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Lai F, Luo Z, Zhang J, Xia W, Tian L. Bright light therapy has a positive effect on sleep quality in patients with cancer: A meta-analysis. Sleep Med Rev 2024; 75:101925. [PMID: 38537515 DOI: 10.1016/j.smrv.2024.101925] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 01/29/2024] [Accepted: 03/17/2024] [Indexed: 06/04/2024]
Abstract
Cancer patients frequently encounter difficulties associated with suboptimal sleep quality. Bright Light Therapy (BLT), an innovative treatment approach, has shown promise in enhancing sleep quality. However, several literature reviews showed conflicting results, and more analysis should be conducted regarding detailed BLT settings on sleep. This meta-analysis was undertaken to comprehensively assess the impact of BLT on sleep quality among cancer patients. Twelve studies with 679 patients were included. Compared with the control group, BLT overall resulted in significant improvements in terms of sleep quality [g = -0.34], total sleep time [g = 0.24], wake after sleep onset [g = -0.80], and fatigue [g = -0.54]. However, it did not yield a statistically significant effect on sleep efficiency, sleep onset latency, and insomnia severity. Regarding light settings, interventions featuring light intensities >5000lux, intervention duration ≥4 weeks, spectral emission peak at 464∼465 nm, and using a lightbox demonstrated heightened efficacy in improving sleep. BLT may be considered a supplementary therapeutic option to improve sleep quality among cancer patients. However, more extensive and rigorous studies are necessary to determine the optimal timing of BLT delivery and its applicability to cancer patients across different age groups.
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Affiliation(s)
- Fengxia Lai
- The First Affiliated Hospital of Soochow University, Suzhou, 215006, China; School of Nursing, Medical College of Soochow University, Suzhou, 215006, China
| | - Zhen Luo
- School of Nursing, Medical College of Soochow University, Suzhou, 215006, China
| | - Jiyin Zhang
- School of Nursing, Medical College of Soochow University, Suzhou, 215006, China
| | - Wangjie Xia
- School of Nursing, Medical College of Soochow University, Suzhou, 215006, China
| | - Li Tian
- The First Affiliated Hospital of Soochow University, Suzhou, 215006, China; School of Nursing, Medical College of Soochow University, Suzhou, 215006, China.
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2
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Yu W, Chen J, Kong Z, Sun W, Zhou X, Lu L, Gao X, Sun H. Understanding the cognitive and neuroimaging bases underlying the detrimental impact of sleep deprivation on reciprocity. iScience 2024; 27:109155. [PMID: 38425845 PMCID: PMC10904273 DOI: 10.1016/j.isci.2024.109155] [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: 06/12/2023] [Revised: 11/24/2023] [Accepted: 02/02/2024] [Indexed: 03/02/2024] Open
Abstract
Although the impact of sleep loss on social behaviors has been widely observed in recent years, the mechanisms underpinning these impacts remain unclear. In this study, we explored the detrimental effects of sleep deprivation on reciprocity behavior as well as its underlying psychological and neuroimaging mechanisms by combining sleep manipulation, an interpersonal interactive game, computational modeling and neuroimaging. Our results suggested that after sleep deprivation, individuals showed reduced reciprocity behavior, mainly due to their reduced weights on communal concern when making social decisions. At neural level, we demonstrated that sleep deprivation's effects were observed in the precuneus (hyperactivity) and temporoparietal junction, dorsal lateral prefrontal cortex (DLPFC) (both hypoactivity), and reduced reciprocity was also accounted for by increased precuneus-thalamus connectivity and DLPFC-thalamus connectivity. Our findings contributed to the understanding of the psychological and neuroimaging bases underlying the deleterious impact of sleep deprivation on social behaviors.
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Affiliation(s)
- Wenwen Yu
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing 100191, China
| | - Jie Chen
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing 100191, China
| | - Zhifei Kong
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing 100191, China
| | - Wei Sun
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing 100191, China
| | - Xiaolin Zhou
- Shanghai Key Laboratory of Mental Health and Psychological Crisis Intervention, School of Psychology and Cognitive Science, East China Normal University, Shanghai 200062, China
- School of Business and Management, Shanghai International Studies University, Shanghai 200083, China
| | - Lin Lu
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing 100191, China
| | - Xiaoxue Gao
- Shanghai Key Laboratory of Mental Health and Psychological Crisis Intervention, School of Psychology and Cognitive Science, East China Normal University, Shanghai 200062, China
| | - Hongqiang Sun
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing 100191, China
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Wang Q, Wu S, Luo Z, Pu L, Wang X, Guo M, Zhang M, Tang H, Chen M, Kong L, Huang P, Chen L, Li Z, Zhao D, Xiong Z. Effects of light therapy on sleep and circadian rhythm in older type 2 diabetics living in long-term care facilities: a randomized controlled trial. Front Endocrinol (Lausanne) 2024; 15:1307537. [PMID: 38375195 PMCID: PMC10876060 DOI: 10.3389/fendo.2024.1307537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 01/11/2024] [Indexed: 02/21/2024] Open
Abstract
Background Light influences the secretion of melatonin in the body and regulates circadian rhythms, which play an important role in sleep and mood. The light level of rooms in long-term care facilities is usually far below the threshold required to regulate the body's circadian rhythm, and insufficient light can easily lead to sleep and mood disturbances among older residents in nursing homes. Therefore, the objective of this study was to investigate the effects of light therapy on sleep and circadian rhythm in older adults with type 2 diabetes residing in long-term care facilities. Methods This study was a prospective, single-blind, randomized controlled trial. Participants were randomly assigned to either the light therapy (LT) group or the control group and received the intervention for four weeks. Primary outcomes included the Pittsburgh Sleep Quality Index (PSQI) and objective sleep parameters recorded by a sleep monitoring bracelet, Morningness-Eveningness Questionnaire (MEQ). The secondary outcome included glycated serum protein (GSP). Data was collected at three time points: at baseline (T0), immediate post-treatment (T1), and 4-week follow-up (T2). A linear mixed model analysis was used to analyzed the data. Results We enrolled 45 long-term care residents. Compared with the control group, significant reductions in PSQI scores were observed at T1 and T2. At T2, the sleep score of objective sleep parameters was significantly higher in the LT group compared to the control group. Additionally, compared to the baseline T0, MEQ scores were significantly lower in the LT group at T1 and T2, with no significant difference in the control group. There was no significant difference between groups in glycated serum protein values at T1 and T2. However, compared to T0, glycated serum protein values decreased in the LT group while increased in the control group at T2. Conclusion Light therapy had a positive effect on subjective sleep quality and circadian rhythm time type in long-term care residents with type 2 diabetes, and had a possible delayed effect on objective sleep. However, no discernible alterations in blood glucose levels were detected in this study.
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Affiliation(s)
- Qin Wang
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
- School of Health and Medicine, Polus International College, Chengdu, Sichuan, China
| | - Shuang Wu
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Zhenhua Luo
- The First Affiliated Hospital of Traditional Chinese Medicine, Chengdu Medical College, Xindu Hospital of Traditional Chinese Medicine, Chengdu, Sichuan, China
| | - Lihui Pu
- Menzies Health Institute Queensland & School of Nursing and Midwifery, Griffith University, Brisbane, QLD, Australia
| | - Xiaoxia Wang
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Maoting Guo
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Mingjiao Zhang
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Hongxia Tang
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Mengjie Chen
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Laixi Kong
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Ping Huang
- School of Health and Medicine, Polus International College, Chengdu, Sichuan, China
| | - Liyuan Chen
- School of Health and Medicine, Polus International College, Chengdu, Sichuan, China
| | - Zhe Li
- Mental Health Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
- Sichuan Clinical Medical Research Center for Mental Disorders, Chengdu, Sichuan, China
| | - Dan Zhao
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Zhenzhen Xiong
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
- Nursing Key Laboratory of Sichuan Province, Chengdu, Sichuan, China
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Costello A, Linning-Duffy K, Vandenbrook C, Donohue K, O'Hara BF, Kim A, Lonstein JS, Yan L. Effects of light therapy on sleep/wakefulness, daily rhythms, and the central orexin system in a diurnal rodent model of seasonal affective disorder. J Affect Disord 2023; 332:299-308. [PMID: 37060954 PMCID: PMC10161688 DOI: 10.1016/j.jad.2023.04.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 03/31/2023] [Accepted: 04/07/2023] [Indexed: 04/17/2023]
Abstract
BACKGROUND Bright light therapy (BLT) is the first-line treatment for seasonal affective disorder. However, the neural mechanisms underlying BLT are unclear. To begin filling this gap, the present study examined the impact of BLT on sleep/wakefulness, daily rhythms, and the wakefulness-promoting orexin/hypocretin system in a diurnal rodent, Nile grass rats (Arvicanthis niloticus). METHODS Male and female grass rats were housed under a 12:12 h light/dark cycle with dim light (50 lx) during the day. The experimental group received daily 1-h early morning BLT (full-spectrum white light, 10,000 lx), while the control group received narrowband red light for 4 weeks. Sleep/wakefulness and in-cage locomotor activity were monitored, followed by examination of hypothalamic prepro-orexin and orexin receptors OX1R and OX2R expression in corticolimbic brain regions. RESULTS The BLT group had higher wakefulness during light treatment, better nighttime sleep quality, and improved daily rhythm entrainment compared to controls. The impact of BLT on the orexin system was sex- and brain region-specific, with males showing higher OX1R and OX2R in the CA1, while females showed higher prepro-orexin but lower OX1R and OX2R in the BLA, compared to same-sex controls. LIMITATIONS The present study focused on the orexin system in a limited number of brain regions at a single time point. Sex wasn't a statistical factor, as male and female cohorts were run independently. CONCLUSIONS The diurnal grass rats show similar behavioral responses to BLT as humans, thus could be a good model for further elucidating the neural mechanisms underlying the therapeutic effects of BLT.
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Affiliation(s)
- Allison Costello
- Department of Psychology, Michigan State University, United States of America.
| | | | | | - Kevin Donohue
- Department of Electrical and Computer Engineering, Michigan State University, United States of America
| | - Bruce F O'Hara
- Department of Biology, University of Kentucky, United States of America
| | - Antony Kim
- Department of Architecture, UC Berkeley, United States of America
| | - Joseph S Lonstein
- Department of Psychology, Michigan State University, United States of America; Neuroscience Program, Michigan State University, United States of America
| | - Lily Yan
- Department of Psychology, Michigan State University, United States of America; Neuroscience Program, Michigan State University, United States of America
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Greco V, Bergamo D, Cuoccio P, Konkoly KR, Muñoz Lombardo K, Lewis PA. Wearing an eye mask during overnight sleep improves episodic learning and alertness. Sleep 2023; 46:zsac305. [PMID: 36521010 PMCID: PMC9995773 DOI: 10.1093/sleep/zsac305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/17/2022] [Indexed: 12/23/2022] Open
Abstract
Ambient light can influence sleep structure and timing. We explored how wearing an eye mask to block light during overnight sleep impacts memory and alertness, changes that could benefit everyday tasks like studying or driving. In Experiment 1, ninety-four 18-35-year-olds wore an eye mask while they slept every night for a week and underwent a control condition in which light was not blocked for another week. Five habituation nights were followed by a cognitive battery on the sixth and seventh days. This revealed superior episodic encoding and an improvement on alertness when using the mask. In Experiment 2, thirty-five 18-35-year-olds used a wearable device to monitor sleep with and without the mask. This replicated the encoding benefit and showed that it was predicted by time spent in slow-wave sleep. Our findings suggest that wearing an eye mask during overnight sleep can improve episodic encoding and alertness the next day.
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Affiliation(s)
- Viviana Greco
- Cardiff University Brain Research Imaging Centre (CUBRIC), School of Psychology, Cardiff University, Cardiff, UK
| | | | - Paola Cuoccio
- Department of Psychology, University of Padua, Padova, Italy
| | - Karen R Konkoly
- Department of Psychology, Northwestern University, Chicago, IL, USA
| | - Kike Muñoz Lombardo
- Cardiff University Brain Research Imaging Centre (CUBRIC), School of Psychology, Cardiff University, Cardiff, UK
| | - Penelope A Lewis
- Cardiff University Brain Research Imaging Centre (CUBRIC), School of Psychology, Cardiff University, Cardiff, UK
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Multi-Omics Reveal Interplay between Circadian Dysfunction and Type2 Diabetes. BIOLOGY 2023; 12:biology12020301. [PMID: 36829576 PMCID: PMC9953493 DOI: 10.3390/biology12020301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 02/06/2023] [Accepted: 02/09/2023] [Indexed: 02/16/2023]
Abstract
Type 2 diabetes is one of the leading threats to human health in the 21st century. It is a metabolic disorder characterized by a dysregulated glucose metabolism resulting from impaired insulin secretion or insulin resistance. More recently, accumulated epidemiological and animal model studies have confirmed that circadian dysfunction caused by shift work, late meal timing, and sleep loss leads to type 2 diabetes. Circadian rhythms, 24-h endogenous biological oscillations, are a fundamental feature of nearly all organisms and control many physiological and cellular functions. In mammals, light synchronizes brain clocks and feeding is a main stimulus that synchronizes the peripheral clocks in metabolic tissues, such as liver, pancreas, muscles, and adipose tissues. Circadian arrhythmia causes the loss of synchrony of the clocks of these metabolic tissues and leads to an impaired pancreas β-cell metabolism coupled with altered insulin secretion. In addition to these, gut microbes and circadian rhythms are intertwined via metabolic regulation. Omics approaches play a significant role in unraveling how a disrupted circadian metabolism causes type 2 diabetes. In the present review, we emphasize the discoveries of several genes, proteins, and metabolites that contribute to the emergence of type 2 diabetes mellitus (T2D). The implications of these discoveries for comprehending the circadian clock network in T2D may lead to new therapeutic solutions.
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7
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Ingram DG, Cranford TA, Al-Shawwa B. Sleep Technology. Sleep Med Clin 2023; 18:235-244. [PMID: 37120166 DOI: 10.1016/j.jsmc.2023.01.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
Abstract
Pediatric sleep providers frequently encounter issues related to sleep technology in clinical settings. In this review article, we discuss technical issues related to standard polysomnography, research on putative complementary novel metrics derived from polysomnographic signals as well as research on home sleep apnea testing in children and consumer sleep devices. Although developments across several of these domains are exciting, it remains a rapidly evolving area. When evaluating innovative devices and home sleep testing approaches, clinicians should be mindful of accurately interpreting diagnostic agreement statistics to apply these technologies appropriately.
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Zhang M, Wang Q, Pu L, Tang H, Chen M, Wang X, Li Z, Zhao D, Xiong Z. Light Therapy to Improve Sleep Quality in Older Adults Living in Residential Long-Term Care: A Systematic Review. J Am Med Dir Assoc 2023; 24:65-74.e1. [PMID: 36410392 DOI: 10.1016/j.jamda.2022.10.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 10/14/2022] [Accepted: 10/14/2022] [Indexed: 11/19/2022]
Abstract
OBJECTIVES Because light can regulate sleep rhythms, numerous studies have investigated whether light therapy can improve sleep disorders in older people, but its efficacy remains controversial. Therefore, this systematic review aimed to examine and summarize current evidence about the efficacy of light therapy to improve sleep for older people in residential long-term care. DESIGN Systematic review. SETTING AND PARTICIPANTS Older people living in long-term care settings. METHODS Systematic searches were conducted in the databases PubMed, Web of Science, Cochrane, EMBASE, CINAHL, China National Knowledge Infrastructure, China Science and Technology Journal Database, WanFang, Chinese Biomedical Literature Database, and in reference lists within relevant articles. Studies were eligible for inclusion if they evaluated light therapy for older people with sleep disorders in long-term care settings. RESULTS This systematic review includes 21 articles, summarizing light therapy with different durations and intensities. The light intervention was typically administered between 7:00 and 12:00 am for 30-120 minutes. The interventions lasted from 1 week to several months, and the intensity of the light intervention usually ranged from 2500 to 10,000 lux. Short-term exposure (30-60 minutes) with high light levels (≥10,000 lux), relatively long-term exposure (1-2 hours) with moderate light levels (2500-10,000 lux), or long-term exposure (1-4 hours or full day) with low light levels (≤2500 lux) were associated with improved sleep indicators for older people in long-term care settings. CONCLUSIONS AND IMPLICATIONS The efficacy of light therapy in long-term care settings may be affected by the duration of exposure, time and length of intervention, intensity of light, and equipment used to administer the therapy. Further research must be conducted to optimize light therapy parameters. Large, high-quality randomized controlled trials are needed to deepen our understanding of the effects of light therapy on sleep in older people living in long-term care settings.
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Affiliation(s)
- Mingjiao Zhang
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Qin Wang
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Lihui Pu
- Menzies Health Institute Queensland & School of Nursing and Midwifery, Griffith University Nathan Campus, Brisbane, Queensland, Australia
| | - Hongxia Tang
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Mengjie Chen
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Xiaoxia Wang
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China
| | - Zhe Li
- Mental Health Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China; Sichuan Clinical Medical Research Center for Mental Disorders, Chengdu, Sichuan, China
| | - Dan Zhao
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China.
| | - Zhenzhen Xiong
- School of Nursing, Chengdu Medical College, Chengdu, Sichuan, China; Nursing Key Laboratory of Sichuan Province, Chengdu, Sichuan, China.
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The Effectiveness of Blue-Light-Emitting Glasses in Security Guards Exposed to Night Shift Work on Work-Related and General Fatigue: A Randomised Controlled Cross-Over Study. Clocks Sleep 2022; 4:675-687. [PMID: 36547102 PMCID: PMC9777001 DOI: 10.3390/clockssleep4040051] [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: 09/12/2022] [Revised: 11/14/2022] [Accepted: 11/16/2022] [Indexed: 11/25/2022] Open
Abstract
This study aimed to evaluate the effectiveness of glasses that emit blue light in reducing the need for recovery, general fatigue, and stress levels in security guards who work night shifts. Light manipulation is seen as a promising strategy to mitigate complaints related to shift work, such as sleepiness and impaired cognitive performance. In a randomized controlled cross-over study design, 86 Dutch security guards used light-emitting glasses (exposure duration: 30 min) during night shifts in a five week period versus a five week control period without glasses. Measurements (Need for Recovery Scale; Checklist Individual Strength; stress level assessed by a fitness tracker) were performed at baseline, at five weeks, and again at 11 weeks. The chronotype was measured at baseline as a potential covariate. A mixed model for repeated measure analyses showed no significant reduction in the need for recovery, nor a reduction in general fatigue scores, during the intervention period. Paired Samples T-Test analyses showed no significant changes in stress levels for the intervention period. Conclusively, blue light exposure using light-emitting glasses for security guards during night shifts showed no directly measurable effect on the reduced need for recovery, overall fatigue, and stress levels.
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Effects of Lighting Interventions to Improve Sleepiness in Night-Shift Workers: A Systematic Review and Meta-Analysis. Healthcare (Basel) 2022; 10:healthcare10081390. [PMID: 35893212 PMCID: PMC9332364 DOI: 10.3390/healthcare10081390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 07/19/2022] [Accepted: 07/20/2022] [Indexed: 11/28/2022] Open
Abstract
Shift work disrupts an otherwise normal circadian rhythm, which may result in sleepiness among night-shift workers. Artificial light has been shown to alter the light–dark cycle of shift workers and reset or phase shift the biological clock, improving nighttime alertness in workers. However, the effect of light therapy on improving sleepiness in nighttime workers has not been effectively confirmed in nursing clinical studies, and it is worth using relevant studies to provide the best evidence in any clinical setting. Systematic review and meta-analysis were used. The study was performed using PRISMA. Academic Search Complete, Embase, MEDLINE, the Cochrane Library, and CINAHL were searched, from the inception of each database to 27 December 2021. The Cochrane risk of bias tool was used to assess the methodological quality of each study. Standardized mean differences (SMDs) with 95% confidence intervals (CIs) were synthesized using a random-effects model to assess the efficacy of lighting intervention to improve sleepiness in night-shift workers. Sensitivity analysis followed by subgroup analysis was employed to examine heterogeneity. The meta-analysis was performed using Review Manager 5.4.1 software. A total of 14 studies from 7 countries were included. The overall result shows that lighting interventions significantly improved sleepiness. Further, the blue-enriched white light with a color temperature greater than 5000 Kelvin was effective in improving sleepiness of night-shift workers. This study unveils the emergent knowledge that light interventions with blue-enriched white were effective in improving sleepiness for night-shift workers, including nurses. This finding can be applied to ensure patient safety, reduce accidents, and improve work efficiency and job satisfaction. Nurses constitute the largest health professional workforce. We suggest that hospitals can insert blue-enriched white light equipment for night-shift healthcare providers. Several evidence-based suggestions are made for further consideration.
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11
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Neves AR, Albuquerque T, Quintela T, Costa D. Circadian rhythm and disease: Relationship, new insights, and future perspectives. J Cell Physiol 2022; 237:3239-3256. [PMID: 35696609 DOI: 10.1002/jcp.30815] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 05/25/2022] [Accepted: 06/02/2022] [Indexed: 02/01/2023]
Abstract
The circadian system is responsible for internal functions and regulation of the organism according to environmental cues (zeitgebers). Circadian rhythm dysregulation or chronodisruption has been associated with several diseases, from mental to autoimmune diseases, and with life quality change. Following this, some therapies have been developed to correct circadian misalignments, such as light therapy and chronobiotics. In this manuscript, we describe the circadian-related diseases so far investigated, and studies reporting relevant data on this topic, evidencing this relationship, are included. Despite the actual limitations in published work, there is clear evidence of the correlation between circadian rhythm dysregulation and disease origin/development, and, in this way, clock-related therapies emerge as great progress in the clinical field. Future improvements in such interventions can lead to the development of successful chronotherapy strategies, deeply contributing to enhanced therapeutic outcomes.
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Affiliation(s)
- Ana R Neves
- CICS-UBI-Health Sciences Research Centre, Universidade da Beira Interior, Covilhã, Portugal
| | - Tânia Albuquerque
- CICS-UBI-Health Sciences Research Centre, Universidade da Beira Interior, Covilhã, Portugal
| | - Telma Quintela
- CICS-UBI-Health Sciences Research Centre, Universidade da Beira Interior, Covilhã, Portugal.,Unidade de Investigação para o Desenvolvimento do Interior (UDI-IPG), Instituto Politécnico da Guarda, Guarda, Portugal
| | - Diana Costa
- CICS-UBI-Health Sciences Research Centre, Universidade da Beira Interior, Covilhã, Portugal
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Rach H, Kilic-Huck U, Reynaud E, Hugueny L, Peiffer E, Roy de Belleplaine V, Fuchs F, Bourgin P, Geoffroy PA. The melanopsin-mediated pupil response is reduced in idiopathic hypersomnia with long sleep time. Sci Rep 2022; 12:9018. [PMID: 35637236 PMCID: PMC9151765 DOI: 10.1038/s41598-022-13041-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 05/13/2022] [Indexed: 11/09/2022] Open
Abstract
Idiopathic hypersomnia (IH), characterized by an excessive day-time sleepiness, a prolonged total sleep time on 24 h and/or a reduced sleep latency, affects 1 in 2000 individuals from the general population. However, IH remains underdiagnosed and inaccurately treated despite colossal social, professional and personal impacts. The pathogenesis of IH is poorly known, but recent works have suggested possible alterations of phototransduction. In this context, to identify biomarkers of IH, we studied the Post-Illumination Pupil Response (PIPR) using a specific pupillometry protocol reflecting the melanopsin-mediated pupil response in IH patients with prolonged total sleep time (TST > 660 min) and in healthy subjects. Twenty-eight patients with IH (women 86%, 25.4 year-old ± 4.9) and 29 controls (women 52%, 27.1 year-old ± 3.9) were included. After correction on baseline pupil diameter, the PIPR was compared between groups and correlated to sociodemographic and sleep parameters. We found that patients with IH had a lower relative PIPR compared to controls (32.6 ± 9.9% vs 38.5 ± 10.2%, p = 0.037) suggesting a reduced melanopsin response. In addition, the PIPR was not correlated to age, chronotype, TST, nor depressive symptoms. The melanopsin-specific PIPR may be an innovative trait marker of IH and the pupillometry might be a promising tool to better characterize hypersomnia.
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A Growing Link between Circadian Rhythms, Type 2 Diabetes Mellitus and Alzheimer's Disease. Int J Mol Sci 2022; 23:ijms23010504. [PMID: 35008933 PMCID: PMC8745289 DOI: 10.3390/ijms23010504] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 12/29/2021] [Accepted: 12/31/2021] [Indexed: 02/04/2023] Open
Abstract
Type 2 diabetes mellitus (T2DM) patients are at a higher risk of developing Alzheimer’s disease (AD). Mounting evidence suggests the emerging important role of circadian rhythms in many diseases. Circadian rhythm disruption is considered to contribute to both T2DM and AD. Here, we review the relationship among circadian rhythm disruption, T2DM and AD, and suggest that the occurrence and progression of T2DM and AD may in part be associated with circadian disruption. Then, we summarize the promising therapeutic strategies targeting circadian dysfunction for T2DM and AD, including pharmacological treatment such as melatonin, orexin, and circadian molecules, as well as non-pharmacological treatments like light therapy, feeding behavior, and exercise.
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Berger C, Dück A, Gest S, Jonas L, Kölch M, Martin F, Reis O, Schroth J, Legenbauer T, Holtmann M. Possible Effects of Bright Light Therapy on Electroencephalogram-Vigilance in the Treatment of Depression in Adolescents: A Pilot Study. Front Psychiatry 2022; 13:820090. [PMID: 35633803 PMCID: PMC9133446 DOI: 10.3389/fpsyt.2022.820090] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 04/14/2022] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Chronotherapeutic treatments for depression, such as bright light therapy (BLT), are non-invasive and produce almost no side effects. However, study evidence for reliable neurobiological changes associated with treatment response is still rare. Several studies using EEG-vigilance indicate higher arousal and a later decline during resting state in adult depressive patients compared to healthy controls. To our knowledge, there are no study reports on EEG-vigilance in depressive youth to date. METHODS A total of 11 adolescents with depression receiving BLT were compared to 11 age and gender-matched patients with depression receiving treatment as usual (TAU). The BLT was administered in the morning for 2 weeks on five consecutive days per week. The depressive symptomatology was assessed using the Beck Depression Inventory (BDI-II) and the resting state electroencephalogram (EEG) of 20 min was recorded. EEG and BDI-II were assessed before and after 10 days of treatment. Vigilance level and vigilance decline were estimated using the VIGALL toolbox. RESULTS Brain arousal increased after 10 days of bright light therapy in adolescents with depression. Severe depressive symptoms were associated with higher brain arousal levels; the BDI-II sum score correlated negatively with the amount of drowsiness. LIMITATIONS The sample size was small and participants' brain arousal at baseline was not matched and differed between BLT and TAU groups. CONCLUSION The BLT might have an additional effect on brain arousal. EEG-vigilance seems to be a reliable and valid marker for neurobiological changes that are probably associated with depression and its treatment and, therefore, might be of clinical relevance.
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Affiliation(s)
- Christoph Berger
- Department for Child and Adolescent Psychiatry and Neurology, University Medical Centre Rostock, Rostock, Germany
| | - Alexander Dück
- Department for Child and Adolescent Psychiatry and Neurology, University Medical Centre Rostock, Rostock, Germany
| | - Stephanie Gest
- Landschaftsverband Westfalen-Lippe (LWL) University Hospital Hamm for Child and Adolescent Psychiatry, Ruhr University Bochum, Bochum, Germany
| | - Lena Jonas
- Department for Child and Adolescent Psychiatry and Neurology, University Medical Centre Rostock, Rostock, Germany
| | - Michael Kölch
- Department for Child and Adolescent Psychiatry and Neurology, University Medical Centre Rostock, Rostock, Germany
| | - Franziska Martin
- Landschaftsverband Westfalen-Lippe (LWL) University Hospital Hamm for Child and Adolescent Psychiatry, Ruhr University Bochum, Bochum, Germany
| | - Olaf Reis
- Department for Child and Adolescent Psychiatry and Neurology, University Medical Centre Rostock, Rostock, Germany
| | - Jennifer Schroth
- Department for Child and Adolescent Psychiatry and Psychotherapy, Brandenburg Medical School Theodor Fontane, Brandenburg an der Havel, Germany
| | - Tanja Legenbauer
- Landschaftsverband Westfalen-Lippe (LWL) University Hospital Hamm for Child and Adolescent Psychiatry, Ruhr University Bochum, Bochum, Germany
| | - Martin Holtmann
- Landschaftsverband Westfalen-Lippe (LWL) University Hospital Hamm for Child and Adolescent Psychiatry, Ruhr University Bochum, Bochum, Germany
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15
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Youngstedt SD, Elliott J, Patel S, Zi-Ching Mak N, Raiewski E, Malek E, Strong M, Mun CJ, Peters T, Madlol R, Tasevska N, Rasoul M, Nguyen C, Vargas Negrete KM, Adaralegbe AO, Sudalaimuthu S, Granholm D, Finch A, Eksambe A, Malready A, Parthasarathy S. Circadian acclimatization of performance, sleep, and 6-sulfatoxymelatonin using multiple phase shifting stimuli. Front Endocrinol (Lausanne) 2022; 13:964681. [PMID: 36465660 PMCID: PMC9710383 DOI: 10.3389/fendo.2022.964681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 10/03/2022] [Indexed: 11/18/2022] Open
Abstract
Misalignment between the environment and one's circadian system is a common phenomenon (e.g., jet lag) which can have myriad negative effects on physical and mental health, mental and physiological performance, and sleep. Absent any intervention, the circadian system adjusts only 0.5-1.0 h per day to a shifted light-dark and sleep-wake schedule. Bright light facilitates circadian adjustment, but in field studies, bright light is only modestly better than no stimulus. Evidence indicates that exercise and melatonin can be combined with bright light to elicit larger shifts but no study has combined all of these stimuli or administered them at the times that are known to elicit the largest effects on the circadian system. The aims of this study are to compare the effects of different treatments on circadian adjustment to simulated jet lag in a laboratory. Following 2 weeks of home recording, 36 adults will spend 6.5 consecutive days in the laboratory. Following an 8 h period of baseline sleep recording on the participant's usual sleep schedule on Night 1 (e.g., 0000-0800 h), participants will undergo a 26 h circadian assessment protocol involving 2 h wake intervals in dim light and 1 h of sleep in darkness, repeated throughout the 26 h. During this protocol, all urine voidings will be collected; mood, sleepiness, psychomotor vigilance, and pain sensitivity will be assessed every 3 h, forehead temperature will be assessed every 90 min, and anaerobic performance (Wingate test) will be tested every 6 h. Following, the circadian assessment protocol, the participant's sleep-wake and light dark schedule will be delayed by 8 h compared with baseline (e.g., 0800-1400 h), analogous to travelling 8 times zones westward. This shifted schedule will be maintained for 3 days. During the 3 days on the delayed schedule, participants will be randomized to one of 3 treatments: (1) Dim Red Light + Placebo Capsules, (2) Bright Light Alone, (3) Bright Light + Exercise + Melatonin. During the final 26 h, all conditions and measures of the baseline circadian protocol will be repeated. Acclimatization will be defined by shifts in circadian rhythms of aMT6s, psychomotor vigilance, Wingate Anaerobic performance, mood, and sleepiness, and less impairments in these measures during the shifted schedule compared with baseline. We posit that Bright Light Alone and Bright Light + Exercise + Melatonin will elicit greater shifts in circadian rhythms and less impairments in sleep, mood, performance, and sleepiness compared with Dim Red Light + Placebo Capsules. We also posit that Bright Light + Exercise + Melatonin will elicit greater shifts and less impairments than Bright Light Alone.
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Affiliation(s)
- Shawn D. Youngstedt
- Edson College of Nursing and Health Innovation, Arizona State University, Phoenix, AZ, United States
- Department of Medicine, University of Arizona, Tucson, AZ, United States
- *Correspondence: Shawn D. Youngstedt,
| | - Jeffrey Elliott
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, United States
| | - Salma Patel
- Department of Medicine, University of Arizona, Tucson, AZ, United States
| | | | - Evan Raiewski
- Department of Psychology, California State University, San Marcos, CA, United States
| | - Elias Malek
- Department of Kinesiology and Nutrition Sciences, Univeristy of Nevada, Las Vegas, NV, United States
| | - Michael Strong
- Department of Medicine, University of Arizona, Tucson, AZ, United States
| | - Chung Jung Mun
- Edson College of Nursing and Health Innovation, Arizona State University, Phoenix, AZ, United States
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University, Baltimore, MD, United States
| | - Tyler Peters
- Department of Medicine, University of Arizona, Tucson, AZ, United States
| | - Remun Madlol
- Department of Medicine, University of Arizona, Tucson, AZ, United States
| | - Natasha Tasevska
- Edson College of Nursing and Health Innovation, Arizona State University, Phoenix, AZ, United States
| | - Massiullah Rasoul
- Department of Medicine, University of Arizona, Tucson, AZ, United States
| | - Cindy Nguyen
- Department of Medicine, University of Arizona, Tucson, AZ, United States
| | | | | | | | - Delaney Granholm
- Department of Medicine, University of Arizona, Tucson, AZ, United States
| | - Anastasia Finch
- Department of Medicine, University of Arizona, Tucson, AZ, United States
| | - Aryan Eksambe
- Department of Medicine, University of Arizona, Tucson, AZ, United States
| | - Anannya Malready
- Department of Medicine, University of Arizona, Tucson, AZ, United States
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16
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Bean HR, Diggens J, Ftanou M, Alexander M, Stafford L, Bei B, Francis PA, Wiley JF. Light Enhanced Cognitive Behavioral Therapy (CBT-I+Light) for Insomnia and Fatigue During Chemotherapy for Breast Cancer: A Randomized Controlled Trial. Sleep 2021; 45:6383287. [PMID: 34618907 DOI: 10.1093/sleep/zsab246] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 07/21/2021] [Indexed: 11/13/2022] Open
Abstract
STUDY OBJECTIVES Sleep problems are common during chemotherapy for breast cancer (BC). We evaluated whether combined brief cognitive behavioral and bright light therapy (CBT-I+Light) is superior to treatment as usual with relaxation audio (TAU+) for insomnia symptoms and sleep efficiency (primary outcomes). METHODS We randomized women receiving intravenous chemotherapy, stratified by tumor stage and insomnia severity index (ISI), to 6-weeks CBT-I+Light or TAU+. CBT-I+Light included one in-person session, one telephone call, seven emails, and 20 minutes bright light each morning. TAU+ comprised usual treatment and two emails with relaxation audio tracks. Patient-reported outcomes were assessed at baseline, midpoint (week 3), post (week 6) and 3-month follow-up. RESULTS Women (N = 101) were randomly assigned to CBT-I+Light or TAU+. The CBT-I+Light group showed significantly greater improvement in insomnia symptoms than the TAU+ group (-5.06 vs -1.93, P = .009; between-group effect size [ES] = .69). At 3-month follow-up, both groups were lower than baseline but did not differ from each other (between-group ES = .18, P = .56). CBT-I+Light had higher patient-reported sleep efficiency than TAU+ immediately after the start of intervention (P = .05) and significantly greater improvement in fatigue (between-group ES = .59, P = .013) and daytime sleep-related impairment (between-group ES = .61, P = .009) than the TAU+ group. CONCLUSION CBT-I+Light had a clinically significant impact on insomnia and fatigue with moderate effect sizes. Results support offering cognitive behavioral therapy for insomnia and bright light therapy during chemotherapy for breast cancer to help manage sleep and fatigue.
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Affiliation(s)
- Helena R Bean
- School of Psychological Sciences and Turner Institute for Brain and Mental Health, Monash University, Innovation Walk, Melbourne, VIC, Australia
| | | | - Maria Ftanou
- Peter MacCallum Cancer Centre, Melbourne, Australia.,Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia
| | - Marliese Alexander
- Peter MacCallum Cancer Centre, Melbourne, Australia.,Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia
| | - Lesley Stafford
- Centre for Women's Mental Health, Royal Women's Hospital, Melbourne, Australia.,Melbourne School of Psychological Sciences, University of Melbourne, Melbourne, Australia
| | - Bei Bei
- School of Psychological Sciences and Turner Institute for Brain and Mental Health, Monash University, Innovation Walk, Melbourne, VIC, Australia.,Centre for Women's Mental Health, Royal Women's Hospital, Melbourne, Australia.,Melbourne School of Psychological Sciences, University of Melbourne, Melbourne, Australia
| | | | - Joshua F Wiley
- School of Psychological Sciences and Turner Institute for Brain and Mental Health, Monash University, Innovation Walk, Melbourne, VIC, Australia.,Peter MacCallum Cancer Centre, Melbourne, Australia
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Lam C, Chung MH. Dose-response effects of light therapy on sleepiness and circadian phase shift in shift workers: a meta-analysis and moderator analysis. Sci Rep 2021; 11:11976. [PMID: 34099750 PMCID: PMC8184774 DOI: 10.1038/s41598-021-89321-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 04/13/2021] [Indexed: 11/09/2022] Open
Abstract
Light therapy has been considered to be effective in mitigating sleepiness and regulating circadian phase shift in shift workers. However, the effective treatment dose of light therapy remains undetermined. We performed a meta-analysis of randomized experimental studies to determine the effect of light therapy doses on sleepiness and circadian phase shift in shift workers. An article search was performed in 10 electronic databases from inception to June 2020. Two raters independently screened and extracted data and reached consensus. Twenty-one eligible studies were included. Analyses were performed using random-effects models. Light therapy exerted significantly small to medium effects on sleepiness and large treatment effects on circadian phase shift. Moderator analyses performed with subgroup and metaregression analyses revealed that medium-intensity light therapy for a shorter duration more effectively reduced sleepiness at night, whereas higher-intensity light therapy more effectively induced phase shifting, but the required treatment duration remained inconclusive. This study provides evidence regarding the effect of light therapy in reducing sleepiness and shifting circadian phase in shift workers. Exposure to medium-intensity light for a short duration at night reduced sleepiness, whereas exposure to high-intensity light improved sleep by shifting their circadian phase.
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Affiliation(s)
- Calvin Lam
- Department of Psychology, The University of Hong Kong, Pok Fu Lam, Hong Kong
| | - Min-Huey Chung
- School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan. .,Department of Nursing, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan.
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Validity and Usage of the Seasonal Pattern Assessment Questionnaire (SPAQ) in a French Population of Patients with Depression, Bipolar Disorders and Controls. J Clin Med 2021; 10:jcm10091897. [PMID: 33925578 PMCID: PMC8123881 DOI: 10.3390/jcm10091897] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/21/2021] [Accepted: 04/22/2021] [Indexed: 12/04/2022] Open
Abstract
The Seasonal Pattern Assessment Questionnaire (SPAQ), by Rosenthal et al. (1984), is by far the most used questionnaire to evaluate seasonal effects on mood and behavior. It includes a general seasonality score (GSS), composed of 6 items, from which cutoffs have been established to screen for seasonal affective disorder (SAD). However, it has never been validated in French and associations with circadian rhythm and symptoms of depression and bipolarity remain unclear. In this study, including 165 subjects (95 controls and 70 patients with depression or bipolar disorder), we confirmed the validity of the French version of the SPAQ, with a two-factor structure (a psychological factor: energy, mood, social activity and sleep length; and a food factor: weight and appetite) and a good fit was observed by all indicators. Mood and social activity dimensions were significantly affected by seasons in the depressed/bipolar group and a stronger global seasonality score (GSS) was associated with more severe phenotypes of depression and mania. Subjects meeting SAD and subsyndromal-SAD criteria also showed a delayed circadian rhythm compared to controls. Simple tools, such as the SPAQ, can aid the identification of significant seasonal changes and have direct implications on therapeutics including the use of bright light therapy in order to enhance personalized treatments, but also to prevent adverse seasonal effects.
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Geoffroy PA, Palagini L. Biological rhythms and chronotherapeutics in depression. Prog Neuropsychopharmacol Biol Psychiatry 2021; 106:110158. [PMID: 33152388 DOI: 10.1016/j.pnpbp.2020.110158] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 10/14/2020] [Accepted: 10/27/2020] [Indexed: 12/28/2022]
Abstract
Depressive syndromes are frequent and heterogeneous brain conditions with more than 90% of patients suffering from sleep complaints. Better characterizing this "sleep" domain may allow to both better treat acute episodes with existing chronotherapeutics, but also to prevent the manifestation or recurrences of mood disorders. This work aims to i) review theoretical and fundamental data of chronotherapeutics, and ii) provide practical recommendations. Light therapy (LT) can be used as a first-line monotherapy of moderate to severe depression of all subtypes. LT can be also used as a combination with antidepressant to maximize patients' response rates, which has a clear superiority to antidepressant alone. Sleep deprivation (SD) is a rapid and powerful chronotherapeutic with antidepressant responses within hours in 45-60% of patients with unipolar or bipolar depression. Different strategies should be combined to stabilize the SD antidepressant effect, including concomitant medications, repeated SD, combination with sleep phase advance and/or LT (triple chronotherapy). Melatonin treatment is of interest in remitted patients with mood disorder to prevent relapses or recurrences, if a complaint of insomnia, poor sleep quality or phase delay syndrome is associated. During the acute phase, melatonin could be used as an adjuvant treatment for symptoms of insomnia associated with depression. The cognitive behavioral therapy for insomnia (CBT-I) can be recommend to treat insomnia during euthymic phases. The Interpersonal and social rhythm therapy (IPSRT) is indicated for the acute treatment of bipolar depression and for the prevention of mood episodes. Chronotherapeutics should always be associated with behavioral measures for healthy sleep.
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Affiliation(s)
- Pierre A Geoffroy
- Département de psychiatrie et d'addictologie, AP-HP, GHU Paris Nord, DMU Neurosciences, Hopital Bichat - Claude Bernard, F-75018 Paris, France; GHU Paris - Psychiatry & Neurosciences, 1 rue Cabanis, 75014 Paris, France; Université de Paris, NeuroDiderot, Inserm, F-75019 Paris, France.
| | - Laura Palagini
- Department of Clinical and Experimental Medicine, Psychiatric Section, University of Pisa; Azienda Ospedaliera Universitaria Pisana (AUOP), Pisa, Italy
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20
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Beneficial effects of daytime high-intensity light exposure on daily rhythms, metabolic state and affect. Sci Rep 2020; 10:19782. [PMID: 33188227 PMCID: PMC7666121 DOI: 10.1038/s41598-020-76636-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Accepted: 10/27/2020] [Indexed: 12/13/2022] Open
Abstract
While the importance of the circadian system to health and well-being is extensively studied, the role of daylight exposure in these interactions is relatively poorly understood. Here we show, using a diurnal animal model naturally exposed to daylight, that daily morning exposure to 3000 lux, full spectrum electric light has beneficial health effects. Compared with controls, sand rats (Psammomys obesus) subjected to morning light treatment demonstrate daily rhythms with high peak to trough difference in activity, blood glucose levels and per2 gene expression in the suprachiasmatic nucleus, pre-frontal cortex, kidney and liver. The treated animals were also healthier, being normoglycemic, having higher glucose tolerance, lower body and heart weight and lower anxiety- and depression-like behavior. Our results suggest that exposure to high intensity light is important for the proper function of the circadian system and well-being, and are important in face of human's low exposure to daylight and extensive use of artificial light at night.
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