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Citation
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Mitchell JB, Goldston KR, Adams AN, Crisp KM, Franklin BB, Kreutzer A, Montalvo DX, Turner MG, Phillips MD. J. Occup. Env. Hyg. 2015; 12(12): 866-874. |
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Abstract
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INTRODUCTION: Non-invasive temperature monitoring with a sensor inside protective headgear may be effective in detecting temperatures that are associated with heat illness.
PURPOSE: To establish the relationship between in-hardhat temperatures (Tih) and core temperature (Tc) as measured by rectal (Tre) and esophageal (Tes) probes.
METHODS: Thirty males (age 24.57±4.32 yrs.) completed two trials: continuous submaximal exercise (CSE) and a series of high intensity 30-sec sprints (HIE) with a one-minute rest between each. Exercise in both conditions was in a 36° C environment (40% RH) while wearing a standard hardhat with sensors mounted on the forehead that were monitored remotely. Exercise continued until voluntary termination or until Tc reached 39.5°C. Temperatures, heart rate, cardiorespiratory, and perceptual responses were monitored throughout. A physiological strain index (PSI) was calculated from Tc and HR.
RESULTS: The final temperatures in the CSE condition were 38.77 ± 0.41, 38.90 ± 0.49 and 39.29 ± 0.58 °C and in the HIE condition, final temperatures were 38.76 ±0.37, 38.91±0.47 and 39.19±0.57 f (o)C for Tih, Tre and Tes, respectively. The PSI in CSE was 9.62±062, 9.18±1.11 and 10.04±1.05, and in the HIE condition 9.67±068, 9.29±0.99 and 9.86±1.02 based on Tih, Tre and Tes, respectively.
CONCLUSION: The general agreement between the Tih and other temperature measures along with the consistency as indicated by a low coefficient of variation (approx. 1%) in the recordings of the Tih sensors at the point of termination suggest that this device, or similar devices, may have application as a warning system for impending heat-related problems.
Language: en |