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Methods for the evaluation of heart rate and arterial blood pressure variability
Sedláčková, Gabriela ; Halámek, Josef (referee) ; Leinveber, Pavel (advisor)
The bachelor thesis deals with methods for description of heart rate variability and arterial blood pressure. An important mechanism for maintaining homoeostasis in the body is so called baroreflex feedback loop, which allows for a short-term regulation of blood pressure. The thesis contains description of methods which are currently used for baroreflex sensitivity evaluation. Analysis in time domain as well as in frequency domain was done using programs in Matlab environment. At the end of the thesis the influence of ventricular extrasystoles on output parameter is evaluated.
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Suppression of the responsive component of electrodermal activity
Vraný, Jakub ; Vičar, Tomáš (referee) ; Kolářová, Jana (advisor)
Electrodermal acitivity is a kind of electrochemical signal generated with relation to activity of the autonomic nervous system that stimulates the sweat glands. In this way, is it possible to measure the activity of the sympathetic part of the nerve systém and evaluate the cognitive stress of the treated person, which is manifested by responsive signals in EDA record, respectively to increased occurence of responses. The aim of this work is to design a deep learning algorithm for the identification of this component in the record of data taken from UBMI database. The recordings contain a sequence of measurements the conductance of the skin of patient, who was subjected alternately to the states of rest and subsequently a state of mental stress. The data were annotated according to presence of the responsive components occuring in the records of EDA. Subsequently, a suitable deep learning algorithm was implemented in order to classify the responsive components in the measured EDA signal. The neural network model has been taught, optimized and implemented on the measurement samples using annotated data. The obtained results data were statistically evaluated to qualify the success of the classification of responsive components and differences in the records of mental calm and stress. The results of the classification and comparison of EDA records measured at different conditions of the patient were discussed subsequently.
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Influence of autonomic nervous system in the inducibility of atrial fibrillation.
Šrutová, Martina ; Provazník, Ivo (referee) ; Kolářová, Jana (advisor)
Cílem této práce je zjištění změn předcházejícím fibrilaci síní. Pozorována je rovnováha mezi sympatikem a parasympatikem. Do experimentu výzkumného ústavu Cleavlendské kliniky bylo zapojeno šest psů různých ras. Signály EKG byly získány Holterovským 24hodinovým monitorováním. Pomocí 40 vysokofrekvenčních impulsů (TI) byla každých 30 minut vyvolávána AF. Z 24hodinového signálu byly extrahovány kratší epizody. Každá z těchto epizod obsahovala 10 minut předcházejících TI a 3 minuty následující po TI. Desetiminutové epizody byly zpracovány automaticky, byly detekovány QRS komplexy a RR intervaly a vypočteny HRV parametry. Přítomnost a délka trvání AF byly zjištěny manuálně z tříminutových intervalů následujících po TI. Byla-li vyvolána AF o délce trvání kratší než 30 sekund došlo ve srovnání s epizodami bez výskytu AF k významným změnám tří HRV parametrů. HF parametr poklesl pro epizody s výskytem AF. LF parametr byl naopak vyšší v epizodách s AF. Pro AF delší než 30 sekund nebyly významné změny pozorovány. Změny v epizodách s krátkou AF mohly být způsobeny změnami vlivu sympatiku a parasympatiku. Ke vzniku dlouhých AF je pravděpodobně zapotřebí i jiného vlivu, který nemusí nutně souviset s nervovým systémem. K dalším analýzám je zapotřebí většího množství signálů.
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The Verification of the Use of the Heart Rate Variability in the Management of Training Process in Adolescent Mountain Bikers
KADLEC, Jakub
Cross-country Olympic (XCO) is one of the endurance sports. The training process of mountain bikers is very demanding because the rider must be complex in endurance and anaerobic skills. Alfa and omega of the training process is a periodization of training load and recovery. Heart rate variability (HRV) can help us assess body's condition and readiness for training. In the practical part of the work, an experiment was carried out, which was attended by eight adolescent mountain bikers. The intervention took place during the training camp. The total intervention time was four weeks. The participants were randomized into two groups. The first experimental group (ES) (n = 4) was a graduated training camp with a heart rate variability guided training load. The second group was a control group that used a classical predefined training plan. For evaluation of HRV training efficiency a VO2max test and 20 minutes time trial (20TT) on an ergometer were used. The results showed an improvement in mean power output during 20TT in the experimental group (PRE 303.5 W; POST 317.5 W) and relative values (PRE 4.58 W.kg-1; POST 4.68 W.kg-1). On the other hand, there were no changes in average power (PRE 308 W; POST 305.7 W) and relative values (PRE 4.20 W.kg-1; POST 4.20 W.kg-1). From a statistical point of view, there was no effect of HRV training on performance indicators (p <0.05). Our experiment failed to confirm the usefulness of HRV training for cyclists.
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The verification of usability of the heart rate variability in the training process for cyclists
KADLEC, Jakub
Alternation of intensity and rest in the right proportion is crucial for the development of sports performance. The correct timing of the practice can be simplified by monitoring heart rate variability. The aim of the thesis is to verify connection between the current readiness to give a sport performance and HRV. The verification had been performed using HRV monitoring and stress tests. The stress tests were undertaken in Functional Load Diagnostic Laboratory belonging to the Department of Sport Studies at the University of South Bohemia. The experiment had been running for two months. The participants of the experiment were two cyclists of XC category. One of the limiting factors of the experiment is the number of participants. The statistical significance of values was gained by comparing spirometry and spectral analysis of heart rate variability results. Correlation of values of sympathetic nervous system stimulation and minute ventilation can be considered as statistically important. Connections of only one of two experiment participants were statistically important for the thesis. The first of the probands showed 32 statistically important correlations out of 140. The second of the probands showed 11 statistically important correlations out of 140. More statistically significant correlations have been proven in cyclist with higher level of performance. The connection between the level of performance and the HRV, the importance of which is particularly in determining the level of compensation, has been confirmed at least to some extent.
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Suppression of the responsive component of electrodermal activity
Vraný, Jakub ; Vičar, Tomáš (referee) ; Kolářová, Jana (advisor)
Electrodermal acitivity is a kind of electrochemical signal generated with relation to activity of the autonomic nervous system that stimulates the sweat glands. In this way, is it possible to measure the activity of the sympathetic part of the nerve systém and evaluate the cognitive stress of the treated person, which is manifested by responsive signals in EDA record, respectively to increased occurence of responses. The aim of this work is to design a deep learning algorithm for the identification of this component in the record of data taken from UBMI database. The recordings contain a sequence of measurements the conductance of the skin of patient, who was subjected alternately to the states of rest and subsequently a state of mental stress. The data were annotated according to presence of the responsive components occuring in the records of EDA. Subsequently, a suitable deep learning algorithm was implemented in order to classify the responsive components in the measured EDA signal. The neural network model has been taught, optimized and implemented on the measurement samples using annotated data. The obtained results data were statistically evaluated to qualify the success of the classification of responsive components and differences in the records of mental calm and stress. The results of the classification and comparison of EDA records measured at different conditions of the patient were discussed subsequently.
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The reflective effect of manipulative therapy on blood pressure.
Martínek, Josef ; Bitnar, Petr (advisor) ; Slabý, Kryštof (referee)
The topic of the thesis is The reflective effect of manipulative therapy on blood pressure. The aim of the thesis is to summarize current knowledge, which talk about the relationship between the ma-nipulative therapy and the changes of blood pressure. One of the purpose of the thesis is to clarify the using of manipulative therapy in the treatment of arterial hypertension. In the thesis another methods of manipulative therapy are discussed to give broad overwiev and to have a posibble to comparison. Powered by TCPDF (www.tcpdf.org)
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Distant effects of muscle electrostimulation
Koláček, Michal ; Slabý, Kryštof (advisor) ; Demeková, Júlia (referee)
This work is trying to identify possible non-stimulatory effects and distant effects of muscle electrostimulation musculus quadriceps femoris based on a literature search. Furthermore evaluates the influence of High Tone Electrical Stimulation (HTEMS) muscles of lower limbs on the activity of the autonomic nervous system, expressed by heart rate variability, a spectral power in the individual frequency bands. Randomized crossover study involved 15 healthy subjects (7 men and 8 women), average age 24.4 ± 2,5 years. Heart rate variability was evaluated in two situations: the situation without the application HTEMS and the situation with the aplication of HTEMS. Electrostimulation was done with HITOP 191. The results did not show statistically significant differences in all monitored components. The study also dealt with the reproducibility of measurements of perception and motor threshold for HTEMS.
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Autonomic nervous system and its relationship to functional disorders of the muscle
Marčišová, Hana ; Čech, Zdeněk (advisor) ; Slabý, Kryštof (referee)
The aim of this paper was to summarize the current knowledge of function and regulation of autonomic nervous system (ANS). We wanted to assess possible involvement of ANS in changes of muscle tension. Sympathetic nervous system affects the sensitivity of somatosenzory afferention, thus effecting the function of whole nervous system. Exists evidence about ANS effect on cutaneous afferents activity as well as muscle spindle afferent activity. Sympathetic modulation of proprioceptive information from muscle spindles may influence α motoneuron excitability. ANS may affect muscle tonus regulation. The selective activation of trigger point (TRP) during heightened muscle sympathetic efferent activity (MSNA) was proved. This supports the idea that the sympathetic nervous system can directly contribute on maintaining of the TRP and myofascial pain syndrome. Powered by TCPDF (www.tcpdf.org)
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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...
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