Finger joint impedance during tapping on a computer keyswitch Export

@article{citeulike:401416, 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 by energy production during the contact period. During the loading phase of contact the MCP joint flexed and produced energy, whereas the proximal and distal IP joints extended and absorbed energy. These results suggest that the MCP joint does work on the interphalangeal joints as well as on the keyswitch.}, author = {Jindrich, Devin L. and Balakrishnan, Aruna D. and Dennerlein, Jack T.}, citeulike-article-id = {401416}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.jbiomech.2004.01.001}, citeulike-linkout-1 = {http://www.sciencedirect.com/science/article/B6T82-4BYBY5Y-1/2/eee236624fc9e322ee09c8f74c1c11da}, doi = {10.1016/j.jbiomech.2004.01.001}, journal = {Journal of Biomechanics}, keywords = {biomechanics, finger, imdepedence, joint, stiffness}, month = {October}, number = {10}, pages = {1589--1596}, posted-at = {2005-11-19 18:52:19}, priority = {5}, title = {Finger joint impedance during tapping on a computer keyswitch}, url = {http://dx.doi.org/10.1016/j.jbiomech.2004.01.001}, volume = {37}, year = {2004} }

TY - JOUR ID - citeulike:401416 L3 - citeulike-article-id:401416 N2 - 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 by energy production during the contact period. During the loading phase of contact the MCP joint flexed and produced energy, whereas the proximal and distal IP joints extended and absorbed energy. These results suggest that the MCP joint does work on the interphalangeal joints as well as on the keyswitch. IS - 10 JF - Journal of Biomechanics EP - 1596 TI - Finger joint impedance during tapping on a computer keyswitch VL - 37 SP - 1589 KW - biomechanics KW - finger KW - imdepedence KW - joint KW - stiffness AU - Jindrich, Devin AU - Balakrishnan, Aruna AU - Dennerlein, Jack PY - 2004/10// UR - http://dx.doi.org/10.1016/j.jbiomech.2004.01.001 ER -