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
Accepted author manuscript, 283 KB, PDF document
Research output: Contribution to Journal/Magazine › Journal article › peer-review
| Article number | 1240013 |
|---|---|
| <mark>Journal publication date</mark> | 03/2012 |
| <mark>Journal</mark> | Fluctuation and Noise Letters |
| Issue number | 1 |
| Volume | 11 |
| Number of pages | 12 |
| Pages (from-to) | - |
| Publication Status | Published |
| <mark>Original language</mark> | English |
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.