ヒト直立時重心動揺の周波数分析 (4) : 正常者における加齢変化及び性差
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概要
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The frequency of movement of the center of gravity below 2Hz during Rombergs test was investigated in 202 normal subjects since it had been detected by our previous study that the sum of amplitudes of frequencies below 2Hz is about 80% of the total amplitude below 10Hz. The influence of sight (eyes open or closed) and of age and sex differences on body sway were studied statistically. The frequency of body sway in both lateral (X) and anterior-posterior (Y) directions was analyzed by the FFT method, and the sum of amplitudes at each frequency band of 0.1Hz below 1Hz and at each one of 0.2Hz between 1 and 2Hz was calculated. The mean values of the sum of amplitudes at each frequency band were compared.<BR>Increased body sway at frequencies of 0.1170 to 2.0085Hz and decreased body sway at frequencies of 0.0195 to 0.095Hz occurred when the subject closed his eyes.<BR>Sex differences were noted in X with eyes open in those aged 20-29 years, in X with eyes open or closed and in Y with eyes closed in those aged 30-39, in both X and Y with eyes open or closed in those aged 40-49, in X with eyes closed and in Y with eyes open or closed in those aged 50-59 and in both X and Y with eyes open or closed in those aged 60-69. Larger body sway with lower frequencies (less than 0.3Hz) and smaller sway with higher frequencies (0.3-2.0Hz) were observed in females than in males.<BR>Aging affected body sway in both sexes with eyes open or closed, especially in males in the 6th decade and females in the 5th decade.
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