A difference of human posture between beginner and expert during lifting a heavy load

We focused on what is the difference of human posture during lifting a heavy load between a beginner and an expert who has been working in the logistics industry. Although there have been a lot of studies to analyze the human motion through the mathematical modeling, we proposed the method to estimate the bending angle of human upper body through the analysis of the human balance by using the Nintendo wii balance board in order to find out the cause of low back pain in the logistics industry. The proposed method has a good point to measure without the limitation of environment. We analyzed two experts and two beginners without the low back pain in the logistics industry in order to make sure the difference between an expert and a beginner. Through all of analyses, we found that experts had an approaching motion to the load with the less bending angle, and they had the slower unbending motion than that of beginner during lifting the load. That meant that experts bended down to pick up the load with the less bending angle, and they stood up with the slower motion while lifting the load. Thus, experts became the faster steady state than beginners.