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Related Experiment Videos

Performance overnight in shiftworkers operating a day-night schedule.

R G Borland, A S Rogers, A N Nicholson

    Aviation, Space, and Environmental Medicine
    |March 1, 1986
    PubMed
    Summary
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    Caffeine intake can improve performance during overnight work shifts, mitigating reduced vigilance and task impairment. This study investigated the effects of caffeine on performance and physiological measures during day and night work schedules.

    Area of Science:

    • Human Physiology
    • Sleep Science
    • Occupational Health

    Background:

    • Work performance can be affected by circadian rhythms and time of day.
    • Overnight work presents unique challenges to cognitive function and vigilance.
    • Caffeine is a widely used stimulant with potential performance-enhancing effects.

    Purpose of the Study:

    • To assess the impact of a day-night work schedule on performance.
    • To investigate the effects of 300 mg caffeine on overnight performance.
    • To examine the relationship between performance, circadian rhythmicity, and caffeine use.

    Main Methods:

    • Performance tests were conducted during daytime (0800-1700) and overnight (1700-0800) work periods.
    • Sleep electroencephalogram, oral temperature, and urinary electrolyte excretion were monitored.

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  • The effects of 300 mg caffeine were evaluated during overnight work shifts.

    • Main Results:

    • Daytime performance impairment was minimal, affecting only continuous performance tests.
    • Overnight performance impairment was more significant, notably including reduced vigilance.
    • Impaired overnight performance correlated with time on task and circadian rhythmicity.
    • Caffeine administration partially alleviated overnight performance deficits.

    Conclusions:

    • Overnight work significantly impairs performance, particularly vigilance, compared to daytime work.
    • Circadian factors and prolonged work duration contribute to performance decrements during night shifts.
    • Caffeine (300 mg) offers a partial countermeasure to the negative effects of overnight work on performance.