Quantification of spasticity: Identification of reflex and intrinsic mechanical properties

M. M. Mirbagheri; D. Chen; R. A. Harvey; W. Z. Rymer

doi:10.1109/CNE.2003.1196823

Quantification of spasticity: Identification of reflex and intrinsic mechanical properties

M. M. Mirbagheri, D. Chen, R. A. Harvey, W. Z. Rymer

Physical Medicine and Rehabilitation

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

A parallel-cascade system identification technique was used to measure dynamic elbow stiffness in spinal cord injured (SCI), hemiparetic stroke and normal subjects. Modulation of intrinsic and reflex stiffness of elbow flexor muscles was studied by applying perturbations to the elbow at different initial joint angles with subjects' muscles relaxed. We found that reflex stiffness was similar in both spastic SCI and stroke subjects and was significantly larger than in normal subjects. The difference reached its maximum at the middle of elbow extension. Intrinsic stiffness was larger in SCI than normal subjects, whereas it was within normal range in stroke arms. The mechanical properties of the contralateral arms in stroke subjects were not normal; reflex stiffness was larger and intrinsic stiffness was lower. Both reflex and intrinsic stiffness were strongly position dependent; they both increased with increasing elbow extension. These findings demonstrate that increased reflex stiffness is the major mechanical abnormalities in SCI and stroke whereas enhanced intrinsic stiffness is important only in SCI subjects. Moreover, the contralateral side of stroke subjects is also affected.

Original language	English (US)
Title of host publication	Conference Proceedings - 1st International IEEE EMBS Conference on Neural Engineering
Editors	Laura J. Wolf, Jodi L. Strock
Publisher	IEEE Computer Society
Pages	313-315
Number of pages	3
ISBN (Electronic)	0780375793
DOIs	https://doi.org/10.1109/CNE.2003.1196823
State	Published - 2003
Event	1st International IEEE EMBS Conference on Neural Engineering - Capri Island, Italy Duration: Mar 20 2003 → Mar 22 2003

Publication series

Name	International IEEE/EMBS Conference on Neural Engineering, NER
Volume	2003-January
ISSN (Print)	1948-3546
ISSN (Electronic)	1948-3554

Other

Other	1st International IEEE EMBS Conference on Neural Engineering
Country/Territory	Italy
City	Capri Island
Period	3/20/03 → 3/22/03

Keywords

Arm
Elbow
Lesions
Mechanical factors
Medical diagnostic imaging
Muscles
Nervous system
Spinal cord
System identification
Torque

ASJC Scopus subject areas

Artificial Intelligence
Mechanical Engineering

Access to Document

10.1109/CNE.2003.1196823

Cite this

Mirbagheri, M. M., Chen, D., Harvey, R. A., & Rymer, W. Z. (2003). Quantification of spasticity: Identification of reflex and intrinsic mechanical properties. In L. J. Wolf, & J. L. Strock (Eds.), Conference Proceedings - 1st International IEEE EMBS Conference on Neural Engineering (pp. 313-315). Article 1196823 (International IEEE/EMBS Conference on Neural Engineering, NER; Vol. 2003-January). IEEE Computer Society. https://doi.org/10.1109/CNE.2003.1196823

Mirbagheri, M. M. ; Chen, D. ; Harvey, R. A. et al. / Quantification of spasticity : Identification of reflex and intrinsic mechanical properties. Conference Proceedings - 1st International IEEE EMBS Conference on Neural Engineering. editor / Laura J. Wolf ; Jodi L. Strock. IEEE Computer Society, 2003. pp. 313-315 (International IEEE/EMBS Conference on Neural Engineering, NER).

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title = "Quantification of spasticity: Identification of reflex and intrinsic mechanical properties",

abstract = "A parallel-cascade system identification technique was used to measure dynamic elbow stiffness in spinal cord injured (SCI), hemiparetic stroke and normal subjects. Modulation of intrinsic and reflex stiffness of elbow flexor muscles was studied by applying perturbations to the elbow at different initial joint angles with subjects' muscles relaxed. We found that reflex stiffness was similar in both spastic SCI and stroke subjects and was significantly larger than in normal subjects. The difference reached its maximum at the middle of elbow extension. Intrinsic stiffness was larger in SCI than normal subjects, whereas it was within normal range in stroke arms. The mechanical properties of the contralateral arms in stroke subjects were not normal; reflex stiffness was larger and intrinsic stiffness was lower. Both reflex and intrinsic stiffness were strongly position dependent; they both increased with increasing elbow extension. These findings demonstrate that increased reflex stiffness is the major mechanical abnormalities in SCI and stroke whereas enhanced intrinsic stiffness is important only in SCI subjects. Moreover, the contralateral side of stroke subjects is also affected.",

keywords = "Arm, Elbow, Lesions, Mechanical factors, Medical diagnostic imaging, Muscles, Nervous system, Spinal cord, System identification, Torque",

author = "Mirbagheri, {M. M.} and D. Chen and Harvey, {R. A.} and Rymer, {W. Z.}",

note = "Publisher Copyright: {\textcopyright} 2003 IEEE.; 1st International IEEE EMBS Conference on Neural Engineering ; Conference date: 20-03-2003 Through 22-03-2003",

year = "2003",

doi = "10.1109/CNE.2003.1196823",

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series = "International IEEE/EMBS Conference on Neural Engineering, NER",

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Mirbagheri, MM, Chen, D , Harvey, RA & Rymer, WZ 2003, Quantification of spasticity: Identification of reflex and intrinsic mechanical properties. in LJ Wolf & JL Strock (eds), Conference Proceedings - 1st International IEEE EMBS Conference on Neural Engineering., 1196823, International IEEE/EMBS Conference on Neural Engineering, NER, vol. 2003-January, IEEE Computer Society, pp. 313-315, 1st International IEEE EMBS Conference on Neural Engineering, Capri Island, Italy, 3/20/03. https://doi.org/10.1109/CNE.2003.1196823

Quantification of spasticity: Identification of reflex and intrinsic mechanical properties. / Mirbagheri, M. M.; Chen, D.; Harvey, R. A. et al.
Conference Proceedings - 1st International IEEE EMBS Conference on Neural Engineering. ed. / Laura J. Wolf; Jodi L. Strock. IEEE Computer Society, 2003. p. 313-315 1196823 (International IEEE/EMBS Conference on Neural Engineering, NER; Vol. 2003-January).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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N2 - A parallel-cascade system identification technique was used to measure dynamic elbow stiffness in spinal cord injured (SCI), hemiparetic stroke and normal subjects. Modulation of intrinsic and reflex stiffness of elbow flexor muscles was studied by applying perturbations to the elbow at different initial joint angles with subjects' muscles relaxed. We found that reflex stiffness was similar in both spastic SCI and stroke subjects and was significantly larger than in normal subjects. The difference reached its maximum at the middle of elbow extension. Intrinsic stiffness was larger in SCI than normal subjects, whereas it was within normal range in stroke arms. The mechanical properties of the contralateral arms in stroke subjects were not normal; reflex stiffness was larger and intrinsic stiffness was lower. Both reflex and intrinsic stiffness were strongly position dependent; they both increased with increasing elbow extension. These findings demonstrate that increased reflex stiffness is the major mechanical abnormalities in SCI and stroke whereas enhanced intrinsic stiffness is important only in SCI subjects. Moreover, the contralateral side of stroke subjects is also affected.

AB - A parallel-cascade system identification technique was used to measure dynamic elbow stiffness in spinal cord injured (SCI), hemiparetic stroke and normal subjects. Modulation of intrinsic and reflex stiffness of elbow flexor muscles was studied by applying perturbations to the elbow at different initial joint angles with subjects' muscles relaxed. We found that reflex stiffness was similar in both spastic SCI and stroke subjects and was significantly larger than in normal subjects. The difference reached its maximum at the middle of elbow extension. Intrinsic stiffness was larger in SCI than normal subjects, whereas it was within normal range in stroke arms. The mechanical properties of the contralateral arms in stroke subjects were not normal; reflex stiffness was larger and intrinsic stiffness was lower. Both reflex and intrinsic stiffness were strongly position dependent; they both increased with increasing elbow extension. These findings demonstrate that increased reflex stiffness is the major mechanical abnormalities in SCI and stroke whereas enhanced intrinsic stiffness is important only in SCI subjects. Moreover, the contralateral side of stroke subjects is also affected.

KW - Arm

KW - Elbow

KW - Lesions

KW - Mechanical factors

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KW - Muscles

KW - Nervous system

KW - Spinal cord

KW - System identification

KW - Torque

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SP - 313

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BT - Conference Proceedings - 1st International IEEE EMBS Conference on Neural Engineering

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PB - IEEE Computer Society

Y2 - 20 March 2003 through 22 March 2003

ER -

Mirbagheri MM, Chen D , Harvey RA , Rymer WZ. Quantification of spasticity: Identification of reflex and intrinsic mechanical properties. In Wolf LJ, Strock JL, editors, Conference Proceedings - 1st International IEEE EMBS Conference on Neural Engineering. IEEE Computer Society. 2003. p. 313-315. 1196823. (International IEEE/EMBS Conference on Neural Engineering, NER). doi: 10.1109/CNE.2003.1196823

Quantification of spasticity: Identification of reflex and intrinsic mechanical properties

Abstract

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Keywords

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