Caffeine restores engagement speed but not shooting precision following 22 h of active wakefulness.

摘要: BACKGROUND: Current military missions occasionally require combat readiness of soldiers who might be experiencing a sustained period activity without sleep. Strategies to overcome the debilitating effects sleep deprivation include ingestion caffeine. Unknown is efficacy caffeine use on specific elements target detection and marksmanship following modest wakefulness. METHODS: There were 20 subjects (mean +/- SD 26.7 7.2 yr age, 179 6 cm in height, 84.5 10.8 kg weight) participated double-blind placebo trials where each trial involved 24-h control (with sleep) followed by 22 h mixed mental physical with no At end this period, engaged 1-h rifle-shooting task. Subjects ingested 400, 100, 100 mg or at 7.5, 3, 0 h, respectively, prior shooting. Measures shooting performance included engagement time (between appearance firing), friend-foe discrimination, accuracy, precision. RESULTS: Most measures degraded sleep-deprived condition, but only number shots fired restored ingestion. CONCLUSIONS: These findings concur other research involving different periods deprivation, indicate that cognitive component task (i.e., detection) can benefit from whereas psychomotor (marksmanship) does not. It appears once detected, subject sufficiently aroused engage regardless subject's level alertness detection. Language: en