Persistence of impaired heat tolerance from artificially induced miliaria rubra

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Abstract
Ten volunteers were heat acclimatized to 48.9.degree. C (Ta [ambient temperature]) 20% rh [relative humidity] for 7 days to complete a 100 min walk on a level treadmill (1.56 ms). Subjects were then divided into experimental (n = 6) and control (n = 4) groups. Miliaria rubra (heat rash) was induced in the experimental subjects by wrapping them for 3 days in polyethylene plastic. All 6 developed marked miliaria with involvement of 40-70% of the total body surface area. All subjects were reexposed to walking in the heat on the 7th day after unwrapping by which time rash was clinically indetectable, and again 14 days after unwrapping. On the 1st test (day 7) only 1 of the rashed group, and on the 2nd test (day 14) only 2 could complete the 100 min walk; the control group finished without difficulty on both days. Body heat storage for the rash group was 2.5 .apprx. that of the control group on day 7 and 1.5 .times. as great on day 14; measurements of mean body temperature (.hivin.Tb) on the rash group indicated a much greater heat stress when compared to their own prerash-acclimatized values or those of the control group. The potential of healed miliaria in the etiology of clinical heat illness is discussed.

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