TY - JOUR
T1 - Exercise Core Temperature Response with a Simulated Burn Injury
T2 - Effect of Body Size
AU - Cramer, Matthew N.
AU - Moralez, Gilbert
AU - Huang, M. U.
AU - Kouda, K. E.N.
AU - Poh, Paula Y.S.
AU - Crandall, Craig G.
N1 - Funding Information:
The authors are grateful to the participants who volunteered for this study. The authors thank Amy Adams, Sarah Bailey, Daniel Gagnon, Manall Jaffery, Naomi Kennedy, Kelly Lenz, Jan Petric, and Steven Romero for their assistance with data collection, as well as Ollie Jay for his input toward the development of the experimental protocol. This work was supported by awards from the Department of Defense (W81XWH-15-1-0647 to C. G. C.), National Institutes of Health (R01GM068865 to C. G. C.), and a Natural Sciences and Engineering Research Council of Canada Postdoctoral Fellowship (to M. N. C.).
Publisher Copyright:
© Lippincott Williams & Wilkins.
PY - 2020/3/1
Y1 - 2020/3/1
N2 - Although the severity of a burn injury is often associated with the percentage of total body surface area burned (%TBSA), the thermoregulatory consequences of a given %TBSA injury do not account for the interactive effects of body morphology and metabolic heat production (Hprod). Purpose Using a simulated burn injury model to mimic the detrimental effect of a 40% TBSA injury on whole-body evaporative heat dissipation, core temperature response to exercise in physiologically uncompensable conditions between morphologically disparate groups were examined at (i) an absolute Hprod (W), and (ii) a mass-specific Hprod (W·kg-1). Methods Healthy, young, nonburned individuals of small (SM, n = 11) or large (LG, n = 11) body size cycled for 60 min at 500 W or 5.3 W·kg-1 of Hprod in 39°C and 20% relative humidity conditions. A 40% burn injury was simulated by affixing a highly absorbent, vapor-impermeable material across the torso (20% TBSA), arms (10% TBSA), and legs (10% TBSA) to impede evaporative heat loss in those regions. Results Although the elevation in core temperature was greater in SM compared with LG at an Hprod of 500 W (SM, 1.69°C ± 0.26°C; LG, 1.05°C ± 0.26°C; P < 0.01), elevations in core temperature were not different at an Hprod of 5.3 W·kg-1 between groups (SM, 0.99°C ± 0.32°C; LG, 1.05°C ± 0.26°C; P = 0.66). Conclusions These data suggest that among individuals with a 40% TBSA burn injury, a smaller body size leads to exacerbated elevations in core temperature during physical activities eliciting the same absolute Hprod (non-weight-bearing tasks) but not activities eliciting the same mass-specific Hprod (weight-bearing tasks).
AB - Although the severity of a burn injury is often associated with the percentage of total body surface area burned (%TBSA), the thermoregulatory consequences of a given %TBSA injury do not account for the interactive effects of body morphology and metabolic heat production (Hprod). Purpose Using a simulated burn injury model to mimic the detrimental effect of a 40% TBSA injury on whole-body evaporative heat dissipation, core temperature response to exercise in physiologically uncompensable conditions between morphologically disparate groups were examined at (i) an absolute Hprod (W), and (ii) a mass-specific Hprod (W·kg-1). Methods Healthy, young, nonburned individuals of small (SM, n = 11) or large (LG, n = 11) body size cycled for 60 min at 500 W or 5.3 W·kg-1 of Hprod in 39°C and 20% relative humidity conditions. A 40% burn injury was simulated by affixing a highly absorbent, vapor-impermeable material across the torso (20% TBSA), arms (10% TBSA), and legs (10% TBSA) to impede evaporative heat loss in those regions. Results Although the elevation in core temperature was greater in SM compared with LG at an Hprod of 500 W (SM, 1.69°C ± 0.26°C; LG, 1.05°C ± 0.26°C; P < 0.01), elevations in core temperature were not different at an Hprod of 5.3 W·kg-1 between groups (SM, 0.99°C ± 0.32°C; LG, 1.05°C ± 0.26°C; P = 0.66). Conclusions These data suggest that among individuals with a 40% TBSA burn injury, a smaller body size leads to exacerbated elevations in core temperature during physical activities eliciting the same absolute Hprod (non-weight-bearing tasks) but not activities eliciting the same mass-specific Hprod (weight-bearing tasks).
KW - Body Surface Area
KW - Burn Survivor
KW - Effective Surface Area
KW - Heat Production
KW - Work Intensity
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U2 - 10.1249/MSS.0000000000002160
DO - 10.1249/MSS.0000000000002160
M3 - Article
C2 - 31524829
AN - SCOPUS:85079359431
SN - 0195-9131
VL - 52
SP - 705
EP - 711
JO - Medicine and science in sports and exercise
JF - Medicine and science in sports and exercise
IS - 3
ER -