Ambrosia Aventi Pidor Pengarang STEFANUS PIETER MANONGGA Dosen Pembimbing 1 Stefanus Pieter Manongga Ketua Penguji Intje Picauly Penguji 2 GROUSE T. S OEMATAN Penguji 1

Blood pressure is an important factor in the circulatory system in the human body, there are two changes in blood pressure, namely high blood pressure and low blood pressure. Based on data from the Kupang City Health Office 2018, the prevalence of hypertension in Oebobo sub-district is 10.1%, the estimated number of hypertension aged 15 years in Oebobo sub-district is 19,474. Meanwhile, the prevalence of hypotension in general is estimated at 5% to 34% and has a tendency to increase at the age of 17-19 years. This study aims to determine the factors that influence blood pressure in high school students in Oebobo District, Kupang City. This study uses an observational analytic study with a cross sectional study. The target population in this study was taken using a proportional sampling technique, namely that there were five selected high schools. The sample in this study were 140 students. The data analysis used was bivariate analysis and multivariate analysis with logistic regression method. The results of this study stated that the variable nutritional status (ρ = 0.001), healthy living behavior (ρ = 0.000) had an effect on blood pressure in high school students. While the factors that have no influence are predisposing factors, namely gender (ρ = 0.207), and the age of the respondent (ρ = 0.794); and food consumption variable (ρ= 0.299). The results of multivariate analysis showed that nutritional status (OR = 3.8, = 0.011), and healthy living behavior (OR = 8.1, = 0.000) were the most influential factors on blood pressure in high school students in Oebobo District, with the ability to explain blood pressure by 33%. Normal nutritional status, as well as good healthy lifestyle behaviors such as not smoking, not consuming alcohol, adequate rest/sleep habits and adequate physical activity can maintain normal blood pressure status. Keywords : Blood pressure, Healthy Lifestyle, Nutritional Status