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.

In this experiment, the heat flux signal was combined with several other parameters, 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 the heat flux signal was combined with several other parameters resulting 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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