Inclusion Criteria- stroke with hemiplegia (duration is 3~6 months after stroke).
- The upper extremity function of participated patients could perform hand grasp and release movements.
Exclusion Criteria- age is younger than 18 years or older than 80 years
- previous history of upper extremity tendon or neuromuscular injury
- any other systemic neuromuscular disease
- cognition or language impairment leading to communication difficulty