Diet optimization in patients with obesity and diastolic heart failure based on the assessment of indicators of metabolism during physical exertion

• A.R. Bogdanov
• Z.M. Gioeva
• O.R. Galeeva
• D.S. Shamsheva

Abstract

The objective of the work was to examine the performance of basal metabolism and body composition in obese patients with diastolic heart failure (DHF) to identify optimal needs of these patients in the nutrients and energy. We studied 222 patients with obesity, that were divided into four groups depending on the degree of obesity and the presence or absence of DHF with preserved systolic function of the left ventricle (2 groups of obese patients with an initial degree I-II, 2 groups - a pronounced degree of obesity III). Basal metabolism by indirect respiratory calorimetry, physical activity at home and cardiorespiratory exercise testing were evaluated in these groups of patients. It has been shown that patients with obesity and secondary DHF have significantly lower physical activity during the day, resulting in the reduction of the overall length of the active time of day to 18.5-26.9%, and in the decrease of the proportion of time performing heavy and moderate work to 27.6-80.3%. Anaerobic threshold in obese patients I-II degree was 62.9% of maximum oxygen consumption (VO_2pik) (rate is more than 60%), in patients with obesity III degree - 77.6% of VO_2pik. Alveolar gas exchange also was not broken - the CO₂ ventilation equivalent was equal respectively 23.4±2.8 and 28.9±1.5 (rate is less than 32). Thus, cardiopulmonary exercise testing have demonstrated that cardiopulmonary causes of dyspnea in obese patients without DHF were absent; and the reason for the decrease of exercise tolerance in patients with obesity III degree was the detraining. The reason for inactivity in patients with obesity and DHF was a marked reduction in exercise capacity due to violations of alveolar ventilation and reducing aerobic capacity of muscles. It was found that accustomed physical activity of patients at home didn't allow patients with obesity and DHF to carry out effective fat oxidation, due to the rapid achievement of the anaerobic threshold. It has been suggested that this effect may be the cause of metabolic progression of obesity in patients with DHF. It was found that patients with obesity and secondary DHF were characterized by a more pronounced oxidation of the protein, compared with similar patients without DHF, which made actual the muscle mass patronage under diet therapy management of patients. The optimum performance of the chemical composition and energy value of the diet have been calculated forpatients with obesity of varying severity in conjunction with SDS.

Keywords:heart failure, obesity, cardiopulmonary exercise test, basal metabolism, energy metabolism, diet, metabolic status

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