Finger joint impedance during tapping on a computer keyswitch

Journal of Biomechanics
Devin L JindrichJ T Dennerlein

Abstract

We studied the dynamic behavior of finger joints during the contact period of tapping on a computer keyswitch, to characterize and parameterize joint function with a lumped-parameter impedance model. We tested the hypothesis that the metacarpophalangeal (MCP) and interphalangeal (IP) joints act similarly in terms of kinematics, torque, and energy production when tapping. Fifteen human subjects tapped with the index finger of the right hand on a computer keyswitch mounted on a two-axis force sensor, which measured forces in the vertical and sagittal planes. Miniature fiber-optic goniometers mounted across the dorsal side of each joint measured joint kinematics. Joint torques were calculated from endpoint forces and joint kinematics using an inverse dynamic algorithm. For each joint, a linear spring and damper model was fitted to joint torque, position, and velocity during the contact period of each tap (22 per subject on average). The spring-damper model could account for over 90% of the variance in torque when loading and unloading portions of the contact were separated, with model parameters comparable to those previously measured during isometric loading of the finger. The finger joints functioned differently, as illustrated ...Continue Reading

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Citations

Jun 30, 2011·Computer Methods in Biomechanics and Biomedical Engineering·Kent D ButzEric A Nauman
May 1, 2007·Journal of Biomechanics·Jack T DennerleinJaap H van Dieën
Nov 10, 2007·Journal of Biomechanics·John Z WuRen G Dong
Dec 27, 2005·Journal of Biomechanics·Po-Ling KuoJack T Dennerlein
May 16, 2006·Human Factors·Aruna D BalakrishnanJack T Dennerlein
Feb 23, 2017·Journal of Neuroengineering and Rehabilitation·Byungchul KimKyu-Jin Cho
Apr 14, 2020·Journal of Dynamic Systems, Measurement, and Control·James A TigueStephen A Mascaro
Dec 4, 2019·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Deanna S AsakawaJennifer L Hein
Mar 18, 2017·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Deanna S AsakawaDevin L Jindrich

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