Dynamical Pattern Representation of Cardiovascular Couplings Evoked by Head-up Tilt Test
Rattachement africain : pl, jp. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Shannon entropy (ShE) is a recognised tool for the quantization of the temporal organization of time series. Transfer entropy (TE) provides insight into the dependence between coupled systems. Here, signals are analysed that were produced by the cardiovascular system when a healthy human underwent a provocation test using the head-up tilt (HUT) protocol. The information provided by ShE and TE is evaluated from two aspects: that of the algorithmic stability and that of the recognised physiology of the cardiovascular response to the HUT test. To address both of these aspects, two types of symbolization of three-element subsequent values of a signal are considered: one, well established in heart rate research, referring to the variability in a signal, and a novel one, revealing primarily the dynamical trends. The interpretation of ShE shows a strong dependence on the method that was used in signal pre-processing. In particular, results obtained from normalized signals turn out to be less conclusive than results obtained from non-normalized signals. Systematic investigations based on surrogate data tests are employed to discriminate between genuine properties-in particular inter-system coupling-and random, incidental fluctuations. These properties appear to determine the occurrence of a high percentage of zero values of TE, which strongly limits the reliability of the couplings measured. Nevertheless, supported by statistical corroboration, we identify distinct timings when: (i) evoking cardiac impact on the vascular system, and (ii) evoking vascular impact on the cardiac system, within both the principal sub-systems of the baroreflex loop.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Dynamical Pattern Representation of Cardiovascular Couplings Evoked by Head-up Tilt Test
- Date Crossref
- 28/03/2018
- Éditeur
- MDPI AG
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
-
University of Gdańsk Department of Hypertension and Diabetology pays non établi dans la noticeUniversité ou école supérieure
-
Gdańsk Medical University pays non établi dans la noticeUniversité ou école supérieure
-
RIKEN Center for Brain Science pays non établi dans la noticeStructure de recherche
-
The University of Tokyo pays non établi dans la noticeUniversité ou école supérieure
-
Faculty of Mathematics Institute of Theoretical Physics and Astrophysics pays non établi dans la noticeUniversité ou école supérieure
-
Graduate School of Education pays non établi dans la noticeUniversité ou école supérieure
-
Brain Science Institute RIKEN pays non établi dans la noticeStructure de recherche
Department of Hypertension and Diabetology — University of Gdańsk, Gdańsk Medical University et RIKEN Center for Brain Science, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.