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POSTURAL ACTIVITY:ESPECIALLY AWAKING FROM REM SLEEP Michiya Sugawara 1 1Kanagawa Prefectural Mental Hospital Kinkoin pp.519-526
Published Date 1984/6/1
DOI https://doi.org/10.11477/mf.1406205324
  • Abstract
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The author previously examined functions of equilibrium of subjects using the statograph which records a movement of the center of gravity in a two dimentional 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 proces-sor connected to the statograph, showed that the high frequency components of the trajectory also increased. The author had often observed that some subjects exhibited rythmic body sway im-mediately after awakened from stage-REM. The present report focuses the description of the rhyth-mic 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 plat-form of the statograph for 60 seconds, with their eyes closing and their soles of feets opening at the angle of 30 degrees. Then, their body sway were recorded. Anterior-posterior and lateral components of their trajectories were simulta-neously examined by analyzing the trajectory by means of Fast Fourier Transformation method equiped 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±212mm (mean±SD). Power spectrum of the frequency of the trajectory was obtained with respect to the resolution of 0.0195Hz. The mean distribution of power spectra of nine subjects, who were awakened from all the stages, decreased exponent-ially and reached near zero within 2Hz. Six cases among the nine exhibited the increase of fast-wave components in both anterior-posterior and lateralcomponents when awakened from stage-REM. The fast-components in the lateral components were significantly large and the rhythmic oscil-lation of the body sway lasted for about eight seconds after the start of record.

Since the activity of alpha and gamma motor systems are generally known to be lowered in a preparation state toward complete awakening im-mediately after the forced waking, the increase of the fast-wave components observed in both antero-posterior and lateral components may beconsidered to be attributed to this lowed level of the system. Man is controlled by the higher mechanisms, the activity of which depends on the degree of awakening. It may concluded that the appearance of the rhythmic body sway with in-creasing fast-wave components in anterior-poste-rior and lateral components is caused by the motor activity probably oscillating on the alpha-gamma loop.


Copyright © 1984, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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