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Test-Retest Reliability of the Biodex System 4 Isokinetic Dynamometer for Knee Strength Assessment in Paediatric Populations

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Background: Isokinetic dynamometry is a widely used tool for measuring muscle strength in clinical intervention and rehabilitation as well as research in children. Objective: To assess the test-retest reliability of knee flexor/extensor strength using the Biodex Multi-Joint System 4 Isokinetic Dynamometer in children. Methods: Peak isometric knee extensor (KE) and peak isokinetic knee flexor (KF) torques of the dominant and nondominant limbs were assessed twice in 11 children aged 10 to 13 yrs, 7 to 10 days apart. Results: Peak torques were higher in the dominant limb (p0.006). Peak isometric KE torque was 8.4% higher (SEM 2.5%) at the second testing session, but there was no inter-action with the limb tested (p > 0.2). Peak isokinetic KE/KF torque ratios agreed well between tests and had intraclass correlation coefficients (ICCs) of 0.96. Conclusions: The dynamometer provides a reliable means of assessing knee strength in 10 to 13 year olds, with excellent test-retest reliability for isokinetic KE/KF. A learning effect occurred when assessing isometric torque, indicating the importance of habituation for this measure.
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Document Type: Research Article

Publication date: 01 September 2011

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  • The Journal of Allied Health is the official publication of the Association of Schools of Allied Health Professions (ASAHP). The Journal is the only interdisciplinary allied health periodical, publishing scholarly works related to research and development, feature articles, research abstracts and book reviews. Readers of the Journal comprise allied health leaders, educators, faculty and students.
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