Abstract
Normal stabilogram were examined in 38 subjects, 38 males and 7 females, aged 30 to 62 years, standing erect in Romberg's posture with eyes open and with eyes closed. From analog data of body sways in both lateral (RL) and anterior-posterior (AP) directions, digital data of 51.2 sec duration with a sampling time 50 msec were obtained in each case. Each serial partial statokinesigram of 5 or 10 msec duration was displayed on rectangular coordinates, the origin of which was fixed at the mean value of each location of the center of gravity during 51.2 sec with the use of a microcomputer (NEC PC 9801). The slow deviation with a period of about 50 sec or with 0.02 Hz, of body sway in the RL or AP direction was not infrequently observed when the eyes were open. However, it was eliminated or negligible when the eyes closed. When such a slow deviation of body sway appeared, larger values of standard deviation and maximal range of body sway occurred in spite of the short length of the trace of the center of gravity.The incidence of slow deviation of body sway decreased in the RL direction and increased in the AP direction with the age of the test subjects. The origin of such a slow deviation is considered to be a redundancy of human standing ability, because it appeared only in stable and safe standing in normal subjects with eyes open.
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