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Yan J, Bai H, Sun Y, Sun X, Hu Z, Liu B, He C, Zhang X. Frontoparietal Response to Working Memory Load Mediates the Association between Sleep Duration and Cognitive Function in Children. Brain Sci 2024; 14:706. [PMID: 39061446 PMCID: PMC11274878 DOI: 10.3390/brainsci14070706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Revised: 07/07/2024] [Accepted: 07/10/2024] [Indexed: 07/28/2024] Open
Abstract
Lack of sleep has been found to be associated with cognitive impairment in children, yet the neural mechanism underlying this relationship remains poorly understood. To address this issue, this study utilized the data from the Adolescent Brain Cognitive Development (ABCD) study (n = 4930, aged 9-10), involving their sleep assessments, cognitive measures, and functional magnetic resonance imaging (fMRI) during an emotional n-back task. Using partial correlations analysis, we found that the out-of-scanner cognitive performance was positively correlated with sleep duration. Additionally, the activation of regions of interest (ROIs) in frontal and parietal cortices for the 2-back versus 0-back contrast was positively correlated with both sleep duration and cognitive performance. Mediation analysis revealed that this activation significantly mediated the relationship between sleep duration and cognitive function at both individual ROI level and network level. After performing analyses separately for different sexes, it was revealed that the mediation effect of the task-related activation was present in girls (n = 2546). These findings suggest that short sleep duration may lead to deficit in cognitive function of children, particularly in girls, through the modulation of frontoparietal activation during working memory load.
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Affiliation(s)
- Jie Yan
- Department of Physiology, Institute of Brain and Intelligence, Third Military Medical University, Chongqing 400038, China
| | - Haolei Bai
- Department of Physiology, Institute of Brain and Intelligence, Third Military Medical University, Chongqing 400038, China
| | - Yuqing Sun
- State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing 100875, China
| | - Xueqi Sun
- Department of Physiology, Institute of Brain and Intelligence, Third Military Medical University, Chongqing 400038, China
| | - Zhian Hu
- Department of Physiology, Institute of Brain and Intelligence, Third Military Medical University, Chongqing 400038, China
| | - Bing Liu
- State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing 100875, China
- Chinese Institute for Brain Research, Beijing 102206, China
| | - Chao He
- Department of Physiology, Institute of Brain and Intelligence, Third Military Medical University, Chongqing 400038, China
| | - Xiaolong Zhang
- Department of Physiology, Institute of Brain and Intelligence, Third Military Medical University, Chongqing 400038, China
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Ouyang M, Chen T, Chen J, Liu C, Luo H, Yang S, Liao W. The association between sleep duration, bedtime, and cognitive ability in Chinese adults: Evidence from the China family panel studies. Heliyon 2024; 10:e30009. [PMID: 38737242 PMCID: PMC11088265 DOI: 10.1016/j.heliyon.2024.e30009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 04/09/2024] [Accepted: 04/18/2024] [Indexed: 05/14/2024] Open
Abstract
Introduction Dementia is marked by a steady decline or worsening in cognitive abilities, affecting memory, logic, and social competencies. While many studies suggest a potential link between the amount of sleep and dementia risk, the outcomes are not yet consistent. This research delved into the relationship between sleep length and bedtime on cognitive abilities using an extensive dataset from the China Family Panel Studies (CFPS) from 2014 to 2020. Methods Data from 175,702 observations were collected, including cognitive function test data from 22,848 participants. Various cognitive tests were used to assess cognitive function. Restricted cubic spline (RCS) models were used for data analysis. Results The optimal sleep duration for cognitive function was found to be 6-7 h, and the optimal bedtime was generally between 22:00-23:00. Longitudinal analysis revealed that sleep duration four years prior had a significant impact on current cognitive function. After accounting for various factors, those who slept for 7-8 h and over 8 h displayed lower cognitive function scores. Conversely, individuals sleeping less than 6 h had higher scores on the Vocabulary Test. Bedtime before 22:00 was associated with lower scores on the Vocabulary Test and Mathematical Test. Subgroup analyses based on age, gender, and urban residence showed variations in optimal sleep duration for different populations. Propensity Score Matching (PSM) analysis supported the findings. Conclusions Maintaining a sleep duration of 6-7 h and a regular bedtime between 22:00-23:00 is important for optimizing cognitive performance.
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Affiliation(s)
- Mengqian Ouyang
- Department of Economics, Guangdong Institute of Public Administration, Guangzhou, China
| | - Tao Chen
- Structural Cardiology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, China
| | - Jiawei Chen
- Department of Neurology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Chongxu Liu
- Department of Neurology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Haoyu Luo
- Department of Neurology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Shaoqing Yang
- Department of Neurology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Wang Liao
- Department of Neurology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
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Wiranto Y, Siengsukon C, Mazzotti DR, Burns JM, Watts A. Sex Differences in the Role of Sleep on Cognition in Older Adults. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2024:2024.01.08.24300996. [PMID: 38633788 PMCID: PMC11023683 DOI: 10.1101/2024.01.08.24300996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/19/2024]
Abstract
Study Objectives The study aimed to investigate sex differences in the relationship between sleep quality (self-report and objective) and cognitive function across three domains (executive function, verbal memory, and attention) in older adults. Methods We analyzed cross-sectional data from 207 participants with normal cognition or mild cognitive impairment (89 males and 118 females) aged over 60. The relationship between sleep quality and cognitive performance was estimated using generalized additive models. Objective sleep was measured with the GT9X Link Actigraph, and self-reported sleep was measured with the Pittsburgh Sleep Quality Index. Results We found that females exhibited stable performance of executive function with up to about 400 minutes of total sleep time, with significant declines in performance (p = 0.02) when total sleep time was longer. Additionally, a longer total sleep time contributed to lower verbal memory in a slightly non-linear manner (p = 0.03). Higher self-reported sleep complaints were associated with poorer executive function in females with normal cognition (p = 0.02). In males, a positive linear relationship emerged between sleep efficiency and executive function (p = 0.04), while self-reported sleep was not associated with cognitive performance in males with normal cognition. Conclusions Our findings suggest that the relationships between sleep quality and cognition differ between older males and females, with executive function being the most influenced by objective and self-reported sleep. Interventions targeting sleep quality to mitigate cognitive decline in older adults may need to be tailored according to sex, with distinct approaches for males and females.
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Affiliation(s)
- Yumiko Wiranto
- Department of Psychology, University of Kansas, Lawrence, Kansas, United States of America
| | - Catherine Siengsukon
- University of Kansas Medical Center, Department of Physical Therapy and Rehabilitation Science, Kansas City, KS USA
| | - Diego R. Mazzotti
- Division of Medical Informatics, Department of Internal Medicine, University of Kansas Medical Center
- Division of Pulmonary Critical Care and Sleep Medicine, Department of Internal Medicine, University of Kansas Medical Center
| | - Jeffrey M. Burns
- University of Kansas, Alzheimer’s Disease Research Center, Fairway, Kansas, United States of America
| | - Amber Watts
- Department of Psychology, University of Kansas, Lawrence, Kansas, United States of America
- University of Kansas, Alzheimer’s Disease Research Center, Fairway, Kansas, United States of America
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Curtis AF, Costa AN, Musich M, Schmiedeler A, Jagannathan S, Connell M, Atkinson A, Miller MB, McCrae CS. Sex as a moderator of the sleep and cognition relationship in middle-aged and older adults: A preliminary investigation. Behav Sleep Med 2024; 22:14-27. [PMID: 36809223 DOI: 10.1080/15402002.2023.2177293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVES Despite known sex differences in the prevalence of sleep disturbance and cognitive impairment, research investigating sex differences in sleep/cognition associations is limited. We examined sex as a moderator of associations between self-reported sleep and objective cognition in middle-aged/older adults. METHODS Adults aged 50+ (32 men/31 women, Mage = 63.6 ± 7.7) completed the Pittsburgh Sleep Quality Index (PSQI) and cognitive tasks: Stroop (processing speed, inhibition), Posner (spatial attentional orienting) and Sternberg (working memory). Multiple regressions examined whether PSQI metrics (global score, sleep quality ratings, sleep duration, sleep efficiency) were independently or interactively (with sex) associated with cognition, controlling for age and education. RESULTS Sex interacted with sleep quality ratings in its association with endogenous spatial attentional orienting (∆R2 = .10, p = .01). Worse ratings of sleep quality were associated with worse orienting in women (B = 22.73, SE = 9.53, p = .02), not men (p = .24). Sex interacted with sleep efficiency in its associations with processing speed (∆R2 = .06, p = .04). Lower sleep efficiency was associated with slower Stroop control trial performance in women (B = -15.91, SE = 7.57, p = .04), not men (p = .48). CONCLUSIONS Preliminary findings suggest middle-aged/older women are more vulnerable to associations between poor sleep quality and low sleep efficiency on spatial attentional orienting and processing speed, respectively. Future studies in larger samples investigating sex-specific prospective sleep and cognition associations are warranted.
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Affiliation(s)
- Ashley F Curtis
- College of Nursing, University of South Florida, Tampa, Florida, USA
- Department of Psychiatry, University of Missouri-Columbia, Columbia, Missouri, USA
- Department of Psychological Sciences, University of Missouri-Columbia, Columbia, Missouri, USA
| | - Amy N Costa
- Department of Psychological Sciences, University of Missouri-Columbia, Columbia, Missouri, USA
| | - Madison Musich
- Department of Psychiatry, University of Missouri-Columbia, Columbia, Missouri, USA
| | - Anthony Schmiedeler
- Department of Psychiatry, University of Missouri-Columbia, Columbia, Missouri, USA
- Department of Educational, School, and Counseling Psychology, University of Missouri-Columbia, Columbia, Missouri, USA
| | | | - Maggie Connell
- Department of Psychiatry, University of Missouri-Columbia, Columbia, Missouri, USA
| | - Angela Atkinson
- Department of Psychiatry, University of Missouri-Columbia, Columbia, Missouri, USA
| | - Mary Beth Miller
- Department of Psychiatry, University of Missouri-Columbia, Columbia, Missouri, USA
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Dahat P, Toriola S, Satnarine T, Zohara Z, Adelekun A, Seffah KD, Dardari L, Salib K, Taha M, Khan S. Correlation of Various Sleep Patterns on Different Types of Memory Retention: A Systematic Review. Cureus 2023; 15:e42294. [PMID: 37614274 PMCID: PMC10442850 DOI: 10.7759/cureus.42294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 07/22/2023] [Indexed: 08/25/2023] Open
Abstract
Sleep has a substantial impact on memory consolidation, although the link between specific sleep patterns and different forms of memory retention is not well-understood. The purpose of this systematic review is to investigate the correlation between varying sleep habits and memory recall. To identify pertinent research published between 2017 and 2023, a thorough check of electronic databases was carried out. Inclusion criteria encompassed peer-reviewed articles published in English, focusing on human participants, and investigating the relationship between sleep patterns and memory retention. Data extraction and quality assessment were performed on selected studies. This research used different strategies and examined several forms of memory retention, including declarative memory, procedural memory, and emotional memory. Several sleep patterns, including sleep duration, sleep stages, and sleep continuity, were investigated. This comprehensive study demonstrated the relationship between adequate sleep duration and memory consolidation, particularly in regard to declarative memory. Furthermore, deep sleep, characterized by slow-wave sleep (SWS), has been associated with superior procedural memory retention. Sleep continuity, as evaluated by reduced sleep fragmentation or undisturbed sleep, influenced memory consolidation across multiple categories of memory. However, the relationship between rapid eye movement (REM) sleep and memory retention remains inconclusive due to conflicting findings. This systematic review emphasizes the significance of various sleep patterns in memory retention. Memory consolidation corresponds with adequate sleep length, deep sleep (or SWS), and sleep continuity. Future research ought to investigate the connection between REM sleep and memory retention. Understanding the impact of specific sleep patterns on memory processes might help guide therapies and interventions to improve memory consolidation and overall cognitive functioning.
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Affiliation(s)
- Purva Dahat
- Medical School, St. Martinus University, Williemstad, CUW
- Research, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Stacy Toriola
- Pathology, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Travis Satnarine
- Pediatrics, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Zareen Zohara
- Internal Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfax, USA
| | - Ademiniyi Adelekun
- Family Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Kofi D Seffah
- Internal Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
- Internal Medicine, Piedmont Athens Regional Medical, Athens, USA
| | - Lana Dardari
- Internal Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Korlos Salib
- General Practice, El Demerdash Hospital, Cairo, EGY
- General Practice, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Maher Taha
- Internal Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Safeera Khan
- Internal Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
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Wright CJ, Milosavljevic S, Pocivavsek A. The stress of losing sleep: Sex-specific neurobiological outcomes. Neurobiol Stress 2023; 24:100543. [PMID: 37252645 PMCID: PMC10209346 DOI: 10.1016/j.ynstr.2023.100543] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 03/20/2023] [Accepted: 05/06/2023] [Indexed: 05/31/2023] Open
Abstract
Sleep is a vital and evolutionarily conserved process, critical to daily functioning and homeostatic balance. Losing sleep is inherently stressful and leads to numerous detrimental physiological outcomes. Despite sleep disturbances affecting everyone, women and female rodents are often excluded or underrepresented in clinical and pre-clinical studies. Advancing our understanding of the role of biological sex in the responses to sleep loss stands to greatly improve our ability to understand and treat health consequences of insufficient sleep. As such, this review discusses sex differences in response to sleep deprivation, with a focus on the sympathetic nervous system stress response and activation of the hypothalamic-pituitary-adrenal (HPA) axis. We review sex differences in several stress-related consequences of sleep loss, including inflammation, learning and memory deficits, and mood related changes. Focusing on women's health, we discuss the effects of sleep deprivation during the peripartum period. In closing, we present neurobiological mechanisms, including the contribution of sex hormones, orexins, circadian timing systems, and astrocytic neuromodulation, that may underlie potential sex differences in sleep deprivation responses.
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Affiliation(s)
| | | | - Ana Pocivavsek
- Corresponding author. Pharmacology, Physiology, and Neuroscience, USC School of Medicine, Columbia, SC, 29208, USA.
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Ling Y, Yuan S, Huang X, Tan S, Huang T, Xu A, Lyu J. The association of night shift work with the risk of all-cause dementia and Alzheimer's disease: a longitudinal study of 245,570 UK Biobank participants. J Neurol 2023:10.1007/s00415-023-11672-8. [PMID: 37022480 DOI: 10.1007/s00415-023-11672-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/14/2023] [Accepted: 03/15/2023] [Indexed: 04/07/2023]
Abstract
BACKGROUND The purpose of this research was to investigate a possible link between night shift work and the development of all-cause dementia and Alzheimer's disease (AD), as well as determine the contribution of night shift work, genetic susceptibility to AD. METHODS This study was conducted using the UK Biobank database. 245,570 participants with a mean follow-up length of 13.1 years were included. A Cox proportional hazards model was used to investigate the link between night shift work and the development of all-cause dementia or AD. RESULTS We counted a total of 1248 participants with all-cause dementia. In the final multivariable adjusted model, the risk of dementia was highest in always night shift workers (HR 1.465, 95% CI 1.058-2.028, P = 0.022), followed by irregular shift workers (HR 1.197, 95% CI 1.026-1.396, P = 0.023). AD events were recorded in 474 participants during the follow-up period. After final multivariate adjustment of model, always night shift workers remained at the highest risk (HR 2.031, 95% CI 1.269-3.250, P = 0.003). Moreover, always night shift workers were associated with a higher risk of AD in both low, intermediate and high AD-GRS groups. CONCLUSIONS Always night shift work had a higher risk of developing all-cause dementia and AD. Irregular shift workers had a higher risk of developing all-cause dementia than no shift workers. Always night shift work had a higher AD risk, regardless of whether they had a high, intermediate or low AD-GRS.
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Affiliation(s)
- Yitong Ling
- Department of Neurology, Jinan University First Affiliated Hospital, Guangzhou, Guangdong, China
| | - Shiqi Yuan
- Department of Neurology, Jinan University First Affiliated Hospital, Guangzhou, Guangdong, China
| | - Xiaxuan Huang
- Department of Neurology, Jinan University First Affiliated Hospital, Guangzhou, Guangdong, China
| | - Shanyuan Tan
- Department of Neurology, Jinan University First Affiliated Hospital, Guangzhou, Guangdong, China
| | - Tao Huang
- Department of Clinical Research, Jinan University First Affiliated Hospital, Guangzhou, Guangdong, China
| | - Anding Xu
- Department of Neurology, Jinan University First Affiliated Hospital, Guangzhou, Guangdong, China.
| | - Jun Lyu
- Department of Clinical Research, Jinan University First Affiliated Hospital, Guangzhou, Guangdong, China.
- Guangdong Provincial Key Laboratory of Traditional Chinese Medicine Informatization, Guangzhou, Guangdong, China.
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朱 玥, 龚 姝. [Research Progress in the Effect of Sleep Deprivation on Working Memory and Its Mechanisms]. SICHUAN DA XUE XUE BAO. YI XUE BAN = JOURNAL OF SICHUAN UNIVERSITY. MEDICAL SCIENCE EDITION 2023; 54:240-245. [PMID: 36949679 PMCID: PMC10409174 DOI: 10.12182/20230260304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Indexed: 03/24/2023]
Abstract
The incidence of sleep deprivation is increasing year by year and people are also paying more attention to the effects of sleep deprivation on the human body and on cognition. In addition, working memory is the foundation of many advanced cognitive functions. Therefore, we reviewed, herein, the relevant research literature on the influence of sleep deprivation on working memory, the relevant influencing factors, and possible mechanisms of action, intending to acquire a more thorough understanding of the effects of sleep deprivation on working memory and to provide evidence for scientific and sound strategies of sleep.
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Affiliation(s)
- 玥 朱
- 四川大学华西护理学院/四川大学华西医院 心脏大血管外科 (成都 610041)West China School of Nursing, Sichuan University/Department of Cardiovascular Surgery, West China Hospital, Sichuan University, Chengdu 610041, China
| | - 姝 龚
- 四川大学华西护理学院/四川大学华西医院 心脏大血管外科 (成都 610041)West China School of Nursing, Sichuan University/Department of Cardiovascular Surgery, West China Hospital, Sichuan University, Chengdu 610041, China
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Zhou L, Kong J, Li X, Ren Q. Sex differences in the effects of sleep disorders on cognitive dysfunction. Neurosci Biobehav Rev 2023; 146:105067. [PMID: 36716906 DOI: 10.1016/j.neubiorev.2023.105067] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 01/24/2023] [Accepted: 01/26/2023] [Indexed: 01/29/2023]
Abstract
Sleep is an essential physiological function that sustains human life. Sleep disorders involve problems with the quality, duration, and abnormal behaviour of sleep. Insomnia is the most common sleep disorder, followed by sleep-disordered breathing (SDB). Sleep disorders often occur along with medical conditions or other mental health conditions. Of particular interest to researchers is the role of sleep disorders in cognitive dysfunction. Sleep disorder is a risk factor for cognitive dysfunction, yet the exact pathogenesis is still far from agreement. Little is known about how sex differences influence the changes in cognitive functions caused by sleep disorders. This narrative review examines how sleep disorders might affect cognitive impairment, and then explores the sex-specific consequences of sleep disorders as a risk factor for dementia and the potential underlying mechanisms. Some insights on the direction of further research are also presented.
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Affiliation(s)
- Lv Zhou
- School of Medicine, Southeast University, Nanjing 210009, China
| | - Jingting Kong
- School of Medicine, Southeast University, Nanjing 210009, China
| | - Xiaoli Li
- School of Medicine, Southeast University, Nanjing 210009, China; Department of Neurology, Affiliated ZhongDa Hospital of Southeast University, Nanjing 210009, China
| | - Qingguo Ren
- School of Medicine, Southeast University, Nanjing 210009, China; Department of Neurology, Affiliated ZhongDa Hospital of Southeast University, Nanjing 210009, China.
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Abstract
OBJECTIVE To examine sex-specific associations of sleep duration and napping self-reported at mean age of 69 years (range: 53-81) with risk of incident dementia 24 years later at age 90 +. METHOD Analytic sample included individuals from a population-based study who reported sleep and napping once in the 1980s and 24 years later (range: 16-38) joined The 90+ Study and were evaluated in-person. Those without dementia at baseline of The 90+ Study were prospectively followed. Hazard ratios [HR] and 95% confidence intervals [CI] of dementia risk were estimated by Cox regression. RESULTS Of 574 participants 71% were women, mean age at start of dementia follow-up with The 90+ Study was 93 years (range: 90-102). After 3.3 years (range: 0.4-13.8) of follow-up 47% developed dementia. Higher risk of dementia at age 90+ was seen in women with <6 hours of self-reported sleep per night (adjusted HR = 2.00; 95% CI = 1.15-3.50; p = .01) compared with 8 hours. Lower risk of dementia at 90+ was seen in men with short-to-moderate (<60 minutes) self-reported naps compared with no naps (HR = 0.33; 95% CI = 0.18-0.63; p < .01). CONCLUSIONS Sleep and nap 24 years earlier are important risk factors for dementia after age 90.
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Rabinowitz JA, An Y, He L, Alfini AJ, Zipunnikov V, Wu MN, Wanigatunga SK, Schrack JA, Jackson CL, Ferrucci L, Simonsick EM, Resnick SM, Spira AP. Associations of circadian rest/activity rhythms with cognition in middle-aged and older adults: Demographic and genetic interactions. Front Neurosci 2022; 16:952204. [PMID: 36312032 PMCID: PMC9597505 DOI: 10.3389/fnins.2022.952204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 09/14/2022] [Indexed: 11/13/2022] Open
Abstract
Objectives Wrist actigraphs (accelerometers) can record motor activity over multiple days and nights. The resulting data can be used to quantify 24-h activity profiles, known as circadian rest-activity rhythms (CRARs). Actigraphic CRARs have been tied to cognitive performance and decline in older adults; however, little is known about links between CRARs and performance or change in specific cognitive domains, or how individual differences may influence these associations. We investigated associations of actigraphic CRARs with cognitive performance and change in middle-aged and older adults, and explored whether age, sex/gender, race, and apolipoprotein E (APOE) e4 carrier status moderated these associations. Materials and methods Participants (N = 422; 47% male) were cognitively healthy adults (i.e., without mild cognitive impairment or dementia) at baseline aged ≥ 50 years from the Baltimore Longitudinal Study of Aging who completed 5.6 ± 0.89 nights of wrist actigraphy and tests of memory, executive function, attention, language, and visuospatial ability at the same visit the actigraph was issued; 292 participants had repeat cognitive testing 3.12 (1.58) years later. Predictors included indices of rhythm strength [i.e., amplitude; relative amplitude (RA); interdaily stability (IS); mesor], delayed timing of the rhythm peak [i.e., later acrophase; midpoint of an individual's least active 5 h (L5 time); midpoint of an individual's most active 10 h (M10 time)], and fragmentation [i.e., intradaily variability (IV)]. Results In main effects, later L5 time was cross sectionally associated with poorer memory, and greater IS predicted slower longitudinal memory decline. Associations of CRARs with cognition differed as a function of age, sex/gender, race, and APOE e4 carrier status. Conclusion Among middle-aged and older adults, delayed circadian phase is associated with poorer memory performance, and greater day-to-day rhythm stability is associated with slower declines in memory. Significant interactions suggest that CRARs are generally more strongly associated with cognitive performance and rate of cognitive decline among women, Black adults, older individuals, and APOE e4 carriers. Replication in independent samples is needed.
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Affiliation(s)
- Jill A. Rabinowitz
- Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Yang An
- Intramural Research Program, National Institute on Aging, Baltimore, MD, United States
| | - Linchen He
- Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Alfonso J. Alfini
- National Center on Sleep Disorders Research, Division of Lung Diseases, National Heart, Lung, and Blood Institute, Bethesda, MD, United States
- Department of Neurology and Neurosurgery, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Vadim Zipunnikov
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Mark N. Wu
- National Center on Sleep Disorders Research, Division of Lung Diseases, National Heart, Lung, and Blood Institute, Bethesda, MD, United States
- Department of Neurology and Neurosurgery, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Sarah K. Wanigatunga
- Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Jennifer A. Schrack
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
- Center on Aging and Health, Johns Hopkins University, Baltimore, MD, United States
| | - Chandra L. Jackson
- Epidemiology Branch, Department of Health and Human Services, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, Durham, NC, United States
- Intramural Research Program, National Institute on Minority Health and Health Disparities, Bethesda, MD, United States
| | - Luigi Ferrucci
- Intramural Research Program, National Institute on Aging, Baltimore, MD, United States
| | - Eleanor M. Simonsick
- Intramural Research Program, National Institute on Aging, Baltimore, MD, United States
| | - Susan M. Resnick
- Intramural Research Program, National Institute on Aging, Baltimore, MD, United States
| | - Adam P. Spira
- Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
- Center on Aging and Health, Johns Hopkins University, Baltimore, MD, United States
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, MD, United States
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Schneider AC, Moon C, Whitaker KM, Zhang D, Carr LJ, Bao W, Xiao Q. Cross-sectional and prospective associations between self-reported sleep characteristics and cognitive function in men and women: The Midlife in the United States study. J Sleep Res 2021; 31:e13515. [PMID: 34766410 DOI: 10.1111/jsr.13515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 10/20/2021] [Accepted: 10/21/2021] [Indexed: 11/30/2022]
Abstract
Sleep behaviour is an important contributing factor in healthy human ageing and cognitive function. Previous studies have linked sleep deficiency with cognitive decline in older adults. However, there is need for more prospective investigations that focus on specific domains of cognitive function. The present study analysed cross-sectional and prospective associations between self-reported sleep and cognitive function in the Midlife in the United States (MIDUS) study. Weekday and weekend sleep duration and habitual sleep quality were obtained via questionnaire data. Brief Test of Adult Cognition by Telephone was conducted to assess overall cognitive function, as well as episodic memory and executive function. We found significant trend for both long weekday and weekend sleep (>8 hr) and lower episodic memory scores in the overall sample. Sex-specific cross-sectional analysis demonstrated men with longer weekend sleep duration have lower overall cognitive function scores, and a negative association between weekend sleep and episodic memory scores. Women demonstrated a positive association between weekend sleep duration and executive function scores. There was no prospective significance for overall or sex-specific analysis. Our present results suggest that sleep duration may contribute to cognitive function, and future studies should include objective sleep measurements and focus on the potential cognitive benefits of improving sleep to further elucidate this association.
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Affiliation(s)
- Aaron C Schneider
- Department of Health and Human Physiology, University of Iowa, Iowa City, IA, USA
| | - Chooza Moon
- College of Nursing, University of Iowa, Iowa City, IA, USA
| | - Kara M Whitaker
- Department of Health and Human Physiology, University of Iowa, Iowa City, IA, USA.,Department of Epidemiology, College of Public Health, University of Iowa, Iowa City, IA, USA
| | - Dong Zhang
- Department of Family and Preventive Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Lucas J Carr
- Department of Health and Human Physiology, University of Iowa, Iowa City, IA, USA
| | - Wei Bao
- Department of Epidemiology, College of Public Health, University of Iowa, Iowa City, IA, USA
| | - Qian Xiao
- Department of Epidemiology, Human Genetics, Environmental Sciences, The University of Texas Health Science Center at Houston, Houston, TX, USA
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13
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Li W, Sun N, Kondracki A, Sun W. Sex, Sleep Duration, and the Association of Cognition: Findings from the China Health and Retirement Longitudinal Study. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph181910140. [PMID: 34639442 PMCID: PMC8508459 DOI: 10.3390/ijerph181910140] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 09/17/2021] [Accepted: 09/24/2021] [Indexed: 12/24/2022]
Abstract
BACKGROUND We aimed to examine the association between sleep duration and cognitive impairment among elderly Chinese people. METHODS generalized linear modeling was used to analyze the baseline data for adults aged 65 years and over (n = 4785) selected from the 2011 China Health and Retirement Longitudinal Study (CHARLS). The two aspects of cognitive impairment assessed in the study were mental status and memory. Sex-stratified logistic regression models were conducted to identify the effect of sleep duration in the different gender groups. RESULTS of all the participants, 49.8% were females and 32.5% aged 75 years and over. Of the participants, 59.7% had short sleep duration (<7 h/day), and 9.0% of them had long sleep duration (>8 h/day). Compared to normal sleep duration, long sleep duration was associated with lower mental status scores (β = -0.43, p = 0.001) and lower memory scores (β = -0.26, p = 0.006). Long sleep duration was associated with lower mental status in both men (β = -0.37, p = 0.033) and women (β = -0.46, p = 0.025), however, only in men was long sleep duration found to be associated with low memory scores (β = -0.26, p = 0.047). CONCLUSIONS Our study showed that long sleep duration was significantly associated with poorer mental status and memory scores in elderly Chinese people. Paying greater attention to the effects of sleep patterns on the risk of cognitive decline may yield practical implications for dementia prevention and health promotion, especially among older women with lower educational attainment, living in rural areas, and those who have long sleep duration.
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Affiliation(s)
- Wei Li
- Department of Epidemiology, Robert Stempel College of Public Health, Florida International University, Miami, FL 33199, USA; (W.L.); (N.S.)
| | - Ning Sun
- Department of Epidemiology, Robert Stempel College of Public Health, Florida International University, Miami, FL 33199, USA; (W.L.); (N.S.)
| | - Anthony Kondracki
- Department of Community Medicine, School of Medicine, Mercer University, Savannah, GA 31404, USA;
| | - Wenjie Sun
- School of Public Health and Tropical Medicine, Tulane University, New Orleans, LA 70112, USA
- Correspondence: ; Tel.: +50-498-842-23
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14
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Vaseghi S, Arjmandi-Rad S, Kholghi G, Nasehi M. Inconsistent effects of sleep deprivation on memory function. EXCLI JOURNAL 2021; 20:1011-1027. [PMID: 34267613 PMCID: PMC8278215 DOI: 10.17179/excli2021-3764] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 05/26/2021] [Indexed: 12/12/2022]
Abstract
In this review article, we aimed to discuss the role of sleep deprivation (SD) in learning and memory processing in basic and clinical studies. There are numerous studies investigating the effect of SD on memory, while most of these studies have shown the impairment effect of SD. However, some of these studies have reported conflicting results, indicating that SD does not impair memory performance or even improves it. So far, no study has discussed or compared the conflicting results of SD on learning and memory. Thus, this important issue in the neuroscience of sleep remains unknown. The main goal of this review article is to compare the similar mechanisms between the impairment and the improvement effects of SD on learning and memory, probably leading to a scientific solution that justifies these conflicting results. We focused on the inconsistent effects of SD on some mechanisms involved in learning and memory, and tried to discuss the inconsistent effects of SD on learning and memory.
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Affiliation(s)
- Salar Vaseghi
- Cognitive and Neuroscience Research Center (CNRC), Amir-Almomenin Hospital, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.,Department of Cognitive Neuroscience, Institute for Cognitive Science Studies (ICSS), Tehran, Iran
| | - Shirin Arjmandi-Rad
- Institute for Cognitive & Brain Sciences, Shahid Beheshti University, Tehran, Iran
| | - Gita Kholghi
- Cognitive and Neuroscience Research Center (CNRC), Amir-Almomenin Hospital, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Mohammad Nasehi
- Cognitive and Neuroscience Research Center (CNRC), Amir-Almomenin Hospital, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
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15
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Gao C, Fillmore P, Scullin MK. Classical music, educational learning, and slow wave sleep: A targeted memory reactivation experiment. Neurobiol Learn Mem 2020; 171:107206. [PMID: 32145407 DOI: 10.1016/j.nlm.2020.107206] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 01/20/2020] [Accepted: 03/02/2020] [Indexed: 11/19/2022]
Abstract
Poor sleep in college students compromises the memory consolidation processes necessary to retain course materials. A solution may lie in targeting reactivation of memories during sleep (TMR). Fifty undergraduate students completed a college-level microeconomics lecture (mathematics-based) while listening to distinctive classical music (Chopin, Beethoven, and Vivaldi). After they fell asleep, we re-played the classical music songs (TMR) or a control noise during slow wave sleep. Relative to the control condition, the TMR condition showed an 18% improvement for knowledge transfer items that measured concept integration (d = 0.63), increasing the probability of "passing" the test with a grade of 70 or above (OR = 4.68, 95%CI: 1.21, 18.04). The benefits of TMR did not extend to a 9-month follow-up test when performance dropped to floor levels, demonstrating that long-term-forgetting curves are largely resistant to experimentally-consolidated memories. Spectral analyses revealed greater frontal theta activity during slow wave sleep in the TMR condition than the control condition (d = 0.87), and greater frontal theta activity across conditions was associated with protection against long-term-forgetting at the next-day and 9-month follow-up tests (rs = 0.42), at least in female students. Thus, students can leverage instrumental music-which they already commonly pair with studying-to help prepare for academic tests, an approach that may promote course success and persistence.
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Affiliation(s)
- Chenlu Gao
- Baylor University, Department of Psychology and Neuroscience, Waco, TX, United States
| | - Paul Fillmore
- Baylor University, Department of Communication Sciences and Disorders, Waco, TX, United States
| | - Michael K Scullin
- Baylor University, Department of Psychology and Neuroscience, Waco, TX, United States.
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16
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He JW, Tu ZH, Xiao L, Su T, Tang YX. Effect of restricting bedtime mobile phone use on sleep, arousal, mood, and working memory: A randomized pilot trial. PLoS One 2020; 15:e0228756. [PMID: 32040492 PMCID: PMC7010281 DOI: 10.1371/journal.pone.0228756] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 01/22/2020] [Indexed: 12/19/2022] Open
Abstract
Background This study aimed to assess the effects of restricting mobile phone use before bedtime on sleep, pre-sleep arousal, mood, and working memory. Methods Thirty-eight participants were randomized to either an intervention group (n = 19), where members were instructed to avoid using their mobile phone 30 minutes before bedtime, or a control group (n = 19), where the participants were given no such instructions. Sleep habit, sleep quality, pre-sleep arousal and mood were measured using the sleep diary, the Pittsburgh sleep quality index, the Pre-sleep Arousal Scale and the Positive and Negative Affect Schedule respectively. Working memory was tested by using the 0-,1-,2-back task (n-back task). Results Restricting mobile phone use before bedtime for four weeks was effective in reducing sleep latency, increasing sleep duration, improving sleep quality, reducing pre-sleep arousal, and improving positive affect and working memory. Conclusions Restricting mobile phone use close to bedtime reduced sleep latency and pre-sleep arousal and increased sleep duration and working memory. This simple change to moderate usage was recommended to individuals with sleep disturbances.
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Affiliation(s)
- Jing-wen He
- Department of Medical Psychology, the Second Military Medical University, Shanghai, China
| | - Zhi-hao Tu
- Department of Nautical Psychology, the Second Military Medical University, Shanghai, China
| | - Lei Xiao
- Department of Medical Psychology, the Second Military Medical University, Shanghai, China
| | - Tong Su
- Department of Medical Psychology, the Second Military Medical University, Shanghai, China
| | - Yun-xiang Tang
- Department of Medical Psychology, the Second Military Medical University, Shanghai, China
- * E-mail:
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17
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Zhang YW, Li XQ, Tan WF, Fang B, Ma H. Postoperative 24-h Acute Sleep Deprivation Improves Learning and Memory Through Inhibition of Tau Phosphorylation in the Hippocampal Neurons of Splenectomized Rats. Nat Sci Sleep 2020; 12:603-613. [PMID: 32904483 PMCID: PMC7455769 DOI: 10.2147/nss.s254449] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 08/11/2020] [Indexed: 12/23/2022] Open
Abstract
PURPOSE As tau pathology is involved in impaired postoperative learning and memory in rats, we attempted to identify the possible mechanisms by which tau pathology affects postoperative sleep deprivation. METHODS Adult male Sprague-Dawley rats were randomly assigned into six groups as follows: the Control group, Anaesthesia group, Surgery group, Sleep deprivation (SD) group: 24-h SD with the modified multiple platform method (MMPM), Anaesthesia and SD (ASD) group, and Surgery and SD (SSD) group. Tau396 and FOXQ1 protein expression levels in the hippocampal neurons of all groups were analysed. Changes following co-culture of hippocampal neurons with IL-6 were detected by flow cytometry. RESULTS Twenty-four hours of acute SD decreased the error scores on postoperative day 5 in the ASD and SSD groups compared with the Anaesthesia and Surgery groups. Compared with the tau levels in the Control group, tau levels in the Anaesthesia and Surgery groups were increased, but SD decreased the expression of tau in the ASD and SSD groups. The expression levels of tau and FOXQ1 were inversely regulated. When hippocampal neurons were co-cultured with IL-6, the same changes were observed. CONCLUSION Postoperative 24-h acute SD improves learning and memory through inhibition of tau phosphorylation and increases IL-6-induced expression of FOXQ1 in the hippocampal neurons of splenectomized rats.
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Affiliation(s)
- Yu-Wei Zhang
- Department of Anesthesiology, The First Hospital of China Medical University, Shenyang, People's Republic of China.,Department of Anesthesiology, The First Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
| | - Xiao-Qian Li
- Department of Anesthesiology, The First Hospital of China Medical University, Shenyang, People's Republic of China
| | - Wen-Fei Tan
- Department of Anesthesiology, The First Hospital of China Medical University, Shenyang, People's Republic of China
| | - Bo Fang
- Department of Anesthesiology, The First Hospital of China Medical University, Shenyang, People's Republic of China
| | - Hong Ma
- Department of Anesthesiology, The First Hospital of China Medical University, Shenyang, People's Republic of China
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18
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Chen W. Does More Sleep Time Improve Memory? Evidence for the Middle-Aged and Elderly. AMERICAN JOURNAL OF HEALTH EDUCATION 2019. [DOI: 10.1080/19325037.2019.1662859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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19
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Abstract
Sleep is a behavioral phenomenon conserved among mammals and some invertebrates, yet the biological functions of sleep are still being elucidated. In humans, sleep time becomes shorter, more fragmented, and of poorer quality with advancing age. Epidemiologically, the development of age-related neurodegenerative diseases such as Alzheimer's and Parkinson's disease is associated with pronounced sleep disruption, whereas emerging mechanistic studies suggest that sleep disruption may be causally linked to neurodegenerative pathology, suggesting that sleep may represent a key therapeutic target in the prevention of these conditions. In this review, we discuss the physiology of sleep, the pathophysiology of neurodegenerative disease, and the current literature supporting the relationship between sleep, aging, and neurodegenerative disease.
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Affiliation(s)
- Thierno M Bah
- Department of Anesthesiology and Perioperative Medicine, Oregon Health & Science University, Portland, Oregon, USA
| | - James Goodman
- Department of Anesthesiology and Perioperative Medicine, Oregon Health & Science University, Portland, Oregon, USA
| | - Jeffrey J Iliff
- Department of Anesthesiology and Perioperative Medicine, Oregon Health & Science University, Portland, Oregon, USA.
- Knight Cardiovascular Institute, Oregon Health & Science University, Portland, Oregon, USA.
- Veterans Integrated Service Network 20 Mental Illness Research, Education and Clinical Center, Puget Sound Health Care System, Mail Stop 116-MIRECC, 1660 South Columbian Way, Seattle, Washington, 98108, USA.
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, Washington, USA.
- Department of Neurology, University of Washington School of Medicine, Seattle, Washington, USA.
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20
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Dyakova O, Rångtell FH, Tan X, Nordström K, Benedict C. Acute sleep loss induces signs of visual discomfort in young men. J Sleep Res 2019; 28:e12837. [PMID: 30815934 PMCID: PMC6900002 DOI: 10.1111/jsr.12837] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 01/22/2019] [Accepted: 01/31/2019] [Indexed: 01/24/2023]
Abstract
Acute sleep loss influences visual processes in humans, such as recognizing facial emotions. However, to the best of our knowledge, no study till date has examined whether acute sleep loss alters visual comfort when looking at images. One image statistic that can be used to investigate the level of visual comfort experienced under visual encoding is the slope of the amplitude spectrum, also referred to as the slope constant. The slope constant describes the spatial distribution of pixel intensities and deviations from the natural slope constant can induce visual discomfort. In the present counterbalanced crossover design study, 11 young men with normal or corrected‐to‐normal vision participated in two experimental conditions: one night of sleep loss and one night of sleep. In the morning after each intervention, subjects performed a computerized psychophysics task. Specifically, they were required to adjust the slope constant of images depicting natural landscapes and close‐ups with a randomly chosen initial slope constant until they perceived each image as most natural looking. Subjects also rated the pleasantness of each selected image. Our analysis showed that following sleep loss, higher slope constants were perceived as most natural looking when viewing images of natural landscapes. Images with a higher slope constant are generally perceived as blurrier. The selected images were also rated as less pleasant after sleep loss. No such differences between the experimental conditions were noted for images of close‐ups. The results suggest that sleep loss induces signs of visual discomfort in young men. Possible implications of these findings are discussed.
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Affiliation(s)
- Olga Dyakova
- Department of Neuroscience, Uppsala University, Uppsala, Sweden
| | | | - Xiao Tan
- Department of Neuroscience, Uppsala University, Uppsala, Sweden
| | - Karin Nordström
- Department of Neuroscience, Uppsala University, Uppsala, Sweden.,Centre for Neuroscience, Flinders University, Adelaide, South Australia, Australia
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21
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Sex Differences in the Association between Night Shift Work and the Risk of Cancers: A Meta-Analysis of 57 Articles. DISEASE MARKERS 2018; 2018:7925219. [PMID: 30598709 PMCID: PMC6287141 DOI: 10.1155/2018/7925219] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 09/25/2018] [Indexed: 01/20/2023]
Abstract
Objectives To identify the association between night shift work and the risk of various cancers with a comprehensive perspective and to explore sex differences in this association. Methods We searched PubMed, Embase, and Web of Science for studies on the effect of night shift work on cancer, including case-control, cohort, and nested case-control studies. We computed risk estimates with 95% confidence intervals (CIs) in a random or fixed effects model and quantified heterogeneity using the I 2 statistic. Subgroup, metaregression, and sensitivity analyses were performed to explore potential sources of heterogeneity. Contour-enhanced funnel plots and the trim and fill method were used together to analyze bias. Linear dose-response analysis was used to quantitatively estimate the accumulative effect of night shift work on the risk of cancer. Results Fifty-eight studies were eligible for our meta-analysis, including 5,143,838 participants. In the random effects model, the pooled odds ratio (OR) of cancers was 1.15 (95% CI = 1.08-1.22, P < 0.001; I 2 = 76.2%). Night shift work increased the cancer risk in both men (OR = 1.14, 95% CI = 1.05-1.25, P = 0.003) and women (OR = 1.12, 95% CI = 1.04-1.20, P = 0.002). Subgroup analyses showed that night shift work positively increased the risk of breast (OR = 1.22, 95% CI = 1.08-1.38), prostate (OR = 1.26, 95% CI = 1.05-1.52), and digestive system (OR = 1.15, 95% CI = 1.01-1.32) cancers. For every 5 years of night shift work, the cancer risk increased by 3.2% (OR = 1.032, 95% CI = 1.013-1.051). Conclusion This is the first meta-analysis identifying the positive association between night shift work and the risk of cancer and verifying that there is no sex difference in the effect of night shift work on cancer risk. Cancer risk increases with cumulative years of night shift work.
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22
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Gao C, Terlizzese T, Scullin MK. Short sleep and late bedtimes are detrimental to educational learning and knowledge transfer: An investigation of individual differences in susceptibility. Chronobiol Int 2018; 36:307-318. [PMID: 30409040 DOI: 10.1080/07420528.2018.1539401] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Good sleep hygiene practices, including consistent bedtimes and 7-9 h of sleep/night, are theorized to benefit educational learning. However, individuals differ in how much sleep they need, as well as in their chronotype preference. Therefore, some students may be more vulnerable to the cognitive effects of sleep loss, later bedtimes and nonpreferred times of learning than others. One prominent example is the debate regarding whether sleep loss and later bedtimes affect classroom learning more in female or male students. To inform this gender-and-sleep-loss debate, we developed a virtual college-level lecture to use in a controlled, laboratory setting. During Session 1, 78 undergraduate students were randomly assigned to take the lecture at 12:00 (noon condition) or 19:30 (evening condition). Then participants wore wristband actigraphy for 1 week to monitor average and intraindividual variability in sleep duration, bedtime and midpoint of sleep. During Session 2, participants completed a test at the same time of day as Session 1. The test included basic questions that were similar to trained concepts during the lecture (trained items) as well as integration questions that required application of learned concepts (knowledge-transfer items). Bayesian analyses supported the null hypothesis that time of learning did not affect test performance. Collapsed across time of testing, regression analyses showed that shorter sleep durations and later bedtimes explained 13% of the variance in test performance. Longer sleep durations and earlier bedtimes predicted better test performance primarily in females, younger students and morning-types. Interestingly, students with above-median fluid intelligence scores were resilient to short sleep and late bedtimes. Our findings indicate that both sleep and circadian factors should be addressed to optimize educational learning, particularly in the students who are most susceptible to sleep loss.
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Affiliation(s)
- Chenlu Gao
- a Department of Psychology and Neuroscience , Baylor University , Waco , USA
| | - Taylor Terlizzese
- a Department of Psychology and Neuroscience , Baylor University , Waco , USA
| | - Michael K Scullin
- a Department of Psychology and Neuroscience , Baylor University , Waco , USA
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