Electromyographic assessment of spasticity

Area of Science:

• Neurology
• Biomechanics
• Physiology

Background:

• Muscle tone is a fundamental physiological property influencing movement.
• Spasticity, characterized by altered muscle tone, significantly impacts motor function.
• Understanding the mechanisms of altered muscle tone is crucial for diagnosis and treatment.

Purpose of the Study:

• To define muscle tone and elucidate the signs and symptoms of its alteration in spasticity.
• To identify reliable methods for assessing muscle tone, particularly active tone.
• To analyze changes in myotatic and defense reflexes in spasticity.

Main Methods:

• Definition and description of muscle tone and spasticity.
• Utilizing biomechanical-EMG techniques for measuring active muscle tone.
• Analysis of myotatic, defense, and shortening reflexes in spastic individuals.

Main Results:

• Identified specific, sensitive, and reliable criteria for assessing altered muscle tone: degree of displacement, initiation position, and velocity.
• Detailed the features of myotatic and defense reflexes altered in spasticity.
• Presented results from a personal study on these reflexes and shortening reflexes.

Conclusions:

• Accurate assessment of muscle tone requires considering all influencing inputs and outputs.
• Biomechanical-EMG techniques provide objective measures for active muscle tone.
• Specific reflex parameters offer a reliable basis for evaluating spasticity.