Viscoelastic response of the finger pad to incremental tangential displacements

Todd C. Pataky; Mark L. Latash; Vladimir M. Zatsiorsky

doi:10.1016/j.jbiomech.2004.07.004

Viscoelastic response of the finger pad to incremental tangential displacements

Todd C. Pataky, Mark L. Latash, Vladimir M. Zatsiorsky

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

The finger pads of eight subjects were loaded by tangential displacement (x - perpendicular to the long axis of the finger) of a contacted surface when the distal and proximal interphalangeal joints (DIP and PIP, respectively) were alternately constrained. The finger pad responded in a linearly viscoelastic manner during loading, but exhibited highly nonlinear behavior upon unloading. The observed tangential force (F_T) relaxations were nonlinear and could be modeled well by a logarithmic function. The average F_T relaxation duration (τ) was 11.8 s. Apparent tangential stiffness (k _T), determined by F_T after relaxation, varied linearly with normal force. With the DIP joints constrained the fingers showed significantly larger stiffness than with the PIP joints constrained (p<0.001). Implications for finger force coordination studies are discussed.

Original language	English (US)
Pages (from-to)	1441-1449
Number of pages	9
Journal	Journal of Biomechanics
Volume	38
Issue number	7
DOIs	https://doi.org/10.1016/j.jbiomech.2004.07.004
State	Published - Jul 2005

All Science Journal Classification (ASJC) codes

Biophysics
Orthopedics and Sports Medicine
Biomedical Engineering
Rehabilitation

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10.1016/j.jbiomech.2004.07.004

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title = "Viscoelastic response of the finger pad to incremental tangential displacements",

abstract = "The finger pads of eight subjects were loaded by tangential displacement (x - perpendicular to the long axis of the finger) of a contacted surface when the distal and proximal interphalangeal joints (DIP and PIP, respectively) were alternately constrained. The finger pad responded in a linearly viscoelastic manner during loading, but exhibited highly nonlinear behavior upon unloading. The observed tangential force (FT) relaxations were nonlinear and could be modeled well by a logarithmic function. The average FT relaxation duration (τ) was 11.8 s. Apparent tangential stiffness (k T), determined by FT after relaxation, varied linearly with normal force. With the DIP joints constrained the fingers showed significantly larger stiffness than with the PIP joints constrained (p<0.001). Implications for finger force coordination studies are discussed.",

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AU - Pataky, Todd C.

AU - Latash, Mark L.

AU - Zatsiorsky, Vladimir M.

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N2 - The finger pads of eight subjects were loaded by tangential displacement (x - perpendicular to the long axis of the finger) of a contacted surface when the distal and proximal interphalangeal joints (DIP and PIP, respectively) were alternately constrained. The finger pad responded in a linearly viscoelastic manner during loading, but exhibited highly nonlinear behavior upon unloading. The observed tangential force (FT) relaxations were nonlinear and could be modeled well by a logarithmic function. The average FT relaxation duration (τ) was 11.8 s. Apparent tangential stiffness (k T), determined by FT after relaxation, varied linearly with normal force. With the DIP joints constrained the fingers showed significantly larger stiffness than with the PIP joints constrained (p<0.001). Implications for finger force coordination studies are discussed.

AB - The finger pads of eight subjects were loaded by tangential displacement (x - perpendicular to the long axis of the finger) of a contacted surface when the distal and proximal interphalangeal joints (DIP and PIP, respectively) were alternately constrained. The finger pad responded in a linearly viscoelastic manner during loading, but exhibited highly nonlinear behavior upon unloading. The observed tangential force (FT) relaxations were nonlinear and could be modeled well by a logarithmic function. The average FT relaxation duration (τ) was 11.8 s. Apparent tangential stiffness (k T), determined by FT after relaxation, varied linearly with normal force. With the DIP joints constrained the fingers showed significantly larger stiffness than with the PIP joints constrained (p<0.001). Implications for finger force coordination studies are discussed.

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Viscoelastic response of the finger pad to incremental tangential displacements

Abstract

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