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Classification of heart beats using artificial neuronal networks
Doležalová, Radka ; Vítek, Martin (referee) ; Ronzhina, Marina (advisor)
This work deals with using of artificial neural networks (ANN) for ECG classification. The issue of ECG and ANN technique are described theoretically at first, the next section describes use of Matlab to design ANN and graphical user interface. ECG data (namely QRST segments from the orthogonal X- lead from seven phases of the experiment) obtained from experiments in isolated hearts of rabbits are used for learning and testing of the classifier. The result of this work is the software with GUI that allows user to set various parameters and structure of ANN. After learning phase, ANN realized in this work able to classify cardiac cycles according to their morphology into seven groups.
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Classification of mental workload using brain connectivity measure
Doležalová, Radka ; Kolářová, Jana (referee) ; Ronzhina, Marina (advisor)
Tato práce se zabývá využitím EEG dat pro výpočet mozkové konektivity a vytvořením klasifikátoru mentální zátěže. Nejdříve je popsán teoretický základ EEG, následně jsou rozebrány některé metody pro určení mozkové konektivity. Pro výpočet klasifikačních příznaků byla použita data nasnímaná během experimentu, který manipuloval s mentální zátěží ve dvou stupních. V práci je popsán průběh experimentu, zpracování a redukce nasnímaných dat, stejně jako extrakce příznaků z nasnímaných EEG dat pomocí několika metod měření konektivity (korelační funkce, kovariance, koherence a míra fázové soudržnosti) a následná automatická klasifikace třemi způsoby (na základě vzdálenosti od vzoru tvořeného průměrem, metoda nejbližšího souseda a diskriminační alanýza). Dosažené výsledky jsou detailně popsány a diskutovány. Nejlepšího výsledku (úspěšnost 60,64%) bylo dosaženo při použití kovarianční matice určené z dat získaných ze 4 elektrod z různých mozkových oblastí (beta pásmo EEG) při klasifikaci založené na lineární diskriminační funkci.
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Diet comparison of athletes from different types of gymnastics
Kudláčková, Tereza ; Vilikus, Zdeněk (advisor) ; Petráková Doležalová, Radka (referee)
Gymnastics is an aesthetic sport in which the emphasis is placed on optimal physical appearance. However, this is often associated with maintaining an inadequately low body weight, which can have a negative impact on both health and sports performance. For some of its features, gymnastics is thus found to be one of the possible risk factors for eating disorders. When it comes to the teenage population of female athletes, the aforementioned issue becomes even more important. Teenage gymnasts between the ages of 15 and 18 from two gymnastic sports, rhythmic gymnastics and aerobic gymnastics, participated in the research carried out as part of this diploma thesis. The aim was to find out whether the diet of gymnasts differs depending on the different sports and whether these gymnasts consume food adequately both in terms of its quantity and quality. For this purpose, the gymnasts recorded their food intake, while the 4-day food records provided by 8 representatives of rhythmic gymnastics and 8 representatives of aerobic gymnastics were subsequently evaluated. Based on the average of 4 individual days data and comparing the results with the recommendations, it was found that the diet of the gymnasts was insufficient from an energy point of view. On average, the participants did not reach the...
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Comparison of a standard adult non-athlete diet and a diet of an athlete in preparation for bikini fitness competitions
Jakubičková, Tereza ; Vilikus, Zdeněk (advisor) ; Petráková Doležalová, Radka (referee)
Title: Comparison of a standard adult non-athlete diet with a diet of athlete in preparation for bikini fitness competitions Aim of the thesis: The primary goal of this bachelor's thesis was to compare the differences between the regular diet of adult non-athletes and the pre-competition diet of female athletes who are preparing for bikini fitness competitions. The aim of the work was to analyze the individual differences between the diets, with the help of calculations of the total daily energy intake of the respondents, the amount of macronutrients, simple sugars and fiber in their diet, a comparison of the daily drinking regime, subsequent entry into graphs and a visual comparison of the diets. The secondary goal of this work was to acquaint the reader with the nature of the pre-race diet, its principle and its effect on the change in the body composition of the female athlete during the pre-race preparation. This work also aimed to present the effect of a precisely set and strictly observed diet, thanks to which a significant change in body composition can be achieved. Readers of this work will, among other things, learn about various dietary methods for reducing body fat and at the same time for preserving muscle mass during a caloric deficit. Methods: The work was carried out in the form of a...
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The role of adipose tissue in endothelial dysfunction, etherosclerosis and other complications of metabolic syndrome: influence of diet and pharmacotherapy
Doležalová, Radka ; Haluzík, Martin (advisor) ; Šenolt, Ladislav (referee) ; Kábrt, Jan (referee)
The metabolic effects of obesity have made this disease one of the most common risk factors for diabetes, hypertension, and atherosclerosis. Adipose tissue is now recognized as an active secretory and immune organ. Chronic inflammation is a common feature of the obesity, and inflammatory signals may originate within visceral adipose tissue as this fat depot expands in response to chronic positive energy balance. Both adipocytes and macrophages within fat secrete numerous hormones and cytokines that have local effects on WAT physiology but also systemic effects on other organs and may markedly contribute to the development of pathophysiological disorders associated with metabolic syndrome. On the contrary, leanness as well as significant weight reduction in obese patients increases production and circulating levels of metabolically beneficial factors and decreases production of proinflammatory and insulin resistance-inducing factors. Endothelial dysfunction and inflammation are important signs of vascular risk and worsened prognosis in patients with metabolic syndrome and type 2 diabetes. Measures of endothelial function remain invaluable for research into disease mechanism and response to new therapies. An interesting area of ongoing investigation is the role of thiazolidinediones in improving endothelial...
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Fitness center clients nutrition focused on protein and magnesium intake
Pajič, Barbora ; Vilikus, Zdeněk (advisor) ; Petráková Doležalová, Radka (referee)
The diploma thesis deals with the importance of protein and magnesium in the diet of recreational visitors to fitness centers. Excessive protein intake at the expense of other macronutrients is a very common phenomenon in the fitness sector. Magnesium is an important element for muscle regeneration and its deficiency can have a negative effect on weight reduction and muscle gain, leading to fatigue and cramps, which many athletes encounter. As visits to the fitness center become more and more popular nowadays, it is important that athletes are not subject to misleading and confusing information from the internet and look for proven sources. The aim of the diploma thesis was to compare eating habits, especially protein and magnesium intake, in two groups of people divided according to the frequency of training in the fitness center. This work is divided into theoretical and practical part. The theoretical part deals with nutrition in the fitness industry in general, but more attention is focused on proteins and magnesium. Quantitative research using a questionnaire survey was chosen for the practical part of the work. A total of 30 respondents participated in the research, divided into two groups - athletes and non-athletes. Non-athletes were considered to be those who have two or fewer workouts per...
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Differences in the eating habits of rowers and crossfit athletes
Kadlecová, Nikola ; Vilikus, Zdeněk (advisor) ; Petráková Doležalová, Radka (referee)
The theme of this thesis is sports diet. It is divided into two parts. A theoretical part explains balanced died. It describes the mechanics of energy generation during physical activity and the characteristics of rowing and Crossfit. The focus is on diet in those disciplines. Based on the theoretical foundation is build a practical part, where the statistical data are analyzed and evaluated. The goal of this thesis is to discover, whether there is a difference between rower's and Crossfit athlete's diets. To find out, specialized questionaries about eating habits have been used. Sixteen sportsmen/sportswomen have filled the questionaries. Based upon collected data about their intake of selected nutrients in the last month, there were no statistically significant differences in energy income, protein consumption (neither animal nor plant-based), amount of fruit and vegetables, fatty acid spectrum nor added sugar income. The data have nonetheless indicated differences, eg. Crossfitters tend to have higher animal protein consumption and lower intake of fruit. Key words: crossfit, eating habits, nutrition, rowing, sport diet
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Nutrition of astronauts
Žabová, Anna ; Vilikus, Zdeněk (advisor) ; Petráková Doležalová, Radka (referee)
This non-experimental diploma thesis is focused on nutrition in space and all aspects associated with it. The first part deals with human physiology in microgravity. These are changes affecting the musculoskeletal, cardiovascular, digestive, immune and central nervous systems, but also the consequences of long-term isolation, confined space and cosmic radiation in terms of the nutritional profile of space mission participants. The second part describes the spacefood system and maps the Soviet (later Russian) and American past, present and future in terms of the development of space nutrition and food. The third part focuses on the functioning of space medicine and dietetics, together with interesting projects and programs that have helped or continue to help improve space food systems. Thanks to these programs, the future settlement of the universe will become more realistic. keywords: nutrition, nutrition in space, spacefood, cosmonaut, astronaut, space
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Eating disorders at ski jumping athletes
Ptáčková, Veronika ; Vilikus, Zdeněk (advisor) ; Petráková Doležalová, Radka (referee)
In my bachelor's thesis I have been dealing with a risk behavior in the field of nutrition of Czech men and women ski jumpers. The goal of the bachelor's thesis was to find out whether Czech men and women ski jumpers maintain their physiological weight, whether they use inappropriate practices (for example, induction of vomiting) in the context of weight loss. I also investigated whether there is an effort of the International Ski Federation to reduce the risk of eating disorders among athletes engaged into this discipline. In the theoretical part of this bachelor's thesis, I focused on individual types of eating disorders, risk factors for their occurrence, health complications associated with eating disorders or the epidemiology of these disorders. Furthermore, I focused on the ski jumping itself, explained the rules, especially those concerned about the weight of jumpers. I found out how important is the weight of the jumper in the final length of his jump. I also focused on the development of body weight of professional ski jumpers. The practical part was realized in the form of own designed non-standardized questionnaire. The questionnaire was filled in by 49 respondents, 17 women and 32 men. According to the BMI, a third of respondents are underweight, more often women (55 % of women). A...
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What is My Car Worth? Hedonic Price Analysis of the German Used Car Market
Doležalová, Radka ; Polák, Petr (advisor) ; Červinka, Michal (referee)
Valuation of used cars, affected by various technical attributes and information asymmetry, is the key objective of all agents operating on the automobile mar- ket. This thesis, focusing on a hedonic price analysis, aims to determine basic as well as additional attributes as determinants of a used car market price. In addition, the analysis sheds light upon novel attributes (service records, cigarette smoke pollution of a vehicle interior, selling channel factor in the e- commerce environment, and a German geographical division). The hedonic price research uses the unique data sample of the German used car market, extracted from the database of the e-commerce platform AutoScout24 com- prised of almost 51 thousand vehicles and 57 attributes. The model selection is specified by the incorporation of the Bayesian model averaging approach. The research proves the complexity of a valuation of a used vehicle in a term of a substantial number of relevant variables. The most interesting innovative conclusions are non-significant effect of selling channels and small local price differences among two German regions. Remarkable are also the significant effect of the status of previous owners, bodywork colour, and smoke pollution. The estimated vehicle lifespan of 10 years shows that cars have shorter than...
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