Phase Velocity of Facial Blood Volume Oscillation at a Frequency of 0.1 Hz.

ABSTRACT: Facial blood flow, which typically exhibits distinctive oscillation at a frequency of around 0.1 Hz, has been extensively studied. Although this oscillation may include important information about blood flow regulation, its origin remains unknown. The spatial phase distribution of the oscillation is thus desirable. Therefore, we visualized facial blood volume oscillation at a frequency of around 0.1 Hz using a digital camera imaging method with an improved approximation equation, which enabled precise analysis over a large area. We observed a slow spatial movement of the 0.1-Hz oscillation. The oscillation phase was not synchronized, but instead moved slowly. The phase velocity varies with person, measurement location, and time. An average phase velocity of 3.8 mm/s was obtained for severa

SUBMITTER: Yoshida K 

PROVIDER: S-EPMC7876320 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature