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Early morning driver sleepiness: effectiveness of 200 mg caffeine.
Psychophysiology 2000; 37(2):251-6P

Abstract

Sleep-related vehicle accidents are prevalent early morning, especially in younger drivers. In two independent studies following a night of either restricted or nil sleep, young experienced drivers drove for 2 hr (0600-0800 h) continuously in an immobile car on an interactive, computer-generated, dull, and monotonous roadway. This exercise followed ingestion (at 0530 h) of 200 mg caffeine (= 2-3 cups coffee) versus placebo, counterbalanced, double blind. Driving incidents (lane drifting), subjective sleepiness, and 4-11 Hz electroencephalogram (EEG) activity were logged. In Study 1 (sleeping 0000-0500 h), caffeine significantly reduced incidents and subjective sleepiness throughout the 2-hr drive, and EEG power for the second 30-min period. In Study 2 (no sleep), sleepiness affected all measures profoundly, and driving was terminated after 1 hr. Nevertheless, caffeine reduced incidents significantly for the first 30 min and subjective sleepiness for the hour. This caffeine dose, feasibly taken via coffee, effectively reduces early morning driver sleepiness for about 30 min following nil sleep, and for around 2 hr after sleep restriction.

Authors+Show Affiliations

Department of Human Sciences, Loughborough University, Leicestershire, UK. l.a.reyner@lboro.ac.ukNo affiliation info available

Pub Type(s)

Clinical Trial
Controlled Clinical Trial
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

10731775

Citation

Reyner, L A., and J A. Horne. "Early Morning Driver Sleepiness: Effectiveness of 200 Mg Caffeine." Psychophysiology, vol. 37, no. 2, 2000, pp. 251-6.
Reyner LA, Horne JA. Early morning driver sleepiness: effectiveness of 200 mg caffeine. Psychophysiology. 2000;37(2):251-6.
Reyner, L. A., & Horne, J. A. (2000). Early morning driver sleepiness: effectiveness of 200 mg caffeine. Psychophysiology, 37(2), pp. 251-6.
Reyner LA, Horne JA. Early Morning Driver Sleepiness: Effectiveness of 200 Mg Caffeine. Psychophysiology. 2000;37(2):251-6. PubMed PMID: 10731775.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Early morning driver sleepiness: effectiveness of 200 mg caffeine. AU - Reyner,L A, AU - Horne,J A, PY - 2000/3/25/pubmed PY - 2000/4/29/medline PY - 2000/3/25/entrez SP - 251 EP - 6 JF - Psychophysiology JO - Psychophysiology VL - 37 IS - 2 N2 - Sleep-related vehicle accidents are prevalent early morning, especially in younger drivers. In two independent studies following a night of either restricted or nil sleep, young experienced drivers drove for 2 hr (0600-0800 h) continuously in an immobile car on an interactive, computer-generated, dull, and monotonous roadway. This exercise followed ingestion (at 0530 h) of 200 mg caffeine (= 2-3 cups coffee) versus placebo, counterbalanced, double blind. Driving incidents (lane drifting), subjective sleepiness, and 4-11 Hz electroencephalogram (EEG) activity were logged. In Study 1 (sleeping 0000-0500 h), caffeine significantly reduced incidents and subjective sleepiness throughout the 2-hr drive, and EEG power for the second 30-min period. In Study 2 (no sleep), sleepiness affected all measures profoundly, and driving was terminated after 1 hr. Nevertheless, caffeine reduced incidents significantly for the first 30 min and subjective sleepiness for the hour. This caffeine dose, feasibly taken via coffee, effectively reduces early morning driver sleepiness for about 30 min following nil sleep, and for around 2 hr after sleep restriction. SN - 0048-5772 UR - https://www.unboundmedicine.com/medline/citation/10731775/Early_morning_driver_sleepiness:_effectiveness_of_200_mg_caffeine_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0048-5772&date=2000&volume=37&issue=2&spage=251 DB - PRIME DP - Unbound Medicine ER -