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

Details

• Personal Author:
  Coca, Aitor ; Kim J-H ; Powell JB ; Quinn TD ; Roberge RJ ; Seo Y
• 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 degrees 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 degrees 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 degrees C vs. 37.6+/-0.5 degrees C), body temperature (38.6+/-0.4 degrees C vs. 38.3+/-0.4 degrees 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. [Description provided by NIOSH]
• Subjects:
  Chemistry Environmental Exposure Heat Stress Disorders Hot Temperature Humidity Men Occupational Health Personal Protective Equipment Protective Clothing Radiation Risk Assessment Risk Factors Safety Staff Development Temperature

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• Keywords:
  Author Keywords: Heat Stress Test Biological Materials Chemical Properties Chemical Protective Clothing Exposure Levels Heat Heat Acclimatization Heat Exposure Heat Stress Humans Hyperthermia Nuclear Properties Occupational Hazards Personal Protective Equipment Physiological Effects Physiology PPE Radiological Equipment Risk Factors Temperature Effects Thermal Effects Thermal Reactions Thermoregulation Training

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• ISSN:
  2640-2572
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  NPPTL - National Personal Protective Technology Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-10
• Volume:
  1
• Issue:
  1
• NIOSHTIC Number:
  nn:20051418
• Citation:
  J Exer Nutr 2018 Jan; 1(1):1-10
• Contact Point Address:
  Aitor Coca, National Personal Protective Technology Laboratory, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Pittsburgh, Pennsylvania
• Email:
  aitorcocanunez@gmail.com
• Federal Fiscal Year:
  2018
• NORA Priority Area:
  Public Safety
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Exercise and Nutrition
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:168fecf3909bc15db3e54b254be4c233a06c78c95b8a9ce9953eca079221a170bae22b74366900f6718dc74c8e722166ebe02d23e329e792e39a8d5d9a97878c
• Download URL:
  https://stacks.cdc.gov/view/cdc/211384/cdc_211384_DS1.pdf
• File Type:
  [PDF - 376.88 KB ]