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Reliability of Dynamic Shoulder Strength Test Battery Using Multi-Joint Isokinetic Device
Gustavo García-Buendía1,2, Ángela Rodríguez-Perea1,2,3, Ignacio Chirosa-Ríos1,2
1Department of Physical Education and Sport, Faculty of Sports Sciences, University of Granada, 18011 Granada, Spain.
Sensors (Basel, Switzerland)
|June 19, 2024
Summary
This study found that isokinetic strength tests for shoulder movements are highly reliable in active adults. Concentric force measurements demonstrated the best reliability across all tested shoulder actions.
Area of Science:
- Biomechanics
- Kinesiology
- Sports Medicine
Background:
- Shoulder strength assessment is crucial for evaluating athletic performance and injury rehabilitation.
- Isokinetic dynamometry is a common method for measuring joint strength, but its reliability for specific shoulder movements needs validation.
Purpose of the Study:
- To determine the absolute and relative reliability of concentric and eccentric shoulder strength measurements.
- To assess the reliability of flexion, extension, horizontal abduction, and adduction using a functional electromechanical dynamometer (FEMD).
Main Methods:
- Forty-three active male university students performed isokinetic tests at 0.80 m/s.
- Concentric and eccentric strength for shoulder flexion, extension, horizontal abduction, and adduction were measured.
- Intraclass correlation coefficients (ICCs), standard error of measurement (SEM), and coefficient of variation (CV) were used to quantify reliability.
Main Results:
- Reliability for all tested shoulder movements (concentric and eccentric) was very high to extremely high (ICC: 0.76-0.94).
- Absolute reliability measures showed SEM ranging from 0.63-6.57% and CV from 9.40-19.63%.
- Mean concentric force was identified as the most reliable strength measure across all tests.
Conclusions:
- Isokinetic strength testing of the shoulder demonstrates excellent absolute and relative reliability in asymptomatic adults.
- The findings support the use of FEMD for accurate and repeatable assessment of shoulder strength.
- Concentric force measurements offer the highest reliability for shoulder strength evaluations.
