. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. Studies of Human Organ System Function 87 index by 0 • 8 per cent per year, and to a slight reduction in calculated surface area. The regression of cardiac index on age is due partly to an average decrease in heart rate averaging 0 • 3 per cent per year, while the remainder, or 0 • 5 per cent per year, represents a reduction in stroke index, the blood pumped per beat per unit of body size (Fig. 7).. 50 60 Age years Fig. 7. The relation between cardiac stroke index and age for 67 "normal" men.
. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. Studies of Human Organ System Function 87 index by 0 • 8 per cent per year, and to a slight reduction in calculated surface area. The regression of cardiac index on age is due partly to an average decrease in heart rate averaging 0 • 3 per cent per year, while the remainder, or 0 • 5 per cent per year, represents a reduction in stroke index, the blood pumped per beat per unit of body size (Fig. 7).. 50 60 Age years Fig. 7. The relation between cardiac stroke index and age for 67 "normal" men. Blood pressure was measured in these subjects by brachial intra-arterial needle and the mean blood pressure was found to increase by only 0-1 per cent per year. Therefore, the decrease in cardiac output was in association with an increase in pressure flow ratio, the vascular resistance, which averaged 1-1 ±0-14 per cent per year. The change in output and resistance are greater than the rates calculated (Landowne,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ciba Foundation; Wolstenholme, G. E. W. (Gordon Ethelbert Ward). Boston, Little, Brown
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