Results 211 to 220 of about 36,230 (266)
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Respiratory Sinus Arrhythmia of Brainstem Lesions
Journal of Child Neurology, 1999In this pilot study we investigated the hypothesis that intrinsic and extrinsic brainstem lesions situated within the pontomedullary region would effect the integrity of respiratory sinus arrhythmia. The study sample consisted of three patients with anatomic brainstem abnormalities associated with isolated Chiari I malformation, Chiari II malformation
F J, DiMario, L, Bauer, D, Baxter
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Individual differences in respiratory sinus arrhythmia
American Journal of Physiology-Heart and Circulatory Physiology, 2004To investigate the interindividual differences in respiratory sinus arrhythmia (RSA), recordings of ventilation and electrocardiogram were obtained from 12 healthy subjects for five imposed breathing periods ( TTOT) surrounding each individual's spontaneous breathing period.
Samia, Ben Lamine +5 more
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Self-regulation of respiratory sinus arrhythmia
Biofeedback and Self-Regulation, 1992Respiratory sinus arrhythmia (RSA)--the peak-to-peak variations in heart rate caused by respiration--can be used as a noninvasive measure of parasympathetic cardiac control. In the present study four strategies to increase RSA amplitude are investigated: (1) biofeedback of RSA amplitude, (2) biofeedback of RSA amplitude plus respiratory instructions ...
G A, Reyes del Paso, J, Godoy, J, Vila
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Respiratory Sinus Arrhythmia in Blood Phobic Subjects
Perceptual and Motor Skills, 199712 blood-phobic subjects, selected according to the Feat Survey Schedule and the Mutilation Questionnaire, and 50 control subjects performed a paced respiration task during which heart rate and respiration were recorded. Respiratory Sinus Arrhythmia (RSA) was analyzed as an autonomic index of vagal influence on the heart.
ANGRILLI, ALESSANDRO +4 more
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Respiratory Sinus Arrhythmia and Chaos
2008 2nd International Conference on Bioinformatics and Biomedical Engineering, 2008To investigate the chaotic characteristic of respiratory sinus arrhythmia and nonlinearity in heart rate variability (HRV), two kinds of voluntary breathing, namely, paced breathing and breath-holding, were compared with spontaneous breathing. High frequency component (HF) and its band width of HRV were changed according to respiratory patterns ...
J.-T. Sun +4 more
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Respiratory sinus arrhythmia from two coupled pacemakers
Biosystems, 2001We reproduce global features of respiratory sinus arrhythmia (RSA), a prominent source of heart rate variability, from two signals coupled in alternate fashion so dominance periodically switches back and forth between them. We consider two different possibilities for this coupling and illustrate our method with numerical simulations that we contrast ...
J A, Christen, G, Ruiz, J L, Torres
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Variation of respiratory sinus arrhythmia with age
Journal of Applied Physiology, 1976Respiratory sinus arrhythmia was measured on 24 male subjects whose agesranged from 21 to 65 yr, using a technique in which respiration was coupledto heart rate, so that there were 6 heartbeats per inspiration and 6 heartbeats per expiration. This voluntary cardiorespiratory coupling reduced the variance of heart rates measured at various points in ...
J B, Hellman, R W, Stacy
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Respiratory sinus arrhythmia in the human fetus
American Journal of Obstetrics and Gynecology, 1985This study explores the relationship between fetal heart rate variability and fetal breathing movements in the term fetus. Fourier analysis was applied to fetal heart rate variability during fetal breathing and nonbreathing episodes. A distinct component in the order of 0.7 to 0.95 Hz was demonstrated in fetal heart rate variability during breathing ...
M Y, Divon +5 more
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Model of respiratory sinus arrhythmia in man
Medical & Biological Engineering & Computing, 1989The first section of the model delineates the parasympathetic signal as a function of the interaction between the respiratory and the vagal neurones of the common brainstem network. The second section is a version of Chess and Calaresu's description of the vagus/heart period system in the sympathetically blocked cat.
R M, Negoescu, I E, Csiki
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Respiratory phase, respiratory sinus arrhythmia and performance
2023No description ...
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