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Heat flux systems for body core temperature assessment during exercise
Hein A M Daanen1, Veerle Kohlen1, Lennart P J Teunissen2
1Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam, the Netherlands.
Journal of Thermal Biology
|February 16, 2023
Summary
Heat flux systems show varied accuracy in measuring core body temperature during exercise. Careful interpretation is needed as Medisim and 3M systems present significant deviations from rectal temperature readings.
Area of Science:
- Physiology
- Sports Science
- Biomedical Engineering
Background:
- Heat flux systems are increasingly utilized for assessing core body temperature.
- Limited validation studies exist comparing multiple commercial heat flux systems.
Purpose of the Study:
- To compare the accuracy of three commercial heat flux systems (3M, Medisim, Core) against rectal temperature (Tre) during exercise.
- To evaluate the performance and potential discrepancies of these systems in dynamic thermal conditions.
Main Methods:
- Nine participants (5 females, 4 males) underwent exercise until exhaustion in a controlled climate chamber (18°C, 50% RH).
- Rectal temperature (Tre) was measured and compared with readings from 3M, Medisim, and Core heat flux systems.
- Temperature data were analyzed at rest, during exercise, and at exhaustion.
Main Results:
- Medisim system readings were lower than Tre at rest, while 3M and Core showed no significant difference.
- Post-exercise, Medisim readings were significantly higher than Tre.
- Temperature profiles varied: Medisim showed a faster increase, Core tended to overestimate, and 3M exhibited large errors, potentially due to sweat ingress.
Conclusions:
- Heat flux systems demonstrate variable accuracy and differing temperature profiles compared to rectal temperature during exercise.
- The interpretation of heat flux sensor values as core body temperature requires caution.
- Further research is necessary to understand the physiological significance of heat flux sensor measurements.
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