Results 211 to 220 of about 33,582 (248)
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Aging as a Modulator of Respiratory Sinus Arrhythmia
Journal of Gerontology, 1993Aging is associated with an accentuated shift toward sympathetic outflow. Evidence suggests that sympathetic and vagal-cardiac activity change reciprocally. If this hypothesis is correct, then aging would result in an attenuation of vagal-cardiac activity.
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Nonlinear Interpretation of Respiratory Sinus Arrhythmia in Anesthesia
Methods of Information in Medicine, 1994Abstract:A non-parametric method is presented for modelling nonlinear dynamic mechanisms of respiratory sinus arrhythmia (RSA) in anesthesia caused by positive pressure ventilation. RR interval sequences are shown with Tsay’s linearity test to contain both short-term and long-term nonlinear components, which cannot completely be modelled with optimal ...
P, Loula +3 more
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Acute effects of bisoprolol on respiratory sinus arrhythmia
Fundamental & Clinical Pharmacology, 1998Summary— Respiratory sinus arrhythmia (RSA) is often quantified by computing the spectra of heart period (HP) or of its reciprocal heart rate (HR) at the respiratory frequency. This study was undertaken to describe the effect of an acute beta‐blockade achieved with bisoprolol on RSA, obtained during a calibrated breathing (breathing frequency 0.25 Hz ...
M, Wargon +3 more
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Determinants of respiratory sinus arrhythmia in the vagotomized rabbit
American Journal of Physiology-Heart and Circulatory Physiology, 1995After cardiac denervation, a small-amplitude respiratory sinus arrhythmia (RSA) has been described in animals and humans. Its mechanical and chemical determinants were investigated in 19 urethan-anesthetized, vagotomized, and mechanically ventilated rabbits. We measured the influence on RSA of arterial blood gases, beta-adrenergic blockade, and phasic
PERLINI, STEFANO +6 more
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Respiratory sinus arrhythmia as a measure of cognitive workload
International Journal of Psychophysiology, 2012The current standard for measuring cognitive workload is the NASA Task-load Index (TLX) questionnaire. Although this measure has a high degree of reliability, diagnosticity, and sensitivity, a reliable physiological measure of cognitive workload could provide a non-invasive, objective measure of workload that could be tracked in real or near real-time ...
Eric R, Muth +4 more
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Interoception and respiratory sinus arrhythmia in gambling disorder
Psychophysiology, 2019AbstractGambling has longstanding links with excitement and physiological arousal, but prior research has not considered (a) gamblers’ ability to detect internal physiological signals, or (b) markers of parasympathetic functioning. The present study measured interoception in individuals with gambling disorder, using self‐report measures and a heartbeat
Dawn Kennedy +5 more
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Respiratory Sinus Arrhythmia in Cluster Headache Syndrome
Headache: The Journal of Head and Face Pain, 1993SYNOPSIS Respiratory sinus arrhythmia is regarded as indicative of cardiac vagal integrity. A ratio of the longest R‐R interval to the shortest R‐R interval during deep breathing test (E:I ratio) was calculated in controls (n=49), cluster headache (n=33) and CPH (n=4) patients, E:I ratio decreased with age but was
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Paradoxical respiratory sinus arrhythmia in the anesthetized rat
Autonomic Neuroscience, 2005This study examines respiratory sinus arrhythmia (RSA) in the isoflurane-anesthetized rat. In fifteen female Sprague-Dawley rats, we recorded continuous ECG and respiratory airflow before and after bilateral vagotomy. RSA was assessed using power spectral analysis and by plotting the normalised changes in heart period as a function of the time during ...
Yu-Chieh, Tzeng +2 more
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Acute Intracranial Lesions and Respiratory Sinus Arrhythmia
Archives of Neurology, 1992We studied the effects of acute intracranial lesions on the respiratory sinus arrhythmia (RSA) with the use of computerized measurements of the ratio of expiratory to inspiratory R-R intervals. The RSA was reduced below the 95th percentile for age in 20 of 27 patients, an average of 2 days after an acute event.
J I, Frank, A H, Ropper, G, Zuñiga
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Respiratory sinus arrhythmia in the denervated human heart
Journal of Applied Physiology, 1989We performed this study to test whether the denervated human heart has the ability to manifest respiratory sinus arrhythmia (RSA). With the use of a highly sensitive spectral analysis technique (cross correlation) to define beat-to-beat coupling between respiratory frequency and heart rate period (R-R) and hence RSA, we compared the effects of ...
BERNARDI, LUCIANO +6 more
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