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Diurnal variation in variables related to cognitive performance: a systematic review

Munnilari, M, Bommasamudram, T, Easow, J, Tod, D, Varamenti, E, Edwards, BJ, Ravindrakumar, A, Gallagher, C and Pullinger, SA (2023) Diurnal variation in variables related to cognitive performance: a systematic review. Sleep and Breathing. ISSN 1520-9512

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Purpose: The aim of this review was to assess current evidence regarding changes in cognitive function according to time-of-day (TOD) and assess the key components of research design related to manuscripts of chronobiological nature. Methods: An English-language literature search revealed 523 articles through primary database searches, and 1868 via organization searches/citation searching. The inclusion criteria were met by eleven articles which were included in the review. The inclusion criteria set were healthy adult males, a minimum of two timepoints including morning and evening, cognitive measures of performance, and peer-reviewed academic paper. Results: It was established that cognitive performance varies with TOD and the degree of difference is highly dependent on the type of cognitive task with differences ranging from 9.0 to 34.2% for reaction time, 7.3% for alertness, and 7.8 to 40.3% for attention. The type of cognitive function was a determining factor as to whether the performance was better in the morning, evening, or afternoon. Conclusion: Although some studies did not establish TOD differences, reaction time and levels of accuracy were highest in the evening. This implies that cognitive processes are complex, and existing research is contradictory. Some studies or cognitive variables did not show any measurable TOD effects, which may be due to differences in methodology, subjects involved, testing protocols, and confounding factors. No studies met all requirements related to chronobiological research, highlighting the issues around methodology. Therefore, future research must use a rigorous, approach, minimizing confounding factors that are specific to examinations of TOD.

Item Type: Article
Uncontrolled Keywords: Circadian rhythms; Cognitive performance; Diurnal variation; ROB; ROBINS-I; Review; Time-of-day; 1103 Clinical Sciences; 1701 Psychology; Respiratory System
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Q Science > QP Physiology
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Springer Science and Business Media LLC
SWORD Depositor: A Symplectic
Date Deposited: 15 Feb 2024 17:06
Last Modified: 15 Feb 2024 17:06
DOI or ID number: 10.1007/s11325-023-02895-0
URI: https://researchonline.ljmu.ac.uk/id/eprint/22637
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