Vol 8, No 2 (2017) > Industrial Engineering >

The Efficacy of One-time and Intermittent Intake of Coffee as a Countermeasure to Sleepiness on Partially Sleep-deprived Drivers

Manik Mahachandra, Siti Munzayanah, Yassierli Yassierli



Research has been done
the effect of coffee on sleepiness. Several studies claim that caffeine is
proven to overcome sleepiness. However, little is known about the effect of
various methods and amounts of coffee intake on a sleep-deprived person. This
study compares the effectiveness of one-time and intermittent intake of coffee
to overcome driver sleepiness due to partial sleep deprivation. This study used a within-subject experimental
design in a driving simulator. There were eight participants, all of whom met
certain criteria. The participants’ degree of sleepiness was measured
objectively and subjectively. Objectively, the degree of sleepiness was
measured based on alpha, beta, and theta brainwaves using an electroencephalograph
(EEG); subjectively, this study used the Karolinska Sleepiness Scale (KSS). The
participants experienced partial sleep deprivation the night before each
experiment. The results
of this study support previous studies’ findings that coffee can reduce
sleepiness. This study also found differences in the effectiveness of one-time
vs. intermittent intake of coffee (sig. value for EEG = 0.025; sig. value for
KSS = 0.001). For partially sleep-deprived drivers, one-time coffee intake was
found to be more effective in counteracting both objective and subjective
sleepiness than intermittent coffee intake.

Keywords: Coffee; Countermeasure; Driver; Intake; Sleepiness

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