Hypertension is a multifactorial cause with many differences and one of the leading causes of death in the world. The incidence of hypertension is very high with a prevalence reaching 60% to 80% of the elderly population. Body mass index (BMI) is highly influential in hypertension where overweight can estimate the risk of hypertension compared to normal BMI. BMI that is often afflicted by hypertensionis was obesity. Obesity provides the impetus to activate the simple nervous system for changes in the structure and function of the kidneys. Arterial pressure control of diuresis and natriuresis causes blood pressure to become hypertensive. The purpose of this research was to find out whether there is a relationship between BMI and hypertension in the elderly in Simpang Tiga Health Center Pekanbaru City. This research was an analytic observational research with cross sectional approach and accidental sampling technique. The total sample of 61 people included in the inclusion criteria of total participation. This research was conducted on January 21-23, 2020 in the Elderly Poly in Simpang Tiga Health Center Pekanbaru City. The results of this study were p-value <0.01 (p-value <0.05) and correlation coefficient (rs) of 0.424 which means there was a relationship between BMI and hypertension in the elderly in positive direction and moderate strength relationship. The conclusion of this study was that BMI has a significant relationship with hypertension in elderly in Simpang Tiga Health Center Pekanbaru City.
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