NDLI: Efficacy of body ventilation system for reducing strain in warm and hot climates

Content Provider	Springer Nature Link
Author	Chinevere, Troy D. Cadarette, Bruce S. Goodman, Daniel A. Ely, Brett R. Cheuvront, Samuel N. Sawka, Michael N.
Copyright Year	2008
Abstract	This study determined whether a torso-vest forced ambient air body ventilation system (BVS) reduced physiological strain during exercise-heat stress. Seven heat-acclimated volunteers attempted nine, 2-h treadmill walks at 200 W m−2 in three environments, −40°C, 20% rh (HD), 35°C, 75% rh (HW), and 30°C, 50% rh, (WW) wearing the Army Combat Uniform, interceptor body armor (IBA) and Kevlar helmet. Three trials in each environment were BVS turned on (BVSOn), BVS turned off (BVSOff), and no BVS (IBA). In HD, BVSOn significantly lowered core temperature (T re), heart rate (HR), mean skin temperature (T sk), mean torso skin temperature (T torso), thermal sensation (TS), heat storage (S), and physiological strain index (PSI), versus BVSOff and IBA (P < 0.05). For HW (n = 6), analyses were possible only through 60 min. Exercise tolerance time (min) during HW was significantly longer for BVSOn (116 ± 10 min) versus BVSOff (95 ± 22 min) and IBA (96 ± 18 min) (P < 0.05). During HW, BVSOn lowered HR at 60 min versus IBA, T sk from 30 to 60 min versus BVSOff and IBA, and PSI from 45 to 60 min versus BVSOff and at 60 min versus IBA (P < 0.05). BVSOn changes in T re and HR were lower in HD and HW. During WW, BVSOn significantly lowered HR, T sk, and T torso versus BVSOff and IBA (P < 0.05) during late exercise. Sweating rates were significantly lower for BVSOn versus BVSOff and IBA in both HD and WW (P < 0.05), but not HW. These results indicate that BVSOn reduces physiological strain in all three environments by a similar amount; however, in hot-dry conditions the BVSOff increases physiological strain.
Starting Page	307
Ending Page	314
Page Count	8
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	103
Issue Number	3
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-03-08
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ambient air ventilation Convection Evaporation Sports Medicine Occupational Medicine/Industrial Medicine Human Physiology
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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