抄録
The displacement of the body's center of gravity in normal subjects was calculated by using-platform with two load cells and strain gauge, a magnetic data recorder, an X-Y recorder and a digital computer under the following conditions.
1. With feet together (closed feet position) and with feet formed at an angle of 60 degrees (open feet position).
2. In normal standing position and the standing positions with head tilted towards the right, left, downward or upward.
The following results were obtained:
1. The total length of the locus followed by the body's center of gravity in forty normal subjects during normal standing with eyes open for 1 minute was 52.0±18.5 cm with closed feet position and 30.8±18.6 cm with open feet position There were some differences observed among the values of different head positions.
2. The ratio of the total length with the eyes closed to that of open during normal standing for 1 minute was 1.56±0.56 with closed feet position and 1.99±1.00 with open feet position. The amount of scatter in calculated values of the open feet position was greater as compared with that of the closed feet position.
3. The length of the displacement of the body's center of gravity with feet together was calculated every 10 seconds. The time course of the length with eyes open was very stable throughout 2 minutes, however, there was a characteristic curve obtained with eyes closed, showing an initial great deflection and afterwards several small deflections.
4. The test-retest reliability of measuring locus of the body's center of gravity was examined using data obtained with one week of interval. No significant difference was statistically proved (p=0.01).
