Heat reactions of male and female Caucasians

Abstract

Thirty male and twenty-six female Caucasians were tested at work levels of 1.0 liters O2 consumption in 90 F wet-bulb temperature, 93 F dry-bulb temperature, and 80 ft/min air velocity for comparative heat reactions in the unacclimatized state. The females had more severe physiological and psychological reactions. Rectal temperatures of 104 F and heart rates of 180 beat/min were reached more rapidly than in the male. The females sweated less and their oxygen consumptions were lower than those of the males. Ten males and four females were then acclimatized to the same extent at the same work rate in 93 F wet-bulb temperature. At the end of the period their reactions were closely similar, although the females responded slower to the acclimatization procedure. Both groups ended with heart rates of 140 beat/min and rectal temperatures of 102 F. The females, however, continued to sweat less. In a retest at 90 F wet-bulb temperature, both groups had heart rates of 130–140 beat/min and rectal temperatures of 101 F. Females still sweated less. The results demonstrate the fact that females react more severely on exposure to severe heat and work conditions. Once acclimatized, however, the temperature and circulatory reactions of both sexes are closely similar, but the females sweat less than males. acclimatization of Caucasians to heat; Caucasians—acclimatization to heat; sex differences—heat reactions; physiological reactions to heat Submitted on September 14, 1964

BIOTEX—Biosensing Textiles for Personalised Healthcare Management

“…Sweat rates ranged from 4 to 8.3 mg/min. Female subjects tended to have lower sweat rates compared to males, which is well established [22]. Lower sweat rate affects the time for sweat to reach the sensors, and if the flow rate is too low, there is not adequate fluid to wet the sensors on the kapton layer that touch the surface of the fabric channel.…”

Male and female upper body sweat distribution during running measured with technical absorbents

“…There was a significant shown in Fig. 3, with significant differences in sweat production for different zones within It is difficult to find a physiological explanation for the strong regional variation of sweat 8 rates, especially the torso versus periphery difference that is observed here and in the The technique used in the present study, absorbents, had been used before, but to our 1 knowledge this was the first study to use new Technical Absorbents and also the first using 2 these over larger body areas simultaneously. Most studies in literature followed different sweat rates with overall body sweat rate.…”

Physiological responses of physically fit men and women to acclimation to humid heat

“…Higher HR's and core temperatures during an acute heat exposure have been found in women performing the same absolute work load as men (12,24).…”

“…Women have usually been deemed less able to cope with an acute heat exposure since their sweat rates are substantially lower than those of men (8,12,24) However, In studies In which men and women were compared after acclimation, the conventional indicators of physiological stress (I.e., rectal tempera ture (I re ) anc~ heart rate (KR)) were similar despite the lower rates of sweating In the women (2 1,24). The emphasis, therefore, appears to have been mainly with the quantity of sweat secreted and not necessarily with the efficiency of the sweating process.…”