Gorban Features of autonomic regulation of heart rate depending on the composition of the body in young people

Abstract

Objective: of the research was to study preclinical changes in heart rate variability (HRV) associated with overweight and obesity in young people in order to determine the targets of predictive therapy.Material and methods: the study involved 105 young men and 111 young women aged 18 to 30 years. Questionnaires, anthropometry with determination of body mass index and waist circumference, bioimpedansometry with determination of body fat (BF) and visceral fat (VF) level, as well as monitoring of HRV based on short (ten-minute) records were carried out.Result: young people of both sexes showed a high frequency of overweight (24.1%) and obesity (18.5%), as well as a low level of physical activity (FA, 46.3%). In 28.8% of young men and 12.5% of young women with overweight and obesity, there was a high level of VF. Taking into account the outstripping increase in VF as compared to BF, it is reasonable to divide the VF levels into low (<5 conventional units), intermediate (5-9 conventional units), and high (> 9 conventional units). In overweight young people, compared with normal body weight, HRV is characterized by less pronounced parasympathetic activity, and in girls compared with young men, there is less total HRV. A high HRV level is associated with such HRV indicators as an increase values of LF/ HF and SDANN, reflecting, respectively, a reduction in the parasympathetic and enhanced sympathetic activity of the autonomic nervous system with a predominance of the central circuit of heart rhythm regulation over the autonomous one.Conclusion: to diagnose autonomic imbalance in young people, it is necessary to determine the composition of the body, FA level, take into account the individual dynamics of HRV parameters, since they rarely exceed the norm. Changes in total HRV, sympathetic and parasympathetic activity during the non-drug correction of obesity should be monitored with an emphasis on pNN (50) and SDANN indicators associated with BF, and when correcting physical activity — on the indicator of voltage index of regulatory systems.