Coffee and caffeine and alcohol effects on psychomotor function

Area of Science:

• Pharmacology
• Neuroscience
• Human Physiology

Background:

• Alcohol consumption is widespread, and its interaction with caffeine, a common stimulant, is of significant public health interest.
• Previous research has yielded conflicting results regarding caffeine's ability to mitigate alcohol's effects.
• Understanding these interactions is crucial for public safety and informed consumption choices.

Purpose of the Study:

• To investigate the effects of caffeine on alcohol-induced psychomotor impairment and subjective intoxication in healthy men.
• To determine if caffeine consumption can alter the physiological or subjective effects of alcohol.
• To examine the pharmacokinetic interaction between alcohol and caffeine, specifically alcohol's effect on serum caffeine concentrations.

Main Methods:

• Two double-blind, crossover trials were conducted involving healthy male subjects.
• Participants received varying doses of alcohol (0.7-1.5 gm/kg) alone or in combination with caffeine (200-500 mg).
• Psychophysiological functions and subjective effects were measured, alongside serum caffeine concentrations.

Main Results:

• Alcohol significantly impaired psychomotor functions in a dose-dependent manner.
• Neither caffeinated nor decaffeinated coffee modified alcohol's impairing effects on psychomotor performance.
• Subjective assessments revealed no discernible difference between caffeine and placebo, and no specific alcohol-caffeine interaction was detected, although alcohol elevated serum caffeine levels.

Conclusions:

• Coffee does not counteract alcohol-induced inebriation or impairment.
• Caffeine does not mitigate the negative effects of alcohol on psychomotor performance or subjective feelings of intoxication.
• The study highlights that combining alcohol and caffeine does not reduce alcohol's detrimental effects.