CONTINUOUS VS. INTERMITTENT WORK WITH CANADIAN FORCES NBC CLOTHING

Authors
  1. McLellan, T.M.
  2. Jacobs, I.
  3. Bain, J.B.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
The 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 (30C 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 10kg) 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 39.3C, heart rate reached 95% maximum, dizziness or nausea precluded further exercise, or 5 h had elapsed. Assuming a resting average metabolic rate of 4 ml.kg 1(-).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.
Report Number
DCIEM-92-23 — Reprint
Date of publication
01 Jul 1993
Number of Pages
4
Reprinted from
Aviation, Space, and Environmental Medicine, Vol 64, 1993, p595-598
DSTKIM No
93-03828
CANDIS No
134700
Format(s):
Hardcopy;Originator's fiche received by DSIS

Permanent link

Document 1 of 1

Date modified: