Sympathetic nervous system representation in time and frequency domain indices of heart rate variability

1998 ◽  
Vol 79 (1) ◽  
pp. 69-73 ◽  
Author(s):  
Carisi A. Polanczyk ◽  
Luis E. P. Rohde ◽  
Ruy S. Moraes ◽  
Elton L. Ferlin ◽  
Cristina Leite ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Nervous System ◽  
Sympathetic Nervous System ◽  
Frequency Domain ◽  
Sympathetic Nervous ◽  
System Representation

Changes in the sympathetic nervous system induced by 42 days of head-down bed rest

1998 ◽  
Vol 274 (6) ◽  
pp. H1875-H1884 ◽  
Author(s):  
Dominique Sigaudo ◽  
Jacques-Olivier Fortrat ◽  
Anne-Marie Allevard ◽  
Alain Maillet ◽  
Jean-Marie Cottet-Emard ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Nervous System ◽  
Sympathetic Nervous System ◽  
Baroreflex Sensitivity ◽  
Bed Rest ◽  
Urinary Catecholamines ◽  
System Activity ◽  
Nervous System Activity ◽  
Sympathetic Nervous

Changes in autonomic nervous system activity could be linked to the orthostatic intolerance (OI) that individuals suffer after a spaceflight or head-down bed rest (HDBR). We examined this possibility by assessing the sympathetic nervous system activity during 42 days of HDBR in seven healthy men. Heart rate variability was studied with the use of power spectral analysis, which provided indicators of the sympathetic (SNSi) and parasympathetic (PNSi) nervous system influences on the heart. Urinary catecholamines and the spontaneous baroreflex sensitivity were measured. Urinary catecholamines decreased by 21.3%, showing a decrease in SNSi. Heart rate variability was greatly reduced during 42 days of HDBR with a drop in PNSi but with no significant changes in SNSi. The baroreflex sensitivity was greatly reduced (30.7%) on day 42 of HDBR. These results suggest a dissociation between the catecholamine response and the SNSi of the heart rate. This dissociation could be the consequence of an increase in β-adrenergic receptor density and/or activity induced by a decrease in catecholamines during HDBR. The subjects who suffered from OI also had a greater sympathetic response and much lower baroreflex sensitivity when supine than those who finished the stand test. However, the mean response of all subjects indicated that the sympathetic activity (catecholamine excretion) was probably slightly inhibited during HDBR and could contribute to OI.

scholarly journals Changes in Short-Term and Ultra-Short Term Heart Rate, Respiratory Rate, and Time-Domain Heart Rate Variability Parameters during Sympathetic Nervous System Activity Stimulation in Elite Modern Pentathlonists—A Pilot Study

Diagnostics ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1104
Author(s):  
Jakub S. Gąsior ◽  
Bartosz Hoffmann ◽  
Luiz Eduardo Virgilio Silva ◽  
Łukasz Małek ◽  
Andrew A. Flatt ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Nervous System ◽  
Sympathetic Nervous System ◽  
Time Domain ◽  
Endurance Athletes ◽  
Sympathetic Nervous System Activity ◽  
Short Term ◽  
Nervous System Activity ◽  
Sympathetic Nervous

Monitoring of markers reflecting cardiac autonomic activity before and during stressful situations may be useful for identifying the physiological state of an athlete and may have medical or performance implications. The study aimed to determine group and individual changes in short-term (5 min) and ultra-short-term (1 min) heart rate (HR), respiratory rate (RespRate), and time-domain heart rate variability (HRV) parameters during sympathetic nervous system activity (SNSa) stimulation among professional endurance athletes. Electrocardiographic recordings were performed in stable measurement conditions (Baseline) and during SNSa stimulation via isometric handgrip in 12 elite modern pentathlonists. Significant increases in short-term HR and decreases in time-domain HRV parameters with no changes in RespRate were observed during SNSa stimulation. Significant differences were observed between Baseline (all minutes) and the last (i.e., 5th) minute of SNSa stimulation for ultra-short-term parameters. Analysis of intra-individual changes revealed some heterogeneity in responses. The study provides baseline responses of HR, RespRate, and time-domain HRV parameters to SNSa stimulation among elite pentathlonists, which may be useful for identifying abnormal responses among fatigued or injured (e.g., concussed) athletes. More attention to individual analysis seems to be necessary when assessing physiological responses to sympathetic stimuli in professional endurance athletes.

scholarly journals Analysis of the heart rate variability in cardiac abnormalities in workers employed in oil production

2019 ◽  
Vol 95 (1) ◽  
pp. 41-45 ◽  
Author(s):  
Alexander E. Nosov ◽  
A. S. Baydina ◽  
E. M. Vlasova ◽  
V. B. Alekseev
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Nervous System ◽  
Sympathetic Nervous System ◽  
Work Experience ◽  
Disease Risk ◽  
Cardiovascular Disease Risk ◽  
Oil Production ◽  
Sympathetic Nervous ◽  
The Impact

Reduced heart rate variability (HRV) is associated with the elevated mortality rate in patients with cardiovascular disease. Risk factors, in terms of the negative impact on the cardiovascular system of workers of oil production include noise, vibration, the severity of the labor process, climate, lighting, and various chemicals presenting in the working area (the total of various hydrocarbons, including aromatic hydrocarbons, disulfide sulfur). HRV indices were recorded daily by Holter monitoring. Employees with the work experience at oil production from 10 to 20 years were established to have a statistically significant increase in tone of the sympathetic nervous system, characterized by the decline ofpNN50 by 2.2 times and the increase of the vagal tone, characterized by an increase in SDANN by 1.4 times and SDNN - by 1.3 times. A significant dependence of the probability of the increasing of the tone of the sympathetic nervous system from work experience was established. Thus, the impact of hazards of oil-producing enterprise is associated with prognostically unfavorable changes in HRV. These changes may exacerbate hypertension in employees, which requires measures for the primary prevention of cardiovascular diseases.

Abstract P161: Tai Chi Movements Bring On Parasympathetic Nerve Output As Indicated By Audible Bowel Sounds

Circulation ◽  
2021 ◽  
Vol 143 (Suppl_1) ◽  
Author(s):  
Desuo Wang
Keyword(s):  
Heart Rate ◽  
Nervous System ◽  
Sympathetic Nervous System ◽  
Tai Chi ◽  
Parasympathetic Nervous System ◽  
Autonomic Nerve ◽  
Parasympathetic Nerve ◽  
Bowel Sounds ◽  
Sympathetic Nervous ◽  
Tai Chi Exercise

Tai Chi movements are unique exercise that can improve cognition, strength somatomotor coordination, and enhance autonomic nerve regulation on internal organ function. The mild increase in heart rate and/or slight sweat during and after practicing Tai Chi indicates the activation of the sympathetic nervous system. There is lack of evidence to show that Tai Chi exercise enhances the activity of parasympathetic nervous system though it has been claimed that practicing Tai Chi could do so. The author tested the hypothesis that Tai Chi exercise brings on an increase in parasympathetic nerve outputs (PNO). The PNO is evaluated by recording the bowel sounds using an audio recorder (Sony digital voice recorder ICD-PX Series) and the data analyses were done using NCH software (WavePad audio editor). The heart rate was simultaneously recorded using a fingertip pulse oximeter (Zacurate Pro Series 500DL) during Tai Chi exercise. All the data was repeatedly collected from a Tai Chi Master in a study period of 6 months. A total of 30 recordings were used to carry out the analysis. The audible bowel sounds occurred when the performer started to do the Ready-Movement of Yang-style Tai Chi. These Tai Chi induced-bowel sounds lasted from the beginning to the end of a set of movements (3-5 min for 24-moves style). The frequency of bowel sounds was in a range of 0.2 to 3.5 Hz. The average number of bowel sounds was approximately 2.5 sounds per Tai Chi Move. The intensity and frequency of the bowel sounds are not related to the change of the performer’s heart rate. In comparison, meditation or deep squat exercise performed by the Tai Chi master did not cause any changes in the bowel sounds. According to the autonomic innervation of the GI tract, increase of bowel movements is mediated by PNO. In conclusion, Tai Chi movements can simultaneously exercise skeletal muscles, sympathetic nervous system and parasympathetic nervous system. The enhancement of parasympathetic nervous system output by Tai Chi exercise is a valuable modality of physical exercise for wellness.

Pentobarbital effects on plasma catecholamines: temperature, heart rate, and blood pressure

1985 ◽  
Vol 248 (1) ◽  
pp. E95-E100 ◽  
Author(s):  
D. Baum ◽  
J. B. Halter ◽  
G. J. Taborsky ◽  
D. Porte
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Nervous System ◽  
Animal Models ◽  
Sympathetic Nervous System ◽  
Rectal Temperature ◽  
Plasma Catecholamines ◽  
Plasma Catecholamine ◽  
Sympathetic Nervous ◽  
Plasma Catecholamine Concentrations

The effects of intravenous pentobarbital were studied in dogs. Plasma pentobarbital concentrations were inversely related to epinephrine and norepinephrine concentrations. Plasma catecholamines appeared fully suppressed at pentobarbital levels greater than 25-30 micrograms/ml. Furthermore, pentobarbital levels were negatively related to rectal temperature, heart rate, and mean blood pressure. The methods of pentobarbital administration influenced plasma pentobarbital as well as epinephrine and norepinephrine levels, temperature, heart rate, and blood pressure. These observations suggest the possibility that pentobarbital inhibits the sympathetic nervous system, which in turn may affect temperature, heart rate, and blood pressure. Because pentobarbital anesthesia affects plasma catecholamine concentrations, the regimen used in animal models requires consideration when interpreting data potentially influenced by the sympathetic nervous system.

scholarly journals Biomedical Teleacupuncture between China and Austria Using Heart Rate Variability—Part 2: Patients with Depression

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Gerhard Litscher ◽  
Guangyu Cheng ◽  
Lu Wang ◽  
Weiping Cheng ◽  
Hang Su ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Nervous System ◽  
Autonomic Nervous System ◽  
Frequency Domain ◽  
Chinese Patients ◽  
Clinical Effects ◽  
Autonomic Nervous ◽  
The Third ◽  
Stimulation Period

It has been shown in previous studies that the autonomic nervous system can be affected by acupuncture. Within this study, teleacupuncture between China and Austria is used for quantifying the effects of heart rate (HR) and heart rate variability (HRV) in 33 Chinese patients (27 females, 6 males; mean age ± SD49.5±13.1years; range 22–72 years) suffering from depression. Electrocardiographic signals before, during, and after acupuncture at the acupoint Baihui (GV20) were recorded in Harbin and analyzed in Graz using teleacupuncture. HRV data were analyzed in the time and frequency domain. Mean HR decreased significantly (P<0.05) during and after acupuncture, whereas total HRV increased significantly after the third acupuncture stimulation period (P<0.05) and also 5–10 minutes after (P<0.05) acupuncture. The study shows that HRV could be a useful parameter for quantifying clinical effects of acupuncture on the autonomic nervous system.

scholarly journals HEART RATE VARIABILITY OF STUDENTS WITH DIFFERENT PROFILES OF MOTOR DOMINATION DURING EXAM

2017 ◽  
Vol 18 (3.1) ◽  
pp. 203-209
Author(s):  
A.I. Lukina
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Nervous System ◽  
Activity Coefficient ◽  
Spectral Power ◽  
Regulatory Mechanisms ◽  
Wave Parameters ◽  
Increasing Trend ◽  
Heart Rate Fluctuations ◽  
Sympathetic Nervous

It is established hat changing of parameters of student’s electrocardiogram during the exam are shown by shortening of the intervals RR, QT, PQ, and the complex QRS, thus expressiveness of reactions dominates in sample of lefthanders and ambidexters. The values of wave parameters of heart rate variability, including spectral power of heart rate fluctuations in different frequency ranges, increase in left-handers, while ambidexterity and right handed down. The values of statistical indices of HRV, including SDNN, RMSSD and mode cardio intervals in students during the exam are reduced, and also to a greater extent, and ambidexterity for lefties. These changes corresponded to increasing trend of the index and the activity coefficient Baevsky sympathetic nervous system, indicating a greater intensity of regulatory mechanisms in individuals with left profile of motor domination.

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