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Validity of predictive equations for determining resting energy expenditure
Fabián, Patrik ; Korvas, Pavel (referee) ; Chlíbková, Daniela (advisor)
This bachelor thesis deals with the validation of predictive equations to determine resting metabolic rate. The objective of this bachelor thesis was to compare individual predictive equations for determining resting metabolic rate with self-measurement using indirect caloriemetry and to establish a own procedure for predicting resting metabolic rate. The evaluation of each predictive equation was based on statistical analyses. Based on statistical analyses, it was found that the available predictive equations underestimate resting metabolism by an average of 20 % of kilocalories per day compared to the value measured by indirect calorimetry. Machine learning was used to determine the actual procedure for predicting resting metabolic rate, which was then presented using the user interface. The following testing showed that the neural network for predicting resting metabolic rate provides more accurate results compared to the available predictive equations.
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Evaluation of oxidation of nutritional substrates during pregnancy.
Huličiarová, Klaudia ; Hronek, Miloslav (advisor) ; Kovařík, Miroslav (referee)
Background The aim of this diploma thesis was to determine and evaluate changes in resting energy expenditure and oxidation of nutritional substrates, then to assess connections with other parameters and to compare these results with other conducted studies. Methods Indirect calorimetry was used to determine resting energy expenditure and oxidation of nutritional substrates. Measurements of pregnant women took place after a 12-hour fast in three periods of pregnancy. The first period between 17.-27. week of pregnancy, the second between 28.-35. weeks of pregnancy and the last during the 36th-38th week of pregnancy. Results The results of the work point to significantly increasing values of respiratory quotients (p = 0.022) and carbohydrate oxidation (p = 0.015) with the length of pregnancy, and to statistically significant correlations between the oxidation of nutritional substrates and the values of RQ, NPRQ, the volume of excreted urine, the amount of creatinine, urea and nitrogen in the excreted urine. Conclusions In this work, an increase in respiratory quotient values and carbohydrate oxidation during pregnancy was confirmed. However, the suspension of the study due to the Covid situation caused a decrease in the number of pregnant women followed and the necessary results. Key words:...
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Determinating basal metabolic rate by indirect calorimetry method
POSTL, Roman
The topic of the bachelor thesis is "Determination of resting energy expenditure by indirect calorimetry". The method of indirect calorimetry is considered the gold standard for determining resting energy expenditure, which can further serve as a basis for setting optimal energy intake for the design of therapeutic diets, and is often compared with predictive equations, with which the determination of resting energy expenditure is simpler and less time-consuming. Data collection was performed by quantitative methods by measuring on indirect calorimetry, assessing dietary records and completed questionnaires, and obtaining anthropometric data. The research population consisted of 10 respondents approached through mass email correspondence or in person. The main aim of the study is to compare the results of the indirect calorimetry method with the recalculated results of the Harris-Benedict predictive equation on resting energy expenditure values. A sub-objective is to map the differences in measurement results based on the diet composition of the respondents. Together with this objective, the dissimilarity of energy intake versus calculated energy requirement is mapped, and lastly, the dissimilarity of measurement results due to respondents' body composition is mapped. As a result of the research, the deviation of +-10% between the measured and calculated values of resting energy expenditure is confirmed, which is also reported by authors of publications on a similar topic. Furthermore, the research shows a deviation of 18.34% between the recorded energy intake and energy requirement with a tendency to underestimate dietary intake. The study also shows relationships between the measurement results and the percentage of diet and body composition of the respondents. The relationships are based on linear trend lines, which indicate, first - an increase in measured values with a higher proportion of protein and carbohydrate in the diet and a higher proportion of lean body mass, and second - a decrease in measured values with a higher proportion of fat in the diet and a higher proportion of adipose tissue in the body.
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Body composition parameters in dependence on the metabolism degree in patients with COPD
Doleželová, Magdaléna ; Kovařík, Miroslav (advisor) ; Hronek, Miloslav (referee)
Charles University in Prague Faculty of Pharmacy in Hradec Králové Department of Biological and Medical Sciences Student: Magdaléna Doleželová Supervisor of master thesis: PharmDr. Miroslav Kovařík, Ph.D. Title of master thesis: Body composition parameters in dependence on the metabolism degrese in patiens with COPD Chronic Obstructive Pulmonary Disease (COPD) is a very serious illness characterized by incompletely reversible airflow obstruction and lung emphysema. Contributes to its overall severity are extrapulmonary manifestations, especially cachexia and loss of lean tissue mass. Chronic inflammation of the respiratory airways and increased respiratory effort cause the hypermetabolic state to some patients with COPD. This thesis investigates the impact of increased metabolism on body composition in patients with COPD. Our study included 50 COPD patients (38 men, 12 women) who were examined by bioelectrical impedance. In this study, we compared the parameters of body composition of men with resting energy expenditure REE > 130% (hereinafter Men over 130%) (n = 9) and the group of men with REE < 130 % (hereinafter Men below 130 %) (n = 29). In the group of Men over 130 % we found a lower average value of body weight by 18 % compared to Men below 130 %. Total body and intracellular water were 12 %...
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Resting energy expenditure at polytraumatic patients.
Šimandl, Ondřej ; Hronek, Miloslav (advisor) ; Havel, Eduard (referee)
The aim of this study was to determine and evaluate resting energy expenditure (REE) and the utilization of nutritional substrates in 14 polytrauma patients in the ICU. Was also assessed level of impact Overhydration (OH) on the accuracy of the determination. Diagnostic investigations using indirect calorimetry (IC) was performed in 9 men and 5 women (age 30 ± 15 years, BMI 27.5 ± 9.4 kg·m-2) with polytrauma (ISS 41 ± 16). For more accurate sizing of REE and extent of utilization of nutritional substrates were used equations derived from the equation of Weir, not Softwear calorimeter. Using IC volumes were determined only inspired an expired oxygen and carbon dioxide. To determine the rate of OH was used bioimpedance analysis methods using BCM. Almost 86% (8 men and 4 women) examined patients showed hypermetabolism. Average REE value was 2241.38 ± 854.27 kcal·day-1, which represented an average increase of prediction of 38.09 ± 49.09% due to the physiological condition. A statistically significant relationship was demonstrated between REE determined using the Weir equation according and the Harris-Bennedict equation without (P = 0,01) with deduction of OH (P = 0,007) only in men. In clinical practice, significant correlations were established between the REE-IC and BSA (P < 0,01), LTM (P < 0,05),...
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Changes in resting energy expenditure in lactating women
Mrózková, Nancy ; Hronek, Miloslav (advisor) ; Kovařík, Miroslav (referee)
The aim of this thesis was to evaluate changes in resting energy expenditure (REE) in ten lactating women between three weeks and nine months postpartum to find out whether there is any link with the parameters presented in this study. Measurements were taken at four intervals. At three weeks and at three, six and nine months postpartum. They were taken in the morning after a night fast (12 hours) and used indirect calorimetry with a canopy in awake lying subjects for approximately 25 minutes. The room was shaded with minimal noise with a temperature around 20 řC. Urine was collected over 24 hours and was examined for nitrogen concentration. The median REE was 1591,86 kcal/day at 3 weeks postpartum, 1398,08 kcal/day at 3 months, 1401,78 kcal/day at 6 months and 1455,03 kcal/day at 9 months postpartum. Values of REE per kilogram of body weight are 21,8 ± 0,36 kcal/kg and are consistent throughout the measurement period. The oxidation of lipids was dominant compared to other substrates and the lowest was oxidation of sacharides during the whole observation period. Correlations were found in parameters such as, body weight and REE per kilogram, breast milk and respiratory quotient (RQ), length of gravidity with RQ/ volume of exhaled carboxydioxide/ volume of inhaled oxygen. Another was between protein...
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Resting energy expenditure during lacatation.
Klečka, Michal ; Hronek, Miloslav (advisor) ; Kovařík, Miroslav (referee)
Background The aim of diploma thesis was to evaluate resting energy expenditure (REE) and substrate oxidation in Czech lactating women and their relation to measured anthropometric parameters. Methods The indirect calorimetry was used to asses REE. Subsequently, the oxidation of substrates was calculated. At the same time were measured anthropometric parameters of breastfeeding women. Then the correlation was investigated. The total amount of examination were three times. First was in the time three weeks after birth, the second one was three months postpartum and the last was six months after birth. Results The mean values of REE in lactating women were 1577±93 kcal/day in the time of three weeks after birth. Three months after birth it was 1622±140 kcal/day. Six months after birth it was 1545±80 kcal/day. Significant positive correlation was proved between REE and triceps skinfold thickness (r = 0,98; P < 0,05) and also chest circumference (r = 0,99; P < 0,05). Both were three weeks after birth. Breastfeeding women had a value of lipid oxidation 60 % of substrate oxidation three weeks postpartum, which decreased to 46 % three months postpartum due to sharp increase (from 8 % to 18 %) of carbohydrate oxidation value. This increase could correspond to the preferential use of glucose by the mammary...
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Effect of body composition on resting metabolic rate in obese patients
Staňová, Alžběta ; Sadílková, Aneta (advisor) ; Mikeš, Ondřej (referee)
Introduction: Changes in eating habits and incorporation of physical activities remain to be the main methods in treating obesity. To set an adequate calorie intake, which would lead to weight loss, it is necessary to determine energy needs of an individual. For that energy intake and energy expenditure need to be determinate. However, energy expenditure is difficult to determine since it is contributed of three components. Basal, respectively resting metabolic rate (RMR), which is affected by a body composition, has the greatest influence on a total energy expenditure. Indirect calorimetry (IC) is considered to be a gold standard to determine RMR. When RMR is calculated by prediction equations instead, such as Harris-Benedict (H-B) equation, energy needs are overestimate or underestimate for people with abnormal body composition. Objectives: The aim of this study is to analyse data of RMR obtained using IC in connection to body composition. The main aim is to determine how fat free mas (FFM) and fat mass (FM) are affecting RMR in obese patients. There is also a comparation of RMR measured by the IC and RMR calculated using H-B equation as a part of this study, while IC is considered to be a reference method. Methods: Patients new to ambulance of obesitology at General University Hospital in Prague...
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