Why the study?
Does the baroreceptor-heart rate reflex indicate the capacity of arterial baroreceptors to control blood pressure?
Does the baroreceptor-heart rate reflex indicate the capacity of arterial baroreceptors to control blood pressure?
The baroreceptor-heart rate reflex is a poor indicator of the capacity of arterial baroreceptors to control blood pressure, particularly during exercise or in hypertension.
Answers are grounded in this paper and cite their sources.
HR baroreflex sensitivity poorly indicates arterial BP control; leaves open its validity in hypertension and exercise.
We have examined the question asked in the title by studying: the carotid baroreceptor reflex in man with a variable-pressure neck chamber; the carotid baroreceptor reflex in conscious rabbits with a variable-pressure capsule around the carotid bifurcation; and the barorecptor-heart rate reflex. 2. At rest, the association between the sensitivities of the carotid baroreceptor-blood pressure and -heart rate reflexes, and of these with the baroreceptor-heart rate reflex, is weak. Exercise causes dissociation between control of blood pressure and heart rate. In hypertension, depression of the baroreceptor-heart rate reflex does not reflect the altered characterisitics of the carotid sinus-blood pressure reflex.
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Ludbrook et al. (1980) studied this question.
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