The relationship between shift work, circadian rhythms, and cognitive function in ICU nursing

• DOI: 10.1186/s12912-025-02850-2
• Publication Date: 2025-03-26T12:48:46Z
• Authors: Saeideh Moosavi; Mehran Ghalenoei; Mohammad Amerzadeh; Ali Safari Variani

Abstract Background Nurses work 24-hour shifts due to the critical importance of patient care. The human body has a circadian rhythm that regulates many physiological activities. Shift is associated with decreased melatonin levels and disruption rhythm. Given vital role cognitive functions such as working memory attention, this study investigated impact disturbances on performance intensive care unit (ICU) nurses in Qazvin City, Iran. Methods population consisted 36 nurses. assessment tools included demographic questionnaire, function tests (attention memory) using Stroop Test Wechsler Adult Intelligence Scale, administered at beginning end each three shifts. data was analyzed descriptive statistics, including mean, standard deviation, frequency percentages. Kolmogorov-Smirnov test used determine normality data. analysis involved analytical statistics mixed-effects models performed R software version 4. significance level p < 0.05 for present study. Results exhibited high degree inflexibility, 83.3% classified " inflexibile” 91.7% vigorous “.|The nurses’ highest during morning shift, better attention abilities. A one-unit increase stability amplitude reductions span, congruent response time, incongruent time evening night Conclusion observed decline specific shifts, likelihood increased errors these heightened. cumulative effect disruptions can manifest diminished performance. could serve predictive indicators staffing shift systems prevent enhance system’s efficiency.