scholarly journals Acute hydrocortisone administration reduces cardiovagal baroreflex sensitivity and heart rate variability in young men

2018 ◽  
Vol 596 (20) ◽  
pp. 4847-4861 ◽  
Author(s):  
Ahmed M. Adlan ◽  
Jet J. C. S. Veldhuijzen van Zanten ◽  
Gregory Y. H. Lip ◽  
Julian F. R. Paton ◽  
George D. Kitas ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Baroreflex Sensitivity ◽  
Young Men ◽  
Hydrocortisone Administration

Heart rate variability and baroreflex sensitivity are reduced in chronically undernourished, but otherwise healthy, human subjects

2003 ◽  
Vol 104 (3) ◽  
pp. 295-302 ◽  
Author(s):  
Mario VAZ ◽  
A.V. BHARATHI ◽  
S. SUCHARITA ◽  
D. NAZARETH
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
High Frequency ◽  
Baroreflex Sensitivity ◽  
Human Subjects ◽  
Normal Weight ◽  
Autonomic Nerve ◽  
Total Power ◽  
Healthy Human ◽  
Frequency Power

Alterations in autonomic nerve activity in subjects in a chronically undernourished state have been proposed, but have been inadequately documented. The present study evaluated heart rate and systolic blood pressure variability in the frequency domain in two underweight groups, one of which was undernourished and recruited from the lower socio-economic strata [underweight, undernourished (UW/UN); n = 15], while the other was from a high class of socio-economic background [underweight, well nourished (UW/WN); n = 17], as well as in normal-weight controls [normal weight, well nourished (NW/WN); n = 27]. Baroreflex sensitivity, which is a determinant of heart rate variability, was also assessed. The data indicate that total power (0–0.4Hz), low-frequency power (0.04–0.15Hz) and high-frequency power (0.15–0.4Hz) of RR interval variability were significantly lower in the UW/UN subjects (P<0.05) than in the NW/WN controls when expressed in absolute units, but not when the low- and high-frequency components were normalized for total power. Baroreflex sensitivity was similarly lower in the UW/UN group (P<0.05). Heart rate variability parameters in the UW/WN group were generally between those of the UW/UN and NW/WN groups, but were not statistically different from either. The mechanisms that contribute to the observed differences between undernourished and normal-weight groups, and the implications of these differences, remain to be elucidated.

Effect of n-3 fatty acids on heart rate variability and baroreflex sensitivity in middle-aged subjects

2003 ◽  
Vol 146 (2) ◽  
pp. 344 ◽  
Author(s):  
Anouk Geelen ◽  
Peter L Zock ◽  
Cees A Swenne ◽  
Ingeborg A Brouwer ◽  
Evert G Schouten ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Baroreflex Sensitivity ◽  
Middle Aged ◽  
Aged Subjects

scholarly journals Effects of Respiratory Training on Heart Rate Variability and Baroreflex Sensitivity in Individuals With Chronic Spinal Cord Injury

2018 ◽  
Vol 99 (3) ◽  
pp. 423-432 ◽  
Author(s):  
Bonnie E. Legg Ditterline ◽  
Sevda C. Aslan ◽  
David C. Randall ◽  
Susan J. Harkema ◽  
Camilo Castillo ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Heart Rate ◽  
Spinal Cord Injury ◽  
Heart Rate Variability ◽  
Baroreflex Sensitivity ◽  
Chronic Spinal Cord Injury ◽  
Cord Injury ◽  
Respiratory Training

scholarly journals Autonomic and endothelial dysfunction with neurocirculatory asthenia in young men of call-up age

2019 ◽  
Vol 10 (2) ◽  
pp. 27-31
Author(s):  
Vladimir S. Ivanov ◽  
Lilia I. Levina ◽  
Sergey N. Ivanov ◽  
Vladimir S. Vasilenko
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Endothelial Dysfunction ◽  
Cardiac Activity ◽  
Young Men ◽  
Mean Value ◽  
Regulation Type ◽  
Vasodilator Reserve ◽  
Vegetative Regulation

Young men of call-up age with neurocirculatory were asthenia were examined for autonomic regulation of cardiac activity and vasodilatory reserve of the arteries. The functional state of the autonomic nervous system (ANS) was studied with the aid of rythmography with analyse of heart rate variability. The following parameters were studied: vegetative regulation type, responsiveness of departments of ANS and autonomic provision of cardiac activity. The type of vegetative regulation was determined by the mean value of RR interval and indication of the heart rate variability (∆RR). Reactivity of parasympathetic and sympathetic divisions of the ANS and autonomic support of cardiac activity were investigated using breathing test. To ensure vegetative dysadaptation cardiac activity includes reaction with low vegetative coverage of both divisions of the ANS and paradoxical reaction in which there is a decrease in ∆RRmax (instead of increase) and an increase in ∆RRmin instead of decrease. These reactions indicate autonomic dysfunction. Vasodilatory reserve of the arteries was investigated using ultrasonography of the brachial artery with compressive sample and determination of endothelium-dependent vasodilation. It was found that in boys with neurocirculatory asthenia vagotonic and sympathetic types of vegetative regulation are often determined by disadaptative vegetative provision of cardiac activity, which is accompanied by endothelial dysfunction with reduced vasodilator reserve of the arteries.

Baroreflex sensitivity and heart-rate variability in prediction of total cardiac mortality after myocardial infarction

The Lancet ◽  
1998 ◽  
Vol 351 (9101) ◽  
pp. 478-484 ◽  
Author(s):  
Maria Teresa La Rovere ◽  
J Thomas Bigger ◽  
Frank I Marcus ◽  
Andrea Mortara ◽  
Peter J Schwartz
Keyword(s):  
Myocardial Infarction ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Baroreflex Sensitivity ◽  
Cardiac Mortality

Sequential analysis of heart rate variability, blood pressure variability and baroreflex sensitivity in healthy pregnancy

2020 ◽  
Vol 30 (5) ◽  
pp. 433-439 ◽  
Author(s):  
Priyanka Garg ◽  
Kavita Yadav ◽  
Ashok Kumar Jaryal ◽  
Garima Kachhawa ◽  
Alka Kriplani ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Blood Pressure Variability ◽  
Sequential Analysis ◽  
Baroreflex Sensitivity ◽  
Healthy Pregnancy

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.

Controlled 5-mo aerobic training improves heart rate but not heart rate variability or baroreflex sensitivity

2000 ◽  
Vol 89 (5) ◽  
pp. 1825-1829 ◽  
Author(s):  
Antti Loimaala ◽  
Heikki Huikuri ◽  
Pekka Oja ◽  
Matti Pasanen ◽  
Ilkka Vuori
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Exercise Training ◽  
High Intensity ◽  
Baroreflex Sensitivity ◽  
Aerobic Training ◽  
Control Group ◽  
Resting Heart Rate ◽  
Endurance Time ◽  
Low Intensity

Endurance-trained athletes have increased heart rate variability (HRV), but it is not known whether exercise training improves the HRV and baroreflex sensitivity (BRS) in sedentary persons. We compared the effects of low- and high-intensity endurance training on resting heart rate, HRV, and BRS. The maximal oxygen uptake and endurance time increased significantly in the high-intensity group compared with the control group. Heart rate did not change significantly in the low-intensity group but decreased significantly in the high-intensity group (−6 beats/min, 95% confidence interval; −10 to −1 beats/min, exercise vs. control). No significant changes occurred in either the time or frequency domain measures of HRV or BRS in either of the exercise groups. Exercise training was not able to modify the cardiac vagal outflow in sedentary, middle-aged persons.

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