Results 231 to 240 of about 194,646 (286)

Model of respiratory sinus arrhythmia in man

Medical & Biological Engineering & Computing, 1989
The 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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Individual differences in respiratory sinus arrhythmia

American Journal of Physiology-Heart and Circulatory Physiology, 2004
To 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, Pascale, Calabrese, Hélène, Perrault, Tuan Pham, Dinh, André, Eberhard, Gila, Benchetrit   +5 more
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Self-regulation of respiratory sinus arrhythmia

Biofeedback and Self-Regulation, 1992
Respiratory 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 the human fetus

American Journal of Obstetrics and Gynecology, 1985
This 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, S Y, Yeh, E Z, Zimmer, L D, Platt, E, Paldi, R H, Paul   +5 more
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A case of sinus arrhythmia

American Heart Journal, 1929
Summary A case is reported in which a hitherto undescribed form of cardiac arrhythmia appears. Under normal respiratory conditions retardation of the heart occurs with each second respiration. Simultaneous electrocardiographic and respiratory tracings are shown, and a discussion of the mechanism involved is presented.
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Sinus arrhythmia in the dog

American Journal of Physiology-Legacy Content, 1966
R L, Hamlin, C R, Smith, D L, Smetzer
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Sinus arrhythmia and training

IPO Annual Progress Report, 1968
No abstract.
Koster, W.G., Ivens, E.
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Q-T interval in sinus arrhythmia

Journal of Electrocardiology, 1981
Summary The Bazett equation is modified for calculating the “corrected Q-T” in children with sinus arrhythmia.
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Do You Believe in Sinus Arrhythmia?

Ergonomics, 1973
Some problems raised by the use of heart rate irregularity as a dependent variable in experiments are mentioned. Referring to experimental results it is argued that mental load is not an indivisible concept. In laboratory studies a binary choice task is often used in order to provide the level of mental load as an independent variable This kind of task
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Cardiac Sinus Arrhythmias

2018
Sinus bradycardia and tachycardia are regular heart rhythms with unusual rate. In most cases, they are physiologic or secondary to another process and virtually never require direct treatment.
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