Non-Invasive Core Body Temperature Measurements During Sleep and Daily Life

This case study presents core body temperature measurements conducted with the gSKIN® BodyTemp KIT. The measurements were taken on the forehead, on the chest, and on the upper arm during sleep, daily life, and physical activities.

A PPG signal, two heat flux signals, a skin temperature signal and an accelerometer signal were combined in this experiment, resulting in an accuracy of <0.15° C measured on the wrist


The study consists of 20h measurements of 6 healthy candidates between 25 and 70 years old in the sleep-wake laboratory of a university hospital. For the thermal resistance compensating algorithm a PPG signal, two heat flux signals, a skin temperature signal and an accelerometer signal were combined resulting in an accuracy of <0.15° C measured on the wrist.

Circadian Cycle Visible in Core Body Temperature Measurements

The measurements nicely resolve the temperature cycle between the highest value during daytime (~37.5 °C) and lowest value during nighttime (~36.5 °C). These peaks are highly related to the circadian cycle, an important signature for early diagnostics, ovulation tracking, burn-out syndrome, and sleep quality.

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