Physiological monitoring devices with adjustable signal analysis and interrogation power and monitoring methods using same

A monitoring device configured to be attached to a subject, the monitoring device comprising:

• a sensor configured to detect and/or measure physiological information from the subject;
• and
• a processor coupled to the sensor, wherein the processor is configured to receive and analyze signals produced by the sensor, and wherein the processor changes an algorithm used to extract a physiological signal from noise by implementing frequency-domain digital signal processing in response to detecting high subject activity, and wherein the processor implements time-domain digital signal processing in response to detecting low subject activity.

A monitoring device configured to be attached to a subject, the monitoring device comprising:

• a photoplethysmography (PPG) sensor configured to detect and/or measure physiological information from the subject;
• and
• a processor coupled to the PPG sensor, wherein the processor is configured to receive and analyze signals produced by the PPG sensor, wherein the processor changes signal analysis frequency and/or changes sensor interrogation power sequentially at predetermined times, wherein each predetermined time is associated with measuring at least one different one of a plurality of biometric parameters.