Simulation of endothelium-dependent vasodilation in young male persons based on the parameters of body weight components

Abstract

The aim of the work. To analyze the results of endothelium-dependent vasodilation of the brachial artery in persons with different content of body weight components and to develop models for predicting the response of endothelium-dependent vasodilation based on the parameters of body weight components. Materials and methods. In total, 31 young men were examined and divided into three groups depending on the total body fat value: 16 people (51.6 %) – group I, 11 people (35.5 %) – group II and 4 people (12.9 %) – group III. Determination of such parameters as body mass index (BMI, kg/m2), the percentage of total fat (TFP, %), the visceral fat content (VFC, units) and the content of free-fat mass (FFM,%) was performed using a bioimpedance analyzer TANITA BC-601. Endothelial regulation was assessed on the basis of vasomotor dilation of the brachial artery activity before and after the occlusion test using a four-channel rheograph ReoCom (XAI-MEDICA). Results. During the occlusion test, three types of endothelium-dependent vasodilation (EDVD) were identified in individuals exa­mined. 62.50 % of men in group I had a normoergic reaction of the brachial artery, 31.25 % had a hyperergic and 6.25 % had a hypoergic reaction. Among group II persons, a normoergic type of post-occlusive reaction was in 45.4 %, hyperergic – in 36.4 %, and hypoergic type – in 18.2 %. Regarding group III, 75 % of individuals had the hyperergic type of endothelium-dependent vasodilation, 25 % had the normoergic type, and no hypoergic type of reaction was observed at all. To determine the endothelial vasoregulatory function on the basis of correlation-regression analysis, models were constructed with coefficients of determination R2 of 0.277 (BMI), 0.126 (TFP), 0.189 (VFC) and 0.146 (FFM). The models themselves had the following form: between EDVD and BMI – y = -4.5297 + 0.865x; TFP – y = 10.7389 + 0.4x; VFC – y =13.8119 + 1.0041x; FFM – y = 52.7904 – 0.4464x. In addition, statistically significant correlations were found between them – from r = +0.335 to r = +0.526. Conclusions. The data obtained allow us to note that the functional state of the endothelium and its activity depends on the content of body weight components in the organism.