Relationship between Body Mass Index and Cardiovascular Fitness Levels of Junior High School Students

Abstract

This study aims to determine whether there is a relationship between Body Mass Index (BMI) and cardiovascular fitness levels among students at SMP IT Darul Wahdah Gerung in 2025. This study used a quantitative method with a correlational design. Data collection techniques were carried out by measuring body weight and height to determine BMI values, as well as the 12-minute Cooper test to measure students' cardiovascular fitness levels. Data analysis used Pearson's correlation test. The results showed that: 1) There was a significant relationship between Body Mass Index (BMI) and the cardiovascular fitness level of students, as evidenced by a correlation coefficient of -0.689 and a significance value of 0.005 (p < 0.05), so H₀ was rejected and H₁ was accepted. 2) The negative correlation coefficient value indicates a significant negative relationship, which means that the higher the students' BMI, the lower their cardiovascular fitness level, and vice versa.