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Coherence between fluctuations in blood flow and oxygen saturation

Research output: Contribution to journalJournal article


Article number1240013
Journal publication date03/2012
JournalFluctuation and Noise Letters
Journal number1
Number of pages12
Original languageEnglish


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.