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Sleep and Breathing

Erschienen in:

11.01.2022 | Sleep Breathing Physiology and Disorders • Original Article

Time of day, time of sleep, and time on task effects on sleepiness and cognitive performance of bus drivers

verfasst von: Maryam Maghsoudipour, Ramin Moradi, Sara Moghimi, Sonia Ancoli-Israel, Pamela N. DeYoung, Atul Malhotra

Erschienen in: Sleep and Breathing | Ausgabe 4/2022

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Abstract

Purpose

Optimal cognitive performance might prevent vehicle accidents. Identifying time-related circadian and homeostatic parameters having an impact on cognitive performance of drivers may be crucial to optimize drivers’ performance.

Methods

In this prospective study conducted on bus drivers, two drivers alternated driving during a 24-h round trip and were accompanied by an interviewer. Each driver was tested using Karolinska Sleepiness Scale (KSS) and the reversed digit span Wechsler Working Memory test before the start of his shift and then every 6 h during a “work/driving” day. Psychomotor Vigilance Task (PVT) was assessed before and after the journey. Linear mixed model was used to explore the factors affecting cognitive performance and sleepiness in univariate and multivariate analysis.

Results

Among 35 bus drivers, the effect of time of day on working memories was statistically significant (p = 0.001), with the lowest working memory scores at 04:00 am (± 1). The highest score of subjective sleepiness was also at 04:00 am (± 1). The time on task parameter affected sleepiness significantly (p = 0.024) and sleepiness was significantly associated with decreased working memory. Psychomotor Vigilance Task reaction time mean and the number of minor lapses were significantly increased after the journey, which suggested decreased vigilance. In multivariable analysis, a longer interval between the beginning of working hours and testing time (B (95% CI) = 15.25 (0.49 to 30), p = 0.043) was associated with higher (i.e., slower) PVT reaction time mean.

Conclusions

These results suggest that optimizing bus drivers’ working schedules may improve drivers’ sleepiness and cognitive performance and thus increase road safety.

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Titel: Time of day, time of sleep, and time on task effects on sleepiness and cognitive performance of bus drivers
verfasst von: Maryam Maghsoudipour
Ramin Moradi
Sara Moghimi
Sonia Ancoli-Israel
Pamela N. DeYoung
Atul Malhotra
Publikationsdatum: 11.01.2022
Verlag: Springer International Publishing
Erschienen in: Sleep and Breathing / Ausgabe 4/2022
Print ISSN: 1520-9512
Elektronische ISSN: 1522-1709
DOI: https://doi.org/10.1007/s11325-021-02526-6

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Time of day, time of sleep, and time on task effects on sleepiness and cognitive performance of bus drivers