健常者の静止立位姿勢における足圧中心動揺変数の性差と年代差，及び変数間の関係

抄録

Since the ancient times, the center of pressure (COP) sway during the static standing posture has been used in clinical examinations of dizziness and dysequilibrium. To derive a standard value for clinical examination, we need to completely understand the COP sway of healthy people. However, only a few detailed studies based on a large sample have been conducted to date. This study aimed to examine sex and age-level differences in COP sway in the static standing posture and the relationships among COP sway variables in healthy people. Subjects included 2,412 males and females, with ages ranging from 3-90 years. We measured their COP sway with a Romberg posture for 60 sec. For the COP sway variables, we selected length per unit time, environmental area, rectangle area, and standard deviations of X and Y directions. In comparison with the results of Imaoka et al.10), results of the current study showed that the mean value of length per unit time and rectangle area were low in all age-level groups in both sexes, thus indicating varying age-level differences in both sexes. Furthermore, two-way ANOVA (sex × age) results showed significant interactions among all variables. In multiple comparison tests, the variables that showed sex difference varied by age level, and those that showed age-level difference varied in both sexes. In terms of age, the mean values of the COP variables, completely showed the following tendency: high in children aged ≤ 9 years, low in the 20 age group, and increasing from the beginning of the 50s. The values were generally higher in males. The relationships among COP variables in sexes and in group-pooled sexes showed few differences. Furthermore, the relationship between both area variables was very strong. In conclusion, excluding length per unit time and rectangle area, data on the COP sway of modern people show little difference from the findings published 20 years ago (Imaoka et al.10)). The mean value of each COP variable is higher in males and does not change linearly with age （i.e., the mean value for the 20 age group is low）. There are also significant relationships among the variables of length per unit time, area, and standard deviation.