Reliability and validity of impact absorption rate using accelerometers during single-leg drop-jump landings.
Yasushi Kurihara, Hironori Ohsugi, Hiroshi Karasuno and 2 others
PMID 37915453WHAT IT FOUND
In 18 healthy adult males, an accelerometer-based measure of landing impact during a single-leg drop-jump was repeatable by one tester and by two testers, and it tracked a force-plate measure of how fast landing force peaked.
Key findings
01The impact absorption rate was strongly positively correlated with loading rate (r=0.71, p<0.01).
02One tester repeated three measurements: a single measurement had ICC(1,1) 0.89, and the mean of three measurements had ICC(1,3) 0.96.
03Two testers repeated three measurements: a single measurement had ICC(2,1) 0.88, and the mean of three measurements had ICC(2,3) 0.94.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Participants were 18 healthy adult males, not athletes with ankle sprain or chronic ankle instability. For inter-rater reliability, 12 of 18 participants were analysed because six dropped out. The validity correlation used Tester A's data only, not both testers. All participants landed with forefoot contact, and the accuracy of the footswitch timing signal was not determined, so other foot contact patterns may affect the time variable. No specific instructions were given about knee flexion or other landing technique, so participants may have used different strategies. The study measured agreement and correlation, not whether the score changes clinical decisions or patient outcomes.
Declared interests
The authors declared no conflict of interest.
The easy way to misread this
Do not read this as evidence that an accelerometer-based impact absorption rate can guide return-to-sport decisions after ankle sprain. It was tested only in 18 healthy adult males during a single-leg drop-jump landing, and no injured athletes or clinical outcomes were measured.