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Reflex control of heart rate in normal subjects in relation to age: a data base for cardiac vagal neuropathy.
Diabetologia 1982 March
We examined the heart rate changes induced by forced breathing and by standing up in 133 healthy subjects in the age range 10-65 years in order to establish a data base for studies on parasympathetic heart rate control in autonomic neuropathy. Test results declined with age. Log-transformation was used to define the lower limit of normal (P0.10) and an uncertainty range (values between P0.10 and P0.025). The lower limit of normal decreased from 22 to 11 beats/min for forced breathing and from 26 to 16 beats/min for standing up, with age increasing from 10 to 65 years. No subject scored below and only two subjects scored in or below the uncertainty range for both tests. Lack of correlation between both tests (r = 0.17) documents the different afferent mechanisms of the reflex heart rate changes. In combination these two tests form a simple and reliable bedside method to establish cardiac vagal neuropathy.
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