title: Fifty-three hours of total sleep deprivation has no effect on rewarming from cold air exposure.
abstract: OBJECTIVE
  Sleep deprivation and cold air exposure are both experienced in occupational and military settings but the combined effects of these 2 stressors is unknown. The purpose of this study was to determine the effects of 53 hours of total sleep deprivation on thermoregulation during the rewarming phase (25°C air) after acute cold air exposure (10°C air).
  
  
  METHODS
  Eight young men underwent 2 trials in which they either received 7 hours of sleep at night or were totally sleep deprived. On 3 consecutive mornings, the subjects underwent 2 hours of cold air exposure followed by 2 hours of rewarming. Rectal temperature, mean skin temperature, oxygen consumption, and thermal sensation were measured.
  
  
  RESULTS
  Rewarming from acute cold air exposure caused a decline in rectal temperature (~0.5°C) each day but this was not different between subjects who were totally sleep deprived and subjects who received 7 hours of sleep at night. During this same period, mean skin temperature increased (from ~22°C to 27°C), oxygen consumption decreased (from ~7 to 4 mL·kg(-1)·min(-1)), and the participants felt warmer.
  
  
  CONCLUSIONS
  Under the conditions of the present study, sleep-deprived persons are not at a greater risk for a decline in rectal temperature (ie, a hypothermic afterdrop) during rewarming from cold air.
authors: Exercise and Environmental Physiology Laboratory, Kent State University, Kent, OH 44242, USA.
authors: Tiffany A
authors: TA
authors: Esmat
authors: Katherine E
authors: KE
authors: Clark
authors: Matthew D
authors: MD
authors: Muller
authors: Judith A
authors: JA
authors: Juvancic-Heltzel
authors: Ellen L
authors: EL
authors: Glickman
mesh_terms: D001833:Body Temperature Regulation / Q000502:physiology*; D003080:Cold Temperature / Q000009:adverse effects; D018592:Cross-Over Studies; D004781:Environmental Exposure / Q000009:adverse effects*; D006801:Humans; D007035:Hypothermia / Q000503:physiopathology; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D012007:Rectum / Q000502:physiology; D012881:Skin Temperature / Q000502:physiology; D012892:Sleep Deprivation / Q000503:physiopathology*; D055815:Young Adult