Key result
Spontaneously hypertensive rats exhibited higher MAP variability and reduced HR variability compared to Wistar-Kyoto rats, with an increased dependence on the sympathetic nervous system with age.
Spontaneously hypertensive rats exhibit increased MAP variability likely due to structural vascular changes and reduced HR variability due to reduced tonic vagal discharge, with an increasing dependence on the sympathetic nervous system as they age.
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Should not yet alter hypertension management; leaves open whether autonomic variability patterns translate to human outcomes.
Friberg et al. (1989) studied Hypertension. beta 1-adrenoceptor and cholinergic blockade vs. Wistar-Kyoto rats (WKY) was evaluated on Mean arterial pressure (MAP) and heart rate (HR) variability. Spontaneously hypertensive rats exhibited higher MAP variability and reduced HR variability compared to Wistar-Kyoto rats, with an increased dependence on the sympathetic nervous system with age.
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