Journal of Exercise Physiology Online

Sairag Saadprai., Bunyong Rungroungdouyboon, Supachai Vorapojpisut, Supattra Silapabanleng, Poonyanat Nualon, "Validity and Reliability of Kinetic Step Box on Vertical Ground Reaction Forces Measurement", Journal of Exercise Physiology Online, Vol. 26(2)., Apr, 2023.

Abstract
              The Kinetic Step Box (KSB) was developed with the purpose for analyzing body movements by detecting vertical Ground Reaction Forces. The purpose of this study was to test the validity and reliability of the vertical Ground Reaction Forces measurement from the KSB compared with the Standard Force Plate (SFP). Thirteen females and seven males performed sitting to standing posture on the KSB and the SFP for 3 sets of 5 times (each set was measured by each rater). All the data were collected on the frequency at 100 Hz/ sec for 2 seconds. The validity of mean vertical Ground Reaction Forces between the SFP and KSB was tested by Pearson’ s Correlation Coefficient. Intra- rater reliability of the SFP and the KSB were calculated by using intraclass correlation coefficient (3,1) and for inter-rater reliability using intraclass correlation coefficient (3,3). The SFP and the KSB had the validity of mean vertical Ground Reaction Forces at the very high level with r at 0. 996. The intra- rater reliability of the SFP and the KSB were at the very high level with r at 1.000 and 1.000. The inter-rater reliability of the SFP and the KSB were at the very high level with r at 1. 000 and 1. 000. The KSB has vertical Ground Reaction Forces measuring capacity like the SFP. The KSB can be used an alternative of the SFP for simple motion measurement. The KSB is low cost, real-time display, and portable.​