Intra-rater and Inter-rater Reliability of the KangaTech (KT360) Fixed Frame Dynamometry System During Maximal Isometric Strength Measurements of the Knee Flexors.
Ellie Woolhead, Richard Partner, Megan Parsley and 1 others
PMID 39502541WHAT IT FOUND
Knee flexor strength measured by the same tester and by different testers using this portable fixed-frame dynamometer was almost perfectly consistent, with small measurement error.
It can support repeat testing, but direct comparison with the standard device was not done.
Key findings
01The device showed almost perfect agreement between repeated measurements by the same rater and between measurements by different raters.
02The minimal detectable change values ranged from 1.87 to 2.31 kg.
03The agreement analysis showed 95% of differences within 2 standard deviations of the mean.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study used 20 healthy university-level athletes, so the results may not apply to injured, non-sporting, or different age groups. The device was tested only in the 90° hip and knee flexion position, so reliability in other testing positions was not established. The study did not directly compare this device with isokinetic dynamometry in the same participants, so agreement with the gold standard was not shown. Some hip extension may have occurred during maximal contraction because the hips and trunk were not fixed, which could affect the measured values.
Declared interests
The authors declared no conflicts of interest. The research received no specific funding, but was performed as part of their employment or academic qualification at Leeds Beckett University.
The easy way to misread this
Do not conclude this device is interchangeable with isokinetic dynamometry. The study only showed agreement between repeated measurements by raters. It did not compare this device with isokinetic dynamometry in the same participants.