The Validity of Hawkin Dynamics Wireless Dual Force Plates for Measuring Countermovement Jump and Drop Jump Variables

Andrew J Badby, Peter D Mundy, Paul Comfort, Jason P Lake, John J McMahon, Andrew J Badby, Peter D Mundy, Paul Comfort, Jason P Lake, John J McMahon

Abstract

Force plate testing is becoming more commonplace in sport due to the advent of commercially available, portable, and affordable force plate systems (i.e., hardware and software). Following the validation of the Hawkin Dynamics Inc. (HD) proprietary software in recent literature, the aim of this study was to determine the concurrent validity of the HD wireless dual force plate hardware for assessing vertical jumps. During a single testing session, the HD force plates were placed directly atop two adjacent Advanced Mechanical Technology Inc. in-ground force plates (the "gold standard") to simultaneously collect vertical ground reaction forces produced by 20 participants (27 ± 6 years, 85 ± 14 kg, 176.5 ± 9.23 cm) during the countermovement jump (CMJ) and drop jump (DJ) tests (1000 Hz). Agreement between force plate systems was determined via ordinary least products regression using bootstrapped 95% confidence intervals. No bias was present between the two force plate systems for any of the CMJ and DJ variables, except DJ peak braking force (proportional bias) and DJ peak braking power (fixed and proportional bias). The HD system may be considered a valid alternative to the industry gold standard for assessing vertical jumps because fixed or proportional bias was identified for none of the CMJ variables (n = 17) and only 2 out of 18 DJ variables.

Keywords: accuracy; agreement; concurrent validity; force–time; hardware; vertical jump; wireless dual force plate system.

Conflict of interest statement

This project forms part of the lead author’s PhD research which is jointly funded by the University of Salford and Hawkin Dynamics Inc., the latter of which is the manufacturer of the wireless dual force plate system used in this study. Furthermore, P.D.M., who is the Chief Scientific Officer of Hawkin Dynamics Inc., is the industry supervisor of the PhD research and J.P.L. is the Director of Education for Hawkin Dynamics Inc.

Figures

Figure 1
Figure 1
Example set-up for data collection (frontal plane).
Figure 2
Figure 2
Example set-up for data collection (sagittal plane).
Figure 3
Figure 3
A representative example of an original (top) and time-aligned (bottom) countermovement jump trial recorded by the AMTI (solid grey line) and HD (dotted black line) force plate systems. The bottom graph also illustrates the occurrence of key events. vGRF = vertical ground reaction force.
Figure 4
Figure 4
A representative example of an original (top) and time-aligned (bottom) drop jump trial recorded by the AMTI (solid grey line) and HD (dotted black line) force plate systems. The bottom graph also illustrates the occurrence of key events. vGRF = vertical ground reaction force.

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Source: PubMed

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