Performance effects of alcohol intoxication and hangover at ground level and at simulated altitude

Collins, William E. · 1979 · OpenAlex-citations

DOI: 10.1037/e437952008-001

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Summary

This study investigated the performance effects of acute alcohol intoxication and subsequent hangover on aviation tasks, specifically examining whether simulated altitude exacerbates these impairments. The research was motivated by conflicting prior evidence regarding whether alcohol and hypoxia interact synergistically to degrade pilot performance, and whether hangover symptoms persist as measurable deficits eight hours after drinking, potentially challenging the Federal Aviation Administration’s "8-hour rule." Eight active general aviation pilots (four men, four women) participated in a controlled laboratory experiment involving three conditions: alcohol ingestion, placebo, and sleep control. Subjects consumed 3.25 ml of 100-proof alcohol per kg of body weight over three hours, achieving a mean peak breath alcohol level of 91 mg percent. Performance was assessed using a two-dimensional tracking task (simulating localizer/glide slope control) and a visual reaction time task. Testing occurred under static and dynamic (angular acceleration) conditions at both ground level and a simulated altitude of 12,000 feet. Measurements were taken before drinking, immediately after drinking (midnight), and the following morning after 4–5 hours of sleep. Subjects also completed questionnaires assessing drunkenness, hangover symptoms, mood, and anxiety. Results indicated significant performance impairment during acute intoxication. At midnight, alcohol consumption significantly degraded both tracking accuracy and visual reaction times compared to pre-drinking and placebo conditions, regardless of altitude or motion status. However, no significant performance deficits were observed during the morning hangover sessions; tracking and reaction time scores returned to baseline levels comparable to the placebo and control conditions. While subjects reported subjective hangover symptoms and elevated fatigue ratings in the morning, these did not translate into measurable performance decrements. Furthermore, there were no significant interactions between alcohol and altitude; the simulated altitude of 12,000 feet did not amplify the effects of either acute intoxication or hangover on performance metrics. The findings provide empirical support for the FAA’s "8-hour rule," demonstrating that while acute alcohol intoxication severely impairs pilot performance, hangover symptoms eight hours later do not result in significant objective performance deficits under the tested conditions. The study also refutes the hypothesis that moderate altitude synergistically worsens alcohol-induced impairment. These results suggest that the primary risk to aviation safety lies in acute intoxication rather than the hangover state, provided sufficient time has elapsed for alcohol metabolism.

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