title: Simultaneous recording of skin blood pulsations at different vascular depths by multiwavelength photoplethysmography.
abstract: A new technique for parallel recording of reflection photoplethysmography (PPG) signals in a broad spectral band (violet to near-infrared) has been developed, and its potential for assessment of blood microcirculation at various depths from the skin surface is discussed. PPG signals have been simultaneously detected at cw laser wavelength sets comprising 405, 532, 645, 807, and 1064 nm. Various signal baseline responses to breath holding and different shapes of the PPG pulses originated from the same heartbeat but recorded at different wavelengths have been observed, indicating a depth variety of the skin blood pulsation dynamics.
authors.affiliation: Bio-optics and Fiber Optics Laboratory, Institute of Atomic Physics and Spectroscopy, University of Latvia, Latvia. janispi@latnet.lv
authors.forename: Janis
authors.initials: J
authors.lastname: Spigulis
authors.forename: Lasma
authors.initials: L
authors.lastname: Gailite
authors.forename: Alexey
authors.initials: A
authors.lastname: Lihachev
authors.forename: Renars
authors.initials: R
authors.lastname: Erts
mesh_terms: D000465:Algorithms; D001783:Blood Flow Velocity / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D017156:Photoplethysmography / Q000295:instrumentation / Q000379:methods*; D011673:Pulsatile Flow / Q000502:physiology*; D012867:Skin / Q000098:blood supply*; D012879:Skin Physiological Phenomena