2.4.2. Physiological measurements
The average pulse rate, systolic blood pressure, and diastolic blood pressure were measured using a wireless portable blood pressure monitor (OMRON Smart Elite+). The average peripheral oxygen saturation (SpO2) was measured with an oximeter (O2Ring, US). In addition to the physiological indicators at a single time point, we collected data on HRV, which is a measure of the cardiac control exerted by the central autonomic nervous system (ANS) and a biomarker for stress for its association with emotional regulation ability (