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research-article

Estimation of Maximum Muscle Contraction Frequency in a Finger Tapping Motion Using Forward Musculoskeletal Dynamic Simulations

[+] Author and Article Information
Mohammad Sharif Shourijeh

Mechanical Engineering Department, University of Ottawa, Canada
msharifs@uottawa.ca

Reza Sharif Razavian

Department of Systems Design Engineering, University of Waterloo, Canada
rsharifr@uwaterloo.ca

John McPhee

Department of Systems Design Engineering, University of Waterloo, Canada
mcphee@uwaterloo.ca

1Corresponding author.

ASME doi:10.1115/1.4036288 History: Received April 13, 2016; Revised February 21, 2017

Abstract

A model for forward dynamic simulation of the rapid tapping motion of an index finger is presented. The finger model was actuated by two muscle groups: one flexor and one extensor. The goal of this analysis was to estimate the maximum tapping frequency that the index finger can achieve using forward dynamics simulations. To this goal, each muscle excitation signal was parameterized by a seventh-order Fourier series as a function of time. Simulations found that the maximum tapping frequency was 6~Hz, which is reasonably close to the experimental data. Amplitude attenuation (37% at 6Hz) due to excitation/activation filtering, as well as the inability of muscles to produce enough force at high contractile velocities, are factors that prevent the finger from moving at higher frequencies. Musculoskeletal models have the potential to shed light on these restricting mechanisms and help to better understand human capabilities in motion production.

Copyright (c) 2017 by ASME
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