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Heart rate variability (HRV) analysis in radio and TV broadcasting stations workers

100%
Bortkiewicz A., Gadzicka E., Szymczak W., Zmyślony M.
International Journal of Occupational Medicine and Environmental Health
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2012
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vol. 25
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issue 4
446-455
EN
Objectives: The aim of the study was to assess the mechanism of cardiovascular impairments in workers exposed to UHF-VHF radio frequency electromagnetic fi elds (EMF). Materials and Methods: Heart rate variability (HRV) was analysed using 512 normal heart beats registered at rest. The analysis concerned time-domain (STD R-R) and frequencydomain (VLF, LF, HF) parameters of HRV. Fifty nine workers (group I) with low-level and 12 workers (group II) with highlevel exposure were examined. The mean age of the subjects was 47±9 years and 41±14 years, and mean exposure duration 19.1±8.8 years and 13±4 years, in groups I and II, respectively. The groups were divided according to: $\text{E}_\text{max}$, $\text{E}_\text{dose}$, $\text{E}_\text{mean}$ for frequencies UHF, VHF and UHF+VHF: The control group consisted of 42 non-exposed subjects, aged 49±8 years. Statistical analysis comprised one-way analysis of variance, covariance analysis and logistic regression models. Results: In the exposed groups, the heart rate was higher than in the control one. Standard deviation of R-R intervals (STD R-R) was found to be signifi cantly (p = 0.0285) lower in group I (42.5±24.7 ms) compared to the control group (62.9±53.5 ms). The risk of lowered STD R-R was signifi cantly increased (OR = 2.37, p = 0.023) in group II. Both exposed groups presented signifi cantly higher VLF and LF values than the control group (p = 0.005 and p = 0.0025, respectively). The EMF-exposed groups were characterised by the dominance of the sympathetic system (LF/HF 1.3±0.35). Conclusions: The results indicate that exposure to radiofrequency EMF may affect the neurovegetative regulation.
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Heart rate variability (HRV) and muscular system activity (EMG) in cases of crash threat during simulated driving of a passenger car

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Zużewicz K., Roman-Liu D., Konarska M., Bartuzi P., Matusiak K., Korczak D., Lozia Z., Guzek M.
International Journal of Occupational Medicine and Environmental Health
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2013
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vol. 26
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issue 5
710-723
EN
Objectives: The aim of the study was to verify whether simultaneous responses from the muscular and circulatory system occur in the driver's body under simulated conditions of a crash threat. Materials and Methods: The study was carried out in a passenger car driving simulator. The crash was included in the driving test scenario developed in an urban setting. In the group of 22 young male subjects, two physiological signals - ECG and EMG were continuously recorded. The length of the RR interval in the ECG signal was assessed. A HRV analysis was performed in the time and frequency domains for 1-minute record segments at rest (seated position), during undisturbed driving as well as during and several minutes after the crash. For the left and right side muscles: m. trapezius (TR) and m. flexor digitorum superficialis (FDS), the EMG signal amplitude was determined. The percentage of maximal voluntary contraction (MVC) was compared during driving and during the crash. Results: As for the ECG signal, it was found that in most of the drivers changes occurred in the parameter values reflecting HRV in the time domain. Significant changes were noted in the mean length of RR intervals (mRR). As for the EMG signal, the changes in the amplitude concerned the signal recorded from the FDS muscle. The changes in ECG and EMG were simultaneous in half of the cases. Conclusion: Such parameters as mRR (ECG signal) and FDS-L amplitude (EMG signal) were the responses to accident risk. Under simulated conditions, responses from the circulatory and musculoskeletal systems are not always simultaneous. The results indicate that a more complete driver's response to a crash in road traffic is obtained based on parallel recording of two physiological signals (ECG and EMG).
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ФІЗИЧНА ПРАЦЕЗДАТНІСТЬ СТУДЕНТІВ, ЩО ЗАЙМАЮТЬСЯ В ГРУПІ СПОРТИВНО-ПЕДАГОГІЧНОГО УДОСКОНАЛЕННЯ З БОКСУ

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Приймак С.
Педагогічні науки: теорія, історія, інноваційні технології
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2017
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issue 6(70)
131-143
EN
The purpose of the article was to determine the functional state of the cardiorespiratory system and the vegetative regulation of the heart rhythm of male students engaged in the sports-pedagogical perfection groups on boxing when performing the dose-related physical exertion. To implement the goal, the following research methods were used: photoplethysmography, heart rate variability (HRV), cardiointervalography, spirography, tonometry, veloergometry, methods of mathematical statistics. Thus, with comparatively the same relative values of the results of the PWC170 sample, the boxer students of all weight categories, the sympathetic regulation of cardiovascular activity is dominant, which indicates the same tropic support for performing physical exertion. During the restitution period, there is a decrease in the frequency-volume parameters of the respiratory system, to a greater extent, due to the frequency of the respiratory cycles. The centralization index (according to R. M. Baievskyi) remains unrefined in comparison with the results of the sample, while maintaining a tendency to dominate the “heavyweights” of sympathicotonia balance. In this case, the ratio of low-wave to high-wave components of HRV (LF) indicates the dominance of sympathetic regulation of cardiovascular activity of boxer students of all weight categories. It is typical that students-boxers of heavy weight categories have a fairly low overall absolute level of regulatory systems activity, the LF/HF ratio is in the low-wave range, which indicates a low adaptation of the regulation of cardiac activity of boxer heavy students to submaximal load. Since the PWC170 sample is performed mainly in submaximal mode, which is characteristic for lightweight boxers and is non-specific for heavyweights, it is logical that the under-recovery of the trophic (oxygen) function in boxing students in heavy categories is due to the low functionality of the organism to the glycolytic regime of power supply.
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Heart rate variability as an indicator adaptation reserves cardiovascular system

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Kovata A., Senko V., Shishko
Puls Uczelni
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2014
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issue 4
4-8
EN
Background: The efectiveness of the vegetative regulation action might be controlled by the method of heart rate variability (HRV), which has been very popularly used over the last 10 years worldwide. The analysis of many clinical studies indicates that the severity of the disease might be controlled using the method of HRV. Material and methods: All the experimental and controlled group participants, which consisted of healthy students with none sports experience, underwent the examination according to the 5-minute standard protocol of HRV. In addition, all the examinees performed a bicycle stress test. After the bicycle stress test, some additional tests of HRV were also carried out. Results: It was found that some signifcant diferences, between the group of sportsmen and the group of patients, exist. The parasympathetic activity of LF is maximum in athletes and tends to decrease in patients with cardiovascular pathologies. The decreases of the activity of the vasomotor centre was noticed in both study groups. The sympathetic system activity was the lowest in athletes. Conclusions: At the high depression of the vegetative regulation, any signifcant load (physical or psycho-emotional) indicates cardiovascular instability which remains beyond the capacity of adaptation. The higher the variability, the more stable the CVS is to the external loads. A sharp decrease of the variability, such as the heart vegetative innervations, causes deteriorating quality of the regulatory mechanisms and, as a result, the risk of cardiovascular diseases increases.
PL
Wstęp: Skuteczność działania wegetatywnej regulacji może być kontrolowana przy pomocy oceny zmienności rytmu serca (HRV). Metoda ta przez ostatnie 10 lat zyskała popularność na całym świecie. Analiza licznych obserwacji klinicznych wskazuje, że nasilenie choroby można kontrolować przy użyciu HRV. Materiał i metody: Wśród wszystkich uczestników badania zarówno z grupy eksperymentalnej, jak i kontrolnej (zdrowi studenci bez dużych obciążeń sportowych) w spoczynku przeprowadzono badanie według standardowego protokołu 5-minutowego HRV. Dodatkowo wszyscy badani wykonali próbę ergometryczną (protokół standardowy i stochastyczny). 5-10 minut po wysiłku przeprowadzono dodatkowe testy HRV. Wyniki: Ustalono, że istnieją znaczne różnice pomiędzy grupą kontrolna a grupą pacjentów z chorobami serca. Zanotowana aktywność działania układu przywspółczulnego była maksymalna u przedstawicieli grupy kontrolnej i zmniejszyła się u pacjentów z patologią sercowo-naczyniową. Stwierdzono zmniejszenie aktywności ośrodka naczynioruchowego we wszystkich grupach badanych. Aktywność działania układu współczulnego u sportowców była najniższa. Wnioski: Przy obniżeniu wegetatywnej regulacji każde znaczące obciążenie (fzyczne, psycho-emocjonalne) wskazuje na strefę niestabilności sercowo-naczyniowej, co jest poza możliwością adaptacji. Większa zmienność rytmu – to wskaźnik stabilnej pracy serca przy obciążeniach zewnętrznych. Gwałtowny spadek zmienności rytmu, tj. „autonomiczne unerwienie serca”, to wskaźnik pogarszającej się jakości mechanizmów regulacyjnych, w wyniku czego zwiększa się ryzyko chorób ser- cowo-naczyniowych.
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Cardiovascular changes in workers exposed to fine particulate dust

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Bortkiewicz A., Gadzicka E., Stroszejn-Mrowca G., Szyjkowska A., Szymczak W., Koszada-Włodarczyk W., Szadkowska-Stańczyk I.
International Journal of Occupational Medicine and Environmental Health
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2014
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vol. 27
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issue 1
78-92
EN
Objectives: Epidemiological studies provide evidence that airborne particulate matter may contribute to the increased incidence and mortality rates due to pulmonary and cardiovascular diseases. Only some of them address the problem of occupational exposure to particulate air pollution. The aim of our study was to assess cardiovascular reaction and autonomic regulation in workers exposed to fine particles. Materials and Methods: All workers had medical examination, resting ECG with heart rate variability analysis (HRV), 24-h ECG, and ambulatory blood pressure monitoring (ABPM) performed. The subjects were 20 male workers (mean age: 32.14.0 year) of a ceramic ware factory exposed to the dust and 20 workers who were not exposed (mean age: 39.4±7.8 year). The period of employment under exposure amounted to 5.6±2.1 year. Dust exposure was measured using individual dosimeters. Results: The geometric mean total dust concentration was 44±1.5 mg/m³ and the FPD (fine particulate dust) concentration amounted to 11.5±1.6 mg/m³. No abnormalities were noted in the resting ECG in both groups, in 24-h ECG 2 subjects, both from exposed and control groups, had ventricular heart rhythm and repolarization disturbances. Blood pressure in ABPM, both systolic as well as diastolic, was normal and did not differ between the groups. Resting heart rate in the exposed group was significantly lower (p = 0.038) than in the control group. In the exposed group STD R-R from short-term records was significantly higher (p = 0.01). Fast Fourier Transform (FFT) analysis showed that the low frequency power spectrum (LF) did not differ in the exposed and the control group, while high frequency (HF) was significantly higher in the exposed group. LF/HF ratio was significantly lower in the exposed in comparison with the control group. Conclusions: Although we did not reveal significant abnormalities in ECG as well as in ABPM in the exposed group, it seems that neurovegetative disturbances (parasympathetic predominance) may serve as an early indicator of fine particulate dust effect on cardiovascular system.
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ВЛИЯНИЕ ОДИНАКОВОЙ НАПРАВЛЕННОСТИ ТРЕНИРОВОЧНОГО ПРОЦЕССА НА ФУНКЦИОНАЛЬНОЕ СОСТОЯНИЕ ТХЭКВОНДИСТОВ И БОКСЕРОВ

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Михалюк Є.
Педагогічні науки: теорія, історія, інноваційні технології
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2016
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issue 3(57)
212-222
EN
The aim of this study is to identify and to compare the integral indicators of cardiovascular, an autonomic nervous system and a physical performance between the taekwondo wrestlers and the boxers of high-class qualification. Materials and methods. The study involved 223 high-class sportsmen, training and competitive activity which is accompanied by beats to the head and practically does not differ. There are 96 taekwondo wrestlers among them (14 Masters of sports of international class (MSIC), 25 Masters of Sport (MS), 57 candidates of master of sports and athletes of the 1 level qualification (CMS-1 level) and 127 boxers (11 - MSIC, 26 – MS, 90 - CMS-1 level). The temporal and frequency parameters of heart rate variability (HRV) were studied. The central hemodynamics was studied by an automated tetrapolar rheography by W. Kubiček which is modified by Yu.T. Pushkar. The physical performance was determined by the conventional method, using a cycle ergometer, submaximal test PWC170. The index of the functional state (IFS) was calculated, using the formula, proposed and patented by the author. Conclusions. 1. The comparison parameters of HRV, central hemodynamics and PWC170/ kg showed that the taekwondo wrestlers of MSIC qualification in comparison with the similar qualifications of the boxers had the domination of parasympathetic autonomic nervous system (ANS), a significantly lower heart rate, while in both groups hypokinetic type of circulation (TC) dominated and no athletes with hyperkinetic TC; among PWC170/ kg and IFS there were no significant differences. 2. The comparison of the studied parameters among the sportsmen of MS qualifications showed the predominance of sympathetic influences of ANS of the taekwondo wrestlers, presence in both groups of sportsmen with hypokinetic TC and lack sportsmen with hyperkinetic TK, as well as the absence of significant differences among the PWC170/ kg and IFS compared to the boxers. 3. The taekwondo wrestlers and boxers of the CMS-1 level qualifications had the predominanceof a parasympathetic link of ANS, eukinetic TC, among the taekwondo wrestlers there are by 4 times more sportsmen with hyperkinetic TC and lack of significant differences among the PWC170/ kg and IFS. 4. The correlation analysis between the studied indicators showed the relationship according to which the taekwondo wrestlers of MSIC qualification increase PWC170/ kg and IFS accompanied by decrease of CI to economical hypokinetic TC. In qualifications of MS, CMS-1 level the taekwondo wrestlers and the boxers of qualifications of CMS-1 level had the decrease of influences of parasympathetic ANS accompanied with decrease of CI CI to economical hypokinetic TC. Perspectives future research is to study the influence of the same training loadings in a year cycle of training process on HRV, central hemodynamics and physical performance among the repsentatives of other sports.
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ФУНКЦІОНАЛЬНИЙ СТАН КАРДІОРЕСПІРАТОРНОЇ СИСТЕМИ СТУДЕНТІВ, ЩО СПЕЦІАЛІЗУЮТЬСЯ В БІАТЛОНІ В БАЗАЛЬНИХ УМОВАХ

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Приймак С.
Педагогічні науки: теорія, історія, інноваційні технології
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2017
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issue 9(73)
108-120
EN
In modern theory and practice of physical education and sports, sports pedagogy, one of the main areas of training future specialists is to ensure proper management of sports and pedagogical improvement on the basis of objectivization of knowledge about the structure of activity and functional state of the organism. The purpose of the article was to study the functional state of the cardiovascular system of students specializing in biathlon. Methods.Analysis, synthesis, comparison, classification, specification, synthesis of scientific sources on the research problem; study of pedagogical experience, normative legal acts to clarify the essence of the basic concepts of research; pulsometry, tonometry, photoplethysmography, spirography, methods of mathematical statistics. Results. Biathlon students with a relative equilibrium of regulation (eutonium) of cardiovascular activity have a certain tendency to para-, sympathetic dominance, depending on gender. The patterns of the relationship between HRV and pulse wave parameters in women have a lower level of probable significance (p≤0.05), which indicates a relatively lower influence of the para-, sympathetic components of regulation of the tone of peripheral vessels. Conclusion.The revealed patterns indicate the dominance of men in the aerobic component of the functional provision of activities, unlike women, in which this tendency is manifested to a lesser extent, which, in turn, determines the propensity to a greater humoral (ergotropic) and sympathetic regulation of cardiovascular activity. Further research is aimed at determining the functional state of cardioghemodynamics and the autonomic regulation of cardiac rhythm of students specializing in biathlon, depending on the personality’s temporal peculiarities. Taking into account the above-mentioned regularities of functional support of the activity will allow teachers, trainers, and specialists in physical culture to optimize the process of sports and pedagogical training of students in biathlon, depending on gender.
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Heart rate variability in workers of various professions in contrasting seasons of the year

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Markov A., Solonin I., Bojko E.
International Journal of Occupational Medicine and Environmental Health
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2016
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vol. 29
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issue 5
793-800
EN
Objectives It is known that professional occupation affects the heart rate variability (HRV). However, most studies have not taken into account seasonal features of the HRV. The aim of this study has been to evaluate the HRV differences in winter and in summer in the case of the Ministry of the Russian Federation for Civil Defense, Emergencies and Elimination of Consequences of Natural Disasters (EMERCOM) workers and scientific workers from the Komi Science Center of the Ural Branch of the Russian Academy of Sciences. Material and Methods The short-term HRV was examined for 13 EMERCOM workers and 13 scientific workers. The data was collected in winter (December) and summer (July) for the same groups of workers. The time domain and frequency domain HRV analyses were performed. The EMERCOM workers had more contact with the external environment than the scientific workers. Results The two-way analysis of variance with repeated observations on a single factor has shown that “Season” and interaction of two factors “Season” and “Profession” significantly influenced the HRV among volunteers. The “Profession” factor did not influence the HRV parameters (except for the heart rate in winter, p = 0.042). Seasonal changes in the HRV parameters were not significant in the case of scientific workers. In contrast, the EMERCOM workers showed significantly decreased parameters of parasympathetic activity (the root-mean-square of successive differences in RR intervals, percentage of consecutive RR intervals differing by > 50 ms and the relative value high frequency power, p = 0.001, p = 0.014 and p = 0.009, respectively) and increased parameters of sympathetic activity (the stress index and ratio of low-frequency power to high-frequency power, p = 0.012 and p = 0.006, respectively) in winter as compared to summer. Conclusions The results of our study indicate that, unlike the scientific workers, the EMERCOM workers showed significant changes in the HRV in contrasting seasons (winter and summer). A season of a year should be considered when assessing the HRV among workers of various professions. Int J Occup Med Environ Health 2016;29(5):793–800
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Recovery of rescuers from a 24-h shift and its association with aerobic fitness

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Lyytikäinen K., Toivonen L., Hynynen E., Lindholm H., Kyröläinen H.
International Journal of Occupational Medicine and Environmental Health
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2017
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vol. 30
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issue 3
433-444
EN
Objectives Rescuers work in 24-h shifts and the demanding nature of the occupation requires adequate recovery between work shifts. The purpose of this study has been to find out what kind of changes in autonomic control may be seen during work shift and its recovery period in the case of rescuers. An additional interest has been to see if aerobic fitness is associated with recovery from work shifts. Material and Methods Fourteen male rescuers (aged 34±9 years old) volunteered to participate in the study. Heart rate variability (HRV) was recorded for 96 h to study stress and recovery, from the beginning of a 24-h work shift to the beginning of the next shift. Aerobic fitness assessment included maximal oxygen uptake (VO2max) estimation with a submaximal bicycle ergometer test. Salivary cortisol samples were collected 0 min, 15 min, and 30 min after awakening on the 3 resting days. Results Some HRV parameters showed enhanced autonomic control after the work shift. Stress percentage decreased from the working day to the 2nd rest day (p < 0.05). However, maximal oxygen uptake was not associated with enhanced parasympathetic cardiac control (p > 0.05). Cortisol awakening response was attenuated right after the work shift. Conclusions The HRV findings show that recovery after a long work shift takes several days. Thus, rescuers should pay attention to sufficient recovery before the next work shift, and an integrated model of perceived and physiological measurements could be beneficial to assess cardiovascular strain among rescuers with long work shifts. Int J Occup Med Environ Health 2017;30(3):433–444
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Prolonged job strain reduces time-domain heart rate variability on both working and resting days among cardiovascular-susceptible nurses

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Borchini R., Bertù L., Ferrario M. M., Veronesi G., Bonzini M., Dorso M., Cesana G.
International Journal of Occupational Medicine and Environmental Health
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2015
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vol. 28
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issue 1
42-51
EN
Introduction Modifications of hearth rate variability (HRV) constitute a marker of the autonomic nervous system (ANS) deregulation, a promising pathway linking job strain (JS) and cardiovascular diseases (CVD). The study objective is to assess whether exposures to recent and prolonged JS reduce time-domain HRV parameters on working days (WD) among CVD-susceptible nurses and whether the association also persists on resting days (RD). Material and methods 313 healthy nurses were investigated twice with one year interval to assess JS based on the demand-control and the effort-reward models. 36, 9 and 16 CVD-susceptible nurses were classified as low JS in both surveys (stable low strain – SLS), recent high JS (high JS at the second screening only-RHS) and prolonged high JS (high strain in both surveys-PHS), respectively. In 9, 7 and 10 of them, free from comorbidities/treatments interfering with HRV, two 24-h ECG recordings were performed on WD and RD. Differences in the time domain HRV metrics among JS categories were assessed using ANCOVA, adjusted for age and smoking. Results In the entire sample (mean age: 39 years, 83% females) the prevalence of high job strain was 38.7% in the second survey. SDNN (standard deviation of all normal RR intervals) on WD significantly declined among JS categories (p = 0.02), with geometric mean values of 169.1, 145.3 and 128.9 ms in SLS, RHS, PHS, respectively. In the PHS group, SDNN remained lower on RD as compared to the low strain subjects (142.4 vs. 171.1 ms, p = 0.02). Similar findings were found for the SDNN_Index, while SDANN (standard deviation of average RR intervals in all 5 min segments of registration) mean values reduced in the PHS group during WD only. Conclusions Our findings suggest that persistent JS lowers HRV time-domain parameters, supporting the hypothesis that the ANS disorders may play an intermediate role in the relationship between work stress and CVD.
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Analysis of the relationship between emotion intensity and electrophysiology parameters during a voice examination of opera singers

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Krasnodębska P., Szkiełkowska A., Pollak A., Romaniszyn-Kania P., Bugdol M. N., Bugdol M., Mitas A. W.
International Journal of Occupational Medicine and Environmental Health
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2024
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vol. 37
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issue 1
84-97
EN
Objectives Emotions and stress affect voice production. There are only a few reports in the literature on how changes in the autonomic nervous system affect voice production. The aim of this study was to examine emotions and measure stress reactions during a voice examination procedure, particularly changes in the muscles surrounding the larynx. Material and Methods The study material included 50 healthy volunteers (26 voice workers – opera singers, 24 control subjects), all without vocal complaints. All subjects had good voice quality in a perceptual assessment. The research procedure consisted of 4 parts: an ear, nose, and throat (ENT)‑phoniatric examination, surface electromyography, recording physiological indicators (heart rate and skin resistance) using a wearable wristband, and a psychological profile based on questionnaires. Results The results of the study demonstrated that there was a relationship between positive and negative emotions and stress reactions related to the voice examination procedure, as well as to the tone of the vocal tract muscles. There were significant correlations between measures describing the intensity of experienced emotions and vocal tract muscle maximum amplitude of the cricothyroid (CT) and sternocleidomastoid (SCM) muscles during phonation and non-phonation tasks. Subjects experiencing eustress (favorable stress response) had increased amplitude of submandibular and CT at rest and phonation. Subjects with high levels of negative emotions, revealed positive correlations with SCMmax during the glissando. The perception of positive and negative emotions caused different responses not only in the vocal tract but also in the vegetative system. Correlations were found between emotions and physiological parameters, most markedly in heart rate variability. A higher incidence of extreme emotions was observed in the professional group. Conclusions The activity of the vocal tract muscles depends on the type and intensity of the emotions and stress reactions. The perception of positive and negative emotions causes different responses in the vegetative system and the vocal tract.
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Cardiovascular system parameters in participants of Arctic expeditions

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Pankova N. B., Alchinova I. B., Cherepov A. B., Yakovenko E. N., Karganov M. Y.
International Journal of Occupational Medicine and Environmental Health
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2020
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vol. 33
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issue 6
819-828
EN
ObjectivesA method of continuous heart rate (HR) and blood pressure (BP) recording was used for the evaluation of the cardiovascular system parameters in participants of short-term (<1 month) high-latitude expeditions, in comparison with the parameters of residents of Central Russia and the Arctic region.Material and MethodsA dynamic examination of participants of Arctic expeditions (30 men, residents of middle-latitude regions, aged 46.7±1.7 years), workers permanently living in Central Russia (the Moscow region, 44 men, aged 46.7±1.0 years) and residents of the North (the Murmansk region, 35 men, aged 46.6±1.3 years) was performed. The authors used a spiroartheriocardiorythmograph allowing the parallel recording of HR, BP, spectral characteristics of HR variability (HRV) and the variability of systolic BP (sBP) and diastolic BP (dBP), cardiac performance parameters, and spontaneous baroreflex sensitivity (BRS). The parameters were recorded at rest, in a sitting position, over 2 min.ResultsThe basic clinical parameters (HR, BP and cardiac performance) did not differ in the workers living in different climatic zones. However, the residents of the North demonstrated a lower total power (TP) of the dBP variability spectrum and a lower relative power of the high-frequency (HF) range in both the sBP and dBP variability spectra. The participants of expeditions to the North had a lower TP of the HRV spectrum (in comparison with both control groups) that did not change during the expeditions; BRS was reduced, while the TP of the sBP spectrum was increased in comparison with the corresponding parameters obtained from the residents of circumpolar regions, and decreased during the expedition in parallel with a decrease in the sBP values. The TP of both the sBP and dBP variability spectra, as well as the power of the HF range in these spectra, were similar in the participants of expeditions to those obtained from the residents of Central Russia, and they considerably surpassed the corresponding parameters in the northerners surveyed.ConclusionsThe revealed peculiarities of the cardiovascular system in the participants of high-latitude expeditions can be considered as correlates of positive, and adequate in terms of the physiological value, adaptive shifts in the autonomous regulation of the cardiovascular system.
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Measuring the effects of night-shift work on cardiac autonomic modulation: an appraisal of heart rate variability metrics

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Fink A. M.
International Journal of Occupational Medicine and Environmental Health
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2020
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vol. 33
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issue 4
409-425
EN
Night-shift workers may develop poor cardiovascular health. Studies about heart rate variability (HRV) metrics could identify risk factors in this population and be used to examine the effectiveness of interventions for optimizing the health of night-shift workers. The purpose of this review was to examine the use of HRV methodologies in studies about night-shift work. Overall, 34 articles met the selection criteria and underwent a methodological critique. The main conclusion across these studies was that night-shift work could increase the sympathetic influences on the variability between heartbeats. In many cases, however, important methodological details were omitted (e.g., the number and duration of electrocardiogram recordings, sampling rates, R–R segment duration, wavelet transform methods). Recommendations include adding measures of disease outcomes, using ≥250 Hz sampling rates and 600-s R–R segments, and measuring sleep and circadian rhythms. With these approaches, researchers can design investigations that identify therapeutic targets for improving the health of night-shift workers.
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Long-term monitoring of heart rate variability and state anxiety in allergic patients : comparison of four stress protocols

51%
Soláriková P., Brezina I., Turoňová D., Rajčáni J., Mlynčeková S.
Československá psychologie (Czechoslovak Psychology)
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2018
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vol. 62
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issue 3
258-271
EN
Introduction. Heart rate variability (HRV) represents one of the most used biomarkers of cardiovascular health that offers insight on autonomic nervous system (ANS) activation. This study deals with the issue of abnormal functioning of the ANS in allergic individuals who were monitored during three consecutive years. Methods. Our aim was to analyze the influence of various stress protocols on HRV parameters, which could be used as markers of ANS activity and on subjective perception of stress described by STAI-X1 (State-Trait Anxiety Inventory). Four different stress protocols are compared here: 1. Psychosocial stress (PSST), 2. Cognitive stress, 3. Measurements in natural conditions and 4. PSST group test (GPSST). This study compares outcome of the four protocols also with referential HRV measurement. Results and Discussion. The findings show that the stress tasks which featured a social component (PSST a GPSST) triggered a more intensive physiological response in comparison to cognitive stress or with natural conditions measurements. We recorded an interesting and significant finding related to allergy: allergic subjects showed a tendency towards decreased heart rate frequency (HR) and increased overall HRV in all tests. However, in case of subjectively perceived stress, no differences between groups were recorded. Besides, the functioning of the ANS showed also gender differences represented by an increased HR and a decreased HRV in women. Conclusion. Our results show increased HR and decreased HRV in stress conditions in all stress protocols. Our data support the prior findings of sympathetic withdrawal and/or parasympathetic hyperactivation in individuals suffering from allergy, which could be one form of the dysregulation of the ANS.
CS
Cíle. Tepová variabilita je jedním z nejužívanějších biomarkerů kardiovaskulárního zdraví, který nabízí vhled do aktivace autonomního nervového systému (ANS). Tato studie se zabývá problémem abnormálního fungování ANS u alergiků, kteří byli sledováni po dobu tří let. Metody. Cílem bylo analyzovat vliv různých stresových protokolů na parametry tepové variability, které by mohly být použity jako markery aktivity ANS, a na subjektivní vnímání stresu popsané pomocí STAI-X1 (State-Trait Anxiety Inventory). Byly srovnány čtyři různé stresové protokoly: 1. Psychosociální stres (PSST), 2. Kognitivní stres, 3. Měření v přirozených podmínkách a 4. Psychosociální skupinový test PSST (GPSST). Výsledky čtyř protokolů byly také srovnány s referenčním měřením variability tepové frekvence. Výsledky a diskuse. Nálezy ukázaly, že stresující úkoly, které obsahovaly sociální složku (PSST a GPSST), vyvolaly intenzívnější fyziologickou odpověď ve srovnání s kognitivním stresem nebo s měřením v přirozených podmínkách. Ve vztahu k alergii byly zjištěny zajímavé a významné nálezy: alergické osoby projevovaly ve všech testech tendenci ke snížené tepové frekvenci a celkově zvýšené variabilitě tepové frekvence. V případě subjektivně vnímaného stresu však nebyly zjištěny žádné rozdíly mezi skupinami. Fungování ANS ukázalo kromě toho také mezipohlavní rozdíly reprezentované zvýšenou tepovou frekvencí a sníženou variabilitou tepové frekvence u žen. Závěry. Výsledky ukázaly zvýšenou tepovou frekvenci a sníženou variabilitu tepové frekvence ve stresových podmínkách ve všech stresových protokolech. Získaná data podporují dřívější nálezy stažení sympatiku a/nebo parasympatické hyperaktivace u osob trpících alergií, což by mohlo být jednou z forem dysregulace ANS.
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