Are joint torque models limited by an assumption of monoarticularity?

Lewis, M.G.C. ORCID: 0000-0001-5918-3444, King, M.A., Yeadon, M.R. and Conceição, F., 2012. Are joint torque models limited by an assumption of monoarticularity? Journal of Applied Biomechanics, 28 (5), pp. 520-529. ISSN 1065-8483

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Abstract

This study determines whether maximal voluntary ankle plantar flexor torque could be more accurately represented using a torque generator that is a function of both knee and ankle kinematics. Iso velocity and isometric ankle plantar flexor torques were measured on a single participant for knee joint angles of 111° to 169° (approximately full extension) using a Contrex M J dynamometer. Maximal voluntary torque was represented by a 19-parameter two-joint function of ankle and knee joint angles and angular velocities with the parameters determined by minimizing a weighted root mean square difference between measured torques and the two-joint function. The weighted root mean square difference between the two-joint function and the measured torques was 10 N-m or 3% of maximum torque. The two-joint function was a more accurate representation of maximal voluntary ankle plantar flexor torques than an existing single-joint function where differences of 19% of maximum torque were found. It is concluded that when the knee is flexed by more than 40°, a two-joint representation is necessary.

Item Type:	Journal article
Publication Title:	Journal of Applied Biomechanics
Creators:	Lewis, M.G.C., King, M.A., Yeadon, M.R. and Conceição, F.
Publisher:	Human Kinetics Inc.
Date:	2012
Volume:	28
Number:	5
ISSN:	1065-8483
Divisions:	Schools > School of Science and Technology
Record created by:	EPrints Services
Date Added:	09 Oct 2015 10:35
Last Modified:	25 Feb 2019 15:58
URI:	https://irep.ntu.ac.uk/id/eprint/15246

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