[Postural activity--especially awaking from REM sleep].
The author previously examined functions of equilibrium of subjects using the statograph which records a movement of the center of gravity in a two dimensional trajectory. Results indicated that area enveloped by the trajectory and the total length of trajectory increased when subjects were awakened from NREM sleep. The analysis of frequency of the trajectory describing the body sway, which was performed using a signal processor connected to the statograph, showed that the high frequency components of the trajectory also increased. The author had often observed that some subjects exhibited rhythmic body sway immediately after awakened from stage-REM. The present report focuses the description of the rhythmic phenomena. The subjects were nine healthy male volunteers with a mean age of 20 years. They were awakened by a buzzer at stages of rest, stage-4, stage-REM and stage-2, and were made to stand on the platform of the statograph for 60 seconds, with their eyes closing and their soles of feet opening at the angle of 30 degrees. Then, their body sway were recorded. Anterior-posterior and lateral components of their trajectories were simultaneously examined by analyzing the trajectory by means of Fast Fourier Transformation method equipped in the signal processor. The total length of the trajectory of body sway in nine cases awakened from respective stages were: rest (control), 690 +/- 133; stage-4, 1311 +/- 220; stage-REM, 911 +/- 188; and stage-2, 863 +/- 212 mm (mean +/- SD). Power spectrum of the frequency of the trajectory was obtained with respect to the resolution of 0.0195 Hz.(ABSTRACT TRUNCATED AT 250 WORDS)
D000328:Adult; D006801:Humans; D008297:Male; D009046:Motor Neurons / Q000502:physiology; D004856:Postural Balance; D011187:Posture; D012895:Sleep, REM / Q000502:physiology*