Study the Effects of Age, Gender, and Body Mass Index on Heart Rate

Heart disease is one of the deadliest diseases in the world in 2019; the increase in deaths has reached 2 million to 8.9 million people since 2000. Heart rate (HR) is an essential medical helpful sign for quickly evaluating health and knowing a person's fitness. Besides cardio exercises, some non-physical activities influence HR, such as age, gender, and body mass index (BMI). This study aims to analyze the RR intervals in leads I, II, III, aVR, aVL, and aVF and determine the effect of age, gender, and BMI on HR. HR measurements were carried out using a portable ECG, the KardiaMobile 6L, during 30 seconds of recording on the subject in resting conditions and normal sinus rhythm. The number of subjects in this study was 168 people in 5 age groups, namely A (4-5 years), B (6-7 years), C (10-13 years), D (19-30 years) and E ( 55-75 years). Each age group consisted of female and male subjects, but complete BMI category variations were only found in group D. Based on the results of the HR analysis based on age, it can be concluded that with age, HR will decrease. This decrease is estimated at 4.19 bpm/year in the age range of children to adolescents (4.0 to 11.5 years) and 0.16 bpm/year in the age range of adolescents to the elderly (11.5 to 75 years). Based on gender in all age groups, it can be concluded that the average HR of women is not always higher than that of men. In group D (19-30 years), BMI in resting subjects did not affect HR. RR interval values in lead I (0.6997 +/- 0.056), lead II (0.6998 +/- 0.056), lead III (0.6998 +/- 0.056), aVR (0.6998 +/- 0.056), aVL (0.6995 +/- 0.057 ) and aVF (0.6998 +/- 0.056) indicate that the RR interval values for each lead are identical.