[Autonomic neuropathy in diabetes mellitus and advanced age].

The reactions of cardiac frequencies of 10 diabetic persons, seven of them dependent on insulin, aged 45.5 +/- 11.8 years, having had diabetes for 12.

[Changes in autonomic cardiovascular control in biological aging--studies using orthostatic provocation and analysis of heart rate profiles in long-term ECG].

We compared the reactions of heart rate in long-term ECG as well as the heart rates and the blood pressures in orthostatic provocation tests using pharmacological blockades in 14 young human subjects aged 19 to 33 years (mean age = 22 +/- 2.2 years) with those of 16 healthy subjects between 67 and 89 years (m = 74 +/- 9.4 years).

[Heart rate and contractile reserve of the aging heart].

In standardized experiments on both conscious and anaesthetized young (n = 11) and old (n = 7) dogs differences in haemodynamics, contractility and myocardial oxygen consumption correlated to age were evaluated. Under resting conditions no significant differences were observed. Following stimulation with catecholamines young (n = 6), and old (n = 6) dogs displayed an almost parallel increase in (dp/dt) max.