United States Department of Transportation
i
Physiological, biochemical, and performance responses to a 24-hour crash diet.
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1981-04-01
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[PDF-1.75 MB]
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Edition:OAM report.
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Abstract:Twelve overweight male subjects were evaluated once on a normal diet and once on a 24-h crash diet and (low calorie liquids only). Experiments were 1 wk apart. During 2 1/4-h complex performance tests given at the end of the diet period, subjects breathed an O2/N2 gas mixture equivalent to 12,500 ft.
There were no significant physiological and biochemical findings due to diet for heart rate, blood pressure, serum electrolytes, subjective fatigue and urinary excretion of K+, epinephrine and norepinephrine. Body temperatures were lower (p .05) for the crash diet than for the normal diet. Serum glucose levels were normal but increased during the normal diet and decreased during the crash diet. Hematocrit increased from pretest to posttest under both conditions but was greater for the crash diet (p .05) than for the normal diet. Urinary excretion of 17-ketogenic sterioids was less (p .001) for the sleep period for the crash diet than for the normal diet. Urinary excretion rate of Na+ was less (p .001) for the crash diet than for the normal diet.
Complex performance showed no significant differences when subjects were tested under low workloads. Several measurements showed enhancement of performance during the crash diet when subjects were being tested under the medium and high workload conditions.
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