Summary: Disabled Submarine Heat Stress Conference
Abstract
This document summarizes the Disabled Submarine Heat Stress Conference that was held at the Naval Submarine Medical Research Laboratory, Groton, Connecticut, on 22 June 2004. In the discussion of heat stress measurement, the consensus of the panel was that standard wet globe bulb temperature devices were not needed in DISSUB conditions, since radiation (no solar load) was not a significant factor. In DISSUB conditions only two factors need determination: ambient heat and humidity. These parameters can be measured by several methods: temperature by dry bulb thermometer and humidity using either a sling psychrometer or a portable battery-powered electronic device providing a direct readout of measurements. Determination of safe-to-stay, when-to-escape conditions was discussed at length. Dr. Sawka produced a chart of temperature/humidity conditions that he recommended for use in DISSUB conditions. This chart, which graphs wet and dry bulb temperatures, sets forth effective temperature zones of comfort, discomfort, and temperature regulation failure. In DISSUB scenarios, cognition and hypotension are the most critical factors relevant to heat stress assessment and physiological functioning. Of the two, hypotension is most likely the first affected in hot DISSUB conditions. The consensus of the panel was that 1 liter of water per day was the minimal requirement but that in hot conditions up to 4 liters or more of water per day might be required for optimal hydration. As a heat stress mitigating action, limb immersion in cool or even ambient temperature water may provide substantial heat stress relief in terms of both providing comfort and reducing core temperature. The development of hypotension or confusion in a DISSUB crew member may have causes other than dehydration that deserve investigation or consideration. Principal components of heat stress casualty treatment in DISSUB scenarios include delivery of fluids, orally or intravenously, and reducing body heat.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 11, 2009
- Accession Number
- ADA506748
Entities
People
- Wayne G. Horn
Organizations
- Naval Submarine Medical Research Laboratory