Heart rate variability and baroreceptor reflex sensitivity in doxorubicin-induced cardiomyopathy

2014 ◽  
Author(s):  
Tatjana Loncar-Turukalo ◽  
Marko Vasic ◽  
Gorana Mijatovic ◽  
Nina Japundzic-Zigon ◽  
Dragana Bajic
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Baroreceptor Reflex ◽  
Baroreceptor Reflex Sensitivity

scholarly journals Cardiovascular effects of reflexology in healthy individuals: evidence for a specific increase in blood pressure

2012 ◽  
Vol 2 (1) ◽  
pp. 4 ◽  
Author(s):  
Elisabeth Ruiz Padial ◽  
Nieves Torres López ◽  
Javier Luna Bujaldón ◽  
Isabel Espadas Villanueva ◽  
Gustavo Reyes del Paso
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Waiting Time ◽  
Healing Process ◽  
Cardiovascular Effects ◽  
Baroreceptor Reflex ◽  
Control Group ◽  
Time Control ◽  
Baroreceptor Reflex Sensitivity

The present study evaluates the cardiovascular effects of reflexology in a healthy sample. Forty-one participants were randomly assigned to one of three experimental groups: reflexology (n=15), non-professional foot massage (n=14), and a waiting time control group (n=12). Dependent variables were systolic, diastolic and mean blood pressure, inter-beat interval, heart rate variability and baroreceptor reflex sensitivity measured pre- and post- interventions. The study was performed during three 40-min sessions separated by weekly intervals. Results show that the three manipulations produce similar increases in inter-beat interval, heart rate variability and baroreceptor reflex sensitivity. Reflexology specifically produces an increase in blood pressure, which increases gradually over the three sessions. The parallel increase in heart rate variability and baroreceptor reflex sensitivity together with the increase in blood pressure suggest that reflexology is associated with a co-activation of both sympathetic and parasympathetic branches of the Autonomic Nervous System. These changes could be helpful in optimizing homeostatic activity, promoting the healing process and increasing the human organism’s capacity to respond adaptively to internal and external challenges. Finally, the observed physiological changes in the waiting-time control group shows the relevance of habituation processes and suggests the need for addition of waiting-time control groups in future studies.

Validation of spontaneous assessment of baroreceptor reflex sensitivity and its relation to heart rate variability in the ovine fetus pre- and near-term

2009 ◽  
Vol 87 (9) ◽  
pp. 736-742 ◽  
Author(s):  
Martin G. Frasch ◽  
Thomas Müller ◽  
Mark Szynkaruk ◽  
Matthias Schwab
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Reference Method ◽  
Baroreceptor Reflex ◽  
Vasoactive Drugs ◽  
Sequence Method ◽  
Baroreceptor Reflex Sensitivity ◽  
Ovine Fetus ◽  
Fetal Heart Rate Variability ◽  
Near Term

Assessment of baroreceptor reflex sensitivity (BRS) in the ovine fetus provides insight into autonomic cardiovascular regulation. Currently, assessment of BRS relies on vasoactive drugs, but this approach is limited by feasibility issues and by the nonphysiologic nature of the stimulus. Thus we aimed to validate the method of spontaneous BRS assessment against the reference method of using vasoactive drugs in preterm (0.76 gestation, n = 16) and near-term (0.86 gestation, n = 16) chronically instrumented ovine fetuses. The BRS measures derived from the spontaneous and reference methods correlated at both gestational ages (R = 0.67 ± 0.03). The sequence method of spontaneous BRS measures also correlated both to the root mean square of standard deviations (RMSSD), which is a measure of fetal heart rate variability reflecting vagal modulation (R = 0.69 ± 0.03), and to fetal body weight (R = 0.65 ± 0.03), which is a surrogate for growth trajectory of each fetus. The methodology presented may aid in developing new models to study BRS and cardiovascular control in ovine fetus in the last trimester of pregnancy.

scholarly journals Heart rate variability and baroreceptor reflex sensitivity in early- versus late-onset preeclampsia

PLoS ONE ◽  
2017 ◽  
Vol 12 (10) ◽  
pp. e0186521 ◽  
Author(s):  
Thomas Michael Weber ◽  
Helmut Karl Lackner ◽  
Andreas Roessler ◽  
Ilona Papousek ◽  
Vassiliki Kolovetsiou-Kreiner ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Late Onset ◽  
Baroreceptor Reflex ◽  
Baroreceptor Reflex Sensitivity

Blood pressure and heart rate variability in early pregnancy in rats

1997 ◽  
Vol 273 (4) ◽  
pp. H1794-H1799 ◽  
Author(s):  
Brigitte F. M. Slangen ◽  
Iris C. M. Out ◽  
Ben J. A. Janssen ◽  
Louis L. H. Peeters
Keyword(s):  
Heart Rate ◽  
Spectral Density ◽  
Early Pregnancy ◽  
High Frequency ◽  
Baroreceptor Reflex ◽  
Pregnant Rats ◽  
Mean Values ◽  
Coefficients Of Variation ◽  
Baroreceptor Reflex Sensitivity ◽  
Time Series Method

Changes in the autonomic control of the circulation may contribute to the maternal hemodynamic adaptation to early pregnancy. To evaluate this, we studied mean arterial pressure (MAP) and heart rate (HR) in chronically instrumented, conscious rats in early ( days 4, 6, 8, and 10) and late ( day 18) pregnancy ( n = 8) and in nonpregnant rats ( n = 9). MAP and HR were recorded on a beat-to-beat basis and analyzed by spectral analysis. Spectral density power was calculated in low- (0.047–0.305 Hz), mid- (0.305–0.598 Hz), and high-frequency (0.598–1.494 Hz) bands, which contain oscillations that are among others related to myogenic-, sympathetic/vagal-, and vagal/respiration-related influences, respectively. In addition, baroreceptor reflex sensitivity was determined from spontaneous variations in MAP and HR by a sequential time series method and by calculating the transfer gain between MAP and HR in the midfrequency band. Mean values of HR and MAP did not differ between the two groups on day 4. In the pregnant group, MAP fell gradually over days, whereas HR had significantly increased only on day 18. Overall variability in MAP and HR (expressed as coefficients of variation) did not change during pregnancy. Baroreceptor reflex sensitivity did not differ between the groups and did not change with advancing pregnancy. Spontaneous oscillations of MAP and HR at low, mid, and high frequencies were not different between pregnant and nonpregnant rats on days 4 to 10. On day 18, spectral density power of MAP, but not of HR, in the high-frequency band had significantly increased in pregnant rats only, most likely reflecting the increased impact of breathing on MAP fluctuations. We conclude that, with the methods employed, we could not discern any changes in baroreflex sensitivity and MAP and HR variability in pregnancy. This would imply that changes in autonomic activity do not contribute appreciably to the hemodynamic adaptations in early rat pregnancy.

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