AI Article Synopsis
- - The study investigated the impact of high levels of environmental carbon dioxide (CO) on daytime sleepiness, specifically at 5000 ppm, and found that it significantly increased sleepiness and reduced sleep latency for participants.
- - Eleven healthy male participants underwent a controlled sleep test, revealing that exposure to elevated CO levels led to higher subjective sleepiness ratings compared to control conditions, although cognitive performance remained unchanged.
- - The results suggest that high CO exposure at work could contribute to increased daytime sleepiness, potentially compromising work efficiency and safety, emphasizing the importance of monitoring air quality in work environments.
Article Abstract
Background: Daytime sleepiness affects work efficiency, occupational safety, and public health. Although previous studies have reported an association between environmental carbon dioxide (eCO) and daytime sleepiness, it has been challenging to draw a firm conclusion due to the lack of standardized sampling and profiling protocols.
Objective: We examined the effect of pure CO exposure at 5000 (ppm, parts per million) on daytime sleepiness.
Methods: Eleven healthy participants (males of 24 ± 3 years, mean ± SD) completed a four-nap multiple sleep latency test (MSLT) protocol in the environmentally controlled chamber under two conditions: the CO condition (4851 ± 229 ppm) and the Control condition (1102 ± 204 ppm). The subjective sleepiness level and cognitive performances were also evaluated using the Stanford Sleepiness Scale (SSS) questionnaire, Psychomotor Vigilance Test (PVT), and Stroop test after each nap session.
Results: A significant reduction in sleep latency was observed in the CO exposure condition (Control vs. CO = 13.1 ± 3.3 min vs. 9.7 ± 3.2 min). The subjective sleepiness scores were also significantly higher in the CO exposure condition than in the Control condition (Control vs. CO = 2.7 ± 0.5 vs. 4.7 ± 0.8). Cognitive responses after naps showed no significant difference across conditions.
Conclusion: This study revealed that exposure to environmental CO at a concentration as high as the upper safety limit at work sites significantly shortened the sleep latency and enhanced subjective sleepiness during naps in the MSLT without affecting cognitive responses after each exposure. Our results demonstrated that exposure to high environmental CO induces daytime sleepiness that potentially compromises work efficiency and safety.
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| http://dx.doi.org/10.1016/j.envres.2024.119785 | DOI Listing |
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