Physiological tolerance times while wearing explosive ordnance disposal protective clothing in simulated environmental extremes.

Explosive ordnance disposal (EOD) technicians are required to wear protective clothing to protect themselves from the threat of overpressure, fragmentation, impact and heat. The engineering requirements to minimise these threats results in an extremely heavy and cumbersome clothing ensemble that inc...

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Autores principales:	Ian B Stewart, Kelly L Stewart, Charles J Worringham, Joseph T Costello
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a71484c7ac4748f0b04e017c7908108c
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spelling	oai:doaj.org-article:a71484c7ac4748f0b04e017c7908108c2021-11-18T08:31:39ZPhysiological tolerance times while wearing explosive ordnance disposal protective clothing in simulated environmental extremes.1932-620310.1371/journal.pone.0083740https://doaj.org/article/a71484c7ac4748f0b04e017c7908108c2014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24586228/?tool=EBIhttps://doaj.org/toc/1932-6203Explosive ordnance disposal (EOD) technicians are required to wear protective clothing to protect themselves from the threat of overpressure, fragmentation, impact and heat. The engineering requirements to minimise these threats results in an extremely heavy and cumbersome clothing ensemble that increases the internal heat generation of the wearer, while the clothing's thermal properties reduce heat dissipation. This study aimed to evaluate the heat strain encountered wearing EOD protective clothing in simulated environmental extremes across a range of differing work intensities. Eight healthy males [age 25 ± 6 years (mean ± sd), height 180 ± 7 cm, body mass 79 ± 9 kg, VO2max 57 ± 6 ml(.) kg(-1.)min(-1)] undertook nine trials while wearing an EOD9 suit (weighing 33.4 kg). The trials involved walking on a treadmill at 2.5, 4 and 5.5 km ⋅ h(-1) at each of the following environmental conditions, 21, 30 and 37 °C wet bulb globe temperature (WBGT) in a randomised controlled crossover design. The trials were ceased if the participants' core temperature reached 39 °C, if heart rate exceeded 90% of maximum, if walking time reached 60 minutes or due to fatigue/nausea. Tolerance times ranged from 10-60 minutes and were significantly reduced in the higher walking speeds and environmental conditions. In a total of 15 trials (21%) participants completed 60 minutes of walking; however, this was predominantly at the slower walking speeds in the 21 °C WBGT environment. Of the remaining 57 trials, 50 were ceased, due to attainment of 90% maximal heart rate. These near maximal heart rates resulted in moderate-high levels of physiological strain in all trials, despite core temperature only reaching 39 °C in one of the 72 trials.Ian B StewartKelly L StewartCharles J WorringhamJoseph T CostelloPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 2, p e83740 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ian B Stewart Kelly L Stewart Charles J Worringham Joseph T Costello Physiological tolerance times while wearing explosive ordnance disposal protective clothing in simulated environmental extremes.
description	Explosive ordnance disposal (EOD) technicians are required to wear protective clothing to protect themselves from the threat of overpressure, fragmentation, impact and heat. The engineering requirements to minimise these threats results in an extremely heavy and cumbersome clothing ensemble that increases the internal heat generation of the wearer, while the clothing's thermal properties reduce heat dissipation. This study aimed to evaluate the heat strain encountered wearing EOD protective clothing in simulated environmental extremes across a range of differing work intensities. Eight healthy males [age 25 ± 6 years (mean ± sd), height 180 ± 7 cm, body mass 79 ± 9 kg, VO2max 57 ± 6 ml(.) kg(-1.)min(-1)] undertook nine trials while wearing an EOD9 suit (weighing 33.4 kg). The trials involved walking on a treadmill at 2.5, 4 and 5.5 km ⋅ h(-1) at each of the following environmental conditions, 21, 30 and 37 °C wet bulb globe temperature (WBGT) in a randomised controlled crossover design. The trials were ceased if the participants' core temperature reached 39 °C, if heart rate exceeded 90% of maximum, if walking time reached 60 minutes or due to fatigue/nausea. Tolerance times ranged from 10-60 minutes and were significantly reduced in the higher walking speeds and environmental conditions. In a total of 15 trials (21%) participants completed 60 minutes of walking; however, this was predominantly at the slower walking speeds in the 21 °C WBGT environment. Of the remaining 57 trials, 50 were ceased, due to attainment of 90% maximal heart rate. These near maximal heart rates resulted in moderate-high levels of physiological strain in all trials, despite core temperature only reaching 39 °C in one of the 72 trials.
format	article
author	Ian B Stewart Kelly L Stewart Charles J Worringham Joseph T Costello
author_facet	Ian B Stewart Kelly L Stewart Charles J Worringham Joseph T Costello
author_sort	Ian B Stewart
title	Physiological tolerance times while wearing explosive ordnance disposal protective clothing in simulated environmental extremes.
title_short	Physiological tolerance times while wearing explosive ordnance disposal protective clothing in simulated environmental extremes.
title_full	Physiological tolerance times while wearing explosive ordnance disposal protective clothing in simulated environmental extremes.
title_fullStr	Physiological tolerance times while wearing explosive ordnance disposal protective clothing in simulated environmental extremes.
title_full_unstemmed	Physiological tolerance times while wearing explosive ordnance disposal protective clothing in simulated environmental extremes.
title_sort	physiological tolerance times while wearing explosive ordnance disposal protective clothing in simulated environmental extremes.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/a71484c7ac4748f0b04e017c7908108c
work_keys_str_mv	AT ianbstewart physiologicaltolerancetimeswhilewearingexplosiveordnancedisposalprotectiveclothinginsimulatedenvironmentalextremes AT kellylstewart physiologicaltolerancetimeswhilewearingexplosiveordnancedisposalprotectiveclothinginsimulatedenvironmentalextremes AT charlesjworringham physiologicaltolerancetimeswhilewearingexplosiveordnancedisposalprotectiveclothinginsimulatedenvironmentalextremes AT josephtcostello physiologicaltolerancetimeswhilewearingexplosiveordnancedisposalprotectiveclothinginsimulatedenvironmentalextremes
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Physiological tolerance times while wearing explosive ordnance disposal protective clothing in simulated environmental extremes.

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