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Research Papers

The Sensitivity of Joint Torques During Running to Forceplate Data Error

[+] Author and Article Information
Anne Schmitz

Department of Mechanical Engineering,
Gannon University,
109 University Square,
Erie, PA 16541
e-mail: schmitz005@gannon.edu

Jaclyn Norberg

Department of Sport and Movement Science,
Salem State University,
352 Lafayette Street,
Salem, MA 01970
e-mail: Jnorberg@salemstate.edu

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received July 14, 2015; final manuscript received June 3, 2016; published online June 30, 2016. Assoc. Editor: Xiaopeng Zhao.

J. Dyn. Sys., Meas., Control 138(11), 111001 (Jun 30, 2016) (5 pages) Paper No: DS-15-1317; doi: 10.1115/1.4033829 History: Received July 14, 2015; Revised June 03, 2016

The purpose of this study was to evaluate the relationship between forceplate inaccuracies and joint torques during running. Instrumented gait analysis data were collected on a single subject running above ground. A Monte Carlo analysis was performed using 60 simulations. In each simulation, joint torques were computed as the ground reaction force (GRF) data were perturbed. Errors in joint torques were larger for proximal joints compared to the distal joints. These errors in joint torques were due more to inaccuracies in the GRF magnitude than the center of pressure (COP) measurements. Clinically, these results may be used to determine a priori the forceplate accuracy needed to measure a desired difference in joint torque between patient populations.

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Copyright © 2016 by ASME
Topics: Torque , Errors , Knee
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References

Figures

Grahic Jump Location
Fig. 1

Retroreflective markers placed on the body to create body-fixed reference frames

Grahic Jump Location
Fig. 2

Flowchart of the Monte Carlo analysis performed. Visual 3D was used as the dynamics engine and matlab as the processing software.

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