An isovelocity dynamometer method to determine monoarticular and biarticular muscle parameters

CONCEIÇÃO F, , KING, M.A., YEADON, M.R., LEWIS, M.G.C. and FORRESTER, S.E., 2012. An isovelocity dynamometer method to determine monoarticular and biarticular muscle parameters. Journal of Applied Biomechanics, 28 (6), pp. 751-759. ISSN 1065-8483

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Abstract

This study aimed to determine whether subject-specific individual muscle models for the ankle plantar flexors could be obtained from single joint isometric and isovelocity maximum torque measurements in combination with a model of plantar flexion. Maximum plantar flexion torque measurements were taken on one subject at six knee angles spanning full flexion to full extension. A planar three-segment (foot, shank and thigh), two muscle (soleus and gastrocnemius) model of plantar flexion was developed. Seven parameters per muscle were determined by minimizing a weighted root mean square difference (wRMSD) between the model output and the experimental torque data. Valid individual muscle models were obtained using experimental data from only two knee angles giving a wRMSD score of 16 N m, with values ranging from 11 to 17 N m for each of the six knee angles. The robustness of the methodology was confirmed through repeating the optimization with perturbed experimental torques (±20%) and segment lengths (±10%) resulting in wRMSD scores of between 13 and 20 N m. Hence, good representations of maximum torque can be achieved from subject-specific individual muscle models determined from single joint maximum torque measurements. The proposed methodology could be applied to muscle-driven models of human movement with the potential to improve their validity.

Item Type: Journal article
Publication Title: Journal of Applied Biomechanics
Creators: Conceição F, , King, M.A., Yeadon, M.R., Lewis, M.G.C. and Forrester, S.E.
Publisher: Human Kinetics Inc.
Date: 2012
Volume: 28
Number: 6
ISSN: 1065-8483
Divisions: Schools > School of Science and Technology
Depositing User: EPrints Services
Date Added: 09 Oct 2015 10:10
Last Modified: 19 Oct 2015 14:28
URI: http://irep.ntu.ac.uk/id/eprint/8791

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