NDLI: Comparison of Neuromuscular Abnormalities between Upper and Lower Extremities in Hemiparetic Stroke

Content Provider	IEEE Xplore Digital Library
Author	Mirbagheri, M.M. AliBiglou, L. Thajchayapong, M. Lilaonitkul, T. Rymer, W.Z.
Copyright Year	2006
Description	Author affiliation: Dept. of Phys. Medicine & Rehabilitation, Northwestern Univ., Evanston, IL (Mirbagheri, M.M.)
Abstract	We studied the neuromuscular mechanical properties of the elbow and ankle joints in chronic, hemiparetic stroke patients and healthy subjects. System identification techniques were used to characterize the mechanical abnormalities of these joints and to identify the contribution of intrinsic and reflex stiffness to these abnormalities. Modulation of intrinsic and reflex stiffness with the joint angle was studied by applying PRBS perturbations to the joint at different joint angles. The experiments were performed for both spastic (stroke) and contralateral (control) sides of stroke patients and one side of healthy (normal) subjects. We found reflex stiffness gain $(G_{R})$ was significantly larger in the stroke than the control side for both elbow and ankle joints. $G_{R}$ was also strongly position dependent in both joints. However, the modulation of $G_{R}$ with position was slightly different in two joints. $G_{R}$ was also larger in the control than the normal joints but the differences were significant only for the ankle joint. Intrinsic stiffness gain (K) was also significantly larger in the stroke than the control joint at elbow extended positions and at ankle dorsiflexed positions. Modulation of K with the ankle angle was similar for stroke, control and normal groups. In contrast, the position dependency of the elbow was different. K was larger in the control than normal ankle whereas it was lower in the control than normal elbow. However, the differences were not significant for any joint. The findings demonstrate that both reflex and intrinsic stiffness gain increase abnormally in both upper and lower extremities. However, the major contribution of intrinsic and reflex stiffness to the abnormalities is at the end of ROM and at the middle ROM, respectively. The results also demonstrate that the neuromuscular properties of the contralateral limb are not normal suggesting that it may not be used as a suitable control at least for the ankle study
Sponsorship	IEEE EMB
Starting Page	303
Ending Page	306
File Size	337005
Page Count	4
File Format	PDF
ISBN	1424400325
ISSN	1557170X
DOI	10.1109/IEMBS.2006.260530
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-08-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Neuromuscular Extremities Elbow Mechanical factors System identification Read only memory Muscles Torque Cities and towns USA Councils identification spasticity stiffness reflex intrinsic elbow ankle stroke
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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