Effects of food or sleep deprivation during civilian survival training on clinical chemistry variables.

Objective: To describe clinical chemistry and weight changes after short-term food or sleep deprivation or multiple deprivations during civilian survival training.

Methods: Data from one baseline-controlled two-period crossover study designed to compare sleep deprivation for up to 50 hours with food deprivation for up to 66 hours (n = 12) and data from regular multiple-deprivations survival training comparing participants (n = 33) with nondeprived instructors (n = 10).

Results: Food deprivation was associated with decreased body weight, blood glucose, serum triglycerides, sodium, chloride, and urine pH, and there were increases in blood and urine ketones and serum free fatty acids.

Effects of sleep or food deprivation during civilian survival training on cognition, blood glucose and 3-OH-butyrate.

Objectives: The study was designed to compare effects of food deprivation (FD) and sleep deprivation (SD) on cognition during survival training.

Methods: In a cross-over design (n=12), the effects of FD (up to 66 hours followed by 500 kcal intake over 24 hours) and SD (up to 50 hours) on cognitive variables, blood glucose, and 3-OH-butyrate were studied.

Results: Food deprivation and SD impaired attention-dependent tasks.