[Analysis of Correlation between Surface Electromyography and Spasticity after Stroke].

Area of Science:

• Neuroscience
• Biomedical Engineering
• Rehabilitation Medicine

Background:

• Stroke survivors often experience upper-limb spasticity, impacting motor function and recovery.
• Accurate quantitative assessment of spasticity is crucial for effective clinical rehabilitation strategies.

Purpose of the Study:

• To explore the relationship between surface electromyography (sEMG) characteristic indexes and upper-limb spasticity in stroke patients.
• To provide an electrophysiological basis for the quantitative evaluation of spasticity in the recovery stage.

Main Methods:

• Ten patients with post-stroke spasticity were assessed using the modified Ashworth scale (MAS).
• Passive elbow sinusoidal motion experiments were conducted while recording sEMG from biceps brachii and triceps brachii.
• Analysis focused on characteristic sEMG indexes, including the reflex electromyographic threshold.

Main Results:

• The reflex electromyographic threshold demonstrated a significant correlation with the MAS.
• sEMG characteristic indexes, particularly the reflex threshold, reflect the physiological mechanisms underlying spasticity.
• These findings suggest sEMG is a valuable tool for quantitative spasticity evaluation.

Conclusions:

• Surface electromyography offers a promising method for the quantitative clinical evaluation of upper-limb spasticity in stroke patients.
• The reflex electromyographic threshold is a key indicator correlating with clinical spasticity measures.
• This research supports the integration of sEMG into rehabilitation protocols for stroke recovery.