[Khouli et. al., Vol.5 (Iss.9): September 2018] ISSN: 2454-1907 DOI: 10.5281/zenodo.1435164 Http://www.ijetmr.com©International Journal of Engineering Technologies and Management Research [23] THE EFFECT WEIGHT OF BACKPACK ON POSTURAL CONTROL AMONG PREP SCHOOL STUDENTS IN TANTA CITY Mohamed N. Al Khouli *1 , Anees S. Ghait *2 , Amr A. Abogazya *3 *1 Department of Growth& Development disorders and its Surgery in Pediatric, Delta University for Science and Technology, Egypt. *2 Department of Biomechanics, Kafrelsheikh University, Egypt. *3 Department of Basic Science, Faculty of Physical Therapy, Kafrelsheikh University, Egypt Abstract: Background: The aim of this study was to evaluate the changes in postural control and stability among prep school students in Tanta city with and without backpacks. Method: The study was conducted with a sample of 30 children, 16 boys and 14 girls with a mean age (years) 13 + 1.03, body mass (kg) 40.6 + 10.14, height (m) 1, 50 + 0.15, BMI (kg / m²) 20.25 + 3.70. Samples were selected randomly, divided into 2 equal groups. Group (A):15 Participants tested with back packs, group (B): 15 Participants tested without back packs. Balance assessment was done in biomechanics lab, faculty of physical therapy, Delta University for Science & Technology. The dynamic balance parameters (Anterior posterior (AP), Mediolateral (ML) and Overall (OA) stability indices) measured by Biodex Balance System at stability level-7, with standard load (3 kg), based on average back pack mass of the volunteers. Results: the results suggest there was statistical significant difference between both groups (A&B) (P< 0.05). There is decrease in balance parameters including (OA, AP and MLindices) at seven level of stability during the dynamic balance test in group A which tested with back packs compared with group B which tested without backpacks. Conclusions: When comparing between the mean values of participant's stability indices (OA, AP and ML) at stability level-7 within the same group (A or B), there was no statistical significant difference (P> 0.05). Keywords: Postural Control; Stability; Backpack; Balance; Prep School Students. Cite This Article: Mohamed N. AlKhouli, Anees S. Ghait, and Amr A.Abogazya. (2018). “THE EFFECT WEIGHT OF BACKPACK ON POSTURAL CONTROL AMONG PREP SCHOOL STUDENTS IN TANTA CITY.” International Journal of Engineering Technologies and Management Research, 5(9), 23-29. DOI: 10.5281/zenodo.1435164. 1. Introduction The use of backpacks covers almost all of the children who attend the school. The scope of the use of such material by school children is by its utility, since the bags are presented as a suitable device for transporting loads in the column next to and symmetric shape while maintaining stability. (1).