====== Facial blood flow oscillation ======

Experimental data (starting from 1995) have shown that the volume of blood flow in human faces tends to oscillate - rising and falling once every ten seconds or so.

The reasons are unknown. There are currently two theories :

1) That it stems from the blood pressure regulation mechanism

2) That it's caused by 'vasomotion' (contraction and expansion of blood vessels)

See: [[https://www.frontiersin.org/articles/10.3389/fphys.2021.627354/full|Phase Velocity of Facial Blood Volume Oscillation at a Frequency of 0.1 Hz]] //Frontiers in Physiology,// 28 Jan. 2021

//Note :// The highly complex mechanism which controls blood pressure is itself poorly understood. See [[content:medicine:diseases:g-l:hypertension]]