Accession Number : ADA270776

Title :   Thermal Stress in Seven Types of Chemical Defense Ensembles During Moderate Exercise in Hot Environments

Descriptive Note : Final rept. May 1991-Jul 1992

Corporate Author : ARMSTRONG LAB BROOKS AFB TX

Personal Author(s) : Bomalaski, Susan H. ; Hengst, Richard ; Constable, Stefan H.

PDF Url : ADA270776

Report Date : AUG 1993

Pagination or Media Count : 22

Abstract : United States Air Force -(USAF) personnel must perform their duties in many operational environments, including those with the potential for contamination with toxic chemical warfare (CW) agents. This study evaluated the physiological response to thermal stress in subjects performing moderate work in current and prototype chemical protective garments including the Battle Dress Overgarment (BDO)+BDU, BDO without BDU, United Kingdom (UK) undercoverall+BDU, Gore-Tex rainsuit+PJ-7 undercoverall, Marine Light Fighter Suit (MLFS), CWU77P, PJ-7 alone, and the BDU alone. Experimental conditions were dry bulb temperature of 40 deg C (104 deg F), a wet bulb temperature of 270C (80.6 deg F), and a black globe temperature of 450C (113 deg F). Eleven subjects walked on a treadmill at 3 mph with a 5% grade incline until rectal temperature (Tre) rose 1.5 deg C (2.7 deg F) above the starting value. Heart rate, rectal and mean skin temperature, and body heat storage were monitored continuously. Sweat evaporation and production were determined from the differences between pre- and postexperiment clothed and nude weights. Significantly longer work times, lower heart rates, lower Tmsk, and lower heat storage, were seen in the group comprised of the BDU, MLFS, CWU-77P, and PJ-7 compared to the Gore-Tex with PJ- 7, UK plus BD BDO+BDU, and BDO no BDU ensembles. Suits which resulted in shorter tolerance times also caused rates of sweat production and lower % sweat evaporation than the less physiologically burdensome suits. Chemical protective ensembles, Thermal stress, Clothing, Exercise.

Descriptors :   *CHEMICAL WARFARE, *PROTECTIVE CLOTHING, *THERMAL STRESSES, *HEAT STRESS(PHYSIOLOGY), AIR FORCE, UNITED STATES, ENVIRONMENTS, PRODUCTION, LIGHT, PROTOTYPES, TREES, RESPONSE, WEIGHT, TOLERANCE, PERSONNEL, WORK, VALUE, MEAN, STORAGE, EVAPORATION, CONTAMINATION, HEAT, STARTING, CLOTHING, BATTLES, IN VIVO ANALYSIS, HEART RATE, BODIES, UNITED STATES AIR FORCE ACADEMY, WET BULB TEMPERATURE, EXERCISE(PHYSIOLOGY), TREADMILLS.

Subject Categories : Stress Physiology
      Military Operations, Strategy and Tactics
      Protective Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE