Evaluation of low back pain factors by measuring the planter pressure.

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In this study, we hypothesized that the planter pressure could estimate the stress of the back muscles. First, we investigated the relationship between the planter pressure distribution and the back muscles stress. According to the tilt angle of the low back, the toe/heel ratio of planter pressure was increased and also increased electro myogram of the low back muscles. Next, we created the insole typed planter pressure data loggers and measured planter pressure of the subjects during several hours. We could estimate the motion of the subjects from the planter pressure. And also we revealed that the longer standing period caused a reason of low back pain among long standing workers.