|
|
Spherical rollers procees inovation by application of cold bulk forming
Machač, Stanislav ; Kopřiva, Miloslav (referee) ; Samek, Radko (advisor)
MACHAČ Stanislav: Spherical rollers process innovation by applicaton of cold bulk forming. Diploma thesis of the attendance engineer´s studies, Institute of technology, 2nd year, 2nd level – summer term, study group 5O / 51, school year 2007 / 2008. FSI VUT Brno, department of forming and plastics, May 2008, 75 pages, 6 tables, 4 enclosures. The topic of this thesis is production innovation of spherical rollers for bearings. The innovation is based on the technology of cold bulk forming. According to the literary research and according to the current stage of production is proposed and conceived manufacturing process for cold upsetting instead of turning using in current spherical rollers production. This manufacturing process is dedicated for the bearing type 22226EJ. The production process is conceived with regard to determinate knuckle-joint press LLR 1000 (Smeral Brno, a.s.). Also with regard to determinate half-closed die upsetting and with regard to formability of the steel 100CrMn6. The proposal and check-up of tool functional parts are designed regarding the current setting of particular parts of the press. In the next part of this thesis the proposal of work-room layout dedicated for hand-filling of semi-factured product is conceived. In conclusion the comparison of spherical roller production budget between cold upsetting and turning is conceived.
|
|
|
Enthesis and Enthesopathy
Ševčík, Vladislav ; Katolický, Jakub (advisor) ; Machač, Stanislav (referee)
Background: Enthesopathies affect entheses, highly specialized connetive tissue, connecting tendon to bone. Enthesis and adjacent structures form a functional unit. It is prone to degenerative and inflammatory tissue damage caused by enthesis overuse or diffuse inflammatory disease. Methods: First task is to compose a current narrative review concerning enthesopathies with emphasis on disease etiology and efficacious therapies without focusing on a specific pathology. Thorough description of enthesis and its functions is included. Second task is to complete one detailed case study of a patient suffering from enthesopathy affecting a medial epicondyle of humerus. Results: A narrative review has been completed attempting to offer a more comprehensive perspective on entheses and related pathologies. One patient has been selected and treated for pathology of a medial epikondyle of humerus. Namely eccentric contraction exercises, radial pressure wave modality, and motion patterns modification were used to affect the lesion. The patient has improved rapidly and significantly. Conclusions: Not enough up-to-date information about ethesopathies and respective treatment options is available in Czech publications. There are still some inefficient therapies being currently used, and there is a lack of...
|
|
|
Fall risk assessment in the senior population.
Kovařčíková, Iveta ; Machač, Stanislav (advisor) ; Demeková, Júlia (referee)
The bachelor thesis focuses on a pilot assessment of selected tests for the prediction of fall risk in the elderly. The theoretical part deals with falls and their risk factors, the possibilities of assessing the risk of falls by means of functional tests and instrumental methods, as well as the possibilities of fall prevention. A total of 81 seniors (mean age 78.5±8.5 years) were included in the actual study, 78 of whom completed the entire follow-up. All probands completed The Timed Up and Go (TUG) test and subsequent gait and standing stability measurements via Oculus' Meta Quest 2 virtual reality (VR) headset using piloted apps designed by VR Medical. Incidence of falls was collected by telephone and email correspondence over the following 6 months. There was no statistically or substantively significant difference in the duration of the TUG test between the control group and the group of probands who suffered a fall during the follow-up period (12.9±6.9 vs. 11.5±5.0 s; p=0.99; Cohen's d=0.02). The probands in the control group who did not suffer a fall showed a higher step cycle time variability compared to the probands who suffered a fall (SD=0.54±0.40 vs. 0.38±0.55 s). However, the difference between the groups with and without a fall in step cycle variability was far from statistically...
|
|
|
Application of virtual reality in upper limb therapy in patients after a stroke
Hnátková, Marie ; Machač, Stanislav (advisor) ; Šembera, Martin (referee)
The theoretical part of the thesis deals with stroke from the medical and physiotherapeutic point of view with respect to movement deficit of the paretic upper limb. Specifically, the diagnosis of the disease, therapy and incidence including risk factors are mentioned. The practical part deals with 7 case reports of patients who underwent rehabilitation using virtual reality 2-3 times a week over the course of 8 weeks. The aim of these case studies is to determine the influence and evaluate the effectiveness of virtual reality therapy on functional deficit of the upper limb in different patients after stroke. The purpose is also to monitor practical aspects of therapy of specific patients after stroke, which will be taken into account in cooperation with the developers for future improvement of rehabilitation systems using VR. The Frenchay arm test, the modified Frenchay scale and the Visual Assessment Score of the Hand Functional Task are used to objectify the function of the upper limb. The evaluation is complemented by the quality of life questionnaires EQ-5D-3L and Short Form-36. The measurement further evaluates the momentum of the paretic upper limb, in particular the joint extent and the rate of spasticity using the modified Ashworth scale. All examinations are performed both at the initial...
|
|
|
Effect of physical exercise on ultrasonographic assessment of Achilles tendon region in runners
Benešová, Adéla ; Machač, Stanislav (advisor) ; Novák, Jakub (referee)
The master thesis entitled "The effect of physical activity on the ultrasonographic evaluation of the Achilles tendon in runners" aims to elucidate the role of physical activi-ty on the outcome of ultrasonographic (USG) examinations. Thirty-two runners un-derwent a 10km run preceded by a USG examination to evaluate and measure their Achilles tendon (AT). These findings were compared with the results of an identical USG examination acquired after the run. Statistical analysis showed significantly diffe-rent values for the following parameters: cross section area (CSA), m. flexor hallucis longus (m. FHL) diameter and heel fat pat compresibility (HFP). Subjectively assessed retrocalcaneal bursa size also showed differences in dimensions. Another focus of the study was to compare the client-centric state of the AT assessed by the VISA-A questi-onnaire with the CSA values and the size of the musculotendinous junction (MTJ) angle of the m. soleus. The size of CSA was inversely correlated with VISA-A values. MTJ angle and VISA-A did not show a statistically significant association.
|
|
|
Activation of abdominal wall and back muscles during exercise with traction and compression loads
Jordáková, Adela ; Čech, Zdeněk (advisor) ; Machač, Stanislav (referee)
We used RUSI (rehabilitative ultrasound imaging) for measurement of abdominal and back muscle in different loading modes. Methods: We used diagnostic ultrasonography imaging for taking linear measurement of trunk muscles. We measured anterioposterior (AP) dimensions of lateral abdominal wall muscles- m. OE, m.OI, m.TrA and cross-section area (CSA) of lumbar m. multifidus. We compared two groups of sports-floorball players and sportsman using climbing and hanging (climbers, aerialists). We measured positions with compressive force (kneeling on all four with lifted knees) and with traction load (hang with upper limbs with flexion of lower limbs-with leg support and without). Study is made on 50 volunteers. Results: The pattern of thickness of abdominal muscles is same in all positions in both groups. The lowest is always AP thickness of m. TrA, wider is m. OE and the widest always m. OI. The resting thickness are in both groups almost in all cases the lowest. AP thickness in m. TrA in floorball players is only exception, there is lowest in hang without legs support. In all other case sis resting position always lowest. For m. OE are results same for both climbers and floorball players-the lowest thickness is in hang with legs support (floorball players 0,84 cm, climbers 0,87), greater activationis...
|
|
|
The comparison of submaximal load on the bicacle ergometer, elliptical ergometer and arm crank
Novoveská, Gabriela ; Slabý, Kryštof (advisor) ; Machač, Stanislav (referee)
INTRODUCTION: This thesis is focused on comparison of submaximal load PWC 170 to three different types of cranks together with contrasting various methods of calculating this index. We have chosen one method from those four, which has seemed like having the least error and we have compared it against those three remaining ones. METHODOLOGY: It has been tested on 10 probands (5 men and 5 women) which were in age range from 20 to 29 years and without any serious health problems. Graded test without breaks has been chosen for stress protocol, where every proband started with stress 1 W/kg of his weight on bycycle and eliptical crank. We have used conversion factor 0,5 on arm crank, which means that the stress on this crank started on 0,5 W/kg. The load has been gradually increasing by 0,5 W/kg on each level (0.25 W/kg on arm crank). Every level of load has three minutes duration and number of levels used has been individual because it has been driven by increase of pulse rate. After the proband has reached at least 170 beats per minute we have been continuously increasing the stress till we have reached maximum. We have determined pulse frequency during the examination on the end of each level of stress and also when the maximum has been reached, as well as subjective evaluation of load intensity on a...
|
|
|
The Effects of Extracorporeal Shock Wave Therapy in Treatment of Achilles Tendinopathy
Katolický, Jakub ; Machač, Stanislav (advisor) ; Novák, Jakub (referee)
Diplomová práce Účinky rázové vlny v léčbě tendinopatie Achillovy šlachy 1 Abstract This thesis focuses on the observation of the effects of low-energetic focused extracorporeal shock wave therapy (ESWT) in the treatment of Achilles tendinopathy. The theoretical part summarizes the current knowledge of anatomical, histological, kinesiological and biomechanical aspects of Achilles tendon (AT), as well as pathological processes, which can be described as Achilles tendinopathy, their differential diagnosis and treatment options. Last but not least, we present up-to-date information on the physical principles and biological effects of ESWT, not only in the treatment of AT diseases. The main goal of our research was to determine the effectiveness of low-energetic focused ESWT in the treatment of Achilles tendinopathy in comparison to the placebo group. The subject of observation was not only changes in clinical manifestations, but also possible changes in the morphology of AT using ultrasonography (USG). Methods: A total of 20 patients with symptomatic Achilles tendinopathy was included in the study, while only 18 of them completed the entire program, and therefore only the results of these patients were evaluated. They were randomly divided into two groups in 1:1 ratio. Group A was treated by ESWT with...
|
|
|
The relationship between morphology of abdominal wall muscles and back pain in elite floorball players
Kramperová, Adéla ; Machač, Stanislav (advisor) ; Šembera, Martin (referee)
The diploma thesis evaluates the morphology of the abdominal wall muscles focusing on the assessment of lateral symmetry in elite female floorball players and its relationship with the occurrence of back pain in these players. The theoretical part of the thesis includes an overview of the physiological mechanisms of postural stabilization in comparison with deviations in patients with back pain and describes the principles of sonographic examination and its use in physiotherapy. The theoretical part is also focused on the imagining of the abdominal muscles and the summary of specific findings in floorball players and other athletes, with a predominant one-sided load related to the biomechanics of movement in these sports. Methodology: A total of 20 female players of the highest floorball competition in the Czech Republic participated in this research. The linear parameters of the abdominal muscles (m. RA, m. TrA, m. OI and m. OE) and the whole lateral abdominal muscles were measured in players on both sides at rest using sonography. The participants also filled in an electronic questionnaire evaluating back pain. Results: Significant lateral asymmetry of linear parameters of abdominal muscles was demonstrated in the work (p = 0,017; d = 0,52). The relationship between the lateral asymmetry and the...
|
|
|
Influence of cervical spinal cord lesion on cardiovascular fitness
Machač, Stanislav ; Kolář, Pavel (advisor) ; Vilikus, Zdeněk (referee) ; Nováková, Marie (referee)
Traumatic damage to the cervical spinal cord has a dramatic impact on determinants affecting cardiovascular fitness. In tetraplegia, in addition to diminished skeletal muscle function, impaired sympathetic cardiovascular innervation together with a dysfunction of catecholamine release is typically present. Individuals with tetraplegia are at a high risk of long-term inactivity, which increasingly contributes to the development of common civilization diseases. The aim of the current dissertation project is to investigate the cardiovascular fitness in males with cervical spinal cord injury (n=20) as compared to able- bodied males (n=27). Both groups completed exercise testing on an arm-crank ergometer. Arterial blood pressure response to exercise, peak oxygen consumption and peak heart rate were the primary outcome variables. In the first part of the study, a graded maximal arm- crank ergometer test to the subjective exhaustion was performed for the inter-group peak exercise comparison. The peak power dramatically differs between the groups and could be an important confounding factor limiting the evaluation of a physiologic response related to the equivalent physical loading. Therefore, in the second part of the study, individuals of the control group completed a second graded arm-crank ergometer...
|
guest ::
RSS feed.