National Repository of Grey Literature 248 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
EMG study: Nordic hamstring exercises vs. isometric training
Kudláček, Jiří ; Slabý, Kryštof (advisor) ; Pokorný, Jan (referee)
Bibliographical record: KUDLÁČEK, Jiří. EMG study: Nordic hamstring exercises vs. isometric training. Prague: Charles Univerzity, 2nd Faculty of Medicine, Department of Rehabilitation and Sports Medicine, 2020, 79p. Supervisor MUDr. Kryštof Slabý. Abstract This thesis is an EMG study, which examines an electric activity of knee flexors and m. quadriceps femoris during 3 types of exercises: Nordic hamstring exercise, single leg sliding leg curl, and isometric contraction. The theoretical part summarizes anatomy, physiology, and kinesiology of the musculoskeletal system, as well as the principle of surface EMG. In the experimental part, the EMG study was conducted on 20 healthy individuals aged 20 to 30 years-old. Each patient underwent an applied kinesiology procedure and subsequently went through an 16 channel surface EMG technique. The aim of this work is to compare the maximal and average value of the EMG amplitude of particular muscles during each exercise. While providing Nordic hamstring exercise and single leg slide, the light was shed on a question of whether there is a statistically significant difference between activation of m. biceps femoris and m. semitendinosus in terms of EMG values. The following phase of the thesis scrutinized the timing of hamstring muscles during Nordic hamstring...
Kinematic analysis of running in children aged 6 to 8 years
Hrachovcová, Monika ; Slabý, Kryštof (advisor) ; Pokorný, Jan (referee)
This diploma thesis deals with the biomechanics of running and the kinematic analysis of running in children aged 6 - 8 years. The paper consists of two parts. The first part deals with the biomechanics of running and its development, running injuries and describes the kinematic analysis of running. The PubMed, the ScienceDirect Database and sources of the National Medical Library and of the Charles University were searched for creating this theoretical part. The second part describes the experiment - methods and its results. 70 children were recorded during overground running at spontaneous speed. The obtained video recording was measured using the Kinovea 0.8.12. program. The video was scrolled through frames and three moments of the stance phase (initial contact, midstance and moment toe-off) were detected. At these moments selected angles in the sagittal plane were analyzed. These angles were described in the terms of descriptive statistics. Certain characteristics subdivided the cohort into two groups. These were compared in kinematic parameters to determine statistically significant differences. The obtained values from the experiment are discussed and compared with the the values from the recent literature dealing with kinematics of running. At last the suggestions for further research are...
Preventive examination of sportsmen in Czech republic and comparison of physical parameters occuring in different disciplines
Vrbík, Michal ; Slabý, Kryštof (advisor) ; Pokorný, Jan (referee)
The aim of this work is to document the content and extent of preventive checkups of sportsmen in Czech republic. The content of obligatory checkups will be examined upon its impact on preventing serious injuries of the movement apparatus as well as diseases of circulatory system and other internal systems. I am going to describe typical abnormalities of myosceletal apparatus which may increase the possibility of acquairing acute or overuse injury. Consecutinely an exemplary phenotype of a sportsmen will be presented. I chose fotball and I will describe the typicall aberrations which potentionally lead to trauma of the movements apparatus including typical injuries. The work will also contain a case report of examination of footballer. I will then compare the findings with the typical phenotype of footballist described in literature.
System of Motivation in the Company
Pokorný, Jan ; Konečný, Štěpán (referee) ; Putnová, Anna (advisor)
The diploma thesis deals the analysis current incentive system in society and the subsequent proposal for its improvement. First part is theoretical basic for the problematic of motivation. In the theoretical part are explained the basic concepts associated with motivation of employees and we will focus on human resource management too. The next section analyses the current situation in selected company. On the basic of the analysis I will develop proposals that will increase the motivations of the employees.
Mechanical design of impact simulator under reduced gravity
Melichar, Marek ; Pokorný, Jan (referee) ; Návrat, Tomáš (advisor)
The diploma thesis is focused on the development of the concept of a mechanical device that would meet the necessary requirements to achieve a successful simulation of reduced gravity or microgravity on the tested body at its impact. The choice of a suitable mechanism is based on a literary research of all available variants and highlight of their specifics. Target values are created for the selected method of testing, upon reaching which the concept will be considered successful. In order to verify the functionality of the concept, a mechanism is assembled on a smaller scale. The individual components of the mechanism are tested and carefully selected. All essential physical processes taking place in the system are mathematically described and combined into a MATLAB script. A separate application is created to calculate the behavior of the system based on the specified input parameters.
Analysis of the influence of different weld geometry model on fatigue strength of a weld
Holeta, Aleš ; Pokorný, Jan (referee) ; Vosynek, Petr (advisor)
The work was focus on the analysis of the fatigue life of a simple welded joint. The main goal of this work was to compare different methods of evaluation of welded joints and different methods of creating a geometry of computational models. Calculations were per-formed analytically and numerically. The numerical solution was performed using FEM. The problem was analysed in the open-source program Salome Meca and in the commercial pro-gram ANSYS Workbench.
Simulation of fluid flow around obstacles by Lattice Boltzmann Method
Prinz, František ; Pokorný, Jan (referee) ; Zatočilová, Jitka (advisor)
The task of this diploma thesis is the Lattice Boltzmann method (LBM). LBM is a mesoscopic method describing the particle motion in a fluid by the Boltzmann equation, where the distribution function is involved. The Chapman-Enskog expansion shows the connection with the macroscopic Navier-Stokes equations of conservation laws. In this process the Hermite polynoms are used. The Lattice Boltzmann equation is derived by the discretisation of velocity, space and time which is concluding to the numerical algorithm. This algorithm is applied at two problems of fluid flow: the two-dimensional square cavity and a flow arround obstacles. In both cases were the results of velocities compared to results calculated by finite volume method (FVM). The relative errors are in order of multiple 1 %.
The influence of different types of ventilation outlets on the heat transfer by convection from the human body
Zábovský, Ján ; Pokorný, Jan (referee) ; Fišer, Jan (advisor)
The aim of this diploma thesis is to investigate the influence of different types of HVAC system outlets on convective heat transfer from a human body. The first part of the thesis consists of an overview of essentials important for understanding the issue, specifically, metabolism, thermoregulation, heat transfer mechanisms, thermal vote and fluid dynamics. The second part defines the main working hypothesis and describes the used experimental approach leading either to confirmation or disproval of the hypothesis. The chosen approach is based on a measurement with thermal mannequin “Newton” using two different configurations: constant surface temperature and constant generated heat flux. In case of the first configuration, the convection intensity indicator was the value of heat flux generated from each of surface segments of the thermal mannequin. Their surface temperature was the indicator when running the experiment using the second configuration. The value was evaluated by the thermal mannequin as well as the thermal camera Flir i7 which provided more detailed division of the surface. The final part of the thesis describes the progress of the experiment itself, represents gathered values involving analysis of contaminants and confirms or disproves the original thesis.
Manipulator in the line for heating logs
Vítek, Jan ; Pokorný, Jan (referee) ; Pokorný, Přemysl (advisor)
This thesis concerns with construction design of manipulator. The purpose of the manipulator is to transport beech logs. It is a part of the production line for heating and steaming veneering of the logs before their subsequent processing. This thesis presents a new design solution. It offers detailed descriptions of the purpose of the construction and of individual functional assemblies. It also describes the means for operating the machine and the types of sensors used. Calculation of forces and reactions in the mechanism, based on a simplified load calculation model, constitutes an important part of the work. Design of key components of the machine is then based on the results of the analysis of the forces involved. The supplements of the thesis include photographs of the manipulator realization and selected technical design.

National Repository of Grey Literature : 248 records found   1 - 10nextend  jump to record:
See also: similar author names
10 Pokorny, Josef
2 Pokorný, J.
13 Pokorný, Jakub
82 Pokorný, Jan
10 Pokorný, Jaroslav
1 Pokorný, Jindřich
3 Pokorný, Jindřich,
37 Pokorný, Jiří
10 Pokorný, Josef
2 Pokorný, Josef,
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