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Continuous vs. intermittent work with Canadian Forces NBC clothing.
Aviat Space Environ Med. 1993 Jul; 64(7):595-8.AS

Abstract

This study examined the benefits of work and rest schedules on soldiers' work tolerance (WTT) while wearing various levels of nuclear, biological and chemical (NBC) defence protective clothing in a warm environment (30 degrees C and 50% R.H.). Eight unacclimatized males were assigned to exercise at either a light (walking 1.11 m.s-1 0% grade, alternating with lifting 10 kg) or heavy metabolic rate (walking 1.33 m.s-1 7.5% grade, alternating with lifting 20 kg). Subjects were tested wearing three levels of clothing protection: combat clothing (L); combats and a semi-permeable NBC overgarment with the hood down (M); combats and NBC overgarment, gloves, boots and respirator (H). For each clothing configuration, subjects were evaluated using both a "continuous" exercise protocol and an intermittent work and rest schedule. WTT was defined as the time until rectal temperature (Tre) reached 39.3 degrees C, heart rate reached 95% maximum, dizziness or nausea precluded further exercise, or 5 h had elapsed. Assuming a resting VO2 of 4 ml.kg-1 x min-1 an average metabolic rate was calculated for all trials. A decreasing hyperbolic function described the relationship between WTT and metabolic rate for M and H. These relationships facilitate quantification of appropriate work and rest schedules if the metabolic rate of a task is known.

Authors+Show Affiliations

Defence and Civil Institute of Environmental Medicine, North York, Ontario, Canada.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

8357311

Citation

McLellan, T M., et al. "Continuous Vs. Intermittent Work With Canadian Forces NBC Clothing." Aviation, Space, and Environmental Medicine, vol. 64, no. 7, 1993, pp. 595-8.
McLellan TM, Jacobs I, Bain JB. Continuous vs. intermittent work with Canadian Forces NBC clothing. Aviat Space Environ Med. 1993;64(7):595-8.
McLellan, T. M., Jacobs, I., & Bain, J. B. (1993). Continuous vs. intermittent work with Canadian Forces NBC clothing. Aviation, Space, and Environmental Medicine, 64(7), 595-8.
McLellan TM, Jacobs I, Bain JB. Continuous Vs. Intermittent Work With Canadian Forces NBC Clothing. Aviat Space Environ Med. 1993;64(7):595-8. PubMed PMID: 8357311.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Continuous vs. intermittent work with Canadian Forces NBC clothing. AU - McLellan,T M, AU - Jacobs,I, AU - Bain,J B, PY - 1993/7/1/pubmed PY - 1993/7/1/medline PY - 1993/7/1/entrez SP - 595 EP - 8 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 64 IS - 7 N2 - This study examined the benefits of work and rest schedules on soldiers' work tolerance (WTT) while wearing various levels of nuclear, biological and chemical (NBC) defence protective clothing in a warm environment (30 degrees C and 50% R.H.). Eight unacclimatized males were assigned to exercise at either a light (walking 1.11 m.s-1 0% grade, alternating with lifting 10 kg) or heavy metabolic rate (walking 1.33 m.s-1 7.5% grade, alternating with lifting 20 kg). Subjects were tested wearing three levels of clothing protection: combat clothing (L); combats and a semi-permeable NBC overgarment with the hood down (M); combats and NBC overgarment, gloves, boots and respirator (H). For each clothing configuration, subjects were evaluated using both a "continuous" exercise protocol and an intermittent work and rest schedule. WTT was defined as the time until rectal temperature (Tre) reached 39.3 degrees C, heart rate reached 95% maximum, dizziness or nausea precluded further exercise, or 5 h had elapsed. Assuming a resting VO2 of 4 ml.kg-1 x min-1 an average metabolic rate was calculated for all trials. A decreasing hyperbolic function described the relationship between WTT and metabolic rate for M and H. These relationships facilitate quantification of appropriate work and rest schedules if the metabolic rate of a task is known. SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/8357311/Continuous_vs__intermittent_work_with_Canadian_Forces_NBC_clothing_ L2 - https://medlineplus.gov/veteransandmilitaryhealth.html DB - PRIME DP - Unbound Medicine ER -