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

Avellini, Barbara A.; Kamon, E.; Krajewski, Janet T.

doi:10.1152/jappl.1980.49.2.254

Cited by 140 publications

(107 citation statements)

References 9 publications

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“…Avellini et al [2] observed a significantly higher increase in the whole-body sweat rate in men than in women (35% vs. 15%) after 10 days of adaptation to humid heat. Mehnert et al [27] reported highly significant sex-related differences in sweat rates.…”

Section: Discussionmentioning

confidence: 96%

“…Numerous studies analysing differences between the sexes demonstrated a much higher increase in whole-body sweat rate in men than in women as the result of adaptation to humid heat [2,4,8,45]. Avellini et al [2] observed a significantly higher increase in the whole-body sweat rate in men than in women (35% vs. 15%) after 10 days of adaptation to humid heat.…”

Section: Discussionmentioning

confidence: 99%

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Sauna-induced body mass loss in physically inactive young women and men

Podstawski

Boraczyński

et al. 2016

Biomedical Human Kinetics

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SummaryStudy aim: The aim of this study was to evaluate the relationship between basic somatic features (body mass and height) and body mass loss in physically inactive young women and men exposed to thermal stress in a dry sauna. Materials and methods:The research was conducted in 2015 on 685 first-year full-time students (333 women, 352 men), aged 19-20 years old. Nude body mass was measured after the students dried off before and after using the sauna.Results: An analysis of regression equations indicated that an increase in the body mass of women and men leads to a significant increase in sauna-induced body mass loss. On the other hand, body mass loss decreased with an increase in height in women and men, but to a smaller extent. From among the tested somatic features, body height and body mass, body mass had a decisive influence on body mass loss. Body height had a minimal and statistically non-significant impact on body mass loss. Conclusions:The results of this study indicate that heavier individuals have an increased risk of dehydration and hyperthermia. Therefore, they should pay close attention to replenishing fluids lost in the sauna. The determination of body mass loss values after a visit to a dry sauna has practical significance because it supports the estimation of the fluid volume required for the maintenance of correct water balance.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Sauna-induced body mass loss in physically inactive young women and men

Podstawski

Boraczyński

et al. 2016

Biomedical Human Kinetics

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“…HEAT LOSS RESPONSES, SUCH as sweating and cutaneous vasodilation, during exercise in women differ from those in men because female hormones modify the responses after puberty (3). All studies of the effects of the menstrual cycle on heat loss responses during exercise have demonstrated that the core body temperature thresholds for sweating and cutaneous vasodilation are higher during the luteal phase of the menstrual cycle than during the follicular phase (14,15,17,18,23,31,33,35).…”

mentioning

confidence: 99%

Effects of menstrual cycle and physical training on heat loss responses during dynamic exercise at moderate intensity in a temperate environment

Kuwahara¹,

Inoue²,

Abe³

et al. 2005

American Journal of Physiology-Regulatory, Integrative and Comp

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. Effects of menstrual cycle and physical training on heat loss responses during dynamic exercise at moderate intensity in a temperate environment. Am J Physiol Regul Integr Comp Physiol 288: R1347-R1353, 2005. First published January 27, 2005 doi:10.1152/ajpregu.00547.2004.-We evaluated the effects of the menstrual cycle and physical training on heat loss (sweating and cutaneous vasodilation) responses during moderate exercise in a temperate environment. Ten untrained (group U) and seven endurance-trained (group T) women (maximal O2 uptake of 36.7 Ϯ 1.1 vs. 49.4 Ϯ 1.7 ml ⅐ kg Ϫ1 ⅐ min Ϫ1 , respectively; P Ͻ 0.05) performed a cycling exercise at 50% maximal O 2 uptake for 30 min during both the midfollicular and midluteal menstrual phase in a temperate environment (ambient temperature of 25°C, relative humidity of 45%). In group U, plasma levels of estrone, estradiol, and progesterone at rest and esophageal temperature (Tes) during exercise were significantly higher during the midluteal than during the midfollicular phase (P Ͻ 0.05). Sweating rate and cutaneous blood flow (measured via laserDoppler flowmetry) on the chest, back, forearm, and thigh were lower during the midluteal than during the midfollicular phase during exercise. Tes threshold for heat loss responses was significantly higher and sensitivity of the heat loss responses was significantly lower in the midluteal than in the midfollicular phase, regardless of body site. These effects of the menstrual cycle in group U were not observed in group T. The sweating rate and cutaneous blood flow were significantly higher in group T than in group U, regardless of menstrual phase or body site. Tes threshold for heat loss responses was significantly lower and sensitivity of heat loss responses was significantly greater in group T than in group U in the midluteal phase; however, sensitivity of the sweating response was significantly greater in the midfollicular phase. These results suggest that heat loss responses in group U were inhibited in the midluteal phase compared with in the midfollicular phase. Menstrual cycle had no remarkable effects in group T. Physical training improved heat loss responses, which was more marked in the midluteal than in the midfollicular phase. thermoregulation; estradiol; progesterone; long-term endurance training; heat acclimatization HEAT LOSS RESPONSES, SUCH as sweating and cutaneous vasodilation, during exercise in women differ from those in men because female hormones modify the responses after puberty (3). All studies of the effects of the menstrual cycle on heat loss responses during exercise have demonstrated that the core body temperature thresholds for sweating and cutaneous vasodilation are higher during the luteal phase of the menstrual cycle than during the follicular phase (14,15,17,18,23,31,33,35). In addition, the rise in the core body temperature threshold for sweating and cutaneous vasodilation during the luteal phase is mainly due to elevated progesterone concentrations (8, 31).Conversely, there are conflictin...

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“…Although some controversy persists, sweat regulation during exercise seems to be gender specific (4,5). In women, the effect of the menstrual cycle on sweating rate has been evaluated in the past with inconclusive findings, with the rate being either unchanged (7,10) or lower in the luteal phase (11).…”

Section: Discussionmentioning

confidence: 99%

“…Many studies were conducted in the 1970's and 1980's to investigate possible gender differences in thermoregulation, but they seldom took into account the menstrual cycle and its associated changes of core temperature (3)(4)(5). Evidence about the possible effect of the menstrual cycle on thermoregulation during exercise is scarce and contradictory (6)(7)(8)(9)(10)(11), although the importance of controlling for the menstrual cycle in thermoregulation studies involving fertile women has been repeatedly emphasized (12)(13)(14).…”

Section: Introductionmentioning

confidence: 99%

Luteal phase of the menstrual cycle increases sweating rate during exercise

Terrazas

Lacerda

Fonseca

et al. 2006

Braz J Med Biol Res

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The present study evaluated whether the luteal phase elevation of body temperature would be offset during exercise by increased sweating, when women are normally hydrated. Eleven women performed 60 min of cycling exercise at 60% of their maximal work load at 32ºC and 80% relative air humidity. Each subject participated in two identical experimental sessions: one during the follicular phase (between days 5 and 8) and the other during the luteal phase (between days 22 and 25). Women with serum progesterone >3 ng/mL, in the luteal phase were classified as group 1 (N = 4), whereas the others were classified as group 2 (N = 7). Post-exercise urine volume (213 ± 80 vs 309 ± 113 mL) and specific urine gravity (1.008 ± 0.003 vs 1.006 ± 0.002) changed (P < 0.05) during the luteal phase compared to the follicular phase in group 1. No menstrual cycle dependence was observed for these parameters in group 2. Sweat rate was higher (P < 0.05) in the luteal (3.10 ± 0.81 g m -2 min -1 ) than in the follicular phase (2.80 ± 0.64 g m -2 min -1 ) only in group 1. During exercise, no differences related to menstrual cycle phases were seen in rectal temperature, heart rate, rate of perceived exertion, mean skin temperature, and pre-and post-exercise body weight. Women exercising in a warm and humid environment with water intake seem to be able to adapt to the luteal phase increase of basal body temperature through reduced urinary volume and increased sweating rate.

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

Cited by 140 publications

References 9 publications

Sauna-induced body mass loss in physically inactive young women and men

Sauna-induced body mass loss in physically inactive young women and men

Effects of menstrual cycle and physical training on heat loss responses during dynamic exercise at moderate intensity in a temperate environment

Luteal phase of the menstrual cycle increases sweating rate during exercise

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