قارن الطرق

	Heart Rate Variability	قياس ضوئي لحجم الدم (PPG)
المجال	الميكانيكا الحيوية	الميكانيكا الحيوية
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1996	1937
صاحب الطريقة	Task Force of European Society of Cardiology	Hertzman
النوع	Time-series and frequency-domain analysis pipeline	Optical signal acquisition and analysis pipeline
المصدر التأسيسي	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.	Allen, J. (2007). Photoplethysmography and its application in clinical physiology. Physiology & Behavior, 107(4), 540-548.
الأسماء البديلة	HRV, RR interval analysis, Cardiac variability	PPG, Pulse oximetry, Reflectance photometry
ذات صلة	3	3
الملخص	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.	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.