一般都认为老年男性血浆T呈进行性下降,但对此观点曾有过争论。有些作者指出:身体完全健康的正常老年人是不会出现血浆T值下降的。在很多研究中,老年对象的选择的确有问题,我们认为有必要通过研究一组非常健康的人来重新阐述这个问题,目的是判断血浆T和游离T(AFTC)是否随着年龄增长而下降。另外,年轻人和老年人的T水平的昼夜波动幅度是否有所区别,抽烟、运动、饮食这些外部因素是否对T值有影响,相同的外界应激对T值的影响是否因年龄不同而有所不同等等。 It is generally accepted that plasma T is progressively decreased in elderly men, but there has been controversy over this view. Some authors point out that there is no decrease in plasma T values ​​in normal, healthy, elderly individuals. In many studies, there is indeed a problem with the choice of elderly subjects, and we consider it necessary to revisit this issue by studying a group of very healthy individuals in order to determine if plasma T and free T (AFTC) decline with age. In addition, whether the external and internal factors such as smoking, exercise and diet have an influence on the T value are the same whether the influence of the same external stress on the T value is due to different ages or not Different and so on.