50岁以上正常人的F—V曲线形状和切线时间常数特性及其形？…

为了解５０岁以上正常人Ｆ－Ｖ曲线形状及其切线时间常数的特性，在１３５例５０－８４岁正常人Ｆ－Ｖ曲线上测量了高中低肺容积的切线时间常数。结果：在４大类型Ｆ－Ｖ曲线形状中，凸型分布最高，达４０％－７５％，其１特性为τ１７５〉τ１５０〈τ１２５，│τ１７５│〈１ｓ凹型分布最低，为０－１８％。

Characteristics of F-V curve configuration and its tangent time constants and its wave-speed mechanism in normal humans above 50 years old]

To understand the characteristics of F-V curve configuration and its tangent time constant (tau 1) in normal humans above 50 years old, the tau 1 at high, mid, low lung volumes (tau 175, tau 150, tau 125) were measured from F-V curves for 135 normal humans aged 50-84. The results showed that the convex type was the most frequent one (40%-75%) among the 4 types of F-V curve and its tau 1 characteristics were tau 175 > tau 150 < tau 125 and magnitude of tau 175 < 1s; on the other hand, the concave type was the least frequent one (0.18%). These suggested that the convex type and its tau 1 characteristics might be the changes in senility. Further, the mechanical mechanism for the convex type of F-V curve configuration was explored.