Hormonal
In Pima Indians, increased adiposity and hyperinsulinemia do not trigger the sympathetic nervous system (SNS) activation typically seen in whites, which contributes to a lower prevalence of hypertension despite high obesity rates.
This research suggests that the link between obesity and high blood pressure is not universal. For some populations (like Pima Indians), high body fat and insulin levels do not trigger the stress response (SNS) that usually raises blood pressure. This highlights that genetic background plays a critical role in how the body handles weight and stress.
The lack of an increase in MSNA with increasing adiposity and insulinemia in Pima Indians may contribute to the low prevalence of hypertension in this population.
Why this rating
Large sample size (n=119), direct measurement of MSNA via microneurography, controlled for body fat.
Source
Ethnic Differences in Insulinemia and Sympathetic Tone as Links Between Obesity and Blood Pressure
Christian Weyer et al. · Hypertension · 2000
DOI 10.1161/01.hyp.36.4.531
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