Modeling and identification of pendular motion of the lower leg in normal and stroke subjects

J. L. Li, Ming-Shaung Ju, Chou-Ching Lin, K. N. An

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Pendulum test is a common clinical technique for assessing spasticity in stroke patients. In this study a new biomechanical model was built to describe the trajectory of knee joint angle during the pendulum test. In the model the torques contributed by muscles with stretch reflexes, passive tissue and gravity were all considered. By using a constrained optimization method, parameters of the model were obtained by minimizing the squared errors between the experimental data and simulated data. Three normal subjects and one stroke patient were recruited in this study. The preliminary results indicated that, for normal subjects in the relaxed state, the torque acting on the knee was mainly contributed by the soft tissue and gravity. The torque contributed by muscles with stretch reflexes was almost negligible. On the other hand, in the stroke patient, the torque contributed by muscles with stretch reflexes was significant.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalChinese Journal of Medical and Biological Engineering
Volume19
Issue number1
Publication statusPublished - 1999 Aug 24

Fingerprint

Torque
Stretch Reflex
Leg
Stroke
Muscle
Gravitation
Pendulums
Muscles
Tissue
Constrained optimization
Knee Joint
Knee
Trajectories

All Science Journal Classification (ASJC) codes

  • Biophysics

Cite this

@article{4f0b6b9763984078852f6165a8684fdc,
title = "Modeling and identification of pendular motion of the lower leg in normal and stroke subjects",
abstract = "Pendulum test is a common clinical technique for assessing spasticity in stroke patients. In this study a new biomechanical model was built to describe the trajectory of knee joint angle during the pendulum test. In the model the torques contributed by muscles with stretch reflexes, passive tissue and gravity were all considered. By using a constrained optimization method, parameters of the model were obtained by minimizing the squared errors between the experimental data and simulated data. Three normal subjects and one stroke patient were recruited in this study. The preliminary results indicated that, for normal subjects in the relaxed state, the torque acting on the knee was mainly contributed by the soft tissue and gravity. The torque contributed by muscles with stretch reflexes was almost negligible. On the other hand, in the stroke patient, the torque contributed by muscles with stretch reflexes was significant.",
author = "Li, {J. L.} and Ming-Shaung Ju and Chou-Ching Lin and An, {K. N.}",
year = "1999",
month = "8",
day = "24",
language = "English",
volume = "19",
pages = "1--9",
journal = "Journal of Medical and Biological Engineering",
issn = "1609-0985",
publisher = "Biomedical Engineering Society",
number = "1",

}

TY - JOUR

T1 - Modeling and identification of pendular motion of the lower leg in normal and stroke subjects

AU - Li, J. L.

AU - Ju, Ming-Shaung

AU - Lin, Chou-Ching

AU - An, K. N.

PY - 1999/8/24

Y1 - 1999/8/24

N2 - Pendulum test is a common clinical technique for assessing spasticity in stroke patients. In this study a new biomechanical model was built to describe the trajectory of knee joint angle during the pendulum test. In the model the torques contributed by muscles with stretch reflexes, passive tissue and gravity were all considered. By using a constrained optimization method, parameters of the model were obtained by minimizing the squared errors between the experimental data and simulated data. Three normal subjects and one stroke patient were recruited in this study. The preliminary results indicated that, for normal subjects in the relaxed state, the torque acting on the knee was mainly contributed by the soft tissue and gravity. The torque contributed by muscles with stretch reflexes was almost negligible. On the other hand, in the stroke patient, the torque contributed by muscles with stretch reflexes was significant.

AB - Pendulum test is a common clinical technique for assessing spasticity in stroke patients. In this study a new biomechanical model was built to describe the trajectory of knee joint angle during the pendulum test. In the model the torques contributed by muscles with stretch reflexes, passive tissue and gravity were all considered. By using a constrained optimization method, parameters of the model were obtained by minimizing the squared errors between the experimental data and simulated data. Three normal subjects and one stroke patient were recruited in this study. The preliminary results indicated that, for normal subjects in the relaxed state, the torque acting on the knee was mainly contributed by the soft tissue and gravity. The torque contributed by muscles with stretch reflexes was almost negligible. On the other hand, in the stroke patient, the torque contributed by muscles with stretch reflexes was significant.

UR - http://www.scopus.com/inward/record.url?scp=0032858286&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032858286&partnerID=8YFLogxK

M3 - Article

VL - 19

SP - 1

EP - 9

JO - Journal of Medical and Biological Engineering

JF - Journal of Medical and Biological Engineering

SN - 1609-0985

IS - 1

ER -