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Related Experiment Videos

Effects of caffeine on alertness.

A Zwyghuizen-Doorenbos1, T A Roehrs, L Lipschutz

  • 1Sleep Disorders and Research Center, Henry Ford Hospital, Detroit, MI 48202.

Psychopharmacology
|January 1, 1990
PubMed
Summary

Caffeine significantly improves alertness and performance on tasks like auditory vigilance. However, tolerance to its sleep-latency effects develops with repeated use, though conditioning effects may enhance alertness.

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How representative are insomnia clinical trials?

Sleep medicine·2018

Area of Science:

  • Pharmacology
  • Neuroscience
  • Sleep Medicine

Background:

  • Caffeine is a widely consumed stimulant known for its alerting effects.
  • Objective measures are needed to quantify caffeine's impact on alertness and performance.
  • Understanding tolerance and conditioning is crucial for optimizing caffeine use.

Purpose of the Study:

  • To assess the alerting effects of caffeine using the Multiple Sleep Latency Test (MSLT).
  • To investigate the development of tolerance to caffeine's effects on sleep latency.
  • To examine conditioning effects to caffeine's alerting properties.

Main Methods:

  • 24 healthy young men received either 250 mg caffeine or placebo double-blind over two days.
  • Sleep latency (MSLT) and performance (divided attention, auditory vigilance) were measured daily.
  • A placebo test on day 3 assessed conditioning effects.

Main Results:

  • Caffeine significantly increased sleep latency, indicating improved alertness.
  • Auditory vigilance performance was enhanced by caffeine compared to placebo.
  • Tolerance to caffeine's effects on sleep latency was observed.
  • Participants showed enhanced alertness and performance on day 3 if previously given caffeine (conditioning).

Conclusions:

  • Caffeine effectively enhances alertness and specific cognitive functions.
  • Tolerance to caffeine's sleep-latency effects can develop with repeated administration.
  • Conditioning to caffeine's alerting effects may occur, influencing subsequent performance.

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