It is well known that the momentary sways of the human body in standing position as shown in cephalogram has never been studied.
The purpose of this study is to examine exactly the human equilbrium in standing position by means of recording acceleration registogram (ARG).
The subjects testd are 20 normal adults.
The accelerometer (120A-ID) is fixed on the top of the helmet as the effective plane of the accelerometer is just right angle with the frontooccipital axis of the head.
Each subject wearing the helmet stands on normal position and Mann's position for 40 seconds. Also he stands on the plank of the electric goniometer (Honjo) till he falls down from the plank.
The body movement of the subjects during the test is recorded by means of acceleration registrogram (ARG).
The waves of ARG in normal standing position are composed of waves of short amplitude (less than 0.1g) either the subject closes his eyes or not.
The waves of ARG in Mann's position are mainly composed of waves of short amplitude either the subject closes his eyes or not. Occasiong) are recognized, but they are not observed continuously.
When the subject stands on the plank of the goniometer the waves of ARG (Gonio-ARG) are mainly composed of waves of short amplitude, while a few waves having medium amplitude are recognized, but they are not observed continuosly.
The waves of ARG in normal position and Mann's position have comparatively larger amplitude at the first one-fourth period than at the next three fourth. However, the waves of Gonio-ARG have larger amplitudes at the last half period when he closes his eyes.
The influence of vision upon the waves of ARG in normal position is hardly proved, and great influence of vision upon the waves of ARG is clarified when he stands in Mann's position or on the plank of the goniometer.
The whip-foot does not influence on the patterns of ARG in standing position.
The waves of ARG has several patterns, e.g., the pattern deviating to the left, to the right or the pattern withont deviation.
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