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Technical Brief

Comparison Between Experimental and Heart Rate-Derived Core Body Temperatures Using a Three-Dimensional Whole Body Model

[+] Author and Article Information
Rupak K. Banerjee

Department of Mechanical and Materials Engineering,
University of Cincinnati,
Cincinnati, OH 45221
e-mail: Rupak.Banerjee@uc.edu

Robins T. Kalathil, Anup K. Paul

Department of Mechanical and Materials Engineering,
University of Cincinnati,
Cincinnati, OH 45221

Swarup A. Zachariah

Department of Mechanical and Materials Engineering,
University of Cincinnati, Cincinnati, OH 45221

Amit Bhattacharya

Department of Environmental Health,
University of Cincinnati,
Cincinnati, OH 45267

Gavin P. Horn

University of Illinois Fire Service Institute,
11 Gerty Drive,
Champaign, IL 61820

Denise L. Smith

University of Illinois Fire Service Institute,
11 Gerty Drive, Champaign, IL 61820;
Health and Exercise Sciences Department,
Skidmore College,
815 North Broadway,
Saratoga Springs, NY 12866

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received January 20, 2018; final manuscript received September 17, 2018; published online November 19, 2018. Assoc. Editor: Pedro Mago.

J. Thermal Sci. Eng. Appl 11(2), 024502 (Nov 19, 2018) (6 pages) Paper No: TSEA-18-1036; doi: 10.1115/1.4041594 History: Received January 20, 2018; Revised September 17, 2018

Determination of core body temperature (Tc), a measure of metabolic rate, in firefighters is needed to avoid heat-stress related injury in real time. The measurement of Tc is neither routine nor trivial. This research is significant as thermal model to determine Tc is still fraught with uncertainties and reliable experimental data for validation are rare. The objective of this study is to develop a human thermoregulatory model that uses the heart rate measurements to obtain Tc for firefighters using a 3D whole body model. The hypothesis is that the heart rate-derived computed Tc correlates with the measured Tc during firefighting activities. The transient thermal response of the human body was calculated by simultaneously solving the Pennes' bioheat and energy balance equations. The difference between experimental and numerical values of Tc was less than 2.6%. More importantly, a ± 10% alteration in heart rate was observed to have appreciable influence on Tc, resulting in a ± 1.2 °C change. A 10% increase in the heart rate causes a significant relative % increase (52%) in Tc, considering its allowable/safe limit of 39.5 °C. Routine acquisition of the heart rate data during firefighting scenario can be used to derive Tc of firefighters in real time using the proposed 3D whole body model.

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Copyright © 2019 by ASME
Topics: Temperature , Heat , Stress
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References

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Figures

Grahic Jump Location
Fig. 1

Schematic of the whole body model with a temperature contour plot at steady-state

Grahic Jump Location
Fig. 2

(a) Heart rate time series for firefighter 1 during the entire firefighting training drill, (b) change in Tc_N, Tc_E, and Tc based on perturbed heart rate (Tc_N_upper and Tc_N_lower) for firefighter 1 during the firefighting training drill, and (c) changes in cardiac output and stroke volume over time for firefighter 1

Grahic Jump Location
Fig. 3

Heart rate of (a) firefighter 2 and (b) firefighter 3. Change in Tc_N, Tc_E, and Tc based on perturbed heart rate (Tc_N_upper and Tc_N_lower) for (c) firefighter 2 and (d) firefighter 3.

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