Accession Number:

ADA446078

Title:

Initial Capability Decision Aid (ICDA) Thermal Prediction Model and its Validation

Descriptive Note:

Technical rept.

Corporate Author:

ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA BIOPHYSICS AND BIOMEDICAL MODELING DIV

Personal Author(s):

Report Date:

2006-01-01

Pagination or Media Count:

41.0

Abstract:

The ICDA Initial Capability Decision Aid is a heat stress prediction model recently developed for monitoring the physiological status of Soldiers. ICDA utilizes real time input of metabolic activity derived from heart rate and air temperature. The model validation was conducted using data from three laboratory studies with varied environments i.e., 27 deg C75RH 49 deg Cl8 35 deg C45, clothing configurations and heat acclimation status. Subjects walked on a treadmill at 270-628 W for up to 180 min, depending upon study conditions. Root Mean Square Deviation RMSD between measured and predicted core temperature Tcr ranged between -0.11 and -0.50 deg C for these studies. The model predicted measured values of Tcr within one standard deviation, when environmental conditions were less stressful. Errors of estimates were larger with small sample size N5. The ICDA predictions of skin temperature were less accurate than those of Tcr. ICDA predictions of sweat rates SR were more accurate when environmental conditions were, in terms of heat stress, less extreme. However, for encapsulated subjects, working in a 35 deg C45RH environment, the results for predictions of SR were mixed. This model shows promising prediction of thermal status, particularly Tcr, of Soldiers during heat stress. This non-invasive model is convenient for health assessment of Soldiers required to perform different tasks for long hours.

Subject Categories:

  • Stress Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE