Core Body Temperature Measurements


The core body temperature (CBT) is an important property to know in order to make accurate assessments of the human body’s state of health. The information can be used in a variety of applications:

  • Performance optimization for athletes

  • Monitoring inside incubators for prematurely born children

  • Alerting people working in highly dangerous environments (e.g. firefighters)

  • Sleep (quality) tracking

In these, and other applications, it is crucial to get reliable data of the core body temperature. Most of today’s measurement concepts use only temperature sensors for this task. These methods give a good approximation, but cannot measure the core temperature directly (unless via invasive methods in the human body). The following section outlines a potentially more accurate method for measuring CBT using gSKIN® Heat Flux Sensors and temperature sensors.

Advantages of gSKIN® Heat Flux Sensors:

  • Small heat flux sensor with high sensitivity, easily integrate into application setups

  • Non-invasive measurement technique with the potential to determine core body temperature

  • Easy to mount on the skin, does not disturb the exercise routine or working habits

  • Possibilty to be integrated with an easy read out software which allows for in-depth analysis


Measuring Core Body Temperature

The images on the right side show how a core body measurement is done. By placing a gSKIN® Heat Flux Sensor and a temperature sensor on a spot on the body (e.g. on the chest), the core body temperature can be calculated using this approach:

  1. Install a gSKIN®Heat Flux Sensor and temperature sensor on the chest.

  2. Log the temperature and heat flux measurements (in Watts/m2).

  3. Determine the thermal resistance (in Kelvin/Watt/m2) between the forehead and the core with the calibration measurement (assuming Tcore= 37o C).

  4. Calculate the temperature difference between the chest and core by using
    ΔT = (Heat Flux) x (Thermal Resistance)

  5. Calculate the temperature at the core by using
    TCore= TChest + ΔT

Contact us if you are interested in this application.