Abstract
Core Body Temperature (CBT) is one of the most fundamental indicators of human health. Yet, methods to measure CBT remain invasive and often limited to clinical environments. Here, we present JIRS30 heat flux sensor from Jondetech Sensors AB and show how it can realize continuous core body temperature monitoring in a wrist device coupled to an algorithm. By using this system, metrics (amplitude, phase shift) of the circadian rhythm can also be captured. The study included six participants with a combined monitoring time of 282 subject days. Over the human temperature span of 35.5-37.6 °C, the system gives an average bias of less than 0.2 °C and a correlation factor of 0.72 when compared to thermometer pills. The system had a performance which makes it highly relevant for use in continuous core body temperature monitoring on human wrists.
