Accession Number:

ADP012450

Title:

Application of a Computer Model to Set Heat Strain Threshold Limit Values: Evaluation During a Simulated Army Basic Combat Fitness Test

Descriptive Note:

Corporate Author:

QINETIQ LTD FARNBOROUGH (UNITED KINGDOM)

Report Date:

2002-04-01

Pagination or Media Count:

5.0

Abstract:

The risk of exertional heat illness during military activities can be reduced by setting Threshold Limit Values TLVs using Wet Bulb Globe Temperature WBGT index. A study was undertaken to investigate if computer predictions of heat strain were accurate enough to set TLVs for military activities. Physiological strain during a simulated Army Basic Combat Fitness Test treadmill walking at 6.8 kmh, 0 incline in a warm environment WBGT 24.3 deg C was assessed in 20 apparently healthy male soldiers with no history of heat illness. Measured environmental variables, metabolic heat production, subject anthropometry, and estimated clothing thermal and evaporative resistances, were entered into a rational heat strain model. The range in measured rectal temperature Tsub re at the end of exercise was 37.7 to 39.3 deg C Tsub re was correlated with exercise oxygen uptake rho 0.68, P 0.001. Differences between predicted and measured Tsub re after 60 minutes and at the end of the simulated Army Basic Combat Fitness Test, or point of subject withdrawal, were 0.18 1 SD 0.37 and 0.03 0.48 deg C respectively. It was concluded that computer predictions of heat strain have potential value for setting valid TLVs for military activities.

Subject Categories:

  • Stress Physiology
  • Computer Programming and Software
  • Logistics, Military Facilities and Supplies

Distribution Statement:

APPROVED FOR PUBLIC RELEASE