2022 Volume 19 Issue 21 Pages 20220371
In this study, a vasomotion quantification method using a photoplethysmography prototype, which performs near-infrared spectroscopy combined with green light, is proposed. This structure suppresses the motion artifact and is held by eyeglasses at the back of the ear; this helps improve the integrity of the measured relative concentration changes of the total hemoglobin and pulse wave amplitude during exercise with and without the presence of wind impacting the face. We established a microcirculatory windkessel model including arteriovenous anastomoses estimated from blood flow changes in the depth direction that were acquired using three wavelengths of light and reproduced the vasomotion on a computer. The values predicted by the model were in good agreement with the measured values. The extracted vasomotion can be used to understand autonomic control by the central nervous system.
