Vargas E, Lye M
Exp Gerontol. 1982;17(6):445-51. doi: 10.1016/s0531-5565(82)80006-5.
The cardiovascular responses to 70 degrees head-up tilt were compared in 9 healthy young, mean age 31 +/- (S.D.) 3.2 years, and 8 healthy elderly subjects, mean age 71 +/- 5.1 years. After 10 minutes tilt, qualitatively similar responses were found in the two groups. Quantitatively, however, heart rate, stroke volume, cardiac output, and peripheral resistance showed smaller differences between the supine and tilt positions in the older group. Blood pressure and plasma volume changes were similar in both groups. There is an age-associated effect in the cardiovascular response to change in posture in healthy people that resembles that found in congestive cardiac failure.
对9名健康年轻人（平均年龄31±3.2岁）和8名健康老年人（平均年龄71±5.1岁）进行了比较，观察他们对70度头高位倾斜的心血管反应。倾斜10分钟后，两组的反应在性质上相似。然而，从数量上看，老年组仰卧位和倾斜位之间的心率、每搏输出量、心输出量和外周阻力差异较小。两组的血压和血浆容量变化相似。在健康人群中，心血管对姿势变化的反应存在与年龄相关的效应，这与充血性心力衰竭患者中发现的情况相似。
