The Force Platform Project: How to Compare Jump Height Measured by Different Force Platform Systems?
Master thesis
Published version
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https://hdl.handle.net/11250/3006538Utgivelsesdato
2022Metadata
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Background: Maximal vertical jump height is one of the most frequently reported generic performance variables, both in the scientific literature and when testing athletes. Jump height may be measured in different ways, but the force platform is the most popular method, as it is the only technology that measures the kinetic aspect of a jump. Agreements between force plate systems are important if jump height is to be used as a generic neuromuscular lower body test because various force platform systems are used at different testing facilities. To date, limited information exists regarding the agreement between different commercial hardware and software providers. Purpose: To compare jump height measured by four portable force platform systems.
Methods: The portable force platform systems Kistler, ForceDecks, MuscleLab, and HurLabs, were placed on top of an inground reference force platform (AMTI) to measure the ground reaction forces (GRFs) concurrently during a jump. Squat jumps, countermovement jumps, and drop jumps were analyzed. 3D motion capture was collected simultaneously. The raw force data obtained from both force platform systems concurrently were extracted and analyzed through the same algorithm (set as reference calculation; Hardware). Moreover, the GRFs measured from the portable force platforms were calculated with the reference calculation and their software calculation to obtain jump height (Software).
Results: For all jump modalities, the systematic difference in jump height between the portable systems and the reference system ranged from −2.9% to 3.8% for the Hardware analysis, and from −11.6% to 11.1% for the Software analysis. The typical error of estimate (%) ranged from 1.1% to 5.0% for the Hardware analysis, and from 3.2% to 22.3% for the Software analysis. For all jump modalities and analyses, all force platform systems differed significantly from each other (p < 0.05). Conclusions: Even when applying identical jump protocols and calculation procedures, there were differences in jump height measured by different force platform systems. Different force platforms should be used interchangeably in this way with caution. Software calculations should not be expected to be accurate, and different software cannot be used interchangeably for jump height measures if accuracy of less than 2 ± 2 cm is important. The results of this thesis are useful to understand and interpret jump height measured from different commercial force platform suppliers.
Beskrivelse
Masteroppgave - Norges idrettshøgskole, 2022