विधियों की तुलना करें

	फोटोप्लेथिस्मोग्राफी	हृदय गति परिवर्तनशीलता	विंडकेसल मॉडल
क्षेत्र	जैव यांत्रिकी	जैव यांत्रिकी	जैव यांत्रिकी
परिवार	Process / pipeline	Process / pipeline	Process / pipeline
उद्भव वर्ष	1937	1996	1969
प्रवर्तक	Hertzman	Task Force of European Society of Cardiology	Nikolaos Westerhof
प्रकार	Optical signal acquisition and analysis pipeline	Time-series and frequency-domain analysis pipeline	Physiological lumped-parameter modeling
मौलिक स्रोत	Allen, J. (2007). Photoplethysmography and its application in clinical physiology. Physiology & Behavior, 107(4), 540-548.	Task Force of the European Society of Cardiology and the North American Society of Pacing and Electrophysiology. (1996). Heart rate variability: standards of measurement, physiological interpretation, and clinical use. Circulation, 93(5), 1043-1065.	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.
उपनाम	PPG, Pulse oximetry, Reflectance photometry	HRV, RR interval analysis, Cardiac variability	Elastic chamber model, Arterial compliance model, Lumped parameter model
संबंधित	3	3	3
सारांश	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.	Heart rate variability (HRV) analysis quantifies the variation in time intervals between consecutive heartbeats as a window into autonomic nervous system function and cardiovascular health. Formalized by the European Society of Cardiology Task Force in 1996, HRV metrics are now standard in cardiology, physiology, and sports science for assessing stress, recovery, and disease risk.	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.