Effects of Daily Used Bags on Biomechanics Characteristic of Elementary Students

In order to evaluate the effects on biomechanics characteristic of daily used bags of elementary students, we select three different types of marketable school bags (backpack A with shoulder cushion design, backpack B with shoulder-back cushion design and Japanese backpack C with bio-mechanics optimization design). The mFLEX, Codamotion and Footscan were used to measure shoulder pressure, back pressure, body posture and plantar pressure on 8 elementary students (male and female ratio 3 to 5) with different loads equivalent to 5%, 10%, 15%, 20% and 25% of their body weights. The results showed that the value of shoulder pressure, back pressure and trunk leaning angle change linearly with the load increasing, there is no significant impact of plantar pressure value. But, different bags significantly impacts on shoulder pressure and back pressure and body posture. Evaluation results showed that two optimization design bags (B and C) had no advantages on decreasing shoulder pressure, back pressure and trunk leaning angle.