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Caffeine Effects on Physical and Cognitive Performance During Sustained Operations

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McLellan TM, Kamimori GH, Voss DM, Tate C, Smith SJR. Caffeine effects on physical and cognitive performance during sustained operations. Aviat Space Environ Med 2007; 78:871–877.



Purpose: This study examined caffeine (CAF) effects on physical performance and vigilance during 4 d and 3 nights of sustained operations in Special Forces personnel. Methods: There were 20 soldiers (28.6 ± 4.7 yr, 177.6 ± 7.5 cm, 81.2 ± 8.0 kg) who were divided equally into placebo (PLAC) and CAF groups. A 4-km run that included three obstacles (OBST) was completed each morning with the performance on Day 2 representing control (CON) after familiarization on Day 1 and an 8-h sleep. From 01:30 to 06:15 of Days 3–5, soldiers performed two 2-h vigilance (VIG) sessions in the field. PLAC or 200 mg of CAF was administered at 21:45 of Days 2–4 and at 01:00, 03:45, and approximately 07:00 on Days 3–5. The run commenced within 30 min of the final dose. Soldiers were provided a 4-h sleep period from 13:30–17:30 during Days 3 and 4. Results: VIG during Days 3–5 was greater for CAF vs. PLAC and not different from CON. Total run time was faster for CAF (29.7 ± 2.0 min) compared with PLAC (30.7 ± 2.9 min) on Day 3 due to faster completion of OBST (8.7 ± 0.7 min vs. 9.2 ± 1.0 min for CAF and PLAC, respectively). Thereafter, run times decreased for both groups on Days 4 and 5 compared with CON due primarily to an increased pace between OBST. Conclusions: It was concluded that CAF maintained both vigilance and physical performance during sustained operations that require periods of overnight wakefulness and restricted opportunities for daytime sleep.
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Keywords: continuous night time operations; ergogenic and cognitive aids; obstacle course; restricted sleep

Document Type: Research Article

Publication date: September 1, 2007

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