CHANGES WITH AGE IN THE BLOOD PRESSURES IN ADULT MEN

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Abstract
The blood pressures have been measured, under basal conditions, in 100 normal men, 20 in each decade, from 40-89 yrs., in 2 men of 91 and 1 man of 101 yrs. The data were statistically analyzed and the various measures and graphs of correlation and variation presented. The systolic, mean, and pulse pressures showed a highly significant positive relation to age. The avg. values for the systolic, mean, and pulse pressures of the men, grouped in succeeding half or whole decades, indicated that the relation of these pressures to age changes and is therefore curvilinear, rather than uniform and linear. Three curves of the systolic pressure (a) the straight line, Y = a + bX, (b) the S-curve of the 5 yr. avgs., smoothed mathematically, (d) the hyperbolic curve, [image] were analyzed; all presented highly significant relationships. The smoothed curve was the best fit. The systolic, mean, and pulse pressures increased gradually from 40 to 62 yrs. and rapidly from 62 to 85 yrs. After 90 yrs., the pressures tend to decline; but the no. of observations is too few to render a valuable inference. The mode of the systolic, of the mean, and of the pulse pressures of men, arranged by decades, increased with age. The mode was sharply concentrated in the younger men.

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