National Repository of Grey Literature 152 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Steam boiler for fytomass
Baláš, Jiří ; Ing. Obrovský (referee) ; Skála, Zdeněk (advisor)
The purpose of this Diploma Thesis was the construction design of the steam boiler for fytomass. For the specified parameters of biomass have been gradually implemented stoichiometric calculations of which are further based calculation of enthalpies of combustion gas. In the next part have been dealt with heat balance of the boiler, the efficiency of the boiler, recirculation of exhaust gases and the temperature of the combustion gases in outlet from fire. Thereinafter, the proposal of particular heat surfaces of steam boiler was solved, so that the resulting number and size correspond to the desired parameters. The parameters are temperature, pressure and the amount of steam.
Benefits and risks of Parkrun
Pokorný, Matyáš ; Baláš, Jiří (advisor) ; Bačáková, Radka (referee)
Title of thesis: Benefits and risks of Parkrun The thesis dealt with the Parkrun project, which can be classified as outdoor activity. The aim of the thesis was to assess the health and social benefits and risks of Parkrun. This is a research paper, the main sources of information of which were the electronic database EBSCO and the official website of the Parkrun organization, together with electronic articles and reports about Parkrun. When assessing the health benefits and risks of Parkrun, the thesis reached the following conclusions: Parkrun brings physical health benefits in the form of general improvement and maintenance of physical fitness. In particular, it helps to reduce the level of cholesterol in the blood, reduce the risk of obesity, diabetes, and thus represents the prevention of the occurrence of civilization diseases. In addition, it can dampen the symptoms of asthma and help reduce the inflammation of the airways. Risks for physical health can be extreme manifestations of the weather - especially heat or cold. Another risk may be the load on the joints in the case of incorrect technique and the predominant hard surface. Parkrun also brings benefits in the field of psychological health in the sense of a general feeling of satisfaction, happiness, joy, self-confidence, as well as a...
Relative Age Effect in Czech Sport Climbing
Lonský, Ondřej ; Bačáková, Radka (advisor) ; Baláš, Jiří (referee)
Title: Relative Age Effect in Czech Sport Climbing Objective: The aim of this thesis is to investigate the manifestation of the Relative Age Effect in selected talented youth and the adult national team of sport climbing in the Czech Republic. Methods: The study analyzes the statistical significance of the expected and actual distribution of birth months in the sample studied. The research sample includes 173 subjects who have been selected for Youth Sports Centers, Elite Sports Centers for Youth, or National Sports Centers for Youth and the national sport climbing team. The chi-squared test, in the form of a goodness-of-fit test, is used to assess the manifestation of the Relative Age Effect. Results: In the overall sample studied (173 subjects), no statistically significant difference was found in the frequency of births between the first and second halves of the year. The Relative Age Effect was not demonstrated in men, while in women, a statistically significant difference was found, with a higher number of births in the first half of the year. This indicates the presence of RAE in women in Czech sport climbing. Further results relate to specific groups within the sample, such as members of youth sports centers and national teams. Conclusion: The manifestation of the Relative Age Effect was...
Risks of Alpine Hiking on Protected Climbing Routes
Šupka, Matěj ; Baláš, Jiří (advisor) ; Brtník, Tomáš (referee)
Title: Risks of Alpine Hiking on Protected Climbing Routes Aims: The aim of this thesis was to assess the risk factors of alpine hiking on protected climbing routes based on a current literature review. Methods: The primary sources were articles from the Web of Science and EBSCO databases. Results and conclusions: The total accident rate on protected climbing routes in Austria amounted to 1684 cases from 2008 to 2018. It was found that great progress has been made in terms of equipment and safety on protected climbing routes together with technical advancements in gear. The current equipment represents groundbreaking technology that significantly reduces the occurrence of serious injuries during this activity. However, when using fall absorbers, younger and lighter climbers are still at a higher risk of injury. Keywords: Via ferrata, alpine hiking, klettersteig, equipment, safety, trekking
Effect of caffeine on local isometric performance of finger flexors in sport climbers.
Ťuka, Jeroným ; Baláš, Jiří (advisor) ; Krupková, Dominika (referee)
Title: Effect of caffeine on local isometric performance of fingers in sport climbers. Targets: The aim of this study was to investigate whether caffeine affects local isometric finger flexor performance in sport climbers during a 4 minute all-out test and the maximal force test. Methods: 12 climbers participated in the testing during 3 visits to the LSM laboratory at the UK FTVS. During each visit, they completed a maximal strength test, a force gradient and an all-out test on a specific dynamometer. During the second and third testing we randomly administered caffeine or a placebo to the climbers and monitored whether there was a change in performance. Results: The average maximal force during the initial measurement was 48.8 kg (σ = 12.5 kg), with caffeine supplementation the average maximal force increased to 48.9 kg (σ = 11.5 kg). The average total work during the initial measurement was 3573.3 kg.s (σ = 810.2 kg.s), with caffeine supplementation there was an increase to 3700.8 kg.s (σ = 865.7 kg.s). The average work performed above critical strength during the initial measurement was 1242 kg.s (σ = 726 kg.s), with caffeine supplementation there was a decrease to 1215.2 kg.s (σ = 456.1 kg.s). The average critical force during the initial measurement was 15 kg (σ = 5.9 kg), increasing to 15.9...
Physiological response to adventure activity
Řezník, Ondřej ; Psohlavec, Lukáš (advisor) ; Baláš, Jiří (referee)
Objectives: The aim of this study was to investigate the effect of height on the physiological response of the body and walking speed during challenge activity. Methods: The study included 27 subjects, with an average age of 23±2, who were students of the Faculty of Physical Education and Sport (FTVS) at Charles University. The participants walked for 4 minutes over a low obstacle and 4 minutes over a high obstacle at their own pace, followed by 4 minutes over a low obstacle at a specified speed. The monitored parameters were heart rate (HR) and speed (V). Results: The average HR during walking over a low obstacle at the specified speed was 100 beats per minute (σ=12.335), and the average speed was 0.272 (σ=0.221). During walking over a high obstacle, the HR was 133 beats per minute (σ=16.125). During walking over a low obstacle at their own pace, the average HR was 111 beats per minute (σ=13.416), and the average speed was 0.706 (σ=0.269). Conclusion: Walking at height reflects the subjectively perceived risk through physiological responses. The height of the obstacle, which induces a subjectively perceived risk, increases the heart rate by 33 %. The walking speed decreased by an average of 0.434 m/s on the high obstacle. Kewords: adventure education, risk, heart rate, stress.
Effect of caffeine supplementation on force gradient in forearm flexors
Běhounek, Michal ; Baláš, Jiří (advisor) ; Krupková, Dominika (referee)
Title: Effect of caffeine on rate of force development of finger flexors Objectives: The goal of this study is to assess the effect of caffeine on rate of force development of finger flexors. Methods: 10 hobby sport climbers (7 men, 3 women in age 20-34 years) during 3 visits of laboratory submit specific test to evaluate rate of force development of finger flexors. First measurement was the control one, in other two they were suplement by amout of 5mg/kg caffeine or placebo, in random order. The participants were measurement also for maximal strengh and and 4minutes all-out test. Results: Maximal speed of contraction in control measurement was in average 170,1 ± 54,3 kg/s. After suplementation of caffeine the average rises up to 190,9 ± 43,3 kg/s. The placebo average value was 156,9 ± 60,9 kg/s. Paired T-test does not confirm any significant differences between control measurement and measurement after caffeine suplementation. Conclusion: Results shown that caffeine does not affect the rate of force development of finger flexors. Key words: sport climbing, rate of force development (RFD), climbing dynamometer
The effect of height on perceived anxiety when overcoming a challenge obstacle
Bóday, Anna ; Baláš, Jiří (advisor) ; Zdobinský, Adam (referee)
Title: The effect of height on perceived anxiety when overcoming a challenge obstacle Objectives: The aim of this final thesis was to determine the immediate psychical response of overcoming the adrenaline barrier in the natural environment. In two cases. At first without the heigh aspect and than with this height aspect. Afterwards we had compared difference between measure of anxiety in these two cases. Then we had compared the difference in the level of anxiety between women and men. Methods: The method of researching was standardized questionnaire CSAI -2, with 27 questions. Which targets three areas of anxiety - somatic, cognitiv, self-confidence. We had a group of 34 respondents with 20 female and 14 male aged 20-26. They had to answer on this questionnare just before they overcome the obstacle. First on the floor, and than up in eleven metres above the ground. Data was analyzed by statistic program R 4.1.2. Results: Between the low and high logs, there was a significant increase in somatic anxiety (V = 43, Padj <0.001) and cognitive anxiety (V = 93, Padj = 0.002), at the same time, there was a decrease in self-confidence (df = 33, t = 4.06, Padj <0.001). Anxiety levels between the low and high log are highly correlated for both somatic (τ = 0.478, z = 3.78, Padj <0.001) and cognitive anxiety...
Effectivity of localized and whole-body active recovery strategies after exhaustive isometric finger flexor performance
Sechterová, Hana ; Baláš, Jiří (advisor) ; Vomáčková, Helena (referee)
Author: Title: Objectives: Methods: Results: Bc. Hana Sechterová Effectivity of localized and whole-body active recovery strategies after exhaustive isometric finger flexor performance Determine the effect of localized and whole-body active recovery on repeated exhaustive isometric performance of fingers flexors. Determine the effect of systemic and muscle oxygen kinetics on level of recovery of fingers flexors during two types of active recovery. 7 men (age 31,3 ± 8,3) and 6 women (age 30,7 ± 8,1) underwent tests of systemic and muscle oxygen kinetics, then repeated intermitent isometric contractions of fingers flexors until exhaustion in three visits. The randomly chosen type of active recovery (with global enagaging of muscles, with isolated engaging of fingers flexors) was applied among tests until exhaustion. The performance of fingers flexors until exhaustion was measured in the intermitent test (8 s contraction, 2 s relaxation). Systemic oxygen kinetics (VO2max) was measured by using maximal oxygen consumption and ventilatory anaerobic threshold (VT2). Muscle oxygen kinetics was measured by using infrared spectroscopy. The relationship among systemic and muscle oxygen kinetics and decrease of fingers flexors performance until exhaustion was calculated using the Pearson correlation...

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10 Balaš, Jan
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3 Baláš, Jiří
1 Baláš, Josef
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