, Instituut voor Biomedische Technologie, Faculteit Constructieve Technische Wetenschappen, Universiteit Twente, Enschede, The Netherlands

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 5/11/2005
Accepted: 10/6/2005
Published online: 1/27/2006
Issue release date: 2005

Number of Print Pages: 13
Number of Figures: 6
Number of Tables: 0

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: http://www.karger.com/CTO

Abstract

The purpose of the present study is to investigate the origin of mechanical interactions between the rat extensor digitorum longus (EDL) muscle and the grouped tibialis anterior and extensor hallucis longus muscles (TA+EHL). The proximal and distal tendons of EDL as well as the tied distal tendons of TA+EHL were transected and connected to force transducers. Connective tissues at the muscle bellies of the anterior crural compartment were left intact. Supramaximal stimulation of the common peroneal nerve activated all muscles maximally and simultaneously. Length-isometric force characteristics of distal TA+EHL were assessed. Simultaneously, forces exerted at the proximal and distal tendons of EDL, kept at constant muscle-tendon complex length and position, were measured. Intermuscular interaction was tested in two conditions: (a) after full longitudinal compartmental fasciotomy, and (b) after blunt dissection of the intermuscular connective tissue linkages between EDL and TA+EHL. Note that in the latter condition, intermuscular myofascial pathways were eliminated. In the initial condition, lengthening TA+EHL by 12 mm increased proximal (by 0.14 N, i.e. 9.5%) and decreased distal EDL force (by 0.21 N, i.e. 11.8%), despite the fact that EDL muscle-tendon complex length was kept constant. Blunt dissection decreased TA+EHL and distal EDL forces at low TA+EHL lengths only, while proximal EDL force decreased for all TA+EHL lengths tested. The dissection caused no changes in the TA+EHL length effects on proximal EDL force. In contrast, the amplitude of change in the distal EDL force curve decreased significantly (by 39%) subsequent to blunt dissection. It is concluded that mechanical interaction between synergists originates from both intermuscular as well as extramuscular connective tissues. The highest contribution, however, should be ascribed to the extramuscular pathway.

© 2005 S. Karger AG, Basel


  

Author Contacts

Prof. Peter A. Huijing, PhD
Faculteit Bewegingswetenschappen, Vrije Universiteit
Van der Boechorststraat 9
NL–1081 BT Amsterdam (The Netherlands)
Tel. +31 20 444 8476, Fax +31 20 444 8529, E-Mail P_A_J_B_M_Huijing@fbw.vu.nl

  

Article Information

Accepted after revision: October 6, 2005
Number of Print Pages : 13
Number of Figures : 6, Number of Tables : 0, Number of References : 26

  

Publication Details

Cells Tissues Organs (in vivo, in vitro)

Vol. 181, No. 1, Year 2005 (Cover Date: 2005)

Journal Editor: Denker, H.-W. (Essen)
ISSN: 1422–6405 (print), 1422–6421 (Online)

For additional information: http://www.karger.com/CTO


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 5/11/2005
Accepted: 10/6/2005
Published online: 1/27/2006
Issue release date: 2005

Number of Print Pages: 13
Number of Figures: 6
Number of Tables: 0

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: http://www.karger.com/CTO


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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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