A new method for measuring motor block in the lower extremities

Area of Science:

• Biomedical Engineering
• Geriatric Medicine
• Neurology

Background:

• Assessing lower extremity muscle strength is crucial for elderly health.
• Existing methods may have limitations in clinical settings or during anesthesia.

Purpose of the Study:

• To develop and evaluate a novel method for quantifying muscle strength in the lower extremities.
• To assess the clinical applicability of this method in healthy elderly subjects and during regional anesthesia.

Main Methods:

• A new apparatus was used to measure isometric muscle strength during hip flexion, knee extension, and plantar flexion.
• Measurements were conducted on ten healthy elderly subjects and one subject under spinal anesthesia.
• Electromechanical performance and measurement errors were analyzed.

Main Results:

• The apparatus demonstrated stable electromechanical performance with low measurement errors (4-11%).
• Repeated measurements over 4 hours were well-tolerated by subjects without fatigue.
• Low variation in isometric muscle strength was observed (average coefficient of variation ~10%).
• The method successfully quantified motor block during spinal anesthesia.

Conclusions:

• The developed method is a reliable and quantitative tool for bilateral, three-joint muscle strength measurements.
• This technique is suitable for evaluating muscle strength in the elderly and is applicable during regional anesthesia for motor block assessment.