Frequency domain analysis of heart rate variability in young obese adults with parental history of hypertension during isotonic exercise: A comparative study

Abstract

Background: Heart rate variability (HRV) is the beat-to-beat variation in time of consecutive heartbeats. It is one of the indicators of autonomic nervous system (ANS) function. The ANS control of the cardiovascular system in obesity and hypertension remains controversial. Aims and Objectives: The objectives of the study were to analyze the effects of isotonic exercise on frequency domain indicators of HRV in young obese adults with parental history of hypertension and compare the same with that of normal controls along with an assessment of their recovery. Materials and Methods: Normotensive subjects in the age group of 18-22 years were selected and classified into two groups, based on body mass index and parental history of hypertension. Electrocardiogram was recorded before exercise, immediately after exercise and during recovery using powerlab. Result: Statistically significant variations were observed when values of low frequency (LF), high frequency (HF), and LF/HF ratio were compared in all the three conditions. Obese students with positive history of parental hypertension reflected a sympathovagal imbalance that exaggerated during exercise with delayed recovery. Conclusion: This study reveals the importance of vagal inhibition during exercise. It has also enabled us to detect cardiovascular autonomic imbalance that is exaggerated during exercises in young obese subjects who are genetically susceptible and more prone to develop hypertension later in life.

Relation of Body mass index to Heart rate variability in female medical students

“…The high body fat with low sympathetic activity in young healthy adult signi ies that body fat percentage also in luence cardiac sympathovagal balance in healthy adults (Krishna and Navekar, 2013;Wu et al, 2008). Studies have shown that susceptible individuals who have obesity and parental hypertension show a strong sympathetic overactivity due to decrease parasympathetic control, which may cause cardiovascular, risks in future (Sreenivas et al, 2018). Study has also revealed that in overweight subjects there was no difference in LF, but they had reduced HF, increased LF/HF compared to normal weight subjects (Krishna and Navekar, 2013) Imbalance of the autonomic nervous system for a prolonged duration of time is anExtensive and in luential risk factor for adverse cardiovascular events, including mortality (Curtis and Keefe, 2002).…”

“…LF and HF can be also measured in normalized units (nu) to emphasize the controlled and balanced behaviour of the two branches of the autonomic nervous system (Brar et al, 2015). Studies were reported that BMI and HRV has a very strong correlation in high blood pressure and obese young individuals (Sreenivas et al, 2018). The present study was carried out to assess the relationship between body mass index and changes of the autonomic system in heart rate variability among young female medical students.…”