Predictions of knee and ankle moments of force in walking from EMG and kinematic data

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Olney, Sandra J.¹; Winter, David A.²

Predictions of knee and ankle moments of force in walking from EMG and kinematic data

J Biomech. 1985;18(1):9-20

©1985 Pergamon Press

Affiliations

¹School of Rehabilitation Therapy, Queen’s University, Kingston, Ontario, Canada K7L 3N6

²Department of Kinesiology, University of Waterloo, Waterloo. Ontario. Canada N2L 3G1
Abstract

A deterministic model was developed and validated to calculate instantaneous ankle and knee moments during walking using processed EMG from representative muscles, instantaneous joint angle as a correlate of muscle length and angular velocity as a correlate of muscle velocity, and having available total instantaneous joint moments for derivation of certain model parameters. A linear regression of the moment on specifically processed EMG, recorded while each subject performed cycled isometric calibration contractions, yielded the constants for a basic moment-EMG relationship. Using the resultant moment for optimization, the predicted moment was proportionally augmented for longer muscle lengths and reduced for shorter lengths. Similarly, the predicted moment was reduced for shortening velocities and increased if the muscle was lengthening. The plots of moments predicted using the full model and those calculated from link segment mechanics followed each other quite closely. The range of root mean square errors were: 3.2–9.5 Nm for the ankle and 4.7–13.0 Nm for the knee.
Links

DOI: 10.1016/0021-9290(85)90041-7

PubMed: 3980492

WoS: A1985ADH6500002
History

Revised: 1983-06

Revised: 1984-06

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Cited By (30)

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1991	Winter DA. The Biomechanics and Motor Control of Human Gait: Normal, Elderly and Pathological. 2nd ed. Waterloo, ON: University of Waterloo Press; 1991.
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1992	McGill SM. A myoelectrically based dynamic three-dimensional model to predict loads on lumbar spine tissues during lateral bending. J Biomech. April 1992;25(4):395-414.
2008	Winby CR, Lloyd DG, Kirk TB. Evaluation of different analytical methods for subject-specific scaling of musculotendon parameters. J Biomech. 2008;41(8):1682-1688.
2023	Steele JR, Challis JH. Pioneering women of the international society of biomechanics. J Biomech. May 2023;152:111547.
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