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Manual Muscle Testing: A Method of Measuring Extremity Muscle Strength Applied to Critically Ill Patients
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Intersession Intra-Rater and Inter-Rater Reliability of Myotonometer for Upper and Lower Extremity Muscles in

Seval Kutlutürk Yıkılmaz1, Tülay Çevik Saldıran2, Özgül Öztürk3

  • 1Department of Physiotherapy and Rehabilitation, Faculty of Hamidiye Health Sciences, University of Health Sciences, 34668 Istanbul, Turkey.

Diagnostics (Basel, Switzerland)
|October 25, 2024
PubMed

Insights

The MyotonPRO device reliably measures muscle tone and stiffness in children with spinal muscular atrophy (SMA) types I and II. This tool accurately quantifies upper and lower extremity mechanical properties for future research.

Area of Science:

  • Biomedical Engineering
  • Neuromuscular Physiology

Background:

  • Spinal muscular atrophy (SMA) types I and II significantly impact muscle function.
  • Objective measurement of muscle mechanical properties is crucial for monitoring disease progression and treatment efficacy in pediatric SMA patients.

Purpose of the Study:

  • To evaluate the intra- and inter-rater reliability of the MyotonPRO device for assessing upper and lower extremity muscle mechanical properties.
  • To determine the reliability of MyotonPRO measurements in children diagnosed with spinal muscular atrophy types I and II.

Main Methods:

  • A cross-sectional study involving 21 children with SMA types I and II.
  • Measurements of muscle tone and stiffness in the biceps brachii, triceps brachii, rectus femoris, and gastrocnemius were performed using the MyotonPRO.
  • Intra-rater reliability was assessed by one examiner performing two measurement sets within 60 minutes, while inter-rater reliability involved a second examiner.

Main Results:

  • Excellent intra- and inter-rater reliability was observed for muscle frequency and stiffness measurements.
  • Good reliability (ICC = 0.71) was found for gastrocnemius muscle stiffness.
  • Minimal detectable change values indicated the precision of the measurements for both muscle tone and stiffness.

Conclusions:

  • The MyotonPRO demonstrates high reliability for quantifying upper and lower extremity muscle mechanical properties in children with SMA types I and II during a single session.
  • This easily applicable device serves as a valuable tool for future research investigating muscle properties in pediatric neuromuscular disorders.

Keywords:
muscle stiffnessmuscle tonemyotonometryreliabilityspinal muscular atrophy

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