手法を比較

	Photoplethysmography	Windkesselモデル
分野	バイオメカニクス	バイオメカニクス
系統	Process / pipeline	Process / pipeline
提唱年	1937	1969
提唱者	Hertzman	Nikolaos Westerhof
種類	Optical signal acquisition and analysis pipeline	Physiological lumped-parameter modeling
原典	Allen, J. (2007). Photoplethysmography and its application in clinical physiology. Physiology & Behavior, 107(4), 540-548.	Westerhof, N., Bosman, F., De Vries, N. C., & Noordergraaf, A. (1969). Analog studies of the human systemic arterial tree. Journal of Biomechanics, 2(2), 121-143.
別名	PPG, Pulse oximetry, Reflectance photometry	Elastic chamber model, Arterial compliance model, Lumped parameter model
関連	3	3
概要	Photoplethysmography (PPG) measures blood volume changes in tissue using light absorption, providing a non-invasive optical window into cardiovascular dynamics. Originally developed by Hertzman in 1937, PPG is now ubiquitous in pulse oximetry, smartwatches, and research applications for monitoring heart rate, blood oxygenation, and vascular function.	The Windkessel model is a lumped-parameter representation of the arterial system that captures the pulsatile dynamics of blood flow and pressure using simple mechanical analogs (resistors and capacitors). Named after the German word for air chamber, it was formalized by Westerhof and colleagues in the late 1960s and remains fundamental to understanding arterial hemodynamics and blood pressure regulation.