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Infrared cameras overestimate skin temperature during rewarming from cold exposure

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journal contribution
posted on 09.03.2022, 09:53 by Matthew MaleyMatthew Maley, Andrew P. Hunt, Aaron J. E. Bach, Clare M. Eglin, Joseph T. Costello
Objective: The primary aim of this study was to assess the accuracy of an infrared camera and that of a skin thermistor, both commercially available. The study aimed to assess the agreement over a wide range of skin temperatures following cold exposure. Methods: Fifty-two males placed their right hand in a thin plastic bag and immersed it in 8 °C water for 30 min whilst seated in an air temperature of 30 °C. Following hand immersion, participants removed the bag and rested their hand at heart level for 10 min. Index finger skin temperature (Tsk) was measured with a thermistor, affixed to the finger pad, and an infrared camera measured 1 cm distally to the thermistor. Agreement between the infrared camera and thermistor was assessed by mean difference (infrared camera minus thermistor) and 95% limits of agreement analysis, accounting for the repeated measures over time. The clinically significant threshold for Tsk differences was set at ±0.5 °C and limits of agreement ±1 °C. Results: As an average across all time points, the infrared camera recorded Tsk 1.80 (SD 1.16) °C warmer than the thermistor, with 95% limits of agreement ranging from −0.46 °C to 4.07 °C. Conclusion: Collectively, the results show the infrared camera overestimated Tsk at every time point following local cooling. Further, measurement of finger Tsk from the infrared camera consistently fell outside the acceptable level of agreement (i.e. mean difference exceeding ±0.5 °C). Considering these results, infrared cameras may overestimate peripheral Tsk following cold exposure and clinicians and practitioners should, therefore, adjust their risk/withdrawal criteria accordingly.

History

School

  • Design and Creative Arts

Department

  • Design

Published in

Journal of Thermal Biology

Volume

91

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Journal of Thermal Biology and the definitive published version is available at https://doi.org/10.1016/j.jtherbio.2020.102614

Acceptance date

30/04/2020

Publication date

2020-05-03

Copyright date

2020

ISSN

0306-4565

eISSN

1879-0992

Language

en

Depositor

Dr Matthew Maley. Deposit date: 8 March 2022

Article number

102614