Preliminary Results on Sensor Placement for Assessing Lower Limb Muscle Strength Using Accelerometer-Based Countermove- ment Jump Data
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Author
Herwegh, Nico
Nemea, Koch
Freyenmuth, Rahel
Lemay, Mathieu
Eser, Prisca
DOI
10.1515/bmt-2025-1001
Abstract
Methods A normative population of 100 healthy individuals, evenly balanced in age and gender, was recruited. AX6 Axivity accelerometer sensors were placed at the chest (with a chest strap), lower back, and hip (the latter two fixed with tape). Participants performed three CMJs on the Leonardo Mechanograph® GW force plate while wearing the sensors. Peak acceleration during the take-off phase was measured for both the sensors and the force plate. The correspondence of the different accelerometer placements in comparison to the force plate data was quantified by the intraclass correlation coefficient (ICC 3,k) .
Results Preliminary data of 10 participants resulted in good reliability (ICC = 0.0.769) for the chest position and moderate reliability for the hip (ICC = 0.503) and poor reliability for lower back (ICC = 0.428).
Conclusion Preliminary results suggest that the chest position is the better position than hip or lower back for estimating ground reaction force from CMJ with accelerometer data. We suspect that hip and lower back are affected more directly from the transition between hip and knee extension and toe off, introducing a greater variance within individuals. Analysis of data from all 100 participants will clarify this hypothesis.
Publication Reference
BMT 2025, Muttenz (Switzerland)
Year
2025-09-11