The aim of this study is to investigate the difference between skilled workers and beginners focusing on the applied force and the movement of their arms during simplified plastering with mortar. The force was recorded by force plate and the arm movement was recorded by myo-electric potential from four shoulder and forearm muscles. Five skilled workers and seven beginners were selected as the subjects. They plastered with 200g weight mortar at a time. As a result, the force and the myo-electric potential of shoulders by the skilled workers tended to be larger until 1.0s from the rising of the force.
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