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Analysis of heart rate variability (HRV) during simulated operational stress in military personnel
Velda, Jan ; Maleček, Jan (advisor) ; Hráský, Pavel (referee)
Title: Analysis of Heart Rate Variability (HRV) During Simulated Operational Stress in Military Personnel. Goal: To analyze the effect of a three-day simulated operational stress on Heart Rate Variability (HRV) in individuals without the presence of sleep deprivation and caloric deficit. Methods: This bachelor's thesis combines empirical and theoretical approaches. The research sample included four students from the Military Department at the Faculty of Physical Education and Sport, Charles University (FTVS UK) in Prague, divided into control and experimental groups (two students in each group). All participants were physically fit and healthy individuals with an average age of 22.5 ± 1.91 years, an average height of 185.75 ± 4.19 cm, and an average weight of 89.5 ± 7.59 kg. Before the actual measurement, participants filled out the Pittsburgh Sleep Quality Index (PSQI), the Perceived Stress Scale (PSS10), and the Connor-Davidson Resilience Scale (CD RISC), and their baseline HRV values were measured. Then they underwent a three-day stress protocol of simulated military operational stress (SMOS), designed to simulate conditions that soldiers may encounter during combat deployment. This protocol included the "Tactical Mobility Test" (TMT) battery, consisting of seven tests: reaction speed, shooting,...
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Heart rate variability during walking in the forest and laboratory
Fantová, Michaela ; Baláš, Jiří (advisor) ; Hráský, Pavel (referee)
Title: Heart rate variability during walking in a forest environment and in a laboratory. Objectives: The aim of this study is to compare the variability of heart rate during walking in a forest and laboratory environment. Methods: In this study, heart rate was monitored using the Garmin HRM Dual chest strap during a 40minute walk in both natural and laboratory environments. The data were processed using Kubios software, enabling detailed analysis of heart rate variability (HRV). The research included HRV indicators such as RMSSD, SNS, and PNS indices, SD1 and SD2 indices, and a stress index, providing information on sympathetic and parasympathetic nervous system activity and overall stress levels. This methodology allows for the assessment of organism responses to various stimuli and stressful situations. Results: The average values were as follows: heart rate was 92.5 bpm in the forest and 79 bpm in the laboratory; RMSSD was 21.5 ms in the forest and 34 ms in the laboratory; SD1 was 29 % in the forest and 30 % in the laboratory; SD2 was 71 % in both environments; the stress index was 16.5 in the forest and 10 in the laboratory; the PNS index was -1.835 in the forest and -0.95 in the laboratory; the SNS index was 2.63 in the forest and 0.965 in the laboratory. Conclusion: Sympathetic nervous...
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Effects of natural environments on heart rate variability during walking
Polyák, Daniel ; Baláš, Jiří (advisor) ; Hráský, Pavel (referee)
Objectives: The aim of this thesis is to assess the effect of natural contrary to laboratory environment on heart rate variability during walking. Methods: Seven students from the Faculty of Physical Education and Sport of Charles University completed one visit in a natural and laboratory setting. Participants completed the Stroop test for 10 minutes. This was followed by walking for 40 minutes with active monitoring of heart rate variability using a sports watch and chest belt. Seven indicators of variability were assessed: heart rate, RMSSD (Root Mean Square of Successive Differences), Standard Deviation - SD1 and SD2, stress index, PNS index, SNS index. Data were analyzed in Kubios HRV software, processed, recorded in Excel and plotted in bar graphs. Results: Participant 1's average heart rate was 71 t/min in the laboratory, 87 t/min in the natural environment; Participant 2's was 87 t/min in the laboratory, 92 t/min in the natural environment. Participant 1's mean RMSSD was 53 milliseconds(ms) in the laboratory, 30 ms in the natural environment; Participant 2's was 15 ms in the laboratory, 11 ms in the natural environment. Participant 1's mean SD1 was 34 % in the lab, 31 % in the natural environment; Participant 2's was 25 % in the lab, 36 % in the natural environment. Participant 1's SD2...
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Analysis of heart rate variability (HRV) during the selection process for the COMMANDOS group
Zýka, Erik ; Maleček, Jan (advisor) ; Sovák, Libor (referee)
Title: Analysis of Heart Rate Variability (HRV) during the Selection Process for the COMMANDOS Group. Objectives: The aim of this study was to analyze changes in heart rate variability among individual participants during the selection process for the COMMANDOS group and to compare them with each other. Methods: This theoretical-empirical study focused on monitoring changes in heart rate variability (HRV) during the selection process for the COMMANDOS group, which lasted from Friday 2 PM until Sunday noon. The research sample consisted of 15 students physically and mentally demanding selection process led to the gradual dropout of participants, with only two completing the entire measurement. The initial measurement was taken on Friday at 14:00, and further measurements were taken at least twice a day, with intervals not exceeding 10 hours between measurements, totaling 7 measurements. Flexi Guard measuring systems, which allow long-term telemetric monitoring of health- physiological parameters in real time, were used for the measurement. Before the start of the selection process, participants completed a resilience questionnaire to assess their mental resilience. During the measurements, responses to the Pittsburgh Sleep Quality Index (PSQI), the Epworth Sleepiness Scale (ESS), the Perceived...
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Mobil system for monitoring of sports activity
Maleňák, Filip ; Čížek, Martin (referee) ; Rozman, Jiří (advisor)
The aim of this master’s thesis is to analyse methods that are used for monitoring athlete’s activities and a description of current technical solutions with a focus on heart rate and respiratory rate monitoring. The presented solution shows the possibilities of using available open source SW and HW technologies and their implementation in the design of an integrated tool for monitoring sports activities with the iOS operating system.
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Measurement and analysis of cardiovascular parameters
Filipová, Petra ; Smital, Lukáš (referee) ; Kratochvíla, Jiří (advisor)
This bachelor´s thesis illustrates the basic diagnostic procedures for ECG analysis in clinical practice. It contains the verification of statistical hypotheses, automatic detection of the RR intervals using three different QRS detectors and heart rate from the ECG und other analyses in time and frequency domain. The validation of detection efficiency is investigated. Heart rate variability analyses are shown in time and frequency domain too. Analyses are done in Matlab, the graphical interface in Maltab GUIDE was done too and includes all of the created functions in time and frequency domain. For the purpose of evaluation methods the real data were measured according to the created acquisition protocol.
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Scanning a analysing of heart electrical activity and blood pressure before and after the load
Vích, Daniel ; Kolářová, Jana (referee) ; Kratochvíla, Jiří (advisor)
The aim of bachelor’s thesis is familiarization with anatomy and physiology of heart, with setting to electrical activity, scanning EKG before and after the load with Biopac system, scanning of blood pressure before and after the load with auscultation, statistical analysis of acquired data and presentation of measured data in graphical interface Guide of Matlab system. According to the protocol of measurement, scanning of heart electrical activity with the Biopac system, and scanning of blood pressure, with auscultation, was realized before and after the load. Measured data was statistically analyzed with t-test to verify hypothesis, that there is an influence of the load on the watched parameters, and to show the process of statistical verification. Application of this method assumes normal distribution of data, that’s why data was at first tested by Chi-squared and Kolmogorov-Smirnov test to verify their normal distribution. In the next step data was imported into Matlab system. The presentation of measured data is realized in graphic interface Guide. The program contains time domain and spectral analysis, automatic detection of heart rate and analysis of heart rate variability.
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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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Relationship between breath and electrocardiogram
Hamerský, Jan ; Janoušek, Oto (referee) ; Kolářová, Jana (advisor)
The main goal of this thesis is to familiarize readers with the problem of influence on the cardiac cycle. Thesis analyzes necessary concepts to understand electrophysiology of heart, mechanisms affecting heart beats, respiratory identifides methods for detection of respiratory frequency presents in electrocardiogram, proposes own measurement protocol of the influence of respiratory rate on electrcardiogram, implements detection of respiratory rate of the measured records, compares the measured results
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