Evaluation of In-Ear and Fingertip-Based Photoplethysmography Sensors for Measuring Cardiac Vagal Tone Relevant Heart Rate Variability Parameters by Ankit Parikh, Gwyn Lewis, Hamid GholamHosseini, Usman Rashid, David Rice, Faisal Almesfer

Subjects: “…root mean square of successive R-R interval differences (RMSSDs)…”
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