Accession Number : ADA309112

Title :   Evaluation of USARIEM Heat Strain Model: MOPP Level, Exercise Intensity in Desert and Tropic Climates.

Descriptive Note : Technical rept.,

Corporate Author : ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA

Personal Author(s) : Cadarette, Bruce S. ; Montain, Scott J. ; Kolka, Margaret A. ; Stroschein, Leander A. ; Matthew, William t.

PDF Url : ADA309112

Report Date : APR 1996

Pagination or Media Count : 55

Abstract : USARIEM has developed a series of models which predict physiologic strain (body temperature, heart rate sweating rate) and tolerance time to heat strain under a variety of conditions. These heat strain models have been incorporated into the P2NBC2 decision aid, JANUS, MERCURY and other military modeling efforts. The present study was conducted to fill-in information gaps for the database and provide validation of current algorithms. Specifically, this study reports physiologic information on the effects of: (1) light, moderate and hard exercise intensities; (2) MOPP 1 and MOPP 4; (3) desert (43 deg C (109 deg F), 20% rh) and tropic (35 deg C (95 deg F), 50% rh) climates. The physiologic information from these conditions were compared to values predicted by the ARIEM, HSDA and ARIEM-EXP (experimental) models. These experiments demonstrated: (1) harder work levels resulted in greater heat strain, which was more pronounced in MOPP 4 than in MOPP 1; (2) the energy cost of exercise and the heat strain was greater in MOPP 4 than MOPP 1 for the same task; (3) physiologic strain and tolerance times were similar during exercise in the two climates with matched WBGT temperatures; (4) the ARIEM and HSDA models were inaccurate in predicting the experimental core temperature responses, conservatively predicting core temperature responses, and over predicting tolerance time; (5) the ARIEM-EXP model accurately predicted core temperature responses, especially at moderate and hard exercise intensities, but it also over predicted tolerance time. These data indicate that the experimental model should replace the ARIEM and HSDA models to predict soldier responses in hot climates.

Descriptors :   *TROPICAL REGIONS, *HEART RATE, *HEAT STRESS(PHYSIOLOGY), *EXERCISE(PHYSIOLOGY), *HEAT TOLERANCE, DATA BASES, ALGORITHMS, TEMPERATURE, CORES, VALIDATION, MODELS, ARMY PERSONNEL, ENERGY, REPORTS, INTENSITY, RATES, TIME, COSTS, RESPONSE, STRAINS(BIOLOGY), TOLERANCE, CLIMATE, MERCURY, PHYSIOLOGY, PHYSICAL FITNESS, PROTECTIVE CLOTHING, DESERTS, TOLERANCES(PHYSIOLOGY), HOT REGIONS, BODY TEMPERATURE.

Subject Categories : Stress Physiology
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE