The correlation between heart period variability and mean period length

1992 ◽  
Vol 11 (1) ◽  
pp. 125-129 ◽  
Author(s):  
J. L. Fleiss ◽  
J. T. Bigger ◽  
L. M. Rolnitzky
Keyword(s):  
Period Length ◽  
Heart Period ◽  
Heart Period Variability ◽  
Period Variability

Effects of Fear Induction on Heart Period Variability

1999 ◽  
Vol 13 (1) ◽  
pp. 18-26 ◽  
Author(s):  
Rudolf Stark ◽  
Alfons Hamm ◽  
Anne Schienle ◽  
Bertram Walter ◽  
Dieter Vaitl
Keyword(s):  
Blood Pressure ◽  
Trait Anxiety ◽  
State Anxiety ◽  
Self Report ◽  
Emotional States ◽  
Heart Period ◽  
Experimental Conditions ◽  
Heart Period Variability ◽  
Physiological Variables ◽  
Period Variability

Abstract The present study investigated the influence of contextual fear in comparison to relaxation on heart period variability (HPV), and analyzed differences in HPV between low and high anxious, nonclinical subjects. Fifty-three women participated in the study. Each subject underwent four experimental conditions (control, fear, relaxation, and a combined fear-relaxation condition), lasting 10 min each. Fear was provoked by an unpredictable aversive human scream. Relaxation should be induced with the aid of verbal instructions. To control for respiratory effects on HPV, breathing was paced at 0.2 Hz using an indirect light source. Besides physiological measures (HPV measures, ECG, respiration, forearm EMG, blood pressure), emotional states (pleasure, arousal, dominance, state anxiety) were assessed by subjects' self-reports. Since relaxation instructions did not have any effect neither on the subjective nor on the physiological variables, the present paper focuses on the comparison of the control and the fear condition. The scream reliably induced changes in both physiological and self-report measures. During the fear condition, subjects reported more arousal and state anxiety as well as less pleasure and dominance. Heart period decreased, while EMG and diastolic blood pressure showed a tendency to increase. HPV remained largely unaltered with the exception of the LF component, which slightly decreased under fear induction. Replicating previous findings, trait anxiety was negatively associated with HPV, but there were no treatment-specific differences between subjects with low and high trait anxiety.

Monitoring heart period variability changes during seizures. I. Methods

1990 ◽  
Vol 3 (1) ◽  
pp. 47-54 ◽  
Author(s):  
John A. Messenheimer ◽  
Stephen R. Quint ◽  
Michael B. Tennison ◽  
Pattye Keaney
Keyword(s):  
Heart Period ◽  
Heart Period Variability ◽  
Period Variability

Temporal asymmetries of short-term heart period variability are linked to autonomic regulation

2008 ◽  
Vol 295 (2) ◽  
pp. R550-R557 ◽  
Author(s):  
A. Porta ◽  
K. R. Casali ◽  
A. G. Casali ◽  
T. Gnecchi-Ruscone ◽  
E. Tobaldini ◽  
...  
Keyword(s):  
Autonomic Regulation ◽  
Heart Period ◽  
Short Term ◽  
Time Reversibility ◽  
Heart Period Variability ◽  
Period Variability ◽  
Healthy Humans ◽  
Inclination Angles ◽  
Head Up Tilt ◽  
Important Shift

We exploit time reversibility analysis, checking the invariance of statistical features of a series after time reversal, to detect temporal asymmetries of short-term heart period variability series. Reversibility indexes were extracted from 22 healthy fetuses between 16th to 40th wk of gestation and from 17 healthy humans (aged 21 to 54, median = 28) during graded head-up tilt with table inclination angles randomly selected inside the set {15, 30, 45, 60, 75, 90}. Irreversibility analysis showed that nonlinear dynamics observed in short-term heart period variability are mostly due to asymmetric patterns characterized by bradycardic runs shorter than tachycardic ones. These temporal asymmetries were 1) more likely over short temporal scales than over longer, dominant ones; 2) more frequent during the late period of pregnancy (from 25th to 40th week of gestation); 3) significantly present in healthy humans at rest in supine position; 4) more numerous during 75 and 90° head-up tilt. Results suggest that asymmetric patterns observable in short-term heart period variability might be the result of a fully developed autonomic regulation and that an important shift of the sympathovagal balance toward sympathetic predominance (and vagal withdrawal) can increase their presence.

The Effects of Pharmacological Manipulations that Influence Vagal Control of the Heart on Heart Period, Heart-Period Variability and Respiration in Rats

1982 ◽  
Vol 19 (4) ◽  
pp. 426-432 ◽  
Author(s):  
Brandon G. Yongue ◽  
Philip M. McCabe ◽  
Stephen W. Porges ◽  
Margaret Rivera ◽  
Susan L. Kelley ◽  
...  
Keyword(s):  
Heart Period ◽  
Heart Period Variability ◽  
Vagal Control ◽  
Period Variability ◽  
Pharmacological Manipulations

Monitoring heart period variability changes during seizures. II. Diversity and trends

1996 ◽  
Vol 9 (1) ◽  
pp. 27-34 ◽  
Author(s):  
Bradley V. Vaughn ◽  
Stephen R. Quint ◽  
Michael B. Tennison ◽  
John A. Messenheimer
Keyword(s):  
Heart Period ◽  
Heart Period Variability ◽  
Period Variability

scholarly journals Conditional Self-Entropy and Conditional Joint Transfer Entropy in Heart Period Variability during Graded Postural Challenge

PLoS ONE ◽  
2015 ◽  
Vol 10 (7) ◽  
pp. e0132851 ◽  
Author(s):  
Alberto Porta ◽  
Luca Faes ◽  
Giandomenico Nollo ◽  
Vlasta Bari ◽  
Andrea Marchi ◽  
...  
Keyword(s):  
Transfer Entropy ◽  
Heart Period ◽  
Heart Period Variability ◽  
Period Variability ◽  
Postural Challenge
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