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Caffeine improves reaction time, vigilance and logical reasoning during extended periods with restricted opportunities for sleep

RATIONALE: Various occupational groups are required to maintain optimal physical and cognitive function during overnight periods of wakefulness, often with less than optimal sleep. Strategies are required to help mitigate the impairments in cognitive function to help sustain workplace safety and pro...

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Autores principales: Kamimori, Gary H., McLellan, Tom M., Tate, Charmaine M., Voss, David M., Niro, Phil, Lieberman, Harris R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4432086/
https://www.ncbi.nlm.nih.gov/pubmed/25527035
http://dx.doi.org/10.1007/s00213-014-3834-5
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author Kamimori, Gary H.
McLellan, Tom M.
Tate, Charmaine M.
Voss, David M.
Niro, Phil
Lieberman, Harris R.
author_facet Kamimori, Gary H.
McLellan, Tom M.
Tate, Charmaine M.
Voss, David M.
Niro, Phil
Lieberman, Harris R.
author_sort Kamimori, Gary H.
collection PubMed
description RATIONALE: Various occupational groups are required to maintain optimal physical and cognitive function during overnight periods of wakefulness, often with less than optimal sleep. Strategies are required to help mitigate the impairments in cognitive function to help sustain workplace safety and productivity. OBJECTIVES: To test the effectiveness of repeated 200 mg doses of caffeine on cognitive function and live-fire marksmanship with soldiers during three successive nights of sustained wakefulness followed by 4-h afternoon sleep periods. METHODS: Twenty Special Forces personnel (28.6 ± 4.7 years, 177.6 ± 7.5 cm and 81.2 ± 8.0 kg) were randomly assigned to receive four 200-mg doses of caffeine (n = 10) or placebo (n = 10) during the late evening and early morning hours during three successive days. An afternoon 4-h sleep period followed. The psychomotor (PVT) and field (FVT) vigilance, logical reasoning (LRT) tests and a vigilance monitor assessed cognitive function throughout the study. Live-fire marksmanship requiring friend–foe discrimination was assessed. RESULTS: Caffeine maintained speed on the PVT (p < 0.02), improved detection of events during FVT (p < 0.001), increased number of correct responses to stimuli as assessed by the vigilance monitor (p < 0.001) and increased response speed during the LRT (p < 0.001) throughout the three overnight testing periods. Live-fire marksmanship was not altered by caffeine. CONCLUSIONS: A total daily dose of 800 mg caffeine during successive overnight periods of wakefulness is an effective strategy to maintain cognitive function when optimal sleep periods during the day are not available.
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spelling pubmed-44320862015-05-19 Caffeine improves reaction time, vigilance and logical reasoning during extended periods with restricted opportunities for sleep Kamimori, Gary H. McLellan, Tom M. Tate, Charmaine M. Voss, David M. Niro, Phil Lieberman, Harris R. Psychopharmacology (Berl) Original Investigation RATIONALE: Various occupational groups are required to maintain optimal physical and cognitive function during overnight periods of wakefulness, often with less than optimal sleep. Strategies are required to help mitigate the impairments in cognitive function to help sustain workplace safety and productivity. OBJECTIVES: To test the effectiveness of repeated 200 mg doses of caffeine on cognitive function and live-fire marksmanship with soldiers during three successive nights of sustained wakefulness followed by 4-h afternoon sleep periods. METHODS: Twenty Special Forces personnel (28.6 ± 4.7 years, 177.6 ± 7.5 cm and 81.2 ± 8.0 kg) were randomly assigned to receive four 200-mg doses of caffeine (n = 10) or placebo (n = 10) during the late evening and early morning hours during three successive days. An afternoon 4-h sleep period followed. The psychomotor (PVT) and field (FVT) vigilance, logical reasoning (LRT) tests and a vigilance monitor assessed cognitive function throughout the study. Live-fire marksmanship requiring friend–foe discrimination was assessed. RESULTS: Caffeine maintained speed on the PVT (p < 0.02), improved detection of events during FVT (p < 0.001), increased number of correct responses to stimuli as assessed by the vigilance monitor (p < 0.001) and increased response speed during the LRT (p < 0.001) throughout the three overnight testing periods. Live-fire marksmanship was not altered by caffeine. CONCLUSIONS: A total daily dose of 800 mg caffeine during successive overnight periods of wakefulness is an effective strategy to maintain cognitive function when optimal sleep periods during the day are not available. Springer Berlin Heidelberg 2014-12-21 2015 /pmc/articles/PMC4432086/ /pubmed/25527035 http://dx.doi.org/10.1007/s00213-014-3834-5 Text en © The Author(s) 2014 https://creativecommons.org/licenses/by/4.0/ Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
spellingShingle Original Investigation
Kamimori, Gary H.
McLellan, Tom M.
Tate, Charmaine M.
Voss, David M.
Niro, Phil
Lieberman, Harris R.
Caffeine improves reaction time, vigilance and logical reasoning during extended periods with restricted opportunities for sleep
title Caffeine improves reaction time, vigilance and logical reasoning during extended periods with restricted opportunities for sleep
title_full Caffeine improves reaction time, vigilance and logical reasoning during extended periods with restricted opportunities for sleep
title_fullStr Caffeine improves reaction time, vigilance and logical reasoning during extended periods with restricted opportunities for sleep
title_full_unstemmed Caffeine improves reaction time, vigilance and logical reasoning during extended periods with restricted opportunities for sleep
title_short Caffeine improves reaction time, vigilance and logical reasoning during extended periods with restricted opportunities for sleep
title_sort caffeine improves reaction time, vigilance and logical reasoning during extended periods with restricted opportunities for sleep
topic Original Investigation
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4432086/
https://www.ncbi.nlm.nih.gov/pubmed/25527035
http://dx.doi.org/10.1007/s00213-014-3834-5
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