INFLUENCE OF MENSTRUAL CYCLE PHASE AND ORAL CONTRACEPTIVE USE DURING COMPENSABLE AND UNCOMPENSABLE HEAT STRAIN

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Authors
  1. Tenaglia, S.A.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Toronto Univ, Toronto ONT (CAN) Dept of Community Health
Abstract
Canadian Forces personnel must be able to sustain operations in an environment contaminated with nuclear, biological and chemical (NBC) agents. The impairment associated with wearing NBC protective clothing in hot environments has been studied for males. However, although women comprise approximately 10% of our Forces, the extent of the impairment in heat tolerance for women while wearing the NBC clothing has not been investigated. The purpose of this study was to determine the influence of menstrual cycle phase and oral contraceptive use during light exercise at 40C and 30% relative humidity while wearing combat clothing or the full NBC protective ensemble. Eighteen women (18-35 yr), who differed only with respect to oral contraceptive use (n=9) or non-use (n=9), participated. Thermoregulatory responses in each clothing configuration were compared during the early follicular (EF, days 2-5), late follicular (LF, days 9-12), and mid luteal (ML, days 19-22) phases of the menstrual cycle. Rectal temperature was elevated in ML compared with EF among the non-users, but not the users in both clothing configurations. There were no phase-related or group-related differences in any of the other indices of heat strain.Tolerance t imes were similar between the two groups in all three phases during the trials wearing the combat clothing and approximated 5 h. TRUNCATED
Keywords
Heat stress
Report Number
DCIEM-97-CR-21 — Contractor Report
Date of publication
15 Sep 1997
Number of Pages
154
DSTKIM No
98-00081
CANDIS No
506671
Format(s):
Hardcopy;Document Image stored on Optical Disk

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