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Case Study on Skin Calorimetry: Modeling Localized Muscle Heat Transfer During Exercise
Pedro Jesús Rodríguez de Rivera1, Miriam Rodríguez de Rivera2, Fabiola Socorro1
1Department of Physics, University of Las Palmas de Gran Canaria, 35001 Las Palmas de Gran Canaria, Spain.
Biosensors
|September 26, 2025
Summary
Researchers developed a novel analytical model to accurately measure heat loss from the thigh during exercise using skin calorimetry. This model predicts thermal changes and may aid sports and clinical applications.
Area of Science:
- Physiology
- Biophysics
- Mathematical Modeling
Background:
- Direct heat loss measurement in moving limbs is challenging due to convection and radiation.
- Skin calorimetry offers a more accurate method by minimizing these environmental effects.
Purpose of the Study:
- To develop an analytical model for describing the thermal evolution of the rectus femoris muscle during exercise and recovery.
- To accurately measure heat flux in the thigh using skin calorimetry.
Main Methods:
- Utilized a skin calorimeter to measure heat flux in the rectus femoris during 30 minutes of exercise (80 W).
- Developed a novel analytical model based on a sum of two exponentials, including a linear-exponential term, to describe thermal transients.
- Measured skin thermal resistance before and after exercise to estimate subcutaneous temperature changes.
Main Results:
- The analytical model effectively described the thermal evolution of the thigh muscle.
- Identified mean time constants of 5 minutes during exercise and 10 minutes during recovery.
- Quantified mean exercise amplitude (A1) of 1.1 mW/W and post-exercise amplitude of -0.8 mW/W.
- Observed that subcutaneous internal temperature follows the same exponential function as heat flux.
Conclusions:
- The developed mathematical model, defining a Transfer Function (TF), can predict thigh heat flux response to exercise protocols.
- This approach offers potential applications in sports science and clinical settings for thermal monitoring.
- Skin calorimetry combined with the novel analytical model provides accurate insights into limb thermoregulation during physical activity.
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