Adjustment of Muscle Mechanics Model Parameters to Simulate Dynamic Contractions in Older Adults

[+] Author and Article Information
Darryl G. Thelen

Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706-1572

J Biomech Eng 125(1), 70-77 (Feb 14, 2003) (8 pages) doi:10.1115/1.1531112 History: Received September 01, 2000; Revised July 01, 2002; Online February 14, 2003
Copyright © 2003 by ASME
Topics: Force , Muscle , Tendons , Torque
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Grahic Jump Location
A Hill-type model was used to describe musculo-tendon contraction mechanics. The model consists of a muscle contractile element in series and parallel with elastic elements. (a) A Gaussian curve was used to describe the active force-length relationship of muscle. (b) The muscle force-velocity function was scaled with activation such that the unloaded contraction velocity was reduced during sub-maximal activation. (c) Tendon force was assumed to increase exponentially with strain during an initial toe region, and linearly with strain thereafter.
Grahic Jump Location
Simulated muscle excitations and ankle torques during a rapid isometric contraction (thick lines). The experimental data (thin lines) are a representative tibialis anterior myoelectric signal and ensemble-averaged torque-time curve recorded from young adult males 7.
Grahic Jump Location
Simulated contractions in dorsiflexion (DF) and plantarflexion (PF) in response to unit pulse muscle excitations of 5 ms duration. Model parameters representative of young adults were used. Contractions are prolonged in plantarflexion due to larger tendon length/fiber length ratios in the plantarflexor muscles.
Grahic Jump Location
Simulated torque-angle curves for isometric (thick black lines), 30 deg/s (thick gray lines) and 120 deg/s (thin black lines) isokinetic contractions using model parameters representative of older males. The superimposed points are the mean (error bar=1 SD) torques recorded experimentally from old males during isometric and isokinetic exertions 7.
Grahic Jump Location
Simulated peak ankle torques, normalized to maximal isometric torque, as a function of velocity during isokinetic dorsiflexion and plantarflexion exertions for young (thick lines) and old (thin lines) adults. Superimposed are the mean (error bar=1 SD) normalized torques recorded from healthy young and old adults 7.



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