Purpose. The objective of the present study was to digitally express a common daily movement of sitting down (seating maneuver), and to show an analytical example of normative indices of such a daily movement. Basic procedures. Sequential traces of moments and the center of pressure (COP) during the seating maneuver, approaching with steps to and sitting on a stool, were measured using two force plates, and we decided on normal ranges of parameters based on the vertical moment and lateral deviation of the COP. In addition to the normal data recorded from ten healthy subjects, a data set from a patient was plotted. Main findings. Normative indices to express the sequential movement were obtained. The patient showed abnormal values of the indices, which could be quantitative indicators to evaluate the normality and grade of abnormality. Conclusions. We introduced a method for the quantitative screening of a daily movement using force plates. The results showed normative values, and the method could be used to reveal abnormalities in a daily movement in a patient with mild movement disability.
Key words: force plate, sitting, pressure center, human