[Age-dependent characteristics of the skin peripheral blood flow oscillations by nonlinear dynamics methods in humans].
Study of peripheral microhaemodynamics was carried out with laser Doppler flowmetry in healthy volunteers of different age groups. The ageing changes in the state of the skin peripheral blood flow, in the functioning of separate links and regulatory systems ofmicrovascular bed have been estimated in terms of relative entropy and fractal dimension values. The revealed significant age-dependent decrease of relative entropy values in the respiratory rhythm ranges, the neurogenic and myogenic activities yielded some evidence concerning the reduction of the microcirculation system chaotic changes within these frequency ranges during the ageing. The significant increase of fractal dimension values in the ranges of cardio-rhythm and the endothelial activity in the oldest group with the mean age of 77 years indicated that the structural complexity of the oscillations in these frequency ranges increased during ageing.
A V
AV
Tankanag
I V
IV
Tikhonova
N K
NK
Chemeris
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D017709:Fractals; D006801:Humans; D017078:Laser-Doppler Flowmetry; D008833:Microcirculation; D008875:Middle Aged; D017711:Nonlinear Dynamics; D012039:Regional Blood Flow; D012867:Skin / Q000098:blood supply*; D012881:Skin Temperature