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    Rights statement: Downgraded to postprint Electronic version of this article published as Coherence between fluctuations in blood flow and oxygen saturation in Fluctuation and Noise Letters 11, 1, 2012, 1240013 10.1142/S0219477512400135 © [copyright World Scientific Publishing Company] http://www.worldscientific.com/doi/abs/10.1142/S0219477512400135

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    Date added: 15/04/15

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Coherence between fluctuations in blood flow and oxygen saturation

Research output: Contribution to journalJournal article

Published
Article number1240013
<mark>Journal publication date</mark>03/2012
<mark>Journal</mark>Fluctuation and Noise Letters
Issue number1
Volume11
Number of pages12
Pages (from-to)-
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

We have determined the wavelet phase coherence between simultaneously recorded microvascular blood flow and oxygen saturation signals from 88 healthy subjects, thus enabling us to study their common fluctuations. Measurements were taken for 30min from the arm and leg, at two depths. In the skin, blood flow and oxygen saturation were found to be coherent both at the cardiac frequency and below 0.1Hz down to about 0.01Hz. Coherence in the arm extends to lower frequencies than that in the leg. From the deeper recordings, no coherence was found on either limb. The existence of coherence between skin blood flow and oxygen saturation demonstrates causal connections between them within certain frequency ranges. The method has yielded the first detailed insight into the dynamics of blood oxygenation.

Bibliographic note

Electronic version of this article published as Coherence between fluctuations in blood flow and oxygen saturation in Fluctuation and Noise Letters 11, 1, 2012, 1240013 10.1142/S0219477512400135 © [copyright World Scientific Publishing Company] http://www.worldscientific.com/doi/abs/10.1142/S0219477512400135