Core Temperature and Heart Rate at the Upper Limit of the Prescriptive Zone

Details

• Personal Author:
  Ashley CD ; Bernard, Thomas E. ; Kenney WL ; Wolf ST
• Description:
  The expressed goal of limiting workplace heat stress exposures to a core temperature (Tc) of 38 degrees C traces back to a 1969 World Health Organization Technical Report (WHO Series 412). The actual goal was to limit exposures to the upper limit of the prescriptive zone (ULPZ). To explore the physiological strain at the ULPZ, progressive heat stress protocol data from Penn State University (PSU) and University of South Florida (USF) below and at the ULPZ were used to articulate the relation of Tc and heart rate (HR) to metabolic rate (MR) with consideration of acclimatization state, clothing, exposure condition (PreULPZ vs. ULPZ), and sex. Regression models demonstrated the association of MR and sex with Tc and HR. At the ULPZ, women had systematically higher values of Tc and HR than men at the same MR likely due to higher relative demands. There was no effect for acclimatization state and clothing. As expected for individuals, Tc was practically constant below the ULPZ and HR exhibited increasing values approaching the ULPZ. At 490 W, the high MR cited in the WHO document, the mean Tc for men was near the 38 degrees C limit with systematically lower Tc at lower MRs. [Description provided by NIOSH]
• Subjects:
  Cardiovascular System Heat Stress Disorders Hot Temperature Occupational Health Safety Temperature
• Keywords:
  Author Keywords: Heat Strain Body Temperature Heart Rate Heat Acclimatization Heat Stress Metabolic Rate Occupational Exposure Limit OEL Temperature Effects ULPZ, Upper Limit Of Prescriptive Zone WHO Report

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• ISSN:
  2051-817X
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Florida ; OSHA Region 3 ; OSHA Region 4 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  11
• Issue:
  17
• NIOSHTIC Number:
  nn:20068429
• Citation:
  Physiol Rep 2023 Sep; 11(17):e15812
• Contact Point Address:
  Thomas E. Bernard, College of Public Health, University of South Florida, Tampa, FL 33612
• Email:
  tbernar2@usf.edu
• Federal Fiscal Year:
  2023
• Performing Organization:
  University of South Florida, Tampa, Florida
• Peer Reviewed:
  True
• Start Date:
  20000930
• Source Full Name:
  Physiological Reports
• End Date:
  20040929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:b30a2c7031e74ba3b5b845e3e40311ae77b70086d2d422e7f0f0513a89c16d5c223a65a32016e53578bb4f2c980355f2ddfbd79837a71d5cdb3bf691eb420a43
• Download URL:
  https://stacks.cdc.gov/view/cdc/230585/cdc_230585_DS1.pdf
• File Type:
  [PDF - 1.15 MB ]