We studied posturography in the goiometry test (gravigoniometry test : G.G.T.) as well as in the static standing position. Slow angular velocity of 0.1°/sec-0.25°/sec was used in this gravigoniometric test. The examinations administered to subjects were declining-inclining-toward in four directions, (1) Forward down 10°- then reverse to 0°, (2) backward down 10°- then reverse to 0°, (3) to the left down 10°- then reverse to 0°, (4) to the right down 10°- then reverse to 0°, and each stage with eyes open and eyes closed was monitored.
It was evident that in the forward-down direction, the patterns accompanied by degree of inclined plane included the three groups.
These patterns were little influenced by the degree of angular velocity which was used. This was considered to provide information on the equilibrium control system, such as corresponded to the stimuli. When we compared the frequency anaylysis of body swaying to angular velocity change, the condition of the control system gradually changed with time.
Frequency analysis of Y-axis component in these experiments revealed the sway of 0.8Hz to 0.9Hz on the base line.
This phenomena corresponds to the frequency of walking movements in humans. Similar results were also observed in the sitting up position.