Approximate entropies of resting state continuous neurocardiovascular physiological signals are associated with physical frailty in older adults
Citation:
Silvin Knight, Louise Newman, John O'Connor, Rose Anne Kenny, Roman Romero-Ortuno, Approximate entropies of resting state continuous neurocardiovascular physiological signals are associated with physical frailty in older adults, Entropy 2021: The Scientific Tool of the 21st Century, Entropy 2021: The Scientific Tool of the 21st Century, Virtual, 5-7 May 2021, 2021Download Item:
Abstract:
Frailty in older adults is characterised by dysregulation in multiple physiological systems. The frailty phenotype is defined on the basis of exhaustion, unexplained weight loss, weakness, slowness and low physical activity (one or two: pre-frail; 3 or more: frail). Our aim was to explore if increasing frailty is associated with the complexity of resting state physiological signals in a large cohort of community-dwelling older adults, enrolled as part of The Irish Longitudinal Study on Ageing (TILDA).
Systolic/diastolic blood pressure (SBP/DBP), mean arterial pressure (MAP), and heart rate (HR) were measured in 3,154 participants (66.2% non-frail; 31.3% pre-frail; 2.5% frail) using a Finometer® device at 200Hz; and frontal lobe oxygenation (tissue saturation index (TSI)) in 2,749 individuals (66.3% non-frail; 31.3% pre-frail; 2.4% frail) at 50Hz using an Artinis Portalite® near infrared spectroscopy system. Data were acquired continuously during five minutes of supine rest and the last minute (downsampled to 5Hz) was utilised in these analyses. The complexity of signals was quantified using approximate entropy (ApEn) with m=2 and an optimal r derived via multiple iterations, implemented in Matlab (R2019a). Statistical analysis was performed using multivariate linear regression models in STATA (v14.1), controlling for age, sex, education, antihypertensive medication, diabetes, number of cardiovascular conditions, smoking, alcohol, and depression.
Mean age for both groups was 64.3±8.1 years and 53% were female. The pre-frail group was associated with significantly increased ApEn for all measures investigated (sBP: β=0.014, P≤0.001; dBP: β=0.009, P=0.002; MAP: β=0.012, P≤0.001; HR: β=0.011, P=0.003; TSI: β=0.009, P=0.002). Likewise, the frail group was associated with further increased ApEn for all measures investigated (sBP: β=0.031, P=0.002; dBP: β=0.028, P=0.003; MAP: β=0.038, P≤0.001; HR: β=0.034, P=0.001; TSI: β=0.018, P=0.029).
Approximate entropy seems to be a sensitive method to capture increasing signal complexity in multiple physiological systems associated with the frailty phenotype during resting state.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
18/FRL/6188
Author's Homepage:
http://people.tcd.ie/romeroorhttp://people.tcd.ie/siknight
Description:
PUBLISHEDVirtual
Author: Romero-Ortuno, Roman; Knight, Silvin
Other Titles:
Entropy 2021: The Scientific Tool of the 21st CenturyEntropy 2021: The Scientific Tool of the 21st Century
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Full text availableKeywords:
physical frailty, resting state, continuous physiological monitoring, hemodynamics, near infrared spectroscopy, cerebral oxygenation, approximate entropySubject (TCD):
Ageing , NeuroscienceDOI:
https://sciforum.net/paper/view/9841Metadata
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