Two nights of sleep deprivation with or without energy restriction does not impair the thermal response to cold

Abstract

PurposeIn persons completing exhaustive daily exercise, sleep and energy restriction have been highlighted as risk factors for hypothermia in cold environments. The present study therefore sought to determine the effect of sleep deprivation (SDEP), with and without energy restriction, on the thermal response to cold. MethodsIn a random order, ten recreationally active men (means ± SD: age 25 ± 6 y, body fat 17 ± 5%) completed CAT Tre (P = 0.78). In contrast, perceived thermal discomfort during the initial hour of the CAT tended to be greater after SDEP and SDEP+ER (P ≤ 0.1). ConclusionSleep and energy restriction, at least as evaluated within this experiment, should be considered minimal risk factors for hypothermia. The greater perception of cold discomfort at the same body temperature suggests that sleep and energy restriction may actually reduce cold injury risk, as people are likely to engage earlier in normal behavioural cold adaptation.

Adult skin acute stress responses to short‐term environmental and internal aggression from exposome factors

“…Acute sleep deprivation induced changes in thermoregulation in rats resulting in a decreased peripherical surface temperature due to SA activation during acute stress 115 . However, two nights of sleep deprivation with or without energy restriction did not impair the thermal response to cold in human subjects 116,117 …”

“… 115 However, two nights of sleep deprivation with or without energy restriction did not impair the thermal response to cold in human subjects. 116 , 117 …”

Short‐term sleep deprivation and human thermoregulatory function during thermal challenges

“…Considering the recurrently described influence of sleep deficit on cognition (Killgore, 2010), it might be assumed that the thermoperceptual responsiveness to thermal stimuli would also be affected; however, the results on whole-body thermoperception after a period of sleep loss appear to be inconsistent (Tables 1 and 2). Thus, 53 h of TSD exacerbated thermal discomfort during the initial 1 h of a 4 h exposure to 0 • C air; a response that was independent of any TSD-driven variation in the whole-body thermal state of subjects (Oliver et al, 2015). Such a thermoperceptual sensitization, however, is not supported by other cold-relevant studies (Costa et al, 2010;Esmat et al, 2012;Landis et al, 1998).…”

“…Contrary to the aforementioned two studies, the others have failed to detect any adverse effects of TSD on thermoregulation to cold, during both resting conditions (Caine-Bish et al, 2004;Costa et al, 2010;Fiorica et al, 1968;Oliver et al, 2015) and moderateintensity exercise (Kolka et al, 1984). Of interest is the work of Oliver et al (2015) and Costa et al (2010), who, by using a within-subject design, found that 53 h of TSD combined with or without negative energy balance neither perturbed thermoeffector capacities (Oliver et al, 2015) nor modulated the immune reactions (the suppression of circulating lymphocytes, neutrophil degranulation and saliva secretory immunoglobulin A) evoked by acute cold (0 • C air) stress (Costa et al, 2010). Lastly, the rewarming response after a period of whole-body cooling does not appear to be disturbed by TSD (Esmat et al, 2012;Oliver et al, 2015).…”

“…Of interest is the work of Oliver et al (2015) and Costa et al (2010), who, by using a within-subject design, found that 53 h of TSD combined with or without negative energy balance neither perturbed thermoeffector capacities (Oliver et al, 2015) nor modulated the immune reactions (the suppression of circulating lymphocytes, neutrophil degranulation and saliva secretory immunoglobulin A) evoked by acute cold (0 • C air) stress (Costa et al, 2010). Lastly, the rewarming response after a period of whole-body cooling does not appear to be disturbed by TSD (Esmat et al, 2012;Oliver et al, 2015).…”