2012_jab_lewis.pdf (825.47 kB)
Are joint torque models limited by an assumption of monoarticularity?
journal contribution
posted on 2013-01-10, 11:52 authored by Martin G.C. Lewis, Mark KingMark King, Fred YeadonFred Yeadon, Filipe ConceicaoThis 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 KineticsVersion
- VoR (Version of Record)
Publication date
2012Notes
This article was published in the Journal of Applied Biomechanics [© Human Kinetics]. The definitive version is available at: http://hk.humankinetics.com/JAB/journalAbout.cfmISSN
1065-8483eISSN
1543-2688Publisher version
Language
- en