Heart rate and ventricular repolarization variabilities interactions modification by microgravity simulation during head-down bed rest test

• Type: Article in International Conference Proceedings Book
• Date: 2013

Authors

Bolea, J (Author) Other; Laguna, P (Author) Other; Caiani, EG (Author) Other; Almeida, R (Author) FCUP

Conference proceedings International

Title: 2013 IEEE 26TH INTERNATIONAL SYMPOSIUM ON COMPUTER-BASED MEDICAL SYSTEMS (CBMS)

Pages: 552-553

26th IEEE International Symposium on Computer-Based Medical Systems (CBMS)

Porto, PORTUGAL, JUN 20-22, 2013

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-008-HZG

DOI: 10.1109/CBMS.2013.6627873

Abstract (EN): Features extracted from heart rate variability (HRV) have allowed to classify several cardiac disorders. In this work, the linear relationship between HRV and ventricular repolarization variability is studied as a possible feature for stratifying risk of cardiac arrhythmias under weightlessness conditions. Three VR beat-to-beat indexes extracted from ECG signals as QT, QT(p) (QRS onset to T wave peak) and T-pe (peak to end of T wave) were measured. ARARX modeling was used to estimate the VR variability fraction driven by HRV. Head down bed rest as microgravity Earth-based test increased the linear dependency of VR variability driven by HRV. Furthermore, in a pairwise comparison between PRE and POST conditions showed significant differences (p-values < 0.05) for T-pe variability contents. These results evidence a reduced recovery capacity for the T-pe repolarization variability to restore its linear dependency values to HR in the first moments at the end of BR.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 2