Abstract
The bath room is the place where serious injury accidents might happen. In particular, stepping over bathtub apron is one of the most dangerous motions. There were few studies in which the load of stepping motion was discussed in detail. In order to improve safety of stepping motion for elder people whose muscle forces decline, the load of the motion has to be clarified. The objective of this study was to evaluate the load of stepping over bathtub apron by analyzing muscle activity using musculoskeletal simulation. Compared with gait motion, which is the most daily activity and has less risk of falls, activities of quadratus femoris of trailing foot, both side gluteus maximus, six lateral rotator muscles, trunk muscles and psoas major, were found to be significantly greater. From these muscle activities, it was concluded that the motion requires muscle activities to i) decrease landing shock in advance, ii) stabilize hip motion, iii) control upper body inclination and iv) flex hip to lift foot up.
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