According to Bloomberg researchers at the Johns Hopkins Bloomberg School of Public Health (NSH), South American tribes with little influence on the Western diet did not show a mean blood pressure increase from 60 to 60 years old. By comparison, nearby species with food, including nearby food and salt, showed higher blood pressure in the late middle of the year.
In most countries, including the United States, blood pressure rises with age. The results of this study support the notion that rising blood pressure with age in Westernized societies is not a natural part of aging but may result from the cumulative effect of exposure to Western diet and lifestyle.
The findings were published in the November 14 issue of the journal. JAMA CARDIOLOGY.
"Though the idea that hypertension is the result of aging is a well-known belief in cardiology, our findings add evidence that increased blood pressure may be an inevitable consequence of Western consciousness therapy and lifestyle, not aging itself" Noel Mueller Ph.D., assistant professor of epidemiology at the MPH Bloomberg School and a member of the Wellch Center for Prevention, Epidemiology and Clinical Research for preventive, epidemiological and clinical research.
For their study, the researchers obtained blood pressure readings from Yanomami aged 72 to 60 and found that the trends were not higher or lower as participants aged. The researchers measured blood pressure in 83 near-sighted and tribal people who were more exposed to Western influences, including food, and found that blood pressure tended to increase with age.
Yanomami lives as a hunter and gardener in tropical rainforests in northern Brazil and southern Venezuela. Their diet is low in fat and salt, and has a lot of fruit and fiber. Studies on Adult Yanomami have shown that atherosclerosis and obesity have been virtually unknown since the 1980s, and mean blood pressure was lower, although not significantly older.
This new study suggests that the age stability of the Yanomami blood pressure starts from childhood. It is the first time Yanomami is compared to a population at a geographically equal location (Yekwana) that has a different impact on the Western diet and other Western lifestyles.
Surveyors in the village of Yanomami, southern Venezuela, found that systolic blood pressure measurements were an average of 95 (mmHg) systolic blood pressure readings. (The American systolic mean is 122 and the diastolic blood pressure is 71.) This low level of Yanomami is consistent with previous studies by Yanomami adults, but the Yanomami children also measured approximately the same blood pressure. In fact, according to this data, the blood pressure of this population is approaching the level of at least 1 from the age of at least 60, and there is no tendency to increase or decrease.
Unlike Yanomami, Yekoman was exposed to some aspects of the Western lifestyle and diet through interaction and trade with the industrialized world. The blood pressure at the youngest age was almost the same as the blood pressure of my colleagues, but it tended to be statistically clear (about 0.25 mm Hg / yr) as the age was estimated – yes and my mean blood pressure was 5.8 mm Hg at 10 And 15.9 mm Hg is over 50 years old.
"The rise in blood pressure in this age range starts in childhood, suggesting that childhood can be a 'window of opportunity' of lifestyle intervention to prevent later increases in blood pressure," says Mueller. .
In this context, the maximum systolic blood pressure in the United States increases by 1.5 mmHg and 1.9 mmHg per year for men and women, and 0.6 mmHg per year for adults.
Mueller and his colleagues plan to study intestinal bacteria from Yanomami and Yekwana to determine whether intestinal microbes explain the difference in blood pressure between the two tribes.
Funding was provided by the National Heart, Lung and Blood Institute (K01HL141589), the Alfred P. Sloan Foundation, the C & D Fund and the Emch Fund for Microbial Diversity.