Thermal-work strain during Marine rifle squad operations in Afghanistan.

Abstract:

:The physiological burden created by heat strain and physical exercise, also called thermal-work strain, was quantified for 10 male Marines (age 21.9 ± 2.3 years, height 180.3 ± 5.2 cm, and weight 85.2 ± 10.8 kg) during three dismounted missions in Helmand Province, Afghanistan. Heart rate (HR) and core body temperature (T core) were recorded every 15 seconds (Equivital EQ-01; Hidalgo, Cambridge, United Kingdom) during periods of light, moderate, and heavy work and used to estimate metabolic rate. Meteorological measures, clothing characteristics, anthropometrics, and estimated metabolic rates were used to predict T core for the same missions during March (spring) and July (summer) conditions. Thermal-work strain was quantified from HR and T core values using the Physiological Strain Index (PSI) developed by Moran et al. July PSI and T core values were predicted and not observed due to lack of access to in-theater warfighters at that time. Our methods quantify and compare the predicted and observed thermal-work strain resulting from environment and worn or carried equipment and illustrate that a small increase in ambient temperature and solar load might result in increased thermal-work strain.

journal_name

Mil Med

journal_title

Military medicine

authors

Welles AP,Buller MJ,Margolis L,Economos D,Hoyt RW,Richter MW

doi

10.7205/MILMED-D-12-00538

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

1141-8

issue

10

eissn

0026-4075

issn

1930-613X

journal_volume

178

pub_type

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