Estimating Torque-Angle Relations of Human Elbow Joint in Isovelocity Flexion Movements

Kenzo AKAZAWA; Ryuhei OKUNO

doi:10.1093/ietisy/e89-d.11.2802

Estimating Torque-Angle Relations of Human Elbow Joint in Isovelocity Flexion Movements

Kenzo AKAZAWA, Ryuhei OKUNO

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We investigated relations between torque and elbow joint angle for constant muscle activations in isovelocity flexion movements of the forearm in three normal subjects. The reference angular velocity was from 0 to 90°/s and the applied torque from 0 to 15% of maximum voluntary contraction. Integrated surface electromyograms (IEMGs) of six muscles, torque, angle and angular velocity of the elbow joint were measured. A mathematical model describing the relationship between these variables was constructed with an artificial neural network. We estimated elbow joint torque by presenting different elbow joint angles, constant IEMGs and constant angular velocity to the model. For elbow joint angles greater than 60°, the slope, which was defined as the rate of torque increase with respect to elbow joint angle, was negative. For elbow joint angles less than 50°, the slope changed from positive to negative when the angular velocity increased. This implied that the flexor muscle-elbow joint system could change from unstable to stable when the angular velocity increased.

Publication: IEICE TRANSACTIONS on Information Vol.E89-D No.11 pp.2802-2810

Publication Date: 2006/11/01

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Online ISSN: 1745-1361

DOI: 10.1093/ietisy/e89-d.11.2802

Type of Manuscript: PAPER

Category: Biological Engineering

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Kenzo AKAZAWA, Ryuhei OKUNO, "Estimating Torque-Angle Relations of Human Elbow Joint in Isovelocity Flexion Movements" in IEICE TRANSACTIONS on Information, vol. E89-D, no. 11, pp. 2802-2810, November 2006, doi: 10.1093/ietisy/e89-d.11.2802.
Abstract: We investigated relations between torque and elbow joint angle for constant muscle activations in isovelocity flexion movements of the forearm in three normal subjects. The reference angular velocity was from 0 to 90°/s and the applied torque from 0 to 15% of maximum voluntary contraction. Integrated surface electromyograms (IEMGs) of six muscles, torque, angle and angular velocity of the elbow joint were measured. A mathematical model describing the relationship between these variables was constructed with an artificial neural network. We estimated elbow joint torque by presenting different elbow joint angles, constant IEMGs and constant angular velocity to the model. For elbow joint angles greater than 60°, the slope, which was defined as the rate of torque increase with respect to elbow joint angle, was negative. For elbow joint angles less than 50°, the slope changed from positive to negative when the angular velocity increased. This implied that the flexor muscle-elbow joint system could change from unstable to stable when the angular velocity increased.
URL: https://global.ieice.org/en_transactions/information/10.1093/ietisy/e89-d.11.2802/_p

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@ARTICLE{e89-d_11_2802,
author={Kenzo AKAZAWA, Ryuhei OKUNO, },
journal={IEICE TRANSACTIONS on Information},
title={Estimating Torque-Angle Relations of Human Elbow Joint in Isovelocity Flexion Movements},
year={2006},
volume={E89-D},
number={11},
pages={2802-2810},
abstract={We investigated relations between torque and elbow joint angle for constant muscle activations in isovelocity flexion movements of the forearm in three normal subjects. The reference angular velocity was from 0 to 90°/s and the applied torque from 0 to 15% of maximum voluntary contraction. Integrated surface electromyograms (IEMGs) of six muscles, torque, angle and angular velocity of the elbow joint were measured. A mathematical model describing the relationship between these variables was constructed with an artificial neural network. We estimated elbow joint torque by presenting different elbow joint angles, constant IEMGs and constant angular velocity to the model. For elbow joint angles greater than 60°, the slope, which was defined as the rate of torque increase with respect to elbow joint angle, was negative. For elbow joint angles less than 50°, the slope changed from positive to negative when the angular velocity increased. This implied that the flexor muscle-elbow joint system could change from unstable to stable when the angular velocity increased.},
keywords={},
doi={10.1093/ietisy/e89-d.11.2802},
ISSN={1745-1361},
month={November},}

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TY - JOUR
TI - Estimating Torque-Angle Relations of Human Elbow Joint in Isovelocity Flexion Movements
T2 - IEICE TRANSACTIONS on Information
SP - 2802
EP - 2810
AU - Kenzo AKAZAWA
AU - Ryuhei OKUNO
PY - 2006
DO - 10.1093/ietisy/e89-d.11.2802
JO - IEICE TRANSACTIONS on Information
SN - 1745-1361
VL - E89-D
IS - 11
JA - IEICE TRANSACTIONS on Information
Y1 - November 2006
AB - We investigated relations between torque and elbow joint angle for constant muscle activations in isovelocity flexion movements of the forearm in three normal subjects. The reference angular velocity was from 0 to 90°/s and the applied torque from 0 to 15% of maximum voluntary contraction. Integrated surface electromyograms (IEMGs) of six muscles, torque, angle and angular velocity of the elbow joint were measured. A mathematical model describing the relationship between these variables was constructed with an artificial neural network. We estimated elbow joint torque by presenting different elbow joint angles, constant IEMGs and constant angular velocity to the model. For elbow joint angles greater than 60°, the slope, which was defined as the rate of torque increase with respect to elbow joint angle, was negative. For elbow joint angles less than 50°, the slope changed from positive to negative when the angular velocity increased. This implied that the flexor muscle-elbow joint system could change from unstable to stable when the angular velocity increased.
ER -