ghamari hovayda S, babakhani F, anbariyan M, hajiloo B. Effect of carrying backpack with different loads on electromyography activity of selected lower limb muscles during walking in elementary school students in Hamedan city. RJMS 2016; 23 (148) :89-97 URL: http://rjms.iums.ac.ir/article-1-4041-en.html