Title :
Short-term complexity of cardiovascular oscillations during orthostatic change in aging
Author :
Catai, Aparecida M. ; Takahashi, Anielle C. M. ; Perseguini, Natalia M. ; Milan, Juliana C. ; Minatel, Vinicius ; Bassani, T. ; Bari, Vlasta ; Marchi, Andrea ; Santos, Patricia R. ; Borghi-Silva, Audrey ; Montano, Nora ; Porta, Alberto
Author_Institution :
Fed. Univ. of Sao Carlos, Sao Carlos, Brazil
Abstract :
Complexity of R-R intervals (RR) and systolic arterial pressure (SAP) variability were computed to detect the aging process influence over cardiovascular control in resting supine (REST) and standing position (STAND). One hundred healthy subjects were divided into five groups (n=20 for each), according to age: 21-30; 31-40; 41-50; 51-60; 61-70. The RR and SAP series were recorded for 15 minutes at REST and STAND. Short sequences of RR and SAP were analyzed by conditional entropy. At REST, RR complexity showed reduction with age in 61-70, and SAP complexity decreased, starting from 31-40. Changes in cardiovascular control complexity, induced by STAND, reveal the difficulty of elderly individuals in dealing with sympathetic stressors.
Keywords :
cardiovascular system; electrocardiography; medical signal processing; oscillations; ECG; R-R interval complexity; RR sequences; SAP sequences; SAP series recording; aging process; cardiovascular control; cardiovascular control complexity; cardiovascular oscillations; conditional entropy; orthostatic change; resting supine position; short-term complexity; standing position; sympathetic stressors; systolic arterial pressure variability; time 15 min; Aging; Complexity theory; Correlation; Entropy; Heart; Indexes; Modulation;
Conference_Titel :
Cardiovascular Oscillations (ESGCO), 2014 8th Conference of the European Study Group on
Conference_Location :
Trento
DOI :
10.1109/ESGCO.2014.6847513
