Dynamic postural control : Repetitive alternative rotation of the head and thorax

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  • ダイナミック姿勢制御 : 頭部/頭部胸郭同期反復交互回転

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Accidental falls may cause serious outcomes for the aged. Motor and sensory systems decay with aging, so reaction time as a placing reflex becomes delay to abrupt changes of the posture. Dynamic postural balance may provide more information than static postural balance. Dynamic postural balance was studied for proprioception of the neck and trunk, and for eyes control. Seven healthy volunteers participated in this study after informed consent. Repetitive alternative rotation of the head (M1) and of the head and thorax synchronized (M2); gazing at a projected point from a laser pointer set on the head, gazing at a fixation point on a screen and closed eyes; comfortable pace (P1) for repetitive alternative rotation, a faster pace than P1, and a slower pace than P1 were asked to do for 20 sec in every combination. A force plate was used for the center of foot pressure, and a wireless 3 axes accelero-meter were set on the top of the head for head motion. Powers were discussed at the same frequency as the head and/or thorax movements. Powers in M2 were significantly higher than those in M1. Neck proprioception should be important than that of thorax for dynamic postural balance.

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