Sleep, performance and mood after the energy-expenditure equivalent of 40 hours of sleep deprivation.

Twelve Marine subjects marched approximately 20 miles to expend as much energy in one 16-hr day as is expended during 40 hrs of relatively inactive sleep deprivation. At the end of the march, performance on addition, vigilance, choice reaction time, tapping, short-term memory, symbol substitution, and three mood scales was decremented significantly. Those decrements closely approximated decrements reported in the literature following 40 hrs of sleep deprivation. However, recovery sleep stages and arousal thresholds were essentially unchanged as compared to baseline and were significantly different from those predicted after 40 hrs of sleep loss. It was concluded that while changes in performance were probably linked to total energy consumption, the commonly measured sleep variables were not.

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