The aim of the diploma thesis is the design and implementation of methods for detecting fatigue in electromyogram (EMG). At first is done a literature review on the topic of fatigue detection in electromyography (EMG). Measurement of fatigue-induced changes in the EMG signal is performed on ten subjects using the Biopac ©. Next is in the thesis solved the selection of the optimal methods of evaluating the fatigue-induced changes in EMG recording using statistical testing. In the final part of the thesis is discussion on the results of statistical testing, creation a user interface in Matlab © and comprehensive instructions for laboratory focused on the topic of fatigue in the EMG signal.

This doctoral thesis deals with the fatigue behaviour of AZ31 and AZ61 magnesium alloy casted by advanced methods of casting squeeze casting. Based on the regression functions and measured fatigue data were determined fatigue characteristics of these alloys. The work also extends into the area of fatigue cracks in the AZ31 alloy. Were measured fatigue crack propagation rate on modified cylindrical specimens. The paper also outlines the possibilities for describing the fatigue behaviour of AZ61 alloy in extremely low-cycle fatigue.

Title Changes speed indicators by influence of specific fatigue in soccer players. Aim of Study Diagnose specific effects of fatigue from the soccer match on the manifestation of speed abilities of football players at AC Sparta Praha categories of players up to 19 years. Method Selected research sample consists of 11 players on the year of birth 1994 (3 players), 1995 (7 players) and 1996 (1 player) U19 category. Tested sample passed measurement in one friendly match against the same old players. They passed the test 4 times before the game, 4 times at the half-time break and 4 times immediately after game. During this testing, I watched the effect of fatigue on specific speed capability of players. At work, I used a quantitative research method. I prepared and statistically evaluated the resulting data obtained during testing using photocells. Results Testing was attended by 11 players from selected professional club team U19 category . Measurement of speed in field test was measured using photocells Brower Timing System. The results provide informations about the speed capabilities of the players and their reduction during the fatigue gradually emerging during a football game. The results reveal that the speed capabilities of most players were reduced. They also briefly deal with the question...

The theses Know-how in high-cycle fatigue applied in expert engineering inquires into expertising the after-effects of dynamic loading in the scope of high-cycle fatigue. It uses a non-destructive testing (acoustic emission) to confirm laboratory testing. The usage of the measuring results from mechanical testing and the records of the AE material activity does not only determine laboratory qualities, but, moreover, serves a professional finding description purpose to expert witnesses and expert engineers. A real condition all-embracing analyses of the tested component part was carried out, part of which was the chosen fatigue loading simulating the work load of the component part.

Diplomová práce se zabývá návrhem metodiky pro stanovení vlivu vibrací na únavovou životnost a rychlost šíření trhlin u vztlakových klapek letounu L 410 NG. Úvodní část práce obsahuje potřebné informace o letounu a zatížení vztlakových klapek. Poté jsou popsány prostředky pro kvantitativní popis únavového procesu s využitím napěťového přístupu. Pro objasnění navrhované metodiky je uvedena definice obecného náhodného procesu a popis postupů aplikovaných na data získaná z letového měření. Hlavní část práce obsahuje podrobný popis navržené metodiky. Ta je zároveň aplikována na data získaná z měření na letounu L 410 UVP-E20.

This diploma thesis addresses the issue of tiredness. I analyze tiredness from the point of view as the problem that may occur during the teaching process. The theoretical part is focused on the explanation of the concept of psychohygiene, from its historical development to the modern concept, i.e. mental health, tiredness, types of tiredness, its stages and determinants, the specification of the period of adolescence, the influence of environment on the individual. The part of the research addresses the root causes of student´s tiredness. It focuses on the subjective feeling of the perceptions of tiredness with regard to the day of the week, time, the environment of the high school, the influence of natural stimulants.

Title: EMG analysis of lower limb muscles in dependence on growing muscle fatigue Objectives: The main objective of this thesis is monitor and evaluate changes in EMG parameters of muscles of low extremities depending on the level of local muscle fatigue (during exercise on legpress. Methods: Study included 8 subjects who completed the exercise on weight lifting machine legpress, while we were measuring 6 muscles on lower extremities by using surface EMG. The measuremets was at level 75 % of maximum weight, when probands doing exercises until he had complete muscle fatigue. Data from electromyography was processed and through them we could watched the spectral distribution of the EMG signal and changes of EMG amplitude, which we relate to maximal voluntary contraction. Results: After analysis of all 48 measured muscles, increased of EMG amplitude occured in 45 of them. There was 67 % statistically significant, another 6 % was really close to significant level and remaining 23 % was insignificant. We have 144 time series in analysis of quartile milestones (Q25, Q50 and Q75). From this number decrease of frequency occured 135 times. There was 75 % statistically significant. Then we found out that biggest decreased was in median and mainly in Q75, it was in 82 %. Conclusions: Study proved that during...

Title: EMG analysis of lower limb muscles in dependence on growing muscle fatigue Objectives: The main objective of this thesis is monitor and evaluate changes in EMG parameters of muscles of low extremities depending on the level of local muscle fatigue (during exercise on legpress). Methods: Study included 8 subjects who completed the exercise on weight lifting machine legpress, while we were measuring 6 muscles on lower extremities by using surface EMG. The measuremets was at level 75 % of maximum weight, when probands doing exercises until he had complete muscle fatigue. Data from electromyography was processed and through them we could watched the spectral distribution of the EMG signal and changes of EMG amplitude. Key words: amplitude analysis, spectral analysis, surface polyelectromyography, muscle fatigue

Title: The influence of water temperature on the rate of recovery during repeated isometric exercise. Objectives: The aim of this thesis is to assess the effect of water temperature on immersion of forearm to water for the sake of speeding up the recovery process during repeated isometric performance. Methods: Five male subjects from the students of FTVS (average age 22 ± 3 years) underwent three meaurements with repeated exercise to exhaustion with various kinds of rest periods. The exercise was represented by three series of intermittent isometric contraction of the finger flexors until exhaustion with 20 minutes rest period. The rest period was represented by the immersion of forearm into cold water (8řC; 15řC;) as well as by a passive rest. Sturation O2 of saturated hemoglobin (SmO2) was monitored by the spectrometer throughout the entire measurements at flexor digitorum profundus. Results: The reliability of measurements was rel=0,79 with standard deviation SD= 27,3s and standard measurement error SEM= 12,5s. The least effective method of recovery was passive recovery. Decrease in the time between the first, second and third contraction respectively was 35s, 34s respectively. Immersion in 15 ř C water under recovery phase led to improvement in the second contraction by 43s and by 27s in the...

This thesis focuses on the physical and mental hygiene habits of younger school children. The theoretical part of the thesis deals with physical activity, effects of hypokinesia and mental hygiene specificity of this age group in the context of physical and psychosocial. The research evaluates the results of data from pedometers and the results of the survey, to which were used questionnaires "Time Picture of the Day"(Mužík, Bártová, 2010) and a questionnaire of daily regimen (Řehulka, 1987). This is a quantitative research. There were processed 104 questionnaires that were filled by children from 4th and 5th grades at selected elementary schools in Strakonice. The results show the differences in the amount of physical activity on school and weekend days, total amount of physical activity is satisfactory and further show the connection between a length of sleep and fatigability during the day.