Effects of 5-Day Heat Acclimation on Workers Wearing Personal Protective Clothing

Details

• Alternative Title:
  J Exerc Nutr
• Personal Author:
  Seo, Yongsuk ; Quinn, Tyler D. ; Kim, Jung-Hyun ; Powell, Jeffrey B. ; Roberge, Raymond J. ; Coca, Aitor
• Description:
  Introduction:
  
  Elevated ambient temperature and personal protective clothing (PPC) induce physiological strain which may be counteracted by heat acclimation. The purpose of this study was to determine if 5-day heat acclimation training (HAT) improves thermal and perceptual responses while wearing chemical, biological, radiological, and nuclear (CBRN) PPC.
  
  Methods:
  
  Nine healthy men completed a heat stress test (walking for one hour with CBRN PPC) in 35°C and 50% relative humidity (RH) before and after 5-day HAT. The HAT consisted of five consecutive days of two 45-minute cycling sessions (50% VO2max) wearing athletic clothing separated by a 15 min rest in 45°C and 20% RH. Results of the pre- and post-HAT heat stress tests were compared.
  
  Results:
  
  Heat acclimation was seen through 5-day HAT; however, thermoregulatory responses did not improve while wearing CBRN PPC. Improvement (p<0.05, day 1 vs. day 5 HAT) in skin temperature (38.0±0.5°C vs. 37.6±0.5°C), body temperature (38.6±0.4°C vs. 38.3±0.4°C), sweat rate (2.26±0.3kg vs. 2.64±0.3kg), RPE (15.8±2.4 vs. 13.9±3.1), and heat perception (5.7±0.6 vs. 4.9±1.0) were noted. However, no physiological or perceptual improvements (p>0.05) were found in the post-HAT heat stress test.
  
  Conclusions:
  
  Heat acclimation adaptations may be blunted by CBRN PPC, thus requiring differing or extended HAT.
  
  
• Subjects:
  Article Heat Stress Test Hyperthermia Occupational Hazards
• Source:
  J Exerc Nutr. 1(1):1
• Pubmed ID:
  37207025
• Pubmed Central ID:
  PMC10194072
• Document Type:
  Journal Article
• Funding:
  CC999999/ImCDC/Intramural CDC HHSUnited States/
• Volume:
  1
• Issue:
  1
• Collection(s):
  CDC Public Access
• Main Document Checksum:
  urn:sha256:a883fb5547b08bfc366f64b824125f5bf11aa2506cf2bf27b87547c7d3982cc3
• Download URL:
  https://stacks.cdc.gov/view/cdc/128770/cdc_128770_DS1.pdf
• File Type:
  [PDF - 95.35 KB ]