Validation of Core, Rectal and Skin Temperature Predictions of a Free Web-Based Predictive Heat Strain Software Based on the ISO 7933:2023 Standard in Recreational Athletes

Konstantinos Mantzios, Leonidas G. Ioannou, Eftihia Nikolaki, Paraskevi Gkiata, Georgia Charachousou, Lydia Tsoutsoubi, Petros C. Dinas, Andreas D. Flouris

Journal of Science in Sport and Exercise ›› 2024, Vol. 6 ›› Issue (3) : 303-314.

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Journal of Science in Sport and Exercise ›› 2024, Vol. 6 ›› Issue (3) : 303-314. DOI: 10.1007/s42978-024-00309-5
Original Article

Validation of Core, Rectal and Skin Temperature Predictions of a Free Web-Based Predictive Heat Strain Software Based on the ISO 7933:2023 Standard in Recreational Athletes

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Abstract

We previously developed the FAME Lab PHS software (PHSFL), a free offline software to calculate the predicted heat strain for a group of individuals based on the ISO 7933. The objectives of this study were to: upgrade the PHSFL from an offline (desktop-version) tool to a web-based platform, as well as assess its validity in recreational athletes in different forms of exercise and across various temperature recording methodologies and environmental conditions. The web PHSFL was developed as browser-based software developed using HTML, CSS, and JavaScript, and included several updates from the previous offline version. Its validity was assessed in 83 healthy non-smoking males and females during rest, exercise, and post-exercise recovery in 165 trials (cycling: 97; running: 68). Trials were performed in an environmental chamber under varying environmental conditions: 19.1 to 40.6 °C air temperature, 30.0% to 60.0% relative humidity, 0.1 to 0.5 m/s wind speed, and 0 or 800 W/m2 solar radiation. Comparison of actual vs. predicted core body temperature showed 0.85 Willmott’s Index of Agreement, 0.76 (P < 0.001) correlation coefficient, and 95% limits of agreement of 0.16 ± 0.83 °C (mean difference ± 95% limits). Results for rectal temperature showed 0.79 Willmott’s Index of Agreement, 0.68 (P < 0.001) correlation coefficient, and 95% limits of agreement of 0.18 ± 0.76 °C. Results for skin temperature showed 0.77 Willmott’s Index of Agreement, 0.75 (P < 0.001) correlation coefficient, and 95% limits of agreement of − 0.24 ± 2.28 °C. We conclude that the web PHSFL provides acceptably accurate predictions of core body temperature and skin temperature to be used as indicators of physiological heat strain.

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Konstantinos Mantzios, Leonidas G. Ioannou, Eftihia Nikolaki, Paraskevi Gkiata, Georgia Charachousou, Lydia Tsoutsoubi, Petros C. Dinas, Andreas D. Flouris. Validation of Core, Rectal and Skin Temperature Predictions of a Free Web-Based Predictive Heat Strain Software Based on the ISO 7933:2023 Standard in Recreational Athletes. Journal of Science in Sport and Exercise, 2024, 6(3): 303‒314 https://doi.org/10.1007/s42978-024-00309-5
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