The Use of Caffeine to Enhance Cognitive Performance, Reaction Time, Vigilance, Rifle Marksmanship and Mood States in Sleep-Deprived Navy SEAL (BUD/S) Trainees.
Technical rept. Jun 95-Oct 97
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
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Caffeine has been shown to improve tasks with a vigilance component. The purpose of this study was to determine the effectiveness of caffeine in sleep-deprived individuals exposed to high levels of operational and environmental stress. Volunteers were 68 Navy SEAL trainees. Volunteers were administered caffeine 100, 200, 300 mg or placebo after 72 hrs of sleep deprivation. Performance testing occurred 1-1.5 hrs and 8-10 hrs after caffeine or placebo administration. Tests included auditory and visual vigilance tests, four-choice reaction time, matching to sample, repeated acquisition, rifle marksmanship, mood and subjective sleepiness assessment. The combined effects of sleep deprivation and the operational and environmental stress of training significantly affected all measures adversely ANOVAs, p0.05 to 0.0001. Caffeine 200 or 300 mg significantly improved p0.05 visual vigilance, reaction time, repeated acquisition, mood and alertness measures compared to placebo when sleep-deprived. Marksmanship was not affected by caffeine.
- Stress Physiology
- Organic Chemistry