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Heart rate (HR) is a fundamental physiological parameter that reflects cardiovascular health and fitness levels. Accurate HR monitoring is essential for diagnosing medical conditions, guiding physical training, and monitoring stress and recovery. With the increased development of wearable devices, the new direction of research appeared in the field of personalized comfort based on the physiological response and closing the HVAC control loop based on the occupant-s involuntary reaction. This article reviews current...