scholarly journals Wave Structure of Heart Rhythm During Tilt Test for Persons with Different Levels of Vegetative Tonus

2021 ◽  
pp. 4-11
Author(s):  
O.I. Androschuk ◽  
A.V. Rybalko ◽  
L.I. Kudii ◽  
N.P. Chernenko
Keyword(s):  
Heart Rate ◽  
Young Men ◽  
Wave Structure ◽  
Heart Rhythm ◽  
Vertical Position ◽  
Frequency Range ◽  
Autonomic Tone ◽  
Baseline Levels ◽  
Two Peaks ◽  
Different Levels

Introduction. It is known that there are typological features among healthy young people according to the level of autonomic tone. Accordingly, there are groups of sympatho-, normo- and vagotonics. Work has been carried out to study the influence of the initial level of autonomic tone on thereactions of the cardiovascular system in respiratory hypocapnia, pulsed ophthalmic photostimulation, in different phases of the biological cycle for women. However, there is no work on the analysis of changes in the wave structure of heart rate depending on the initial level of autonomic tone. Purpose. The aim was to determine the features of the wave structure of the heart rhythm during orthoprobe for healthy young men with different levels of tone of the autonomic nervous system at rest. Methods. Measurements were performed in conditions close to the main exchange. 117 healthy young men aged 18-23 years were examined in compliance with the requirements of bioethics. Three main spectral components were analyzed in the tRR spectrum: HF (0.15-0.4 Hz) LF (0.04-0.15Hz); VLF (0-0.04 Hz); TP (0-0.4 Hz). The amplitude of the largest peak of the tRR spectrogram in the frequency range 0.04-0.15 Hz (aLF) and its frequency (tLF) were calculated. Normalized median spectrograms of tRR oscillations were constructed.Results.A significant decrease in HF was observed in individuals of all three groups during orthoprobe. The median reactivity of reactivity was -67.3%, -77.5%, -77.9% for groups I, II and III, respectively. There were no differences between the groups due to the reactivity of this indicator. The reactivity of LF to changes in body position for sympathotonics was significantly different.The frequency of the maximum peak of the spectrogram in the range of low often resting heart rate did not differ between groups. This indicator probably decreased during orthoprobe in groups IIand III. It was found that the wave has two peaks in the vertical position in persons with different baseline levels of autonomic tone for vagotonics and normotonics in the frequency range from 0.04 to0.15 Hz. Originality. Differences in the reactivity of heart rate waves to orthoprobe for healthy young men with different baseline levels of autonomic tone were detected for the first time. Conclusions. The greatest differences in changes in the wave structure of the heart rhythm during orthoprobe for persons with different baseline levels of autonomic tone are manifested in therange of low heart rate. Spectrum reduction reactions in this range were predominant for sympathotonics. The reactions of increasing LF and the amplitude of the maximum peak of the spectrogram were predominant for normo- and parasympathotonics. It was found that the wave has two peaks in the vertical position in persons with different baseline levels of autonomic tone for vagotonics and normotonics in the frequency range from 0.04 to 0.15 Hz. Sympathotonics have one wave of orthopedic reactivity with maxima at 0.09 Hz in the low heart rate range. Normotonics have two waves of reactivity per orthoprobe with frequencies of 0.08Hz and 0.11 Hz. Parasympathotonics also have two waves with frequencies of 0.07 Hz and 0.09Hz. Prospects for further research include elucidation of the mechanisms of tRR wave formation depending on the level of vegetative tone under different conditions. Key words: wave structure of heart rhythm, vegetative tone, sympathotonics, normotonics, vagotonics.

scholarly journals Parameters of heart rate variability associated with high sports performance in athletes

2021 ◽  
Vol 11 (5) ◽  
pp. 128-141
Author(s):  
Olga Vladislavovna Balberova ◽  
◽  
Elena Gennadyevna Sidorkina ◽  
Ksenia Sergeevna Koshkina ◽  
Evgeny Vitalievich Bykov ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Functional Performance ◽  
Dynamic Control ◽  
Wave Structure ◽  
Heart Rhythm ◽  
Football Players ◽  
Functional Fitness ◽  
Additional Function ◽  
Diagnostic Criterion

Introduction. The problem of developing clear criteria for assessing athletes’ functional fitness, which would reflect their readiness for competitions, remains under-researched in the theory of sports. Football places high demands on athletes’ functional fitness, including the vegetative component. However, attempts to improve results in football often focus on techniques and tactics to the detriment of the functional component. It should also be noted that the intensity of exercises varies depending on the playing position during matches, and, therefore, an accurate diagnostic criterion is required to assess the players’ of different positions functional readiness for competitions. The article attempts to identify the parameters of heart rate variability which could be used as markers of athletes’ playing game sports high functional performance. The aim of this research is to identify the parameters of heart rate variability as a diagnostic criterion for assessing football players’ functional readiness for competitions. Materials and Methods. In order to assess the heart rate variability, the software for the “Polyspectrum” electrocardiograph was used with an additional function of obtaining data on heart rate variability. Results. The research findings suggest that football players with high athletic performance demonstrate higher vagal and lower sympathetic modulation of the heart rhythm, which indicates their higher fitness, adaptability to loads and functional readiness for competitions. On the contrary, the athletes of the second group demonstrated signs of strain of adaptation systems and over-training. Conclusions. Monitoring heart rate variability in athletes (in particular, heart rhythm wave structure indicators, expressed as the area of the triangle formed by the spectral density of all three waves) can be used as an effective tool in the dynamic control of training, in identifying athletes’ fitness, as well as for predicting sports results.

Individual differences in the heart rate response to activation of the muscle metaboreflex in humans

2010 ◽  
Vol 299 (5) ◽  
pp. H1708-H1714 ◽  
Author(s):  
Kazuhito Watanabe ◽  
Masashi Ichinose ◽  
Naoto Fujii ◽  
Mayumi Matsumoto ◽  
Takeshi Nishiyasu
Keyword(s):  
Heart Rate ◽  
Individual Differences ◽  
Arterial Pressure ◽  
Arterial Baroreflex ◽  
Frequency Range ◽  
Autonomic Tone ◽  
Isometric Handgrip ◽  
Baroreflex Control ◽  
Muscle Metaboreflex ◽  
Transfer Function Analysis

We tested the hypotheses that the heart rate (HR) response to muscle metaboreflex activation induced by postexercise muscle ischemia (PEMI) varies considerably among subjects and that individual differences in the HR response are associated with differences in cardiac autonomic tone and/or arterial baroreflex function during PEMI. Fifty-one healthy subjects (36 men and 15 women) performed a 1-min isometric handgrip exercise at 50% maximal voluntary contraction, which was followed by a 3.5-min period of imposed PEMI. We estimated cardiac autonomic tone using spectral analysis of beat-to-beat variation in the R-R interval (RRI). In addition, the sensitivity of the arterial baroreflex control of HR (BRS) was evaluated using transfer function analysis of systolic arterial pressure (SAP) and RRI. Although the mean RRI during the PEMI and subsequent recovery period did not differ from the resting value, the variance among the individual differences in RRI between the rest and PEMI periods was significantly greater than between the rest and recovery periods. The changes in RRI elicited by PEMI correlated significantly with changes in the spectral power of the RRI variability in the high-frequency range and the BRS. By contrast, no significant correlation was observed between changes in RRI and changes in mean arterial pressure or the power of the RRI variability in the low-frequency range. This suggests that, in humans, the HR response to PEMI-induced activation of muscle metaboreflex varies considerably from individual to individual and that these differences reflect changes in cardiac parasympathetic tone and spontaneous BRS during PEMI.

scholarly journals Gorban Features of autonomic regulation of heart rate depending on the composition of the body in young people

2021 ◽  
Vol 2 (1) ◽  
pp. 76-82
Author(s):  
V. V. Gorban ◽  
V. S. Menshix ◽  
E. V. Gorban
Keyword(s):  
Physical Activity ◽  
Heart Rate ◽  
Young People ◽  
Young Women ◽  
Young Men ◽  
Heart Rhythm ◽  
Overweight And Obesity ◽  
The Body ◽  
Parasympathetic Activity

Objective: of the research was to study preclinical changes in heart rate variability (HRV) associated with overweight and obesity in young people in order to determine the targets of predictive therapy.Material and methods: the study involved 105 young men and 111 young women aged 18 to 30 years. Questionnaires, anthropometry with determination of body mass index and waist circumference, bioimpedansometry with determination of body fat (BF) and visceral fat (VF) level, as well as monitoring of HRV based on short (ten-minute) records were carried out.Result: young people of both sexes showed a high frequency of overweight (24.1%) and obesity (18.5%), as well as a low level of physical activity (FA, 46.3%). In 28.8% of young men and 12.5% of young women with overweight and obesity, there was a high level of VF. Taking into account the outstripping increase in VF as compared to BF, it is reasonable to divide the VF levels into low (<5 conventional units), intermediate (5-9 conventional units), and high (> 9 conventional units). In overweight young people, compared with normal body weight, HRV is characterized by less pronounced parasympathetic activity, and in girls compared with young men, there is less total HRV. A high HRV level is associated with such HRV indicators as an increase values of LF/ HF and SDANN, reflecting, respectively, a reduction in the parasympathetic and enhanced sympathetic activity of the autonomic nervous system with a predominance of the central circuit of heart rhythm regulation over the autonomous one.Conclusion: to diagnose autonomic imbalance in young people, it is necessary to determine the composition of the body, FA level, take into account the individual dynamics of HRV parameters, since they rarely exceed the norm. Changes in total HRV, sympathetic and parasympathetic activity during the non-drug correction of obesity should be monitored with an emphasis on pNN (50) and SDANN indicators associated with BF, and when correcting physical activity — on the indicator of voltage index of regulatory systems.

Obesity does not Impair Ambulatory Cardiovascular and Autonomic Responses Post-exercise

2021 ◽  
Author(s):  
Gabriel Kolesny Tricot ◽  
Fabiula Isoton Isoton Novelli ◽  
Lucieli Teresa Cambri
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Diastolic Blood Pressure ◽  
Maximal Exercise ◽  
Young Men ◽  
Autonomic Modulation ◽  
Incremental Test ◽  
Post Exercise ◽  
Cardiac Autonomic Modulation ◽  
Main Effect

AbstractThis study aimed to assess whether obesity and/or maximal exercise can change 24 h cardiac autonomic modulation and blood pressure in young men. Thirty-nine men (n: 20; 21.9±1.8 kg·m−2, and n: 19; 32.9±2.4 kg·m−2) were randomly assigned to perform a control (non-exercise) and an experimental day exercise (after maximal incremental test). Cardiac autonomic modulation was evaluated through frequency domain heart rate variability (HRV). Obesity did not impair the ambulatory HRV (p>0.05), however higher diastolic blood pressure during asleep time (p=0.02; group main effect) was observed. The 24 h and awake heart rate was higher on the experimental day (p<0.05; day main effect), regardless of obesity. Hypotension on the experimental day, compared to control day, was observed (p<0.05). Obesity indicators were significantly correlated with heart rate during asleep time (Rho=0.34 to 0.36) and with ambulatory blood pressure(r/Rho=0.32 to 0.53). Furthermore, the HRV threshold workload was significantly correlated with ambulatory heart rate (r/Rho=− 0.38 to−0.52). Finally, ambulatory HRV in obese young men was preserved; however, diastolic blood pressure was increased during asleep time. Maximal exercise caused heart rate increase and 24h hypotension, with decreased cardiac autonomic modulation in the first hour, regardless of obesity.

Nursing Diagnosis for Potential Organ Donors: Accuracy Study

2021 ◽  
pp. 105477382110194
Author(s):  
Luciana Nabinger Menna Barreto ◽  
Éder Marques Cabral ◽  
Marina Raffin Buffon ◽  
Juliana Elenice Pereira Mauro ◽  
Lisiane Pruinelli ◽  
...  
Keyword(s):  
Heart Rate ◽  
Diagnostic Accuracy ◽  
Medical Records ◽  
Heart Rhythm ◽  
Organ Donors ◽  
Predictive Capacity ◽  
Nursing Diagnosis ◽  
Accuracy Study ◽  
Altered Blood ◽  
Accuracy Data

The objective was to analyze the diagnostic accuracy of Impaired physiological balance syndrome in potential brain-dead organ donors. It is a study of diagnostic accuracy. Data was retrospectively collected from 145 medical records through the filling out of an instrument containing 25 indicators of the nursing diagnosis (ND). Descriptive and inferential statistics were used. The prevalence of the ND was 77 (53.1%). The indicator with the best measures of accuracy was altered heart rate. Therefore, it has the best predictive capacity for determining the ND. It was identified that the absence of the indicators altered heart rate, hyperglycemia, and altered blood pressure is associated with the absence of the ND, while the presence of the indicators hyperthermia, hypothermia, and altered heart rhythm is associated with the presence of the ND. Accurate indicators will assist in diagnostic inference and the interventions and results will have greater chances of targeting and effectiveness.

Ultra-short heart rate variability reliability for cardiac autonomic tone assessment in mesial temporal lobe epilepsy

2021 ◽  
pp. 106662
Author(s):  
Hiago Murilo Melo ◽  
Jefferson Luiz Brum Marques ◽  
Guilherme Loureiro Fialho ◽  
Peter Wolf ◽  
André D’Ávila ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Temporal Lobe Epilepsy ◽  
Temporal Lobe ◽  
Mesial Temporal Lobe Epilepsy ◽  
Autonomic Tone ◽  
Mesial Temporal Lobe

Effects of spinal cord transection on sympathetic discharge in decerebrate-unanesthetized cats

1989 ◽  
Vol 257 (6) ◽  
pp. R1506-R1511 ◽  
Author(s):  
L. C. Weaver ◽  
R. D. Stein
Keyword(s):  
Blood Pressure ◽  
Spinal Cord ◽  
Heart Rate ◽  
Spectral Analysis ◽  
Spinal Cord Transection ◽  
Renal Nerves ◽  
Frequency Range ◽  
Renal Nerve ◽  
Sympathetic Discharge ◽  
Nerve Discharge

Previous experiments in our laboratory have shown that discharge of splenic, mesenteric, and splanchnic nerves is well maintained after spinal cord transection in chloralose-anesthetized cats (8, 9, 11). The primary purpose of this investigation was to determine if maintained sympathetic discharge could be observed after spinal transection in the absence of chloralose anesthesia. In cats anesthetized with alphaxalone-alphadolone, changes in splanchnic discharge, blood pressure, and heart rate caused by decerebration and removal of the forebrain were observed. This procedure decreased blood pressure, increased heart rate, and had no immediate effect on sympathetic discharge or its rhythm (assessed by power density spectral analysis). One hour after decerebration and termination of anesthesia, splanchnic discharge had increased by approximately 36%. Next, effects of spinal cord transection on discharge of splanchnic, mesenteric, and renal nerves were observed in the decerebrate-unanesthetized cats. Splanchnic discharge decreased by 50%, mesenteric nerve discharge was unchanged, and renal nerve discharge decreased by 97%. Therefore, splanchnic nerve discharge was not as well maintained in decerebrate-unanesthetized cats as it had been in chloralose-anesthetized animals, and the remaining splanchnic discharge appeared to affect mesenteric nerves preferentially. Finally, spectral analysis of the splanchnic discharge demonstrated that before cord transection, most of the signal was in the 0- to 6-Hz frequency range, whereas after transection the proportion of signal in this frequency range was significantly reduced and the proportion in higher frequencies (7-25 Hz) was significantly increased. This loss of low-frequency rhythmicity is consistent with findings in our previous studies in chloralose-anesthetized cats.

scholarly journals Quantitative analysis of the 24-hour blood pressure and heart rate patterns in young men.

Hypertension ◽  
1991 ◽  
Vol 18 (2) ◽  
pp. 199-210 ◽  
Author(s):  
J P Degaute ◽  
P van de Borne ◽  
P Linkowski ◽  
E Van Cauter
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Quantitative Analysis ◽  
Young Men

Characteristics of heart rate variability in patients with acute coronary syndrome without ST segment elevation in comparison with clinical and biochemical parameters

2021 ◽  
Vol 29 (3) ◽  
pp. 369-378
Author(s):  
Aleksej A. Nizov ◽  
Aleksej I. Girivenko ◽  
Mihail M. Lapkin ◽  
Aleksej V. Borozdin ◽  
Yana A. Belenikina ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Acute Coronary Syndrome ◽  
Creatine Phosphokinase ◽  
Spectral Power ◽  
Low Frequency ◽  
Heart Rhythm ◽  
St Segment Elevation ◽  
Coronary Syndrome ◽  
St Segment

BACKGROUND: The search for rational methods of primary, secondary, and tertiary prevention of coronary heart disease. To date, there are several publications on heart rate variability in ischemic heart disease. AIM: To study the state of the regulatory systems in the organism of patients with acute coronary syndrome without ST segment elevation based on the heart rhythm, and their relationship with the clinical, biochemical and instrumental parameters of the disease. MATERIALS AND METHODS: The open comparative study included 76 patients (62 men, 14 women) of mean age, 61.0 0.9 years, who were admitted to the Emergency Cardiology Department diagnosed of acute coronary syndrome without ST segment elevation. On admission, cardiointervalometry was performed using Varicard 2.51 apparatus, and a number of clinical and biochemical parameters were evaluated RESULTS: Multiple correlations of parameters of heart rate variability and clinical, biochemical and instrumental parameters were observed. From this, a cluster analysis of cardiointervalometry was performed, thereby stratifying patients into five clusters. Two extreme variants of dysregulation of the heart rhythm correlated with instrumental and laboratory parameters. A marked increase in the activity of the subcortical nerve centers (maximal increase of the spectral power in the very low frequency range with the underlying reduction of SDNN) in cluster 1 was associated with reduction of the left ventricular ejection fraction: cluster 147.0 [40.0; 49.0], cluster 260.0 [58.0; 64.0], cluster 360.0 [52.5; 64.5] % (the data are presented in the form of median and interquartile range; Me [Q25; Q75], p 0,05). Cluster 5 showed significant reduction in SDNN (monotonous rhythm), combined with increased level of creatine phosphokinase (CPC): cluster 5446,0 [186.0; 782.0], cluster 4141.0 [98.0; 204.0] IU/l; Me [Q25; Q75], p 0.05) and MВ-fraction of creatine phosphokinase; cluster 532.0 [15.0; 45.0], 4 cluster 412.0 [9.0; 18.0] IU/l; Me [Q25; Q75], p 0.05). CONCLUSIONS: In patients with acute coronary syndrome without ST segment elevation, cluster analysis of parameters of heart rate variability identified different peculiarities of regulation of the heart rhythm. Pronounced strain of the regulatory systems of the body was found to be associated with signs of severe pathology: the predominance of VLF (spectral power of the curve enveloping a dynamic range of cardiointervals in the very low frequency range) in spectral analysis with an underlying reduced SDNN is characteristic of patients with a reduced ejection fraction, and a monotonous rhythm is characteristic of patients with an increased level of creatine phosphokinase and MB-fraction of creatine phosphokinase.

Features of changes in heart rate variability indices in driving school cadets with different levels of preparedness

2021 ◽  
Author(s):  
S.E. Bebinov ◽  
O.N. Krivoshchekova ◽  
A.V. Nechaev
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Simulator Training ◽  
Training Level ◽  
Driver Training ◽  
Traffic Conditions ◽  
Key Words Heart ◽  
Key Words Heart Rate ◽  
Regulatory Systems ◽  
Different Levels

The research was carried out on two independent experimental groups of boys and girls. The first was observed in traffic conditions, the second during the period of auto-simulator training. The HRV indices were determined: HR - heart rate, IN - index of tension of regulatory systems, AMo - amplitude of the mode, LF/HF - index of vagosympathetic interaction. A pronounced sympathetic reaction of more prepared cadets to the training load with the subsequent restoration of the studied characteristics was revealed. Key words: heart rate variability, autonomic regulation, vagosympathetic interaction, driver training, level of preparedness.

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