直立時重心動揺の振幅と速度の研究 : 年齢変化と診断的意義

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概要

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• The aim of this study is to investigate characters of body sway in normal subjects of different ages and in ataxic patients, who were standing for one minute in Rombergs posture. Both mean values and standard deviations of each amplitude and each velocity of movement of the center of gravity (CG movement) were calculated by using a signal processor (7T08-Sanei). The frequency distributions were also displayed by the same way in each test subject.Frequency distribution curves of the amplitude or the velocity of CG movemcnt were usuallyclose to the normal distribution. Peak values of the frequency distributions were usually highand their standard deviations were small in normal subjects, whose standing posture lookedstable. However, peak values were low and their standard deviations were large in normalolder subjects or in ataxic patients, whose standing showed more unstable. That is the reasonwhy the standard deviations of both the amplitude and the velocity of CG movement are important variants to evaluate standing ability in test subjects.Eighty eight normal subjects (60 males and 28 females, 20 to 73 years old) and twenty three abnormal ataxic patients were examined in this study. The pathological cases were classified into three groups, such as the group of the peripheral vestibuar disease in the acute stage, the group of Menieres disease in the chronic stage and the group of the central nervous system disturbance.The standard deviations of the velocity of CG movement in the anteroposterior direction were smaller in the younger normal subjects than in the elder ones. Therefore, this variant may be considered to be one of those which are influenced by aging.A discreminant analysis was carried out to differenciate the above mentioned three groups and the normal group. The group of the peripheral vestibular disease in the acute stage was discreminated from the normal except two cases (P<0.05). The group of the central nervous system disturbance was satisfactory discreminated from the other three groups (P<0.01). However, it was failed to discreminate the group of Menieres disease in the chronic stage from the normal.

• 社団法人 日本耳鼻咽喉科学会の論文

著者

• 池上 彰博

  北里大学医学部

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