Extending work tolerance time in the heat in protective ensembles with pre- and per-cooling methods

Maley, Matthew J., Minett, Geoffrey M., Bach, Aaron J.E., Stewart, Kelly L., & Stewart, Ian B. (2020) Extending work tolerance time in the heat in protective ensembles with pre- and per-cooling methods. Applied Ergonomics, 85, Article number: 103064 1-6.

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Objectives: Investigate whether a range of cooling methods can extend tolerance time and/or reduce physiological strain in those working in the heat dressed in a Class 2 chemical, biological, radiological, nuclear (CBRN) protective ensemble. Methods: Eight males wore a Class 2 CBRN ensemble and walked for a maximum of 120 min at 35 °C, 50% relative humidity. In a randomised order, participants completed the trial with no cooling and four cooling protocols: 1) ice-based cooling vest (IV), 2) a non-ice-based cooling vest (PCM), 3) ice slushy consumed before work, combined with IV (SLIV) and 4) a portable battery-operated water-perfused suit (WPS). Mean with 95% confidence intervals are presented. Results: Tolerance time was extended in PCM (46 [36, 56] min, P = 0.018), SLIV (56 [46, 67] min, P < 0.001) and WPS (62 [53, 70] min, P < 0.001), compared with control (39 [30, 48] min). Tolerance time was longer in SLIV and WPS compared with both IV (48 [39, 58 min]) and PCM (P ≤ 0.011). After 20 min of work, HR was lower in SLIV (121 [105, 136] beats·min−1), WPS (117 [101, 133] beats·min−1) and IV (130 [116, 143] beats·min−1) compared with control (137 [120, 155] beats·min−1) (all P < 0.001). PCM (133 [116, 151] beats·min−1) did not differ from control. Conclusion: All cooling methods, except PCM, utilised in the present study reduced cardiovascular strain, while SLIV and WPS are most likely to extend tolerance time for those working in the heat dressed in a Class 2 CBRN ensemble.

Impact and interest:

10 citations in Scopus

5 citations in Web of Science®

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ID Code:

196930

Item Type:

Contribution to Journal (Journal Article)

Refereed:

Yes

ORCID iD:

Maley, Matthew J.	orcid.org/0000-0001-5200-7640
Minett, Geoffrey M.	orcid.org/0000-0003-4617-2820
Bach, Aaron J.E.	orcid.org/0000-0002-5581-5018
Stewart, Kelly L.	orcid.org/0000-0002-3386-7001
Stewart, Ian B.	orcid.org/0000-0003-1741-718X

Additional Information:

Funding: This project is financially supported by the United States Government through the United States Department of Defense (DOD). Financial support by DOD does not constitute an express or implied endorsement of the results or conclusions of the project by DOD. The funders had no role in study design, data collection, and analysis, decision to publish or preparation of the manuscript.

Measurements or Duration:

6 pages

Keywords:

Body cooling, Cardiovascular strain, Heat stress, Occupational, Thermal strain, Thermoregulation

DOI:

10.1016/j.apergo.2020.103064

ISSN:

0003-6870

Pure ID:

48466861

Divisions:

Past > QUT Faculties & Divisions > Faculty of Health
Past > Institutes > Institute of Health and Biomedical Innovation

Funding Information:

This project is financially supported by the United States Government through the United States Department of Defense (DOD) . Financial support by DOD does not constitute an express or implied endorsement of the results or conclusions of the project by DOD. The funders had no role in study design, data collection, and analysis, decision to publish or preparation of the manuscript.

2020 Elsevier Ltd

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Deposited On:

05 Mar 2020 10:03

Last Modified:

01 Aug 2024 20:33

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