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Titolo:
Noise-enhanced heart rate and sympathetic nerve responses to oscillatory lower body negative pressure in humans
Autore:
Hidaka, I; Ando, S; Shigematsu, H; Sakai, K; Setoguchi, S; Seto, T; Hirooka, Y; Takeshita, A; Yamamoto, Y;
Indirizzi:
Univ Tokyo, Grad Sch Educ, Educ Physiol Lab, Bunkyo Ku, Tokyo 1130033, Japan Univ Tokyo Tokyo Japan 1130033 siol Lab, Bunkyo Ku, Tokyo 1130033, Japan Saiseikai Futsukaichi Hosp, Div Cardiol, Fukuoka 8188516, Japan Saiseikai Futsukaichi Hosp Fukuoka Japan 8188516 Fukuoka 8188516, Japan Kyushu Univ, Grad Sch Med Sci, Angiocardiol Res Inst, Fukuoka 8128582, Japan Kyushu Univ Fukuoka Japan 8128582 rdiol Res Inst, Fukuoka 8128582, Japan
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 2, volume: 86, anno: 2001,
pagine: 559 - 564
SICI:
0022-3077(200108)86:2<559:NHRASN>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
STOCHASTIC RESONANCE; VASOCONSTRICTOR RESPONSES; SYSTEM; BRAIN; MECHANORECEPTORS; BARORECEPTORS; ACTIVATION; BAROREFLEX; CRAYFISH; NEURONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Yamamoto, Y Univ Tokyo, Grad Sch Educ, Educ Physiol Lab, Bunkyo Ku, 7-3-1 Hongo, Tokyo1130033, Japan Univ Tokyo 7-3-1 Hongo Tokyo Japan 1130033 okyo1130033, Japan
Citazione:
I. Hidaka et al., "Noise-enhanced heart rate and sympathetic nerve responses to oscillatory lower body negative pressure in humans", J NEUROPHYS, 86(2), 2001, pp. 559-564

Abstract

By injecting noise into the carotid sinus baroreceptors, we previously showed that heart rate (HR) responses to weak oscillatory tilt were enhanced via a mechanism known as "stochastic resonance. " It remains unclear, however, whether the same responses would be observed when using oscillatory lowerbody negative pressure (LBNP), which would unload the cardiopulmonary baroreceptors with physically negligible effects on the arterial system. Also, the vasomotor sympathetic activity directly controlling peripheral resistance against hypotensive stimuli was not observed. We therefore investigated the effects of weak (0 to approximately -10 mmHg) oscillatory (0.03 Hz) LBNP on HR and muscle sympathetic nerve activity (MSNA) while adding incremental noise to the carotid sinus baroreceptors via a pneumatic neck chamber. The signal-to-noise ratio of HR, cardiac interbeat interval, and total MSNA were all significantly improved by increasing noise intensity, while there was no significant change in the arterial blood pressure in synchronized with the oscillatory LBNP. We conclude that the stochastic resonance, affecting both HR and MSNA, results from the interaction of noise with the signal in the brain stem, where the neuronal inputs from the arterial and cardiopulmonary baroreceptors first come together in the nucleus tractus solitarius. Also, these results indicate that the noise could induce functional improvement in human blood pressure regulatory system in overcoming given hypotensive stimuli.

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Documento generato il 20/09/20 alle ore 07:24:21