scholarly journals Pilots’ Performance and Workload Assessment: Transition from Analogue to Glass-Cockpit

2020 ◽  
Vol 10 (15) ◽  
pp. 5211
Author(s):  
Vladimir Socha ◽  
Lubos Socha ◽  
Lenka Hanakova ◽  
Viktor Valenta ◽  
Stanislav Kusmirek ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Working Conditions ◽  
Statistical Significance ◽  
Flight Training ◽  
Flight Data ◽  
Professional Career ◽  
Training Groups ◽  
Workplace Conditions ◽  
Glass Cockpit

During their professional career, pilots often experience a change in workplace conditions in the form of an aircraft cockpit ergonomics change. Change of working conditions may impact their perception of flight data or the pilot’s psychophysiological condition, especially in cases of inexperienced pilots. The presented study deals with the influence of cockpit ergonomics change on the performance and pilot workload during a training course. We divided 20 subjects with no previous practical flying experience into two training groups (Gr. A and Gr. B). The flight training was focused on acquisition of basic piloting skills where both groups experienced cockpit ergonomics change in different training phases. The performance (piloting precision) was assessed based on deviations from predetermined parameters of the monitored flight manoeuvres. Heart rate variability qualified the extent of workload. The study showed the influence of the cockpit arrangement on piloting precision, where the transition to other type of cockpit ergonomics did not influence pilots’ subjective workload with statistical significance.

scholarly journals Heart rate variability—study in futsal athletes

2021 ◽  
Vol 31 (Supplement_2) ◽  
Author(s):  
Joaquim Pereira ◽  
Ana Santos ◽  
Telmo Pereira
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Nervous System ◽  
Parasympathetic Nervous System ◽  
Statistical Significance ◽  
Non Invasive ◽  
Record Heart Rate ◽  
Physiological Adaptations ◽  
Resting Heart Rate Variability ◽  
Electrocardiogram Ecg

Abstract Background The practice of high perfomance sports leads to alterations of the autonomic nervous system (ANS). The study of heart rate variability (HRV) resorting to the electrocardiogram (ECG) is a practical, efficient and non invasive tool that allows the monitorization of the cardiac-autonomic function in high perfomance athletes, exposing the physiological adaptations to repeated and intense physical exercise. To evaluate the resting heart rate variability of futsal players resorting to the electrocardiogram during the pre-season and competitive season. Methods The sample used in this study was composed of fifteen male futsal athletes, subjected to a resting electrocardiogram in supine position with the duration of 6 minutes, at two different moments. Results From the first to the second record heart rate variability, it was observed a significant decrease in heart rate from 66.53 ± 10.39 bpm to 61.50 ± 11.14 bpm (P < 0.05) and the indexes related to the activity of the parasympathetic nervous system (PNS), RMSSD, pNN50, HFnu did not present statistical significance (P > 0.05) despite the verified increased of absolute values from the first to the second evaluation. Conclusions We were able to observe a decrease in heart rate (HR), as well as, a tendency for elevated parasympathetic indexes and a vagal predominance from the first to the second moment of evaluation. The monitorization of heart rate variability can be useful to identify adaptations to competitive loads and, thus, planning adequate training loads for each athlete, avoiding the occurrence of lesions and fatigue and allowing an improvement in performance.

scholarly journals ANALYSIS OF THE CORRELATIONS OF THE HEART RATE VARIABILITY AND TURBULENCE PARAMETERS IN PATIENTS WITH ARTERIAL HYPERTENSION II DEGREE

2016 ◽  
pp. 58-64
Author(s):  
T. V. Aleynikova
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Ejection Fraction ◽  
Arterial Hypertension ◽  
Left Ventricular Mass ◽  
Left Ventricular Mass Index ◽  
Statistical Significance ◽  
Left Ventricular ◽  
High Level ◽  
Turbulence Parameters

Objective: to analyze the correlations of the parameters of heart rate variability (HRV) and heart rate turbulence (HRT) in patients with arterial hypertension of the II-nd degree. Material and methods. We have studied the parameters of heart rate variability and turbulence in 214 persons with arterial hypertension of the II-nd degree, of them 80.8 % having ventricular arrhythmias according to the Holter monitoring. We have analyzed the correlations of the parameters with the patient’s age, average heart rate (HR), circadian index (CI), left ventricular mass index (LVMI) and left ventricular ejection fraction (LVEF). The statistical analysis of the results has been made using the analytical package «Statistica» 10.0. Results. We have revealed statistically significant correlations of the HRV parameters with the age of patients, average HR, circadian index, ejection fraction. Thus, high level of the statistical significance of the interrelation of HRV parameters has been confirmed. We have received statistically significant correlations of the HRT parameters with the left ventricular mass index (LVMI), ejection fraction, HR average, quantity ventricular extrasystoles. High level of the statistical significance of the interrelation of HRT parameters (TO and TS) has been revealed. Conclusion. The received results can be used during the selection of the group of patients with arterial hypertension having high risk for unfavorable outcomes. Taking into account the features of the heart rate variability and turbulence parameters and factors associated with them this will enable the individualization of the assessment of the risk in arterial hypertension as much as possible and prescription of adequate treatment for each patient.

Heart rate variability in persons of Tajik nationality during adaptation

2021 ◽  
Vol 25 (4) ◽  
pp. 306-312
Author(s):  
Sarvar S. Raufov ◽  
Sergey N. Shilov
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Activity Index ◽  
Statistical Significance ◽  
Low Frequency ◽  
The Body ◽  
Regulatory Mechanisms ◽  
Regulatory Systems ◽  
Adaptive Capabilities ◽  
The Impact

Relevance . Maintaining the health of migrants while adapting to the new climatic and geographical conditions of residence is an urgent task. The impact of non-specific factors on the body of migrants in new climatogeographic conditions leads to the strain of regulatory and adaptive mechanisms, and in extreme cases to their failure. Objective - to determine the features of heart rate variability in young Tajiks, depending on the type of temperament living in Krasnoyarsk for more than a year. Materials and Methods: A study of heart rate variability in 63 Tajiks aged 18-40 years with different types of temperament, living in Krasnoyarsk for more than a year, was conducted. The types of temperament were determined by indices in accordance with the method of identifying VP-types of temperament according to E.Yu. Petrosyan, Yu. I. Savchenkov. The following indicators of heart rate variability (HRV) were evaluated: heart rate, the power of the high-frequency, low-frequency and very low-frequency spectrum (BV, MV-2, MV-1) of the HRV component, the voltage index of regulatory systems (IN), the centralization index (CI) and the activity index of regulatory systems. To assess the statistical significance of the differences between the samples, the Students criteria were used. Results and Discussion. It was revealed that migrants with an intense type of temperament after moving to a new place of residence increased the indicators of heart rate, BV and IN. At the same time, in the studied groups with a calm and adequate type of temperament, the power of BV was significantly reduced, with an increase in heart rate and CI. The conclusion is made about the influence of typological features of temperament on HRV indicators, when adapting to new climatogeographic living conditions. Individuals with an adequate type of temperament demonstrate the normal functioning of the adaptive capabilities of the body. In individuals with the calm type, an increase in the tension of the regulatory mechanisms was revealed. Conclusion . Significant changes in HRV are demonstrated by migrants with an intense type of temperament, in particular, they are characterized by a high voltage of regulatory mechanisms.

Influence of violations of autonomic regulation on the development of occupational polyneuropathy of the upper extremities in Kuzbass miners

2020 ◽  
pp. 162-166 ◽  
Author(s):  
M. O. Gidayatova ◽  
A. N. Fleishman ◽  
A. V. Yamshchikova ◽  
I. D. Martynov
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Peripheral Nerve ◽  
Statistical Significance ◽  
Nerve Fibers ◽  
Coal Industry ◽  
Autonomic Regulation ◽  
Upper Extremities ◽  
Control Group ◽  
Active Coal

Introduction. Active coal mining in Kuzbass, with its unfavorable climatic and environmental conditions, necessitates the study of occupational diseases of workers in this industry. One of the most common occupationally caused diseases of miners is polyneuropathy of the upper extremities.The aim of the study is to assess the effect of autonomic disorders on the course of occupational upper limb polyneuropathy in workers of the Kuzbass coal industry using various methods of analyzing heart rate variability.Materials and methods. 52 employees of coal enterprises aged from 43 to 64 years with the established diagnosis of “polyneuropathy of the upper extremities” were examined. The control group consisted of 16 healthy volunteers of the same age, engaged mainly in mental or light physical labor. Electroneuromyography was performed to assess the degree of damage to peripheral nerve fibers. Spectral and nonlinear parameters of heart rate variability were used to determine the state of autonomic regulation. The Mann-Whitney criterion was used to assess the statistical significance of differences between the study groups.Results. 3 groups of patients with polyneuropathy were identified according to the severity of violations of impulse conduction in the peripheral nerves. In subjects with mild, initial disturbances of pulse conduction (n=8, 15.4%), a decrease in parasympathetic influence is determined, which is manifested by a statistically significant decrease in the power of high frequency oscillations of the heart rate variability spectrum. With moderate signs of polyneuropathy (28 cases, 53.9%), there is a shift in the autonomic balance towards sympathetic activation; a statistically significant increase in very low-frequency fluctuations in heart rate variability indicates an increase in the influence of suprasegmental autonomic centers. In subjects with gross violations of the peripheral nerve impulses (n=16, 30.7%), there is a decrease in the power of oscillations in all frequency ranges of heart rate variability.Conclusions. The obtained data confirm the influence of autonomic regulation on the course of occupational polyneuropathy.The authors declare no conflict of interests.

Synchronization analysis between heart rate variability and EEG activity before, during, and after epileptic seizure

2014 ◽  
Vol 59 (4) ◽  
Author(s):  
Diana Piper ◽  
Karin Schiecke ◽  
Lutz Leistritz ◽  
Britta Pester ◽  
Franz Benninger ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Statistical Significance ◽  
Low Frequency ◽  
Surrogate Data ◽  
Hemispheric Lateralization ◽  
Wavelet Coherence ◽  
Processing Scheme ◽  
Mode Synchronization ◽  
Band Activity

AbstractAn innovative concept for synchronization analysis between heart rate (HR) components and rhythms in EEG envelopes is represented; it applies time-variant analyses to heart rate variability (HRV) and EEG, and it was tested in children with temporal lobe epilepsy (TLE). After a removal of ocular and movement-related artifacts, EEG band activity was computed by means of the frequency-selective Hilbert transform providing envelopes of frequency bands. Synchronization between HRV and EEG envelopes was quantified by Morlet wavelet coherence. A surrogate data approach was adapted to test for statistical significance of time-variant coherences. Using this processing scheme, significant coherence values between a HRV low-frequency sub-band (0.08–0.12 Hz) and the EEG δ envelope (1.5–4 Hz) occurring both in the preictal and early postictal periods of a seizure can be shown. Investigations were performed for all electrodes at 20-s intervals and for selected electrode pairs (T3÷C3, T4÷C4) in a time-variant mode. Synchronization was more pronounced in the group of right hemispheric TLE patients than in the left hemispheric group. Such a group-specific augmentation of synchronization confirms the hypothesis of a right hemispheric lateralization of sympathetic cardiac control of the low-frequency HRV components.

scholarly journals Comparison of microalbuminuria and heart rate variability in prediction of cardiovascular complications in diabetic population: a pilot study

2017 ◽  
Vol 4 (3) ◽  
pp. 819
Author(s):  
K. Deepalakshmi ◽  
S. Vijayabaskaran ◽  
A. Murali
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Statistical Significance ◽  
Vascular Complications ◽  
Cardiovascular Complications ◽  
P Value ◽  
Diabetic Patients ◽  
Vagal Activity ◽  
Autonomic Imbalance ◽  
Increased Risk

Background: Microalbuminuria is considered as an early marker and strongly associated with risk of cardiovascular complications in diabetic patients. Autonomic imbalance due to micro vascular damage to parasympathetic and sympathetic fibers results in reduced heart rate variability; also predicts increased risk for cardiovascular events in diabetics. Hence it is necessary to identify an early and effective predictor of diabetic micro vascular complications. Objective of the study was to compare heart rate variability of controls with type 2 diabetes with and without microalbuminuria.Methods: This comparative study was conducted among individuals without diabetes, hypertension and dyslipidemia (controls) and Type II diabetics with and without microalbuminuria (cases). Cases and controls were subjected to general clinical examination; microalbuminuria and HbA1C were noted. heart rate variability was assessed using digital physiograph. Frequency (HF, LF, LF/HF ratio) domain readings were noted.Results: Mann Whitney U test was employed to analyze nonparametric data. Diabetics with microalbuminuria when compared with controls showed statistically significant (p-value=0.015) reduction in vagal activity. When compared with diabetics without microalbuminuria (180.4±151.7) they showed reduction in HF with no statistical significance. When diabetic group without microalbuminuria (0.56±0.31) was compared with controls they showed alternation in LF/HF ratio which has no statistical significance. Diabetics with microalbuminuria when compared with controls showed a statistically significant (p-value=0.009) alternation in LF /HF ratio implying an autonomic imbalance.Conclusions: This study shows there is significant vagal inhibition and autonomic imbalance in diabetic patients with microalbuminuria compared to controls. To ascertain the role of HRV as an early predictor of cardiovascular complications we propose to conduct study with a larger sample size in future.

scholarly journals PO-107 Applied Research on Heart Rate Variability in Monitoring Sports Fatigue of Boxing Athletes

2018 ◽  
Vol 1 (4) ◽  
Author(s):  
Jinhao Wang ◽  
Jun Qiu ◽  
Shuai Chen
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Blood Cell ◽  
Statistical Significance ◽  
Autonomic Nerves ◽  
Monday Morning ◽  
Heavy Load ◽  
Before And After ◽  
Physiological And Biochemical Indexes ◽  
Physiological And Biochemical

Objective Based on the diagnosis of sports fatigue using physiological and biochemical indicators, to detect the changes of heart rate variability (HRV) index before and after heavy load training in boxing athletes, and observe the effect of heavy load training on cardiac autonomic nerves. The purpose of this study was to investigate the application of HRV to monitor boxing athletes’ sports fatigue. Methods 16 athletes from Shanghai men's boxing team were recruited. The coach organized a 4-week heavy load training, on Monday morning before and after heavy load training, to evaluate whether athletes have exercise fatigue by testing white blood cell (WBC), red blood cell (RBC), hemoglobin (Hb), blood testosterone (T), cortisol (C), testosterone/cortisol ratio (T/C), creatine kinase (CK), blood urea (BU) and morning pulse. Heart rate variability (HRV) indicators were detected simultaneously. The data were analyzed by SPSS 19.0 statistical software. Pearson correlation analysis was used to compare the correlation between HRV and physiological and biochemical indexes. The paired sample T test was used to compare the differences between the indicators, P<0.05, P<0.01 was statistically significant. Results After heavy load training, when compared with indexes before heavy load training, T and T/C ratios decreased significantly (-38%, -52.7%, p<0.01), C and morning pulse increased significantly (+32.4%, +20.4%, p<0.05), BU and CK had an increasing trend but no statistical significance (+16.5%, +52.7%, p>0.05), while WBC, RBC and Hb showed no statistical significance (p>0.05), these changes in physiological and biochemical indexes can diagnose sports fatigue of boxing athletes after heavy load training. SDNN of HRV index was significantly correlated with morning pulse (p<0.05), RMSSD was significantly correlated with CK (p<0.05), LF was significantly correlated with Hb (p<0.05), and LF/HF was significantly correlated with T, C, T/C, morning pulse, CK (p<0.05). After heavy load training, LF and LF/HF of HRV index in boxing athletes were significantly increased than that before heavy load training (1744.7±1526.3 ms2 vs. 1134.5±1003.3 ms2, 2.5±1.3 vs. 1.6±1.0, p<0.05), the other HRV indexes showed no statistical significance (p>0.05). Conclusions The LF and LF/HF changed significantly when boxing athletes appeared sports fatigue, suggesting that the sympathetic nervous system had enhanced activity and increased tension, the imbalance between Sympathetic and parasympathetic tend to predominate in sympathetic activity. LF and LF/HF are sensitive HRV indicators for monitoring sports fatigue in boxing athletes.

scholarly journals Exercise and Heart Rate Variability in Cancer Patients: A Systematic Review

2019 ◽  
Vol 12 (4) ◽  
pp. 64-75
Author(s):  
Vahid Farajivafa ◽  
Nasim Khosravi ◽  
Mahdieh Molanouri Shamsi ◽  
Hamid Agha-Alinejad
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Exercise Training ◽  
Cancer Patients ◽  
English Language ◽  
Exercise Intervention ◽  
Statistical Significance ◽  
Exercise Interventions ◽  
General Survival ◽  
The Time Domain

Introduction: Heart rate variability (HRV) is negatively associated with mortality. Decrease in HRV is common in cancer patients. The association between HRV and general survival in cancer patients has made HRV a valuable biomarker for evaluation of the disease prognosis. Exercise is considered an interventional strategy to improve various outcomes in cancer patients. The present paper provides a descriptive review of the literature regarding the effect of exercise interventions on HRV in cancer patients. Methods: A systematic search was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guidelines in PubMed and Google Scholar, from inception since 1950 till October 15, 2018. The terms exercise, training, cancer, neoplasms, heart rate variability, and HRV were used in the search. Eligible studies were those trials using structured exercise intervention and having untrained adult cancer patients. Only English-language papers were included in the review. Results: Eight studies were included in the review. Of the various HRV parameters, 2 in the time domain (SDNN and RMSSD) and 3 in the frequency domain (LF, HF, and LF/HF) were commonly reported in the studies. Exercise intervention increased SDNN, RMSSD, and HF in all the studies, although the difference did not reach statistical significance in some cases. The results regarding LF and LF/HF were not consistent. Conclusion: In general, exercise intervention can improve HRV in cancer patients. It is suggested that SDNN, RMSSD, and HF parameters be used in the evaluation of exercise effects on HRV because these parameters a) have prognostic value and b) more suitably reflect the effects of exercise training in these patients.

scholarly journals A study of short term heart rate variability in dipping tobacco users

2014 ◽  
Vol 5 (3) ◽  
pp. 91-94 ◽  
Author(s):  
M.I.Glad Mohesh ◽  
K Ratchagan ◽  
A Sundaramurthy
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Smokeless Tobacco ◽  
Autonomic Function ◽  
Statistical Significance ◽  
Medical Science ◽  
Short Term ◽  
Cardiovascular Autonomic Function ◽  
Hrv Analysis

Background: WHO (2010) reported the rise in the number of smokeless tobacco users in India. Dipping tobacco is a form of smokeless tobacco being used in these region in various trade names. Nicotine in smoking tobacco is found to alter the cardiovascular autonomic functions. As the expected cardiovascular mortality due to tobacco use across the globe is very high, here we studied the effect of dipping tobacco on cardiovascular autonomic function using the short term heart rate variability (HRV) analysis. Methods: Five minutes Lead II ECG at rest is aquired from male dipping tobacco moderate users (n=30) and age matched controls (n=30). Frequency and time domain parameters were derived and analysed using the Kubios HRV analysis software. Blood pressure changes were also compared. Unpaired ‘t’ test was done using SPSS 17.0 and statistical significance was set at p<0.05. Results: Significant changes in certain parameters indicated that there is a developing set back in the sympathetic control over the heart (LF, 383.8+115.8, 952.8+131.1, p<0.01) and also an established increase in diastolic blood pressure (73.1+2.8, 65.48+1.5, p<0.01). Conclusion: Dipping tobacco a form of smokeless tobacco is equally harmful like any smoked tobacco in altering the cardiovascular autonomic function. Thereby the increase in smokeless tobacco users in India or any country is going to add up more to the mortality rate due to tobacco related diseases in near future as estimated by WHO. An immediate measure to stop the production, sale and use of these smokeless tobacco products could curb this menace. Asian Journal of Medical Science, Volume-5(3) 2014: 91-94 http://dx.doi.org/10.3126/ajms.v5i3.9588

scholarly journals Autonomic dysfunction characterized by Heart Rate Variability among patients with Sepsis-related Acute Respiratory Failure

2021 ◽  
Author(s):  
Preethi Krishnan ◽  
Curtis Marshall ◽  
Philip Yang ◽  
Sivasubramanium V Bhavani ◽  
Andre Holder ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Respiratory Failure ◽  
Acute Respiratory Failure ◽  
Time Domain ◽  
Statistical Significance ◽  
Low Frequency ◽  
Multiscale Entropy ◽  
Physiological Data ◽  
Fluctuation Analysis

Abstract Rationale: To explore the association and implications of using Heart rate variability (HRV) derived from continuous bedside monitoring as a surrogate for detection of Acute Respiratory Failure (ARF) in critically ill sepsis patients. Objective: To analyze HRV measures derived from continuous physiological data captured before ARF-onset to determine whether statistically significant markers can be characterized when compared to sepsis controls. Methods: Retrospective HRV analysis of sepsis patients admitted to Emory Healthcare ICUs was performed between ARF and age and gender-matched controls. HRV measures such as time domain, frequency domain, nonlinear, and complexity measures were analyzed up to 1 hour before the onset of ARF, and a random event time in the sepsis-controls. Statistical significance was computed by the Wilcoxon Rank Sum test. Results: A total of 89 intensive care unit (ICU) patients with sepsis were included in this retrospective cohort study. Time-domain HRV measures including pNN50 (the fraction of consecutive NN intervals that differ by more than 50 ms), RMSSD (root-mean-square differences of successive NN intervals), standard deviation, interquartile range, variance, and approximate entropy for Beat-to-Beat intervals strongly distinguished ARF patients from the controls group. HRV measures for nonlinear and frequency domains were significantly altered (p<0.05) among sepsis patients with ARF compared to controls. Frequency measures such as low frequency (LF), very low frequency (VLF), high frequency (HF), and SD1/SD2 ratio nonlinear measure (SD1:SD2) also showed a significant (p<0.05) increase in the ARF group patients. Multiscale entropy complexity was lower for ARF patients compared to the control counterparts. Detrended fluctuation analysis (DFA) showed a decreasing trend in ARF patients. Conclusions: HRV was significantly impaired across sepsis patients who developed ARF when compared to sepsis controls, indicating a potential prognostic utility for earlier identification of the need for mechanical ventilation and management of patients suspected with sepsis.

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