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Objective: To introduce a new hand-driven portable system for measuring the spasticity and to test the availability of the new portable system for measuring the spasticity. Method: Spasticity was evaluated in 15 patients with stroke using a new portable system and the Modified Ashworth scale (MAS). The device was designed in order to measure the joint angle, angular velocity, electromyographic signals, and torque. Each sets of 10 passive elbow joint movements were completed using a new portable system at 60, 90, 120, 150, and 180 degrees per second (deg/s) while surface electromyographic data were collected from the biceps, and triceps. Velocity-dependent dynamic stretch reflex thresholds (DSRTs) were recorded. These values were used to compute tonic stretch reflex threshold (TSRT). The correlations between TSRT and the MAS were investigated. Results: MAS grade was distributed from 1 to 2 grade (1: 40.0%, 1+: 33.3%, 2: 26.7%). TSRT, r2 values ranged from 116.6 to 134.6 and 0.45 to 0.88, respectively. The correlation between MAS grade and TSRT was strong correlation (rho=-0.708, p=0.003). Conclusion: We showed that the new portable system is clinically more useful instrument, which can produce reliable objective data and were more convenient on spasticity measurement. The new measuring system is a portable hand-driven spasticity-measurement system, which encompass various scopes of spasticity-related human signals such as electrophysiologic, kinematic, and biomechanical data. We suggest that this new system can diagnose the spasticity of the muscles, objectively.

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