scholarly journals Water drinking enhances the gain of arterial baroreflex control of muscle sympathetic nerve activity in healthy young humans

2018 ◽  
Vol 103 (10) ◽  
pp. 1318-1325 ◽  
Author(s):  
Lauro C. Vianna ◽  
Igor A. Fernandes ◽  
Daniel G. Martinez ◽  
André L. Teixeira ◽  
Bruno M. Silva ◽  
...  
Keyword(s):  
Sympathetic Nerve ◽  
Sympathetic Nerve Activity ◽  
Muscle Sympathetic Nerve Activity ◽  
Arterial Baroreflex ◽  
Nerve Activity ◽  
Baroreflex Control ◽  
Water Drinking

scholarly journals Water drinking enhances the gain of arterial baroreflex control of muscle sympathetic nerve activity in healthy humans

2013 ◽  
Vol 27 (S1) ◽  
Author(s):  
Lauro C Vianna ◽  
Igor A Fernandes ◽  
Daniel G Martinez ◽  
Bruno M Silva ◽  
Paul J Fadel ◽  
...  
Keyword(s):  
Sympathetic Nerve ◽  
Sympathetic Nerve Activity ◽  
Muscle Sympathetic Nerve Activity ◽  
Arterial Baroreflex ◽  
Nerve Activity ◽  
Baroreflex Control ◽  
Water Drinking ◽  
Healthy Humans

scholarly journals Arterial Baroreflex Control of Multi‐ and Single‐Unit Muscle Sympathetic Nerve Activity in Young Unmedicated Hypertensives

2019 ◽  
Vol 33 (S1) ◽  
Author(s):  
Anthony V Incognito ◽  
Milena Samora ◽  
Andrew D Shepherd ◽  
Roberta A Cartafina ◽  
Gabriel MN Guimarães ◽  
...  
Keyword(s):  
Sympathetic Nerve ◽  
Single Unit ◽  
Sympathetic Nerve Activity ◽  
Muscle Sympathetic Nerve Activity ◽  
Arterial Baroreflex ◽  
Nerve Activity ◽  
Baroreflex Control

scholarly journals Exercise training prevents the deterioration in the arterial baroreflex control of sympathetic nerve activity in chronic heart failure patients

2015 ◽  
Vol 308 (9) ◽  
pp. H1096-H1102 ◽  
Author(s):  
Raphaela V. Groehs ◽  
Edgar Toschi-Dias ◽  
Ligia M. Antunes-Correa ◽  
Patrícia F. Trevizan ◽  
Maria Urbana P. B. Rondon ◽  
...  
Keyword(s):  
Heart Failure ◽  
Time Delay ◽  
Exercise Training ◽  
Arterial Pressure ◽  
Sympathetic Nerve ◽  
Sympathetic Nerve Activity ◽  
Muscle Sympathetic Nerve Activity ◽  
Arterial Baroreflex ◽  
Nerve Activity ◽  
Baroreflex Control

Arterial baroreflex control of muscle sympathetic nerve activity (ABRMSNA) is impaired in chronic systolic heart failure (CHF). The purpose of the study was to test the hypothesis that exercise training would improve the gain and reduce the time delay of ABRMSNA in CHF patients. Twenty-six CHF patients, New York Heart Association Functional Class II-III, EF ≤ 40%, peak V̇o2 ≤ 20 ml·kg−1·min−1 were divided into two groups: untrained (UT, n = 13, 57 ± 3 years) and exercise trained (ET, n = 13, 49 ± 3 years). Muscle sympathetic nerve activity (MSNA) was directly recorded by microneurography technique. Arterial pressure was measured on a beat-to-beat basis. Time series of MSNA and systolic arterial pressure were analyzed by autoregressive spectral analysis. The gain and time delay of ABRMSNA was obtained by bivariate autoregressive analysis. Exercise training was performed on a cycle ergometer at moderate intensity, three 60-min sessions per week for 16 wk. Baseline MSNA, gain and time delay of ABRMSNA, and low frequency of MSNA (LFMSNA) to high-frequency ratio (HFMSNA) (LFMSNA/HFMSNA) were similar between groups. ET significantly decreased MSNA. MSNA was unchanged in the UT patients. The gain and time delay of ABRMSNA were unchanged in the ET patients. In contrast, the gain of ABRMSNA was significantly reduced [3.5 ± 0.7 vs. 1.8 ± 0.2, arbitrary units (au)/mmHg, P = 0.04] and the time delay of ABRMSNA was significantly increased (4.6 ± 0.8 vs. 7.9 ± 1.0 s, P = 0.05) in the UT patients. LFMSNA-to-HFMSNA ratio tended to be lower in the ET patients ( P < 0.08). Exercise training prevents the deterioration of ABRMSNA in CHF patients.

scholarly journals Arterial baroreflex control of muscle sympathetic nerve activity during dynamic exercise in humans

2007 ◽  
Vol 21 (5) ◽  
Author(s):  
Shigehiko Ogoh ◽  
James P Fisher ◽  
Paul J Fadel ◽  
Peter B Raven
Keyword(s):  
Sympathetic Nerve ◽  
Sympathetic Nerve Activity ◽  
Muscle Sympathetic Nerve Activity ◽  
Dynamic Exercise ◽  
Arterial Baroreflex ◽  
Nerve Activity ◽  
Baroreflex Control ◽  
Exercise In Humans

Hyperventilation alters arterial baroreflex control of heart rate and muscle sympathetic nerve activity

2000 ◽  
Vol 279 (2) ◽  
pp. H536-H541 ◽  
Author(s):  
Philippe Van de Borne ◽  
Silvia Mezzetti ◽  
Nicola Montano ◽  
Krzysztof Narkiewicz ◽  
Jean Paul Degaute ◽  
...  
Keyword(s):  
Heart Rate ◽  
Sympathetic Nerve ◽  
Baroreflex Sensitivity ◽  
Sympathetic Nerve Activity ◽  
Muscle Sympathetic Nerve Activity ◽  
Normal Subjects ◽  
Arterial Baroreflex ◽  
Baroreceptor Sensitivity ◽  
Nerve Activity ◽  
Baroreflex Control

Interactions between mechanisms governing ventilation and blood pressure (BP) are not well understood. We studied in 11 resting normal subjects the effects of sustained isocapnic hyperventilation on arterial baroreceptor sensitivity, determined as the α index between oscillations in systolic BP (SBP) generated by respiration and oscillations present in R-R intervals (RR) and in peripheral sympathetic nerve traffic [muscle sympathetic nerve activity (MSNA)]. Tidal volume increased from 478 ± 24 to 1,499 ± 84 ml and raised SBP from 118 ± 2 to 125 ± 3 mmHg, whereas RR decreased from 947 ± 18 to 855 ± 11 ms (all P < 0.0001); MSNA did not change. Hyperventilation reduced arterial baroreflex sensitivity to oscillations in SBP at both cardiac (from 13 ± 1 to 9 ± 1 ms/mmHg, P < 0.001) and MSNA levels (by −37 ± 5%, P < 0.0001). Thus increased BP during hyperventilation does not elicit any reduction in either heart rate or MSNA. Baroreflex modulation of RR and MSNA in response to hyperventilation-induced BP oscillations is attenuated. Blunted baroreflex gain during hyperventilation may be a mechanism that facilitates simultaneous increases in BP, heart rate, and sympathetic activity during dynamic exercise and chemoreceptor activation.

Arterial baroreflex control of sympathetic nerve activity during acute hypotension: effect of fitness

2001 ◽  
Vol 280 (6) ◽  
pp. H2524-H2532 ◽  
Author(s):  
P. J. Fadel ◽  
M. Stromstad ◽  
J. Hansen ◽  
M. Sander ◽  
K. Horn ◽  
...  
Keyword(s):  
Sympathetic Nerve ◽  
Vascular Reactivity ◽  
Sympathetic Nerve Activity ◽  
Muscle Sympathetic Nerve Activity ◽  
Arterial Baroreflex ◽  
Nerve Activity ◽  
Baroreflex Control ◽  
Carotid Baroreflex ◽  
Acute Hypotension ◽  
Average Fitness

We examined arterial baroreflex control of muscle sympathetic nerve activity (MSNA) during abrupt decreases in mean arterial pressure (MAP) and evaluated whether endurance training alters baroreflex function. Acute hypotension was induced nonpharmacologically in 14 healthy subjects, of which 7 were of high fitness (HF) and 7 were of average fitness (AF), by releasing a unilateral arterial thigh cuff after 9 min of resting ischemia under two conditions: control, which used aortic and carotid baroreflex (ABR and CBR, respectively) deactivation; and suction, which used ABR deactivation alone. The application of neck suction to counteract changes in carotid sinus transmural pressure during cuff release significantly attenuated the MSNA response (which increased 134 ± 32 U/14 s) compared with control (which increased 195 ± 43 U/14 s) and caused a greater decrease in MAP (19 ± 2 vs. 15 ± 2 mmHg; P < 0.05). Furthermore, during both trials, the HF subjects exhibited a greater decrease in MAP compared with AF subjects despite an augmented baroreflex control of MSNA. These data indicate that the CBR contributes importantly to the MSNA response during acute systemic hypotension. Additionally, we suggest that an impaired control of vascular reactivity hinders blood pressure regulation in HF subjects.

P-42 Arterial Baroreflex Control of Single-Unit Muscle Sympathetic Nerve Activity in Chronic Heart Failure with Atrial Fibrillation

2009 ◽  
Vol 4 ◽  
pp. S64
Author(s):  
Tatsunori Ikeda ◽  
Masayuki Takamura ◽  
Hisayoshi Murai ◽  
Jyunichirou Inomata ◽  
Daisuke Kobayashi ◽  
...  
Keyword(s):  
Heart Failure ◽  
Atrial Fibrillation ◽  
Chronic Heart Failure ◽  
Sympathetic Nerve ◽  
Single Unit ◽  
Sympathetic Nerve Activity ◽  
Muscle Sympathetic Nerve Activity ◽  
Arterial Baroreflex ◽  
Nerve Activity ◽  
Baroreflex Control
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