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Tytuł:
Multifractal detrended fluctuation analysis of heart rate variability
Autorzy:
Bębas, Ewelina
Kasperczuk, Anna
Oczeretko, Edward
Bossowski, Artur
Borowska, Marta
Powiązania:
https://bibliotekanauki.pl/chapters/2204804.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
fractal dimension
heart rate variability
ECG
diabetes
children
multifractal detrended fluctuation analysis
multifractal
Opis:
The analysis of heart rate variability can be used to predict cardiovascular state in diabetic children. Studies on HRV are mainly based on RR intervals of the ECG signal and include both linear indices and nonlinear characteristics. The current study aims at applying Multifractal Detrended Fluctuation Analysis to investigate signals of the heart rate variability (HRV) in 50 healthy children (group K), 27 patients suffering from diabetes type 1 without subsequent vascular complications (group A) and 35 patients suffering from diabetes type 1 with subsequent vascular complications (hypertension) (group B). Multifractal features were extracted to quantitatively compare signal complexity between the healthy group and the group of children with diabetes and diabetes with complications. The MFDFA analysis showed the multi-fractional nature of the signals in all groups. The characteristic MFDFA parameters were determined and subjected to statistical analysis. It showed differences in parameters h(1) and h(2) between the control group K and group A. This gives rise to the development of further research in an attempt to distinguish between these groups.
Źródło:
Advances in biomedical engineering; 109-122
9788367185400
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of Heart Rate Variability Fluctuations by Wavelet Transform
Autorzy:
Popov, A.
Karplyuk, Y.
Fesechko, V.
Powiązania:
https://bibliotekanauki.pl/articles/226306.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heart rate variability
HRV fluctuations
HRV wavelet analysis
time-dependent HRV estimation
wavelet transform
Opis:
Technique for separate estimation of fast and slow fluctuations in the heart rate signal is developed. The orthogonal dyadic wavelet transform is used to separate the slow heart rate changes in approximation part of decomposition and fast changes in detail parts. Experimental results using the recordings from persons practicing Chi meditation demonstrated the applicability of estimation heart rate fluctuations with the proposed approach.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 3; 395-400
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heart Rate Variability and Motion Sickness During Forklift Simulator Driving
Autorzy:
Zużewicz, K.
Saulewicz, A.
Konarska, M.
Kaczorowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/90661.pdf
Data publikacji:
2011
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
motion sickness
heart rate variability
spectral analysis
forklift truck virtual simulator
Opis:
The goal of the study was to determine the effect of a 1-h hour long forklift truck virtual simulator driving on the mechanism of autonomic heart rate (HR) regulation in operators. The participants were divided into 2 subgroups: subjects with no definite inclination to motion sickness (group A) and subjects with a definite inclination to motion sickness (group B). Holter monitoring of electrocardiogram (ECG) signal was carried out in all subjects during the virtual simulator driving. For 12 consecutive epochs of ECG signal, HR variability analysis was conducted in time and frequency domains. In subjects with a definite inclination to motion sickness after ~30 min of the driving, changes in parameter values were found indicating an increase in sympathetic and parasympathetic activity with parasympathetic dominance.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2011, 17, 4; 403-410
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heart rate variability based assessment of cognitive workload in smart operators
Autorzy:
Digiesi, Salvatore
Manghisi, Vito M.
Facchini, Francesco
Klose, Elisa M.
Foglia, Mario M.
Mummolo, Carlotta
Powiązania:
https://bibliotekanauki.pl/articles/406972.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
smart operators
cognitive load
NASA-TLX
heart rate variability
information theory model
Opis:
The study on cognitive workload is a field of research of high interest in the digital society. The implementation of ‘Industry 4.0’ paradigm asks the smart operators in the digital factory to accomplish more ‘cognitive-oriented’ than ‘physical-oriented’ tasks. The Authors propose an analytical model in the information theory framework to estimate the cognitive workload of operators. In the model, subjective and physiological measures are adopted to measure the work load. The former refers to NASA-TLX test expressing subjective perceived work load. The latter adopts Heart Rate Variability (HRV) of individuals as an objective indirect measure of the work load. Subjective and physiological measures have been obtained by experiments on a sample subjects. Subjects were asked to accomplish standardized tasks with different cognitive loads according to the ‘n-back’ test procedure defined in literature. Results obtained showed potentialities and limits of the analytical model proposed as well as of the experimental subjective and physiological measures adopted. Research findings pave the way for future developments.
Źródło:
Management and Production Engineering Review; 2020, 11, 3; 56-64
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heart Rate Variability in Exposure to High Altitude Hypoxia of Short Duration
Autorzy:
Zużewicz, K.
Biernat, B.
Kempa, G.
Kwarecki, K.
Powiązania:
https://bibliotekanauki.pl/articles/91083.pdf
Data publikacji:
1999
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
heart rate variability
hypoxic hypoxia
autonomic nervous system
zmienność rytmu serca
układ nerwowy
niedotlenienie
Opis:
The objective of the study is to attempt an evaluation of heart rate (HR) and heart rate variability (HRV) regulatory mechanisms in the presence of autonomous nervous system (ANS) components in transient exposure to high altitude hypoxia. During 24 hrs including a stay in hypobaria, the participants had their HR continuously recorded using the Holter method. The following parameters were calculated at rest and during the stay in a thermobarochamber: spectral power in low frequency bands (LF) 0.04-0.15 Hz and high frequency bands (HF) 0.15-0.5 Hz, and the sympathetic-parasympathetic balance index LF/HF. Under hypobaric conditions, a decrease in mean spectral power of R-R intervals was noted within both frequency ranges, compared with the study performed in normobaria. The observed differences were larger at daytime.
Źródło:
International Journal of Occupational Safety and Ergonomics; 1999, 5, 3; 337-346
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heart rate variability (HRV) analysis in radio and TV broadcasting stations workers
Autorzy:
Bortkiewicz, Alicja
Gadzicka, Elżbieta
Szymczak, Wiesław
Zmyślony, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2180072.pdf
Data publikacji:
2012-09-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
radio-frequency electromagnetic fields
heart rate variability
autonomic regulation
broadcasting stations workers
Opis:
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.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2012, 25, 4; 446-455
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wirtualny analizator krótkookresowej zmienności rytmu serca
Virtual analyzer of short-term heart rate variability
Autorzy:
Wilk, B.
Powiązania:
https://bibliotekanauki.pl/articles/155238.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
zmienność rytmu serca
analiza widmowa
transformata falkowa
heart rate variability
spectral analysis
wavelet transform
Opis:
W artykule zaprezentowano wirtualny analizator, który opracowano do badania zmienności rytmu serca w czasie krótkotrwałych testów stoowanych w diagnostyce autonomicznego układu nerowerego. Sygnał zmienności rytmu sercam tzw. sygnał HRV (ang. hear rate variability) jest wyznaczany za pomocą modelu stymulatora kardiologicznego (IPFM) na podstawie sygnału EKG. Wyniki analizy czasowo - częstotliwościowej sygnału HRV umożliwiają przeprowadzenie ilościowej oceny czynności układów współczulonego i przywspółczulonego. W pracy przedstawiono także przykładowe wyniki analizy oddechowej zmienności rutymu serca.
This paper describes virtual analyzer designed for heart rate varialility (HRV) analysis, which is performed via short duration tests used in diagnostics of autonomic neural system. The HRV signal is determined by the IPFM model, which uses ECG signal. Based on the results of HRV signal analysis in the time- frequency domain, a quantitative analysis of the parasympathetic and symphathetic activity may be performed. Several examples of the analysis of respiration effects on heart rate variability are discussed.
Źródło:
Pomiary Automatyka Kontrola; 2007, R. 53, nr 9 bis, 9 bis; 376-379
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heart rate variability in workers of various professions in contrasting seasons of the year
Autorzy:
Markov, Alexander
Solonin, Iuriy
Bojko, Evgeniy
Powiązania:
https://bibliotekanauki.pl/articles/2168343.pdf
Data publikacji:
2016-07-06
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
workers
heart rate variability
autonomic nervous function
environmental factors
working conditions
work environment
Opis:
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
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2016, 29, 5; 793-800
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of heart rate variability during head-up tilt-test in patients with vasovagal syncope
Autorzy:
Budrejko, Szymon
Kempa, Maciej
Chmielecka, Monika
Kozłowski, Dariusz
Raczak, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/895735.pdf
Data publikacji:
2018-09-28
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
tilt table test
syncope
vasovagal syncope
heart rate variability
Opis:
Introduction: Syncope is defined as transient loss of consciousness, due to decrease in brain perfusion. The most frequent mechanism is vasovagal syncope. In many patients, the cause of syncope remains unspecified, despite an extensive diagnostic work-up. Tilt-test (TT) is an acknowledged diagnostic tool for syncope. Currently, the so-called Italian protocol of TT is most widely used. Vasovagal syncope is caused by impaired circulatory regulation in response to orthostatic stress. One of the available tools to examine the influence of the nervous system on the circulation is the analysis of heart rate variability (HRV). Despite numerous publications concerning HRV parameters and autonomic regulation in patients with syncope, direct comparisons and metaanalysis of the results is impossible, due to variability of TT protocols and study group specifications. Aim of the study: As there is no uniform model of HRV during TT, we aimed to analyze HRV parameters during TT (performed according to the Italian protocol) in patients with vasovagal syncope, in order to determine the possible application of HRV measurements in clinical practice in that group of patients. Detailed objectives were: (1) analysis and comparison of HRV in patients with and without the history of syncope; (2) analysis of HRV changes in consecutive stages of TT; (3) identification of possible HRV differences between patients with positive and negative TT results. Materials and methods: Patients between 18 and 50 years of age were qualified for the study, if they had a history of at least 2 incidents of syncope or presyncope within the preceeding 6 months, and if signs and symptoms indicated the vasovagal mechanism. The study group included 150 patients: 100 consecutive patients with a postive TT result (POS), and 50 consecutive patients with a negative TT result (NEG). The control group (CG) comprised 50 volunteers with no history of syncope nor presyncope, matched according to age and sex to the study group. In all patients a TT was performed according to the Italian protocol, with paced breathing at a rate of 15/min. Time-domain (meanRR, SDNN, RMSSD, pNN50) and frequency-domain (abs_LF, abs_HF, rel_LF, rel_HF, norm_LF, norm_HF, LF/HF) HRV parameters were analyzed and compared at different stages of TT in the study groups as specified above. Results: 100 patients at the age of 18-44 years were included in the POS group, 50 patients at the age of 18-39 years in the NEG group, and 50 volunteers at the age of 20-39 in the CG. Volunteers in the control group developed unexpectedly high percentage of positive TT (14 patients). For consistency of analysis, the CG was thus subdivided according to the result of the TT into CG_POS (positive result of TT) – 14 patients, and CG_NEG (negative result of TT) – 36 patients. Based on HRV analaysis, no significant differences in HRV values were noted between patients with a history of syncope and positive or negative result of TT. Upright tilt resulted in HRV changes of the same direction and value in syncopal patients in the POS and NEG goup, as well as in patients in the CG_NEG group. Conclusion: HRV values and changes of those values at subsequent stages of TT were not different between syncopal patients with postive or negative TT result, or negative TT control group. The Italian protocol of TT may be associated with a surprisingly high percentage of false positive results.
Źródło:
European Journal of Translational and Clinical Medicine; 2018, 1, 1; 26-38
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the heart rate variability for women, specializing in race walking, throughout the menstrual cycle
Autorzy:
Kalytka, S.
Borovska, N.
Roda, O.
Karabuza, M.
Powiązania:
https://bibliotekanauki.pl/articles/2052359.pdf
Data publikacji:
2015
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
heart rate variability
spectral analysis
athletes
menstrual cycle
exercise
race walking
Opis:
The article presents the results of studies of the heart rate variability for women, specializing in race walking, at different phases of the menstrual cycle (MC). The results of spectral analysis of heart rate indicate that the first half of the MC is dominated by the contribution of MC HF component, and the second half is dominated by the contribution of the LF component and an ovulatory phase is dominated by the contribution of VLF component in the total power spectrum. According to the results of the geometric analysis, the increase of Mo in menstrual and postmenstrual phases of the MC, reduction of AMo – in postmenstrual, ovulatory phases indicates an increase in the HR functional state in these phases. Decrease of the HR functional state we noted in the premenstrual phase: Mo rates have dropped, and AMo – increased. IT indicators of regulatory systems have increased in postovulatory and premenstrual phases of the MC. In this regard, we have recommended the use of significant and strenuous exercise with the consideration of female athletes’ HR functional state in different phases of the MC.
Źródło:
Health Problems of Civilization; 2015, 09, 4; 5-10
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie wariancji Allana do badania zmienności rytmu serca
Application of Allan variance to research of heart rate variability
Autorzy:
Bołtrukiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/156038.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
zmienność rytmu serca
wariancja Allana
częstotliwość zatokowego rytmu serca
heart rate variability
modified Allan variance
frequency of heart rhythm
Opis:
Zmienność rytmu serca jest powszechnie występującym zjawiskiem fizjologicznym. Do jego parametryzacji wykorzystuje się typowe wielkości statystyczne, do których należy wartość średnia i odchylenie standardowe. W pracy zaproponowano wykorzystanie do jej oceny wariancji Allana, która jest użyteczna w ocenie jakości oscylatorów elektronicznych. Zaprezentowano adaptację metody obliczeniowej wariancji Allana, którą dostosowano do specyfiki badanego sygnału oraz wyniki uzyskane dla trzech 10-minutowych przebiegów akcji serca.
The heart rate variability - HRV, is a general physiological phenomenon. The analysis of HRV is a simple and noninvasive clinical examination of heart and autonomic nervous system. In the time domain the periods of electrocardiographic signal (ECG) or photoplethysmographic signal (PPG) are detected. Next, typical statistical parameters such as e.g. the average value, the standard deviation of these periods are calculated. The Allan variance is a recommended measure of instability of oscillators. The human heart is an oscillator too, so the Allan variance has been proposed to evaluate its rhythm variability. The procedure of calculation of the Allan variance has been modified, because the fundamental frequency of the heart rhythm is unknown. This modification is described by Eqs. 1 - 5, and shown in Fig. 1. In the experiments the PPG signal has been used. The histograms of the heart rhythm periods are presented in Fig. 2. The obtained values of the heart rhythm Allan variance are shown in Fig. 3. The obtained results enable identification of the kind of a noise component occurring in the heart rhythm.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 12, 12; 1486-1488
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring the effects of night-shift work on cardiac autonomic modulation: an appraisal of heart rate variability metrics
Autorzy:
Fink, Anne M.
Powiązania:
https://bibliotekanauki.pl/articles/2116589.pdf
Data publikacji:
2020-06-16
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
sleep
circadian rhythm
heart rate variability
sympathetic nervous system
night shift
parasympathetic nervous system
Opis:
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.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2020, 33, 4; 409-425
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perceived Mental Stress and Reactions in Heart Rate Variability—A Pilot Study Among Employees of an Electronics Company
Autorzy:
Orsila, R.
Virtanen, M.
Luukkaala, T.
Tarvainen, M.
Karjalainen, P.
Viik, J.
Savinainen, M.
Nygard, C. H.
Powiązania:
https://bibliotekanauki.pl/articles/90441.pdf
Data publikacji:
2008
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
work stress
wristop computer
heart rate variability
Opis:
In this study perceived mental stress during occupational work was compared to heart rate variability (HRV) using a traditional questionnaire and a novel wristop heart rate monitor with related software. The aim was to find HRV parameters useful for mental stress detection. We found the highest correlation between perceived mental stress with the differences between the values of triangular interpolation of rythm-to-rythm (RR) interval histogram (TINN) and the root mean square of differences of successive RR intervals (RMSSD) obtained in the morning and during the workday (r = –.73 and r = –.60, respectively). The analysis shows that as the RMSSD and TINN value differences increase from night to morning, the stress decreases.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2008, 14, 3; 275-283
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prolonged job strain reduces time-domain heart rate variability on both working and resting days among cardiovascular-susceptible nurses
Autorzy:
Borchini, Rossana
Bertù, Lorenza
Ferrario, Marco M.
Veronesi, Giovanni
Bonzini, Matteo
Dorso, Marco
Cesana, Giancarlo
Powiązania:
https://bibliotekanauki.pl/articles/2176995.pdf
Data publikacji:
2015-02-24
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
nurses
job strain
heart rate variability
HRV
time-domain parameters
ECG-monitoring
Opis:
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.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2015, 28, 1; 42-51
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resting heart rate variability and plasma noradrenaline level as a measurement of autonomic nervous system activity in mature, aging rats
Autorzy:
Dobrek, Łukasz
Kaszuba-Zwoińska, Jolanta
Baranowska, Agnieszka
Skowron, Beata
Thor, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/972585.pdf
Data publikacji:
2016
Wydawca:
Instytut Medycyny Wsi
Tematy:
autonomic nervous system
heart rate variability
aging
rat
Opis:
Introduction and objective. Aging is a process that also affects the autonomic nervous system (ANS) making it less adaptable to environmental and intrinsic stimuli and affecting its ability to maintain body homeostasis. The aim of this study was to estimate the resting ANS function using heart rate variability (HRV) method and by noradrenaline measurement in aging, 2–12-months-old rats. Materials and method. Resting 15-minute-long ECG recordings were performed in anaesthetized rats with a subsequent spectral HRV analysis. Basic non-normalized HRV components in the range of very low (VLF), low (LF) and high (HF) frequency, along with the total HRV spectrum power (TP) were estimated. Moreover, normalized LF (nLF) and normalized HF (nHF) were calculated. Blood samples were also collected to assay plasma noradrenaline (NA) level. Results. In the overall assessment, plasma noradrenaline level as well as both TP and all non-normalized HRV components demonstrated a tendency for reduction when compared the first (2nd) and last (12th) months. In the case of nLF and nHF, a trend of nLF predominance in the 2nd and 3rd month was revealed while an inverse relation was observed from the 6th month on, with nHF superiority. Overall, males reached comparable or slightly higher NA and non-normalized HRV values compared to females, although most differences were not statistically significant. A parallel decline of LF (starting from the 10th month) and HF (from the 6th month) was demonstrated in both male and female animals. Female rats had a little more stable nLF and nHF course in the study time. Conclusions. Rat ANS aging is associated with global HRV decrease with parallel plasma NA decline, although without selective impairment of individual (sympathetic/parasympathetic) ANS components.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2016, 10, 1; 50-56
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 39

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