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Journal of the Korean Academy of Rehabilitation Medicine 2000;24(4):637-644.
The Quantitative Measurement of Spasticity Using Change of Muscle Length during Pendulum Test.
Cho, Kang Hee , Chae, Jin Mok , Seo, Jeong Su , Kim, Tae Min , Kim, Bong Ok , Lim, Hyun Kyoon , Lee, Young Shin
1Department of Rehabilitation Medicine, Chungnam National University College of Medicine.
2Department of Mechanical Design Engineering, Chungnam National University.
진자검사시 근육 길이의 변화를 이용한 경직의 정량적 측정
조강희, 채진목, 서정수, 김태민, 김봉옥, 임현균1, 이영신1
충남대학교 의과대학 재활의학교실, 1공과대학 기계설계공학과
Abstract

Objective
The aim of this study was to develop objective evaluation method of spasticity which reflects the characteristics of lengthening velocity-dependent stretch reflex of spasticity.


Method
Kinematic analysis for knee angle and rectus femoris muscle lengthening parameters, and dynamic EMG were performed simultaneously during pendular movement of spastic lower leg for thirty two patients with spasticity and ten normal control subjects. Angular parameters consist of angular relaxation index (ARI), maximal angular velocity (MAV), angular threshold (AT) and angular velocity threshold (AVT). And lengthening parameters consist of lengthening relaxation index (LRI), maximal lengthening velocity (MLV), lengthening threshold (LT) and lengthening velocity threshold (LVT).


Results
1) ARI, MAV, AT, and AVT according to Modified Ashworth scale (MAS) were 1.32⁑0.11, 303.84⁑45.11 deg/sec, 44.19⁑13.81 deg, 262.15⁑33.54 deg/sec in MAS I, 1.16⁑0.16, 279.92⁑42.94 deg/sec, 30.33⁑6.02 deg, 247.65⁑35.92 deg/sec in MAS II, and 0.95⁑0.14, 241.31⁑19.98 deg/sec, 20.55⁑2.68 deg, 209.11⁑48.11 deg/sec in MAS III (P<0.05). 2) LRI, MLV, LT, and LVT according to MAS were 1.27⁑0.11, 0.58⁑0.07, 1.164⁑0.14, 0.53⁑0.05 in MAS I, 1.12⁑0.09, 0.53⁑0.05, 1.150⁑0.08, 0.42⁑0.04 in MAS II, and 0.99⁑0.10, 0.44⁑0.01, 1.137⁑0.15, 0.36⁑0.02 in MAS III (P<0.05). 3) There were significant correlation between various pendulum test parameters and MAS.


Conclusion
Muscle lengthening parameters as well as knee angular parameters were sensitive parameters reflecting the degree of spasticity. LVT is the most sensitive parameter among all parameters (p<0.01).

Key Words: Pendulum test, Spasticity, Muscle length, Modified Ashworth scale


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