Increasing Humidity Affects Thermoregulation During Low-Intensity Exercise in Women

Moyen, NE; Mündel, Toby; Bois, Du; Ab, Ciccone; Rh, Morton; Judelson, DA

doi:10.3357/asem.3993.2014

Cited by 14 publications

(7 citation statements)

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“…This was later confirmed in female subjects (Moyen et al, 2014b). The results of Moyen et al on exercising male (Moyen et al, 2014a) and female (Moyen et al, 2014b) subjects confirmed the earlier findings in resting human subjects of Bebner et al (1958), who concluded that below a critical ambient humidity, when the skin is not completely wet, the rate of evaporative heat loss depends predominantly on the rate of sweating resulting from the metabolic rate and ambient heat load. Bebner et al (1958) determined this critical relative humidity to be 60% at 40°C (p H2O = 33.2 mmHg), and 83% at 36°C (p H2O = 37.0 mmHg).…”

Section: Introductionmentioning

confidence: 68%

The Effect of Low Ambient Relative Humidity on Physical Performance and Perceptual Responses during Load Carriage

et al. 2017

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Introduction:The study evaluated the effect of low ambient relative humidity on physical performance and perceptual responses during load carriage in a hot environment.Methods: Ten heat-unacclimatized male subjects participated in three 130-min trials, during which they walked on a treadmill, carrying a load of ∼35 kg, at a speed of 3.2 km.h −1 , with an incident wind at the same velocity and ambient temperature at 45 • C. Each trial commenced with a 10-min baseline at 20 • C and 50% relative humidity (RH), the subjects transferred to a climatic chamber and commenced their simulated hike, comprising two 50-min walks separated by a 20-min rest period. In two, full protective equipment (FP) trials, RH was 10% (partial pressure of water vapor, p H2O = 7.2 mmHg) in one (FP10), and 20% (p H2O = 14.4 mmHg; FP20) in the other. In the control trial, subjects were semi-nude (SN) and carried the equipment in their backpacks; RH was 20%. Measurements included oxygen uptake, ventilation, heart rate, rectal and skin temperatures, heat flux, temperature perception, and thermal comfort.Results: In FP20, four subjects terminated the trial prematurely due to signs of heat exhaustion; there were no such signs in FP10 or SN. Upon completion of the trials, pulmonary ventilation, heart rate, and rectal temperature were lower in FP10 (33 ± 5 l/min; 128 ± 21 bpm; 38.2 ± 0.4 • C) and SN (34 ± 4 l/min; 113 ± 18 bpm; 38.1 ± 0.4 • C than in FP20 (39 ± 8 l/min; 145 ± 12 bpm; 38.6 ± 0.4 • C). Evaporation was significantly greater in the SN compared to FP10 and FP20 trials. FP10 was rated thermally more comfortable than FP20. Conclusion:A lower ambient partial pressure of water vapor, reflected in a lower ambient relative humidity, improved cardiorespiratory, thermoregulatory, and perceptual responses during load carriage.

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Section: Introductionmentioning

confidence: 68%

The Effect of Low Ambient Relative Humidity on Physical Performance and Perceptual Responses during Load Carriage

et al. 2017

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“…Experimental studies have found that lower humidity improve cardiorespiratory, thermoregulatory, and perceptual responses during cargo transport [39][40][41]. Additionally, maximum evaporative capacity and heat loss ability gradually decrease as relative humidity increases [40,41]. All these results demonstrate that the estimates of temperature and humidity increase for the coming years due to climate change may negatively affect physical activity practice, particularly in tropical climate countries [37].…”

Section: Discussionmentioning

confidence: 91%

“…In our study, encouraging climate conditions-temperatures from 21 to 31 • C, relative humidity from 65% to 85%, more hours of sun/year, as well as moderate rainfall-were all associated with a higher prevalence of regular physical activity practice, particularly in men. Experimental studies have found that lower humidity improve cardiorespiratory, thermoregulatory, and perceptual responses during cargo transport [39][40][41]. Additionally, maximum evaporative capacity and heat loss ability gradually decrease as relative humidity increases [40,41].…”

Section: Discussionmentioning

confidence: 99%

Social-Ecological Correlates of Regular Leisure-Time Physical Activity Practice among Adults

Cavazzotto

Ronque

Vieira

et al. 2020

IJERPH

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This study calculated the exposure-response rates of social-ecological correlates of practicing regular (>150 min/week) leisure-time physical activity (PA) in 393,648 adults from the 27 Brazilian state capitals who participated in a national survey between 2006 and 2016. Regular PA encouraging factors were inputted into an exposure-response model. Growth rates for the odds ratio and prevalence of regular PA were calculated for each increase of one encouraging factor. Regular PA was reported by 22% of the participants (25% of men and 20% of women). More than 40% of men and 30% of women with higher intra-personal encouraging conditions reported practicing regular PA. There was a 3% (ages 18–32 years) to 5% (ages 46–60 years) increase in regular PA practice in men for each increase in an encouraging climate factor (temperature from 21 °C to 31 °C, humidity from 65% to 85%, 2430 to 3250 h of sun/year, and from 1560 to 1910 mm of rain/year). Encouraging intra-personal factors and favorable climate conditions had larger effects on regular PA practice than the built environment and socio-political conditions; the latter two had independent effects, but did not have a cumulative effect on PA.

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“…MER garments accumulate sweat within the fabric, and in combination with long lasting cutaneous vasodilation after exercise in women, MER rather than PES garments were associated with greater cooling rate and shivering sensations during recovery. According to Moyen et al (2014) , increases in RH also increase sweating rates, so we hypothesize that the MER garments, which cover the body with absorbed sweat, induced an effect similar to a humid environment. Because of that, the relative sweating rates were higher when wearing MER garment sets during exercise compared with the PES sets.…”

Section: Discussionmentioning

confidence: 93%

Physiological and Psychological Responses during Exercise and Recovery in a Cold Environment Is Gender-Related Rather Than Fabric-Related

et al. 2017

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We evaluated gender-specific effects of two types of undergarments on exercise-induced physiological and psychological stress and subsequent recovery in cold conditions for male and female participants. Ten healthy men and eleven healthy women (25.0 ± 1.5 versus 23.4 ± 1.2 years old, respectively) completed the experimental session twice with two different types of undergarments: polyester or merino wool leggings and long-sleeve tops; specifically, merino fabric had greater thermal resistance and water absorbency, and less water vapor as well as air permeability than polyester. Experimental sessions involved performing 1 h of exercise on a cycle ergometer at 8°C ambient temperature and 55% relative humidity, holding at 70–80 revolutions per minute and 60% of each participant’s predetermined maximal power output (assessed by maximal oxygen uptake test), followed by 1 h recovery in the same environment. Every 5 min during exercise and every 10 min during recovery, rectal temperature, heart rate, subjective ratings for thermal, shivering/sweating and clothing wetness sensations, and clothing next-to-skin and outer side surface temperature and humidity on the chest, back and thigh were recorded. All participants experienced high physiological stress (assessed by physiological strain index) during exercise. No significant gender differences were found in core temperature or heart rate changes during exercise, but women cooled down faster during recovery. Next-to-skin humidity was similar between genders and different garment sets during exercise and recovery, but such temperatures at the chest during exercise and at the thigh during exercise and recovery were lower in women with both sets of garments. Subjective thermal sensations were similar in all cases. In the last 20 min of cycling, women started to feel wetter than men (P < 0.05) for both garment sets. Shivering was reported as stronger in women in the last 10 min of recovery. Most of the changes in the garment microclimates during exercise and recovery in the cold were associated with gender-related differences rather than with fabric-related differences.

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Increasing Humidity Affects Thermoregulation During Low-Intensity Exercise in Women

Cited by 14 publications

References 0 publications

The Effect of Low Ambient Relative Humidity on Physical Performance and Perceptual Responses during Load Carriage

The Effect of Low Ambient Relative Humidity on Physical Performance and Perceptual Responses during Load Carriage

Social-Ecological Correlates of Regular Leisure-Time Physical Activity Practice among Adults

Physiological and Psychological Responses during Exercise and Recovery in a Cold Environment Is Gender-Related Rather Than Fabric-Related

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