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CC BY-NC-ND V4.0, Open Access
Journal article
Strapped for Strength: A Comparison Study of Dynamometry Techniques to Evaluate Knee Extensor Strength in Inclusion Body Myositis
Muscle & nerve, Vol.72(1), pp.42-48
2025
PMID: 40177792
Appears in Open Access via Read & Publish Agreements
Abstract
Introduction/Aims
Accurate measurement of knee-extensor strength in people with inclusion body myositis (IBM) is vital to track disease progression and provide a standardized outcome for clinical trials. Isokinetic dynamometers are the current gold standard tool for measuring knee-extensor strength. A less costly, more portable tool would have more widespread clinical and research applications. Current practice is to use handheld dynamometry, but there are concerns around the accuracy of this method as it relies on precise operator technique. This study investigates whether stabilization of the handheld dynamometer with a strap (SSHD) improves agreement with the isokinetic dynamometer (IKD) for measurement of knee-extensor strength in IBM participants compared to operator-stabilized handheld dynamometry (OSHD).
Methods
Fifteen IBM participants had bilateral knee-extensor force measured using three methods of dynamometry on the same day: the isokinetic dynamometer, operator-stabilized handheld dynamometry, and strap-stabilized handheld dynamometry. A crossover design was used to account for fatigue bias.
Results
Intraclass correlations (ICC) indicated poor absolute agreement of the IKD with OSHD (Strong leg = 0.240, Weak leg = 0.328), which was better for the SSHD method. Using the SSHD reduced the bias (i.e., there was less underestimation of force) between SSHD and the IKD compared to OSHD and the IKD (p < 0.05), indicating that strap-stabilized handheld dynamometry improved agreement and intraclass correlations with the IKD compared with operator-stabilized dynamometry.
Discussion
Strap-stabilized handheld dynamometry of knee extensor strength is feasible in IBM patients and may correlate better with isokinetic dynamometry than operator-stabilized handheld dynamometry, but larger studies are needed to confirm this finding.
Details
- Title
- Strapped for Strength: A Comparison Study of Dynamometry Techniques to Evaluate Knee Extensor Strength in Inclusion Body Myositis
- Authors/Creators
- Katie Schütze - The University of Notre Dame AustraliaIan Cooper - Perron Institute for Neurological and Translational ScienceBrook Galna - Murdoch UniversityKelly Beer - Perron Institute for Neurological and Translational ScienceTimothy J Fairchild - Murdoch UniversityMadeline Schopp - The University of Notre Dame AustraliaAnna Brusch - Perron Institute for Neurological and Translational ScienceMerrilee Needham - The University of Notre Dame Australia
- Publication Details
- Muscle & nerve, Vol.72(1), pp.42-48
- Publisher
- Wiley Periodicals LLC.
- Number of pages
- 7
- Identifiers
- 991005760133907891
- Copyright
- © 2025 The Author(s)
- Murdoch Affiliation
- Centre for Healthy Ageing; Health Futures Institute; Personalised Medicine Centre; School of Allied Health; Centre for Molecular Medicine and Innovative Therapeutics
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- Citation topics
- 1 Clinical & Life Sciences
- 1.106 Rheumatology
- 1.106.1684 Dermatomyositis
- Web Of Science research areas
- Clinical Neurology
- Neurosciences
- ESI research areas
- Neuroscience & Behavior