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Are joint torque models limited by an assumption of monoarticularity?

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journal contribution
posted on 2013-01-10, 11:52 authored by Martin G.C. Lewis, Mark KingMark King, Fred YeadonFred Yeadon, Filipe Conceicao
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. Isovelocity 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 MJ 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.

History

School

  • Sport, Exercise and Health Sciences

Citation

LEWIS, M.G.C. ... et al., 2012. Are joint torque models limited by an assumption of monoarticularity? Journal of Applied Biomechanics, 28 (5), pp. 520 - 529.

Publisher

© Human Kinetics

Version

  • VoR (Version of Record)

Publication date

2012

Notes

This article was published in the Journal of Applied Biomechanics [© Human Kinetics]. The definitive version is available at: http://hk.humankinetics.com/JAB/journalAbout.cfm

ISSN

1065-8483

eISSN

1543-2688

Language

  • en