(HealthDay News) — Shift and night work is associated with various types of decreased cognitive performance, according to a meta-analysis published online March 8 in Occupational & Environmental Medicine.
Thomas Vlasak, from Sigmund Freud Private University Linz in Austria, and colleagues conducted a systematic literature search and performed a meta-analysis of data from observational studies evaluating the association between shift work exposure and cognitive functions. To summarize the mean differences between the exposure group and controls, the authors executed a random-effects model using Hedges’ g as a meta-analytical effect size with a restricted-likelihood estimator.
Based upon 18 included studies (18,802 participants), the researchers observed significantly worse performance in shift workers versus nonshift workers for the following cognitive functions: processing speed (Hedges’ g, 0.16; 95% confidence interval, 0.02 to 0.30), working memory (Hedges’ g, 0.28; 95% confidence interval, 0.51 to 0.50), psychomotor vigilance (Hedges’ g, 0.21; 95% confidence interval, 0.05 to 0.37), cognitive control (Hedges’ g, 0.86; 95% confidence interval, 0.45 to 1.27), and visual attention (Hedges’ g, 0.19; 95% confidence interval, 0.11 to 0.26).
“Reduced neurobehavioral performance in shift workers might play an important role regarding work-related injuries and errors,” the authors write. “Occupational health policies should focus on promoting protective countermeasures (e.g., naps, cognitive monitoring, recovery plans) to prevent adverse health outcomes for workers and negative consequences for involved third parties.”
