Informational and statistical measures of the self-organization of the heart regulation systems in the analysis of heart rate variability

2017 ◽  
Vol 43 (3) ◽  
pp. 339-344 ◽  
Author(s):  
A. V. Ilyakhinskiy ◽  
P. A. Pakhomov ◽  
M. A. Anufriev ◽  
I. V. Mukhina
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
The Self ◽  
Self Organization ◽  
Statistical Measures

scholarly journals A novel approach in heart-rate-variability analysis

2021 ◽  
Author(s):  
Andras Buzas ◽  
Tamas Horvath ◽  
Andras Der
Keyword(s):  
Heart Rate ◽  
Time Series ◽  
Heart Rate Variability ◽  
Extended Period ◽  
Evaluation Procedure ◽  
Heart Rate Variability Analysis ◽  
Daily Routine ◽  
Poincaré Plot ◽  
Statistical Measures ◽  
Registration Period

Heart-rate variability (HRV), measured by the fluctuation of beat-to-beat intervals, has been growingly considered the most important hallmark of heart rate (HR) time series. HRV can be characterized by various statistical measures both in the time and frequency domains, or by nonlinear methods. During the past decades, an overwhelming amount of HRV data has been piled up in the research community, but the individual results are difficult to reconcile due to the different measuring conditions and the usually HR-dependent statistical HRV-parameters applied. Moreover, the precise HR-dependence of HRV parameters is not known. Using data gathered by a wearable sensor of combined heart-rate and actigraphy modalities, here, we introduce a novel descriptor of HRV, based on a modified Poincare plot of 24-h RR-recordings. We show that there exists a regressive biexponential HRV versus HR master curve (M-curve) that is highly conserved for a healthy individual on short and medium terms (on the hours to months scale, respectively). At the same time, we reveal how this curve is related to age in the case of healthy people, and establish alterations of the M-curves of heart-attack patients. A stochastic neuron model accounting for the observed phenomena is also elaborated, in order to facilitate physiological interpretation of HRV data. Our novel evaluation procedure applied on the time series of interbeat intervals allows the description of the HRV(HR) function with unprecedented precision. To utilize the full strength of the method, we suggest a 24-hour-long registration period under natural, daily-routine circumstances (i.e., no special measuring conditions are required). By establishing a patient's M-curve, it is possible to monitor the development of his/her status over an extended period of time. On these grounds, the new method is suggested to be used as a competent tool in future HRV analyses for both clinical and training applications, as well as for everyday health promotion.

Effects of head-down bed rest on complex heart rate variability: response to LBNP testing

1994 ◽  
Vol 77 (6) ◽  
pp. 2863-2869 ◽  
Author(s):  
A. L. Goldberger ◽  
J. E. Mietus ◽  
D. R. Rigney ◽  
M. L. Wood ◽  
S. M. Fortney
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Frequency Domain ◽  
Lower Body Negative Pressure ◽  
Approximate Entropy ◽  
Bed Rest ◽  
Data Sets ◽  
Adult Women ◽  
Statistical Measures ◽  
Physiological Variability

Head-down bed rest is used to model physiological changes during spaceflight. We postulated that bed rest would decrease the degree of complex physiological heart rate variability. We analyzed continuous heart rate data from digitized Holter recordings in eight healthy female volunteers (age 28–34 yr) who underwent a 13-day 6 degree head-down bed rest study with serial lower body negative pressure (LBNP) trials. Heart rate variability was measured on 4-min data sets using conventional time and frequency domain measures as well as with a new measure of signal “complexity” (approximate entropy). Data were obtained pre-bed rest (control), during bed rest (day 4 and day 9 or 11), and 2 days post-bed rest (recovery). Tolerance to LBNP was significantly (P < 0.02) reduced on both bed rest days vs. pre-bed rest. Heart rate variability was assessed at peak LBNP. Heart rate approximate entropy was significantly (P < 0.05) decreased at day 4 and day 9 or 11, returning toward normal during recovery. Heart rate standard deviation and the ratio of high- to low-power frequency did not change significantly. We conclude that short-term bed rest is associated with a decrease in the complex variability of heart rate during LBNP testing in healthy young adult women. Measurement of heart rate complexity, using a method derived from nonlinear dynamics (“chaos theory”), may provide a sensitive marker of this loss of physiological variability, complementing conventional time and frequency domain statistical measures.

scholarly journals The Effects of Avoiding Instructions Under Pressure: An Examination of the Volleyball Serving Task

2021 ◽  
Vol 78 (1) ◽  
pp. 239-249
Author(s):  
Recep Gorgulu ◽  
Eslem Gokcek
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Repeated Measures ◽  
The Self ◽  
Target Zone ◽  
Repeated Measures Anova ◽  
Ironic Processes ◽  
Performance Error ◽  
Overall Performance ◽  
Practical Instruction

Abstract Wegner predicts that under pressure self-avoiding instructions not to perform in a certain manner will break down precisely where it is least desired that is the hypothesis of the present study. Specifically, the aim was to test the hypothesis that when instructed not to serve into a certain zone, ironic error would be more prevalent under pressure. Our sample comprised 43 female participants between the age of 13 and 16 (Mage = 14.51, SD = 1.35) who were active volleyball players (Mtraining years = 5.40, SD = 2.38). We measured the participants’ psychophysiological indications of anxiety via the heart rate, heart rate variability as well as the self-reported Mental Readiness Form-3. To measure performance, we counted the number of target and non-target serving zones under different anxiety conditions. Participants scored +5 points for serving into the target zone, scored -5 points for serving to the out or hitting the net and 1 point for serving into the court except the target zone. A 2 (anxiety) × 3 (serving zone) fully repeated measures ANOVA revealed a significant anxiety x serving zone interaction F (2, 84) = 36.52, p < .001. When instructed not to serve in a certain zone, players’ overall performance did not change across anxiety conditions t (42) = .68, p =.50. Results did not provide support for the Wegner’s theory as expected, but instead revealed evidence for the Woodman et al.’s (2015) differentiation of ironic performance error. The results demonstrate that the theory of ironic processes may account for practical instruction-based solution for reducing the susceptibility to ironic errors in the serving type of task in volleyball.

scholarly journals Trait Mindfulness Is Associated With the Self-Similarity of Heart Rate Variability

2019 ◽  
Vol 10 ◽  
Author(s):  
Shasha Sun ◽  
Chuanlin Hu ◽  
Junhao Pan ◽  
Chengyi Liu ◽  
Miner Huang
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
The Self ◽  
Trait Mindfulness ◽  
Self Similarity

Assessing heart rate variability through wavelet-based statistical measures

2016 ◽  
Vol 77 ◽  
pp. 222-230 ◽  
Author(s):  
Mark P. Wachowiak ◽  
Dean C. Hay ◽  
Michel J. Johnson
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Statistical Measures

scholarly journals Changes in Performance and Morning‐Measured Responses in Sport Rock Climbers

2019 ◽  
Vol 70 (1) ◽  
pp. 103-114 ◽  
Author(s):  
Artur Magiera ◽  
Robert Roczniok ◽  
Ewa Sadowska-Krępa ◽  
Katarzyna Kempa
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Grip Strength ◽  
Sleep Duration ◽  
Rock Climbing ◽  
Intermediate Level ◽  
The Self ◽  
Hand Grip ◽  
The Mean ◽  
Cortisol Ratio

Abstract The aim of this study was to determine changes in climbers’ hormonal, cardiovascular, neuromuscular, sleep and fatigue status, and their relationship with performance and workloads during a sport rock climbing camp. Mean difficulty of individual leading climbing routes (mean Difficulty) was calculated for six male, intermediate level sport rock climbers participating in a 2-week camp in Orpierre. Additionally, each morning climbers were tested for: cortisol (d-Cortisol) and testosterone (d-Testosterone) concentrations, testosterone/cortisol ratio (T/C), heart rate and heart rate variability in supine (d-L-HR, d-L-SD1, d-L-SD2) and standing positions (d-S-HR, d-S-SD1, d-S-SD2), difference in S-HR and L-HR (HR-S-L), maximal voluntary hand grip strength (MVC), sleep duration (Sleep) and the self-perception of fatigue (M-Fatigue). Only M-Fatigue and d-Testosterone did not change significantly during the camp. Changes in other variables were large and significant, especially in the second week of the camp when the mean Difficulty was > 70%. The greatest changes were noted on the last day, when T/C, HR-S-L, and Sleep decreased and d-Cortisol, d-L-HR, and d-SD1 increased. The monitoring of the uncoupling of neuromuscular, hormonal, and cardiovascular markers can be instrumental in determining the level of athletes’ morning fatigue and readiness during a climbing camp. An increase in d-Cortisol and a decrease in T/C and HR-S-L are relevant indicators of overreaching in sport climbers.

Heart rate variability predicts self‐control in goal pursuit

2009 ◽  
Vol 23 (8) ◽  
pp. 623-633 ◽  
Author(s):  
Fay C. M. Geisler ◽  
Thomas Kubiak
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Goal Pursuit ◽  
The Self ◽  
Intelligence Test ◽  
Self Control ◽  
Strength Model ◽  
Inhibitory Capacity ◽  
Self Confidence ◽  
Failure Experience

The aim of our study was to investigate the effects of a failure experience on the exercise of self‐control in goal pursuit. We hypothesized that tonic heart rate variability (tonic HRV), a possible physiological marker of inhibitory capacity, increases the exercise of self‐control in the pre‐ and post‐actional phase in goal pursuit after failure. Participants received feedback for an alleged intelligence test and subsequently worked on the same test again. As indicators of exercised self‐control, we assessed self‐confidence in the pre‐actional phase and rumination in the post‐actional phase. As hypothesized, tonic HRV was positively associated with pre‐ and post‐actional self‐control, even after controlling for the effect of neuroticism. We discuss the implications of our results for the self‐regulatory strength model. Copyright © 2009 John Wiley & Sons, Ltd.

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