Abstract
Objective: To examine whether non-heat acclimatized (NHA) emergency responders endure greater physiological and perceptual strain than heat acclimatized (HA) counterparts in tropical field settings.
Methods: Eight HA and eight NHA men urban search and rescue personnel had physiological and perceptual responses compared during the initial 4 hours shift of a simulated disaster in tropical conditions (ambient temperature 34.0 8C, 48% relative humidity, wet bulb globe temperature [WBGT] 31.4 8C).
Results: From the 90th minute through to end of shift, HA (38.5 8C) sustained a significantly higher gastrointestinal temperature than NHA (38.1 8C) (mean difference 0.4±0.2 8C, 95%confidence interval [CI] 0.2 to 0.7 8C, P=0.005) despite comparable heart rate (P=0.30), respiratory rate (P=0.88), and axilla skin temperature (P=0.47). Overall, perception of body temperature was similar between cohorts (P=0.87).
Conclusions: The apparent tolerance of greater physiological strain by HA responders occurred in the absence of perceptual differences.
| Original language | English |
|---|---|
| Pages (from-to) | 1250-1256 |
| Number of pages | 7 |
| Journal | Journal of Occupational and Environmental Medicine |
| Volume | 58 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2016 |
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Influence of Chronic Heat Acclimatization on Occupational Thermal Strain in Tropical Field Conditions. / Brearley, Matt B.; Norton, Ian; Rush, Daryl; Hutton, Michael; Smith, Steve; Ward, Linda; Fuentes, Hector.
In: Journal of Occupational and Environmental Medicine, Vol. 58, No. 12, 2016, p. 1250-1256.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Influence of Chronic Heat Acclimatization on Occupational Thermal Strain in Tropical Field Conditions
AU - Brearley, Matt B.
AU - Norton, Ian
AU - Rush, Daryl
AU - Hutton, Michael
AU - Smith, Steve
AU - Ward, Linda
AU - Fuentes, Hector
PY - 2016
Y1 - 2016
N2 - Objective: To examine whether non-heat acclimatized (NHA) emergency responders endure greater physiological and perceptual strain than heat acclimatized (HA) counterparts in tropical field settings. Methods: Eight HA and eight NHA men urban search and rescue personnel had physiological and perceptual responses compared during the initial 4 hours shift of a simulated disaster in tropical conditions (ambient temperature 34.0 8C, 48% relative humidity, wet bulb globe temperature [WBGT] 31.4 8C). Results: From the 90th minute through to end of shift, HA (38.5 8C) sustained a significantly higher gastrointestinal temperature than NHA (38.1 8C) (mean difference 0.4±0.2 8C, 95%confidence interval [CI] 0.2 to 0.7 8C, P=0.005) despite comparable heart rate (P=0.30), respiratory rate (P=0.88), and axilla skin temperature (P=0.47). Overall, perception of body temperature was similar between cohorts (P=0.87). Conclusions: The apparent tolerance of greater physiological strain by HA responders occurred in the absence of perceptual differences.
AB - Objective: To examine whether non-heat acclimatized (NHA) emergency responders endure greater physiological and perceptual strain than heat acclimatized (HA) counterparts in tropical field settings. Methods: Eight HA and eight NHA men urban search and rescue personnel had physiological and perceptual responses compared during the initial 4 hours shift of a simulated disaster in tropical conditions (ambient temperature 34.0 8C, 48% relative humidity, wet bulb globe temperature [WBGT] 31.4 8C). Results: From the 90th minute through to end of shift, HA (38.5 8C) sustained a significantly higher gastrointestinal temperature than NHA (38.1 8C) (mean difference 0.4±0.2 8C, 95%confidence interval [CI] 0.2 to 0.7 8C, P=0.005) despite comparable heart rate (P=0.30), respiratory rate (P=0.88), and axilla skin temperature (P=0.47). Overall, perception of body temperature was similar between cohorts (P=0.87). Conclusions: The apparent tolerance of greater physiological strain by HA responders occurred in the absence of perceptual differences.
UR - http://www.scopus.com/inward/record.url?scp=85007307888&partnerID=8YFLogxK
U2 - 10.1097/JOM.0000000000000902
DO - 10.1097/JOM.0000000000000902
M3 - Article
VL - 58
SP - 1250
EP - 1256
JO - Journal of Occupational and Environmental Medicine
JF - Journal of Occupational and Environmental Medicine
SN - 1076-2752
IS - 12
ER -