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First, measurements were excluded if they met one of the following criteria [12]: (1) if HR was measured outside the technical ranges as stated by the manufacturer (30 to 240 bpm), or (2) if temperature decreased by 0.5 °C or more and HR was above its median plus 3 times its median absolute deviation [14,15] during 5 minutes at the end of a measurement period. The latter indicates that the sensor was removed and not directly put on the charger.
JMIR Perioper Med 2022;5(1):e40815
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(A) Schematic overview of wearable sensors and reference devices and their placement on the participant’s body (B) during application and (C) during the experiment. Details: (1) Everion placed on the (a) right arm and (b) left arm; (2) Vital Patch; (3) Fitbit Charge 3; (4) Oxycon Mobile (a) 4 electrocardiography electrodes, (b) oxygen saturation probe, and (c) face mask; (5) i Button placed on the (a) right arm, (b) left arm, and (c) chest.
JMIR Form Res 2022;6(1):e30863
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