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Title: Influence of Chronic Heat Acclimatization on Occupational Thermal Strain in Tropical Field Conditions.
Authors: Brearley, Matt B
Norton, Ian
Rush, Daryl
Hutton, Michael
Smith, Steve
Ward, Linda
Fuentes, Hector
Citation: Journal of occupational and environmental medicine 2016-12; 58(12): 1250-1256
Abstract: To examine whether non-heat acclimatized (NHA) emergency responders endure greater physiological and perceptual strain than heat acclimatized (HA) counterparts in tropical field settings. 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 °C, 48% relative humidity, wet bulb globe temperature [WBGT] 31.4 °C). From the 90th minute through to end of shift, HA (38.5 °C) sustained a significantly higher gastrointestinal temperature than NHA (38.1 °C) (mean difference 0.4 ± 0.2 °C, 95% confidence interval [CI] 0.2 to 0.7 °C, 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). The apparent tolerance of greater physiological strain by HA responders occurred in the absence of perceptual differences.
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Journal title: Journal of occupational and environmental medicine
Publication Date: 2016-12
Type: Journal Article
DOI: 10.1097/JOM.0000000000000902
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