Wearing nuclear, biological and chemical (NBC) clothing or body armor during hot weather operations increases heat strain, can compromise work capacity ...
Form Approved OMB No. 0704-0188
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PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE
3. DATES COVERED (From - To)
September 2008
USARIEM Technical Report 4. TITLE AND SUBTITLE
5a. CONTRACT NUMBER
Physiological Responses to Exercise-Heat Stress with Prototype Pulsed Microclimate Cooling System
5b. GRANT NUMBER
5c. PROGRAM ELEMENT NUMBER
5d. PROJECT NUMBER
6. AUTHOR(S)
B.S. Cadarette, T.D. Chinevere, B.R. Ely, D.A. Goodman, B. Laprise, W. Teal, M.N. Sawka
5e. TASK NUMBER
5f. WORK UNIT NUMBER
8. PERFORMING ORGANIZATION REPORT NUMBER
7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)
Thermal & Mountain Medicine Division U.S. Army Research institute of Environmental Medicine Kansas Street Natick, MA 01760-507
T08-12
10. SPONSOR/MONITOR'S ACRONYM(S)
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)
Same as #7 above 11. SPONSOR/MONITOR'S REPORT NUMBER(S) 12. DISTRIBUTION/AVAILABILITY STATEMENT
Approved for public release; distribution is unlimited 13. SUPPLEMENTARY NOTES
14. ABSTRACT
Wearing nuclear, biological and chemical (NBC) clothing or body armor during hot weather operations increases heat strain, can compromise work capacity, and may lead to heat injury. The U.S. Army Natick Soldier Research, Development, and Engineering Center is working to develop a lightweight microclimate cooling system (MCCS) for dismounted Soldiers. This study evaluated a prototype, vapor compression MCCS with an integrated skin temperature sensor to trigger pulsed cooling (PC) cycles. Previous experiments showed PC to be as effective as continuous cooling (CC) while requiring less power, potentially reducing both weight and logistic requirements for MCCS. A 120 W prototype MCCS was tested on volunteers during continuous work wearing either NBC clothing or the Army Combat Uniform (ACU) with body armor. Trials were no cooling, CC, and PC from skin temperature feedback. Volunteers completed three trials at 30°C, 30% rh wearing NBC clothing, and three trials each at 45°C, 20% rh and 35°C, 70% rh wearing the ACU. Skin temperature, core temperature, heart rate, and sweating rate data were collected in all experiments to evaluate heat strain. We found that while the skin temperature feedback worked effectively, the prototype MCCS provided 15. SUBJECT TERMS insufficient cooling for our scenarios.
16. SECURITY CLASSIFICATION OF: a. REPORT b. ABSTRACT c. THIS PAGE
Unclassified
Unclassified
Unclassified
17. LIMITATION OF ABSTRACT
Unlimited
18. NUMBER 19a. NAME OF RESPONSIBLE PERSON OF Bruce S. Cadarette PAGES 19b. TELEPHONE NUMBER (Include area code)
31
508-233-4429
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Standard Form 298 (Rev. 8/98)
Prescribed by ANSI Std. Z39.18
