The test subjects were selected from patients with clinical manifestations in muscle tone and healthy volunteers. Elbow flexor is the main target muscle. Fifty patients and 50 healthy subjects were given three assessment methods to measure muscle tension: modified Ashworth rating scale, elastic ultrasound technology and surface electromyography, and the data obtained by these three methods will be statistically analyzed and discussed.

Inclusion Criteria:

• There are clinical manifestations of changes in muscle tension of the elbow flexor group;
• Subject's diagnosis is clear;
• The degree of joint mobility meets the method of muscle tension assessment.

Exclusion Criteria:

• Has serious diseases such as heart, lung, liver, kidney, etc., cardiac function grade is greater than Grade I (NYHA), has symptoms and signs or examination results such as respiratory failure;
• History of muscle disorders;
• Recent (within 6 months) history of external injury, fracture or surgery of the limb;
• Are using drugs that affect muscle tone;
• Severe osteoporosis;
• Acute phase of inflammation
• Acute limb thrombosis of the subject;
• Pregnancy.

This study is expected to recruit 50 patients with clinical changes in flexion of the elbow flexor and 50 healthy subjects to participate in the study.