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J Sports Sci. 2018 Feb;36(3):348-355. doi: 10.1080/02640414.2017.1306652. Epub 2017 Mar 24.

Females exposed to 24 h of sleep deprivation do not experience greater physiological strain, but do perceive heat illness symptoms more severely, during exercise-heat stress.

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a Centre for Sport and Exercise Science and Medicine (SESAME), Environmental Extremes Laboratory , University of Brighton , Eastbourne , UK.
b School of Sport, Health and Exercise Sciences (SSHES) , Bangor University , North Wales , UK.
c Centre for Human Performance, Exercise and Rehabilitation (CHPER) , Brunel University London , Uxbridge , UK.


There is limited and inconclusive evidence surrounding the physiological and perceptual responses to heat stress while sleep deprived, especially for females. This study aimed to quantify the effect of 24 h sleep deprivation on physiological strain and perceptual markers of heat-related illness in females. Nine females completed two 30-min heat stress tests (HST) separated by 48 h in 39°C, 41% relative humidity at a metabolic heat production of 10 W · kg-1. The non-sleep deprived HST was followed by the sleep deprivation (SDHST) trial for all participants during the follicular phase of the menstrual cycle. Physiological and perceptual measures were recorded at 5 min intervals during the HSTs. On the cessation of the HSTs, heat illness symptom index (HISI) was completed. HISI scores increased after sleep deprivation by 28 ± 16 versus 20 ± 16 (P = 0.01). Peak (39.40 ± 0.35°C vs. 39.35 ± 0.33°C) and change in rectal temperature (1.91 ± 0.21 vs. 1.93 ± 0.34°C), and whole body sweat rate (1.08 ± 0.31 vs. 1.15 ± 0.36 L · h-1) did not differ (P > 0.05) between tests. No difference was observed in peak, nor rise in: heart rate, mean skin temperature, perceived exertion or thermal sensation during the HSTs. Twenty-four hours sleep deprivation increased perceptual symptoms associated with heat-related illness; however, no thermoregulatory alterations were observed.


Metabolic heat production; females; heat injury; sleep loss; thermoregulation

[Indexed for MEDLINE]

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