Results 221 to 230 of about 36,230 (266)

Acute Intracranial Lesions and Respiratory Sinus Arrhythmia

Archives of Neurology, 1992
We 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
openaire   +2 more sources

Respiratory Sinus Arrhythmia and Central Respiratory Drive in Humans

Clinical Science, 1996
1. The influence of central inspiratory drive on heart rate variability was investigated in young human subjects using power spectral analysis of R—R intervals. 2. The area of the high-frequency component occurring at the respiratory frequency (0.2–0.25 Hz) in the power spectral density curves was used as an index of respiratory sinus ...
M, Al-Ani, A S, Forkins, J N, Townend, J H, Coote   +3 more
openaire   +2 more sources

Respiratory Sinus Arrhythmia

Circulation, 1996
Background The primary mechanisms of respiratory sinus arrhythmia (RSA) are understood to be the modulation of cardiac vagal efferent activity by the central respiratory drive and the lung inflation reflex, and the degree of RSA increases with cardiac vagal activity.
J, Hayano, F, Yasuma, A, Okada, S, Mukai, T, Fujinami   +4 more
openaire   +2 more sources

Respiratory Sinus Arrhythmia in Cluster Headache Syndrome

Headache: The Journal of Head and Face Pain, 1993
SYNOPSIS 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
openaire   +2 more sources

Adaptive cancellation of respiratory sinus arrhythmia

[1990] Proceedings Computers in Cardiology, 2002
The influence of respiration is considered as added interference in the heart rate variation (HRV). The temperature of the nasal air flow is recorded and used as a respiratory signal. Given the signal, the respiratory influence is separated from the simultaneously recorded HRV by means of an adaptive noise canceling algorithm. This method has been used
U. Wiklund, U. Niklasson, P. Bjerle
openaire   +1 more source

A Minimal Model for the Respiratory Sinus Arrhythmia

Biological Cybernetics, 2006
The cardiac and respiratory rhythms in humans are known to be coupled by several mechanisms. In particular, the first rhythm is deeply modulated by the second. In this report we propose a simple operational model for heart rate variability which, taking such modulation into account, reproduces the main features of some experimental sequences of RR ...
Barbi M, Chillemi S, Di Garbo A, Balocchi R, Menicucci D   +4 more
openaire   +3 more sources

Analysis of Respiratory Sinus Arrhythmia with Respect to Respiratory Phase

Methods of Information in Medicine, 2000
Abstract:We evaluated the respiratory modulation of heart rate, i.e., respiratory sinus arrhythmia (RSA), with respect to respiratory phase derived from an analytic signal from the lung volume curve, during spontaneous breathing and paced breathing with different patterns.
K, Kotani, I, Hidaka, Y, Yamamoto, S, Ozono   +3 more
openaire   +2 more sources

Respiratory Sinus Arrhythmia Predicts Restricted Repetitive Behavior Severity

Journal of Autism and Developmental Disorders, 2017
In addition to social communication deficits, restricted repetitive behaviors (RRBs) are a key diagnostic feature of autism spectrum disorder (ASD). Dysfunction of the autonomic nervous system (ANS) in ASD has been posited as a mechanism of RRBs; however, most studies investigating ANS activity in ASD have focused on its relation to social functioning.
Emma E, Condy, Angela, Scarpa, Bruce H, Friedman   +2 more
openaire   +2 more sources

Nonlinear Interpretation of Respiratory Sinus Arrhythmia in Anesthesia

Methods of Information in Medicine, 1994
Abstract: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, T, Lipping, V, Jäntti, A, Yli-Hankala   +3 more
openaire   +2 more sources

Modulation of Respiratory Sinus Arrhythmia by Breathing Pattern

Clinical Science, 1996
Respiratory sinus arrhythmia (RSA) of healthy humans is dependent on multiple factors like heart rate itself, blood pressure, stroke volume and sympatho-vagal tone. Respiration is a dominant factor causing an extended variability of heart rate, and is frequently used for testing the status of autonomic nervous system [I].
C, Haggenmiller, J H, Baumert, M, Adt, A W, Frey   +3 more
openaire   +2 more sources