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Work performance at 40 degrees C with Canadian Forces biological and chemical protective clothing.
Aviat Space Environ Med. 1993 Dec; 64(12):1094-100.AS

Abstract

This study examined the effects of a hot environmental temperature (40 degrees C and 50% relative humidity) and metabolic rate on soldiers' tolerance time (TT) while wearing various levels of the Canadian Forces biological and chemical (BC) defence protective clothing. The subjects, 19 unacclimatized males, were assigned to exercise at either a light intermittent (LI) (N = 4), light continuous (LC) (N = 5), moderate continuous (MC) (N = 5) or heavy continuous (HC) (N = 5) metabolic rate. For groups LI and LC, exercise involved walking on a treadmill at 4.0 km.h-1 with a 0% grade and lifting 10 kg boxes. LI alternated between 15 min of exercise and 15 min of rest. Group MC walked at 4.8 km.h-1 with a 3% grade and lifted 15 kg boxes. Group HC walked at 4.8 km.h-1 with a 7.5% grade and lifted 20 kg. Subjects were tested wearing three levels of clothing protection: combat clothing (L); combat clothing and a semi-permeable BC overgarment (M); combat clothing and BC overgarment, gloves, boots and respirator (H). TT was the time until rectal temperature reached 39.3 degrees C, heart rate reached 95% maximum, dizziness or nausea precluded further exercise, or 5 h had elapsed. For group LI, TT was similar for L (137 +/- 15 min) and M (117 +/- 9 min) clothing. TT was significantly reduced for H (67 +/- 6 min) clothing. For group LC, TT was greater for L (91 +/- 11 min) compared with either M (68 +/- 7 min) or H (55 +/- 2 min) clothing.(

ABSTRACT

TRUNCATED AT 250 WORDS)

Authors+Show Affiliations

Defence and Civil Institute of Environmental Medicine, North York, Ont., Canada.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

8291988

Citation

McLellan, T M.. "Work Performance at 40 Degrees C With Canadian Forces Biological and Chemical Protective Clothing." Aviation, Space, and Environmental Medicine, vol. 64, no. 12, 1993, pp. 1094-100.
McLellan TM. Work performance at 40 degrees C with Canadian Forces biological and chemical protective clothing. Aviat Space Environ Med. 1993;64(12):1094-100.
McLellan, T. M. (1993). Work performance at 40 degrees C with Canadian Forces biological and chemical protective clothing. Aviation, Space, and Environmental Medicine, 64(12), 1094-100.
McLellan TM. Work Performance at 40 Degrees C With Canadian Forces Biological and Chemical Protective Clothing. Aviat Space Environ Med. 1993;64(12):1094-100. PubMed PMID: 8291988.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Work performance at 40 degrees C with Canadian Forces biological and chemical protective clothing. A1 - McLellan,T M, PY - 1993/12/1/pubmed PY - 1993/12/1/medline PY - 1993/12/1/entrez SP - 1094 EP - 100 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 64 IS - 12 N2 - This study examined the effects of a hot environmental temperature (40 degrees C and 50% relative humidity) and metabolic rate on soldiers' tolerance time (TT) while wearing various levels of the Canadian Forces biological and chemical (BC) defence protective clothing. The subjects, 19 unacclimatized males, were assigned to exercise at either a light intermittent (LI) (N = 4), light continuous (LC) (N = 5), moderate continuous (MC) (N = 5) or heavy continuous (HC) (N = 5) metabolic rate. For groups LI and LC, exercise involved walking on a treadmill at 4.0 km.h-1 with a 0% grade and lifting 10 kg boxes. LI alternated between 15 min of exercise and 15 min of rest. Group MC walked at 4.8 km.h-1 with a 3% grade and lifted 15 kg boxes. Group HC walked at 4.8 km.h-1 with a 7.5% grade and lifted 20 kg. Subjects were tested wearing three levels of clothing protection: combat clothing (L); combat clothing and a semi-permeable BC overgarment (M); combat clothing and BC overgarment, gloves, boots and respirator (H). TT was the time until rectal temperature reached 39.3 degrees C, heart rate reached 95% maximum, dizziness or nausea precluded further exercise, or 5 h had elapsed. For group LI, TT was similar for L (137 +/- 15 min) and M (117 +/- 9 min) clothing. TT was significantly reduced for H (67 +/- 6 min) clothing. For group LC, TT was greater for L (91 +/- 11 min) compared with either M (68 +/- 7 min) or H (55 +/- 2 min) clothing.(ABSTRACT TRUNCATED AT 250 WORDS) SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/8291988/Work_performance_at_40_degrees_C_with_Canadian_Forces_biological_and_chemical_protective_clothing_ L2 - https://medlineplus.gov/veteransandmilitaryhealth.html DB - PRIME DP - Unbound Medicine ER -