Document Detail


Spectral evaluation of aging effects on blood pressure and heart rate variations in healthy subjects.
MedLine Citation:
PMID:  16772217     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The background to heart rate variability (HRV) and blood pressure variability (BPV), and their determinants and physiological correlates, remain obscure. The impact of age must be taken into account if HRV and BPV are used for predictive purposes in clinical settings. Healthy subjects show wide inter-individual variation in their heart rate behaviour and the factors affecting heart rate dynamics are not well known. This paper has undertaken to evaluate heart rate variability (HRV) and baroreflex sensitivity (BRS) in a random sample of subjects without evidence of heart disease, and to estimate the relation of HRV and BPV behaviour to age. The aim of this study was to analyse the effects of ageing on HRV and BPV for simultaneous recordings of electrocardiograph (ECG) and blood pressure (BP) signals at rest in healthy subjects. We studied eight young (21-34 years old) and eight elderly (68-85 years old) rigorously screened subjects from the Fantasia Database to make the reproducibility and comparability of the results more extensive. Time- and frequency-domain analysis of HRV and BPV was performed on 5-minute ectopic-free recordings. BRS on the heart was estimated by frequency-domain analysis of spontaneous variability of systolic blood pressure (SBP) and RR interval. It has been observed that compared to young the elderly subjects have (i) diminished HRV; (ii) a shift in the power spectral density and median frequency to low frequency side for HRV and to higher frequency side for BPV; and (iii) increased low-frequency alpha index and decreased high-frequency alpha index of BRS with overall alpha index augmented. The results convey that normal ageing in the absence of disease is associated with lesser parasympathetic regulation of heart rate. Thus it is concluded that the age is an important factor to be considered for prognosis and diagnosis by HRV and BPV. For reliable clinical applications, more research needs to be done on a broad spectrum of subjects. In addition, these observations will prove to be useful for dynamic modelling of cardiovascular regulation for testing the authentication of new techniques for analysis purposes.
Authors:
D Singh; K Vinod; S C Saxena; K K Deepak
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of medical engineering & technology     Volume:  30     ISSN:  0309-1902     ISO Abbreviation:  J Med Eng Technol     Publication Date:    2006 May-Jun
Date Detail:
Created Date:  2006-06-14     Completed Date:  2006-12-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7702125     Medline TA:  J Med Eng Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  145-50     Citation Subset:  IM    
Affiliation:
Department of Instrumentation & Control Engineering, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar, 144011, India.
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MeSH Terms
Descriptor/Qualifier:
Adult
Age Factors
Aged
Aged, 80 and over
Aging / physiology*
Baroreflex / physiology
Blood Pressure / physiology*
Female
Heart Rate / physiology*
Humans
Male

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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