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Related Experiment Video

Updated: May 20, 2025

Isokinetic Robotic Device to Improve Test-Retest and Inter-Rater Reliability for Stretch Reflex Measurements in Stroke Patients with Spasticity

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Published on: June 12, 2019

Assessing the Test-Retest Reliability of MyotonPRO for Measuring Achilles Tendon Stiffness.

Krystof Volesky¹, Jan Novak¹, Michael Janek¹

¹Faculty of Physical Education and Sport, Charles University, 162 52 Prague, Czech Republic.

Journal of Functional Morphology and Kinesiology

|March 26, 2025

Summary

The MyotonPRO device reliably measures Achilles tendon stiffness over short and long periods. This study confirms its accuracy for clinical research and rehabilitation, aiding tendon monitoring.

Keywords:

Achilles tendon MyotonPRO reliability stiffness tendon

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Area of Science:

Biomechanics
Musculoskeletal Research
Medical Device Technology

Background:

Accurate measurement of Achilles tendon stiffness is crucial for assessing musculoskeletal health and guiding rehabilitation.
The MyotonPRO is a non-invasive device used to quantify mechanical properties of biological tissues.
Establishing the reliability of the MyotonPRO for Achilles tendon assessment is essential for its clinical application.

Purpose of the Study:

To evaluate the test-retest and inter-rater reliability of the MyotonPRO for measuring Achilles tendon stiffness.
To assess reliability across different time frames (minutes, days, weeks) and under various conditions (rest, daily living, sport).
To determine the suitability of the MyotonPRO for clinical research and rehabilitation settings.

Main Methods:

Eight healthy participants underwent six assessment visits.
Achilles tendon stiffness was measured at proximal and distal sites using the MyotonPRO.
Measurements were taken at intervals of 10-15 seconds, 10-15 minutes, 24 hours, and 14 days.
Reliability was assessed using intraclass correlation coefficients (ICC), coefficient of variation, and standard error of measurement.

Main Results:

Excellent short-term (10-15 min) test-retest reliability (ICC = 0.956).
Good reliability was observed between days (24 h, ICC = 0.889) and weeks (2 weeks, ICC = 0.886).
Reliability remained good under simulated daily living (ICC = 0.917) and sport activities (ICC = 0.933).

Conclusions:

The MyotonPRO demonstrates high reliability for repeated measurements of Achilles tendon stiffness when used with a standardized protocol.
The findings support the use of the MyotonPRO in clinical research and rehabilitation for monitoring tendon adaptations.
This study provides a reliable framework for clinicians and researchers to make evidence-based decisions regarding tendon health.