Sex-specific reaction of the cardiac autonomic ­nervous system to different training phases in Swiss elite runners

2017 ◽  
Vol 65 (1) ◽  
Keyword(s):  
Nervous System ◽  
Sex Differences ◽  
Autonomic Nervous System ◽  
Sympathetic Activity ◽  
Low Frequency ◽  
Parasympathetic Activity ◽  
Cardiac Autonomic Nervous System ◽  
Autonomic Nervous ◽  
Low Intensity ◽  
Elite Runners

Background: Heart rate variability (HRV) as a measure of the cardiac autonomic nervous system activity (CANA) has the potential to tailor endurance training and may contribute to the prevention of overtraining. We aimed to investigate whether there are sex differences and sex-specific reactions of the CANA to different training periods (TPs) in Swiss elite runners. Methods: Two HRV measurements (each 5 minutes supine and 5 minutes standing) per athlete were performed, the first during preparation period (PP) and the second during competition period (CP). Main outcome parameters were the square root of the mean squared differences of successive R-R intervals in supine position (RMSSDsupine) as a time-domain marker of parasympathetic activity and the low frequency/high frequency power ratio after orthostatic challenge (LF/HFstand) as a frequency-domain marker of the sympatho-vagal balance. Average total number of training sessions per week (TSPW) as well as number of high-intensity and low-intensity TSPW was recorded. Results: Fifteen female (23.5±4.2 years) and 22 male (21.8±3.2 years) elite runners were included. Females reported a higher number of low-intensity TSPW in PP while there were no sex differences in any other training parameters. Females showed a higher RMSSDsupine and a lower LF/HFstand compared to their male counterparts in both training periods. Males showed a higher LF/HFstand in CP compared to PP while LF/HFstand remained unchanged in females in both periods. Conclusion: Male runners showed a shift towards higher markers of sympathetic activity in CP compared to PP while these markers did not change between TPs in female runners. Compared to males, females had higher markers of parasympathetic activity and lower markers of sympathetic activity in all TPs.

Baseline heart rate variability in healthy centenarians: differences compared with aged subjects (>75 years old)

1999 ◽  
Vol 97 (5) ◽  
pp. 579-584 ◽  
Author(s):  
Giuseppe PAOLISSO ◽  
Daniela MANZELLA ◽  
Michelangela BARBIERI ◽  
Maria Rosaria RIZZO ◽  
Antonio GAMBARDELLA ◽  
...  
Keyword(s):  
Nervous System ◽  
Autonomic Nervous System ◽  
High Frequency ◽  
Low Frequency ◽  
Frequency Component ◽  
Cardiac Autonomic Nervous System ◽  
Autonomic Nervous ◽  
Nervous System Activity ◽  
Aged Subjects ◽  
Normalized Units

Healthy centenarians have better anthropometric, endocrine, metabolic and immunological parameters than aged subjects (> 75 years old). Heart rate variability (HRV) has been demonstrated to be a good index of the cardiac autonomic nervous system. It is not known whether there are any differences in cardiac autonomic nervous system activity between aged subjects and healthy centenarians. It is possible that differences in cardiac autonomic nervous system activity could represent one of a cluster of factors explaining the extreme survival of centenarians. Thus we aimed to answer the following question: is there any difference in baseline HRV parameters between aged subjects and healthy centenarians? Therefore power spectral analysis of HRV at baseline was investigated in 25 aged subjects (age ⩾ 75 years) and 30 healthy centenarians (age ⩾ 100 years). Anthropometric measurements were made in all subjects, fasting blood samples were drawn for metabolite determinations, and HRV was determined. Independent of age, gender, body mass index and fasting plasma noradrenaline and free 3,3′,5-tri-iodothyronine concentrations, healthy centenarians had lower basal values for total power (1318±546 compared with 1918±818 ms2; P< 0.01) and the low-frequency component (33±21 compared with 50±11 normalized units; P< 0.03) and a higher value for the high-frequency component (77±15 compared with 61±18 normalized units; P< 0.05) than aged subjects. Consequently, the low-frequency/high-frequency ratio (0.43±0.07 compared with 0.91±0.05; P< 0.02) was also lower in the healthy centenarians than in the aged subjects. Our study demonstrates that the basal low-frequency/high-frequency ratio, an indirect index of cardiac sympathovagal balance, is lower in healthy centenarians than in aged subjects.

The Autonomic Nervous System, Sex Differences, and Chronobiology under General Anesthesia in In Vivo Experiments Involving Rats

2021 ◽  
Author(s):  
Pavol Svorc Jr ◽  
Pavol Svorc
Keyword(s):  
Nervous System ◽  
Sex Differences ◽  
Autonomic Nervous System ◽  
General Anesthesia ◽  
Spectral Power ◽  
Dark Period ◽  
Low Frequency ◽  
Light Period ◽  
Autonomic Nervous

The aim was to evaluate the current state of the autonomic nervous system (ANS) activity under general anesthesia using heart rate variability (HRV) in dependence on the light-dark (LD) cycle in healthy, sexually mature, spontaneously breathing, zoletil-anesthetized (30 mg/kg) Wistar rats of both sexes after a 4-week adaptation to an LD cycle (12 h:12 h). The animals were divided into four experimental groups according to sex and light period (n = 20 each). RR interval duration, spectral power at very-low-frequency (VLF), low-frequency (LF) and high-frequency (HF), total spectral power of HRV, and the LF/HF ratio were analyzed. Sympathetic and baroreceptor activity was decreased, and parasympathetic activity was increased in both sexes and in both light periods. Regarding sex differences, HRV was significantly lower in females versus males in the light period. In the dark period, females exhibited higher HRV than males. Regarding LD differences, in females, HRV was lower in the light versus the dark period, unlike males, in which HRV was higher in the dark versus the light period of the rat regimen day. Sex differences in the activity of the ANS were apparent in rats, persisted under general anesthesia, and were dependent on the LD cycle.

scholarly journals Assessment of Cardiac Autonomic Nervous System Involvement in Systemic Sclerosis via Exercise Heart Rate Recovery

2014 ◽  
Vol 24 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Ugur Nadir Karakulak ◽  
Sercan Okutucu ◽  
Levent Şahiner ◽  
Naresh Maharjan ◽  
Elifcan Aladag ◽  
...  
Keyword(s):  
Heart Rate ◽  
Nervous System ◽  
Autonomic Nervous System ◽  
Systemic Sclerosis ◽  
Heart Rate Recovery ◽  
Exercise Heart Rate ◽  
Cardiac Autonomic Nervous System ◽  
System Involvement ◽  
Autonomic Nervous

scholarly journals Analysis of heart rate variability in corn snakes (Pantherophis guttatus)

2021 ◽  
Vol 10 (11) ◽  
pp. e294101119781
Author(s):  
Antonio Gomes da Silva Neto ◽  
Daniel Souza Ferreira Magalhães ◽  
Raduan Hage ◽  
Laurita dos Santos ◽  
José Carlos Cogo
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Nervous System ◽  
Autonomic Nervous System ◽  
Low Frequency ◽  
Autonomic Nervous ◽  
Rr Interval ◽  
Diagnosis And Prognosis ◽  
Frequency Domains ◽  
The Time Domain

The assessment of heart rate variability (HRV) by linear methods in conjunction with Poincaré plots can be useful for evaluating cardiac regulation by the autonomic nervous system and for the diagnosis and prognosis of heart disease in snakes. In this report, we describe an analysis of HRV in conscious adult corn snakes Pantherophis guttatus (P. guttatus).  The electrocardiogram (ECG) parameters were determined in adult corn snakes (8 females, 13 males) and used for HRV analysis, and the RR interval was analyzed by linear methods in the time and frequency domains. There was no sex-related difference in heart rate. However, significant differences were seen in the duration of the P, PR, and T waves and QRS complex; there was no difference in the QT interval. The values for the RR interval varied by 15.3% and 18.8% in male and female snakes, respectively, and there was considerable variation in the values for the high and low frequency domains. The changes in the time domain were attributed to regulation by the parasympathetic branch of the autonomic nervous system, in agreement with variations in the high and low frequency domains. The values for standard deviations 1 and 2 in Poincaré plots, as well as the values of the frequency domain, provide useful parameters for future studies of cardiac function in P. guttatus.

scholarly journals Liver cirrhosis-effect on QT interval and cardiac autonomic nervous system activity

2018 ◽  
Vol 9 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Elias Tsiompanidis ◽  
Spyros I Siakavellas ◽  
Anastasios Tentolouris ◽  
Ioanna Eleftheriadou ◽  
Stamatia Chorepsima ◽  
...  
Keyword(s):  
Nervous System ◽  
Liver Cirrhosis ◽  
Autonomic Nervous System ◽  
Qt Interval ◽  
Autonomic Nervous System Activity ◽  
System Activity ◽  
Cardiac Autonomic Nervous System ◽  
Autonomic Nervous ◽  
Nervous System Activity

scholarly journals The state of response of autonomic nervous system in children with mitral valve prolapse

2021 ◽  
Vol 26 (4) ◽  
pp. 74-80
Author(s):  
І.О.  Mitiuriaeva-Korniyko ◽  
O.V. Kuleshov ◽  
Ya.A. Medrazhevska ◽  
L.O. Fik ◽  
T.D. Klets
Keyword(s):  
Heart Rate ◽  
Nervous System ◽  
Autonomic Nervous System ◽  
Mitral Valve ◽  
Frequency Domain ◽  
Mitral Valve Prolapse ◽  
Low Frequency ◽  
Very Low Frequency ◽  
Autonomic Nervous ◽  
Significant Difference

The article presents summarized materials on connective tissue dysplasia of the heart, primary mitral valve prolapse, dysfunction of the autonomic system. Aim of research: to estimate the condition of autonomic nervous system in children with primary mitral valve prolapse. We examined 106 children with mitral valve prolapse aged from 13 to 17 years old on the clinical base of city hospital “Center of mother and child” in Vinnitsya. Research included time and frequency domain (evaluation with cardiointervalography. Final results were compared with the control group records. The results showed no statistical significance among time domain parameters in the main group of children. All these indices displayed tendency to sympathetic and parasympathetic autonomic nervous system tonus increase in boys. However, sympathicotonia tendency was noted in girls only. Frequency domain parameters showed similar results, compared with the previous. Nevertheless, very low frequency parameters had statistically significant difference in both subgroups of patience with mitral valve prolapse, including males (3205.8±190.9 against 1717±154, р<0.05) and females (3280±220.1 against 1433±811, р<0.05). There were no statistically significant difference among other frequency domain parameters. Conclusions: we estimated that children with mitral valve prolapse have imbalanced autonomic homeostasis manifested by tone disturbances of both autonomic vegetative system branches with sympathetic predominance. Patients with primary mitral valve prolapse generally have increased sympathetic tone - both boys and girls - according to spectral analysis of heart rate variability indices, heart rate oscillation power of a very low frequency in particular (p<0.05). In children with mitral valve prolapse, the tone of parasympathetic nervous system is generally normal; there is a tendency to its increase in boys and decrease in girls. These children should be under close medical supervision by pediatricians and cardiologists.

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