Med Biol Eng Comput - Enhanced phase synchronization of blood flow oscillations between heated and adjacent non-heated sacral skin.

Tópicos

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Resumo

The study of skin microcirculation may be used to assess risk for pressure ulcers. It is observed that local heating causes an increase in blood flow of not only the heated skin, but also in the adjacent non-heated skin. The underlying physiological mechanism of this indirect vasodilation of the non-heated skin remains unclear. We hypothesized that blood flow oscillations (BFO) in the adjacent non-heated skin area synchronize with BFO in the heated skin, thus inducing a vasodilatory response. We investigated BFO in the heated and adjacent non-heated skin (12.1 ? 1.2-cm distance) on the sacrum in 12 healthy participants. The ensemble empirical mode decomposition (EEMD) was used to decompose blood flow signals into a set of intrinsic mode functions (IMFs), and the IMFs with power spectra over the frequency range of 0.0095-0.02, 0.02-0.05, and 0.05-0.15 Hz were chosen as the characteristic components corresponding to metabolic, neurogenic, and myogenic regulations, respectively. Then, the instantaneous phase of the characteristic components was calculated using the Hilbert transform. From the time series of phase difference between a pair of characteristic components, the epochs of phase synchronization were detected. The results showed that myogenic and neurogenic BFO exhibited self-phase synchronization during the slower vasodilation of the heated skin. In the non-heated skin, the degree of synchronization of BFO is associated with the changes in blood flow.

Resumo Limpo

studi skin microcircul may use assess risk pressur ulcer observ local heat caus increas blood flow heat skin also adjac nonheat skin under physiolog mechan indirect vasodil nonheat skin remain unclear hypothes blood flow oscil bfo adjac nonheat skin area synchron bfo heat skin thus induc vasodilatori respons investig bfo heat adjac nonheat skin cm distanc sacrum healthi particip ensembl empir mode decomposit eemd use decompos blood flow signal set intrins mode function imf imf power spectra frequenc rang hz chosen characterist compon correspond metabol neurogen myogen regul respect instantan phase characterist compon calcul use hilbert transform time seri phase differ pair characterist compon epoch phase synchron detect result show myogen neurogen bfo exhibit selfphas synchron slower vasodil heat skin nonheat skin degre synchron bfo associ chang blood flow

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