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Age-associated alteration of sympatho-vagal balance in a female population assessed through the tone–entropy analysis

Content Provider	Springer Nature Link
Author	Ama, Masari Oida, Eiichi Moritani, Toshio
Copyright Year	2005
Abstract	Through our recent studies on heart rate variability (Oida et al. J Appl Physiol 82:1794–1801, 1997; J Gerontol 54A:M219–M224, 1999a; Acta Physiol Scand 165:129–134, 1999b; Acta Physiol Scand 165:421–422, 1999c), we discover that autonomic functions could be assessed quantitatively in time domain by the tone–entropy (T–E) methodology, where the tone represents sympatho-vagal balance, and the entropy, autonomic regulatory activity. The purpose of this study was then to elucidate an age-associated alteration of sympatho-vagal balance in a female population through this T–E method. ECG R–R time intervals at rest were acquired on 10 min for 73 female subjects. Ageing influence was examined by comparisons between two groups: middle-aged group (40–50), (51.5±0.7 year, n=28) and old-aged (60–70), (69.5±0.8 year, n=45)]. Evaluated tone: [−0.058±0.011 (40–50), and 0.027±0.003 (60–70) (P<0.01)], and entropy: [3.46±0.11 (40–50), and 3.06±0.08 bit (60–70) (P<0.01)]. The result showed that the tone was high and the entropy was low in the old-aged compared with the middle-aged group. When the result was plotted in two-dimensional T–E space, it revealed a curvi–linear relation between the tone and the entropy, consistent with our previous studies on pharmacological blockades, on heart recovery after dynamic exercise and on a male ageing. In conclusion, the result suggested that the sympatho-vagal balance altered or the vagal predominance was impaired with age significantly in this female population. Interestingly, comparing with corresponding male, the female had better autonomic functions.
Starting Page	602
Ending Page	610
Page Count	9
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	94
Issue Number	5
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-06-08
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Autonomic nervous system Heart rate variability Spectral analysis
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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