title: Influence of a skin status on the light interaction with dermis.
abstract: We present experimental evidence that the parameters of green light remitted from a human tissue in-vivo strongly depend on skin contact status. In case when the skin is free of any contact, simultaneous recording of imaging photoplethysmogram (iPPG) and electrocardiogram revealed that contactless iPPG fails in correct estimates of the heart rate in almost half of the cases. Meanwhile, the number of successful correlations between ECG and iPPG is significantly increased when the skin is in contact with a glass plate. These observations are in line with the recently proposed model in which pulsatile arteries deform the connective-tissue components of the dermis thus resulting in temporal modulation of the capillary density interacting with slightly penetrating light.
authors.affiliation: Department of Computer Photonics and Videomatics, ITMO University, St. Petersburg, 197101, Russia.
authors.forename: Alexei A
authors.initials: AA
authors.lastname: Kamshilin
authors.affiliation: Pavlov First St. Petersburg State Medical University, St. Petersburg, 197022, Russia.
authors.forename: Oleg V
authors.initials: OV
authors.lastname: Mamontov
authors.affiliation: Federal State Institution "1477 Navy Clinical Hospital", Vladivostok, 690005, Russia.
authors.forename: Vasily T
authors.initials: VT
authors.lastname: Koval
authors.affiliation: Federal State Institution "1477 Navy Clinical Hospital", Vladivostok, 690005, Russia.
authors.forename: Grigory A
authors.initials: GA
authors.lastname: Zayats
authors.affiliation: Institute for Automation and Control Processes of FEB RAS, 5 Radio St., Vladivostok, 690041, Russia ; Far Eastern Federal University, 8 Sukhanova St., Vladivostok, 690900, Russia.
authors.forename: Roman V
authors.initials: RV
authors.lastname: Romashko
keywords: (170.3660) Light propagation in tissues; (170.3880) Medical and biological imaging; (280.1415) Biological sensing and sensors