Why the study?
Do obese Zucker rats have impaired chronotropic baroreflexes compared to lean Zucker and Sprague-Dawley rats?
Do obese Zucker rats have impaired chronotropic baroreflexes compared to lean Zucker and Sprague-Dawley rats?
Obese Zucker rats exhibit blunted baroreflexes before the onset of hypertension, suggesting a potential contributing mechanism to future blood pressure elevation.
Answers are grounded in this paper and cite their sources.
Hypothesis-generating in obese rat models; leaves open any role in human hypertension onset or management.
We compared reflex chronotropic responses to intravenously-infused drugs in 3 groups of age-matched female rats, namely: Sprague-Dawley, lean Zucker, and obese Zucker. Initial baselines for mean arterial pressure and heart rate did not differ between rat groups. However, baroreflex sensitivity was evidently attenuated in obese Zucker rats because their heart rate responses to infused phenylephrine or sodium nitroprusside were consistently weaker than those of other rats. Should these rats eventually become hypertensive, their blunted baroreflexes could contribute importantly to initiate the blood pressure elevation.
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Buñag et al. (1988) studied this question.
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