Mohamed M. Eldesoky, Neveen A. Abd-Elraouf, Khaled E. Ayad, & Enas E. Abu-Taleb
The study protocol, aim and importance were explained to all the participants. A written agreement form was signed by each participant. All the participants caught the iphone device containing the SBS in the upright position with the screen facing their mid of sternum and pressed it against their sternum while performed four tests (foot together, semi tandem, tandem and single leg stance) all done with eyes opened while the participant standing on the platform of the BBS (performing the test on BBS and the SBS at the same time as it is concurrent validity test) fig.1, 2, 3&4. The dominant leg was the leg in front in both tandem and semi tandem positions and the leg of weight bearing in the single leg stance position. Each test was done for 10 seconds and all participants performed experimental trials on level 8 Biodex Balance System difficulty with a familiarization trail prior to it. The overall stability index for each test was collected from experimental trial of each participant on both BBS and the same the overall postural sway was collected from SBS for each test and statistically analyzed.