The effect of backpack weight on vertebral column deformity of high school girl students

The aim of present study is analysing the effects of students’ backpack’s weight on deformity of their shoulder and vertebral column. In order to do this examination a group of high school girl studentsin Qazvin city are chosen as the statistical society. The measurement instruments include posture screen, meters, scales and questionnaires. The independent variable is the backpack’s weight and the dependent variables are skeletal defects involving unsymmetrical shoulder, scapula asymmetry and deviation of vertebral column. 45 studentscarriedschool backpacks of 10%, 12.5%, 15% and 17.5% bodyweight for 20 minutes. The results show carrying backpacksof 10% bodyweight does not have noticeable effect on progress of dropped shoulder deficiency during the first 5 minutes; however, its destructive impact will appear by passage of time. It is also observed that in the case of heavier backpacksof 12.5%, 15% and 17.5% bodyweight, the harmful effect ofbackpacks loads on the shoulder asymmetry is beingstarted from the first moment