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Experimental evaluation of human postural balance through lifting loads

We have an interest in the relationship between the human postural balance and back injuries. Although back injuries are the number-one problem facing the workforce in the industry of carrying loads, there appears to be no firm idea on how this will deal with in practice. It is known that the brain plays an important role in maintenance of standing posture. In this paper, we focus on evaluating how the human postural balance is affected under three conditions of lifting loads. Especially, we evaluate the human postural balance during the rising time. We use the spectrum analysis for evaluating the postural balance by using the Nintendo Wii balance board. Through all of experiments, we found the tendency that the heavier loads are, the faster and larger the body swing for balancing the posture during the rising time is. Additionally, the case excluding bending the knee shows the larger swing than that including bending the knee. From all of results, we could hypothesize that an expert of carrying loads may make a balance for the posture during rising time as soon as possible by using the smaller swing motion. We show all of experimental results.