TY - JOUR
T1 - Validation of portable muscle tone measurement device for quantifying velocity-dependent properties in elbow spasticity
AU - Lee, Hsin Min
AU - Chen, Jia Jin J.
AU - Ju, Ming Shaung
AU - Lin, Chou Ching K.
AU - Poon, Paul P.W.
N1 - Funding Information:
This research was financially supported by grants from National Health Research Institute (NHRI-EX90-9017EP) and Center of Excellence from Ministry of Education (89-B-FA08-1-4). The authors thank Mr. Hang-Shing Cheng of the Department of Mechanics, National Cheng Kung University, Taiwan, for his assistance on system identification algorithm in this study. We are also grateful to Dr. Thy-Sheng Lin, Dr. Tzyh-Yi Sun and Dr. Ying-Zu Huang of the Department of Neurology, National Cheng Kung University, Taiwan for their generous suggestion and kindly help on the study.
PY - 2004/10
Y1 - 2004/10
N2 - The objective of this study is to develop a portable device for quantifying the velocity-dependent properties of spastic elbow muscles. Based on a motor-driven system, validation tests of the portable system such as accuracy and response of sensors were first examined. Furthermore, simulated modules (inertia, damper and spring) as well as elbow joints (15 control and 15 hemiplegic subjects) were manually stretched under four different frequencies (1/3, 1/2, 1 and 3/2 Hz) through 60° range of motion. Joint resistance and displacement during sinusoidal stretch were collected for further analysis. Two quantitative parameters (i.e., viscous components under each frequency and averaged viscosity across four frequencies) were derived to estimate the velocity-dependent properties of elbow joint. Tests of simulated modules confirm the manual stretch protocol and data analysis are valid in estimating the velocity-dependent component during a sinusoidal stretch. Compared to normal control, viscous component in each stretch frequency and averaged viscosity were significantly higher in subjects with spasticity (P<0.001). The viscous component and averaged viscosity were found highly correlated with the modified Ashworth scale. These findings suggest that measurements of viscous component and averaged viscosity during manual sinusoidal stretching using the portable device could be clinically useful in evaluating spasticity.
AB - The objective of this study is to develop a portable device for quantifying the velocity-dependent properties of spastic elbow muscles. Based on a motor-driven system, validation tests of the portable system such as accuracy and response of sensors were first examined. Furthermore, simulated modules (inertia, damper and spring) as well as elbow joints (15 control and 15 hemiplegic subjects) were manually stretched under four different frequencies (1/3, 1/2, 1 and 3/2 Hz) through 60° range of motion. Joint resistance and displacement during sinusoidal stretch were collected for further analysis. Two quantitative parameters (i.e., viscous components under each frequency and averaged viscosity across four frequencies) were derived to estimate the velocity-dependent properties of elbow joint. Tests of simulated modules confirm the manual stretch protocol and data analysis are valid in estimating the velocity-dependent component during a sinusoidal stretch. Compared to normal control, viscous component in each stretch frequency and averaged viscosity were significantly higher in subjects with spasticity (P<0.001). The viscous component and averaged viscosity were found highly correlated with the modified Ashworth scale. These findings suggest that measurements of viscous component and averaged viscosity during manual sinusoidal stretching using the portable device could be clinically useful in evaluating spasticity.
UR - http://www.scopus.com/inward/record.url?scp=1942544634&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=1942544634&partnerID=8YFLogxK
U2 - 10.1016/j.jelekin.2004.02.002
DO - 10.1016/j.jelekin.2004.02.002
M3 - Article
C2 - 15301776
AN - SCOPUS:1942544634
SN - 1050-6411
VL - 14
SP - 577
EP - 589
JO - Journal of Electromyography and Kinesiology
JF - Journal of Electromyography and Kinesiology
IS - 5
ER -