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Chen Y, Deng K, Hughes IM, Smith CE, Meng H, Le MQ, Sun M, Zhang X, Liu D. More than sleep problems? Testing five key health behaviors as reasons for quality of life issues among shift workers. Health Qual Life Outcomes 2024; 22:52. [PMID: 38956578 PMCID: PMC11220953 DOI: 10.1186/s12955-024-02269-4] [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: 07/16/2023] [Accepted: 06/25/2024] [Indexed: 07/04/2024] Open
Abstract
BACKGROUND The shift work schedule is a common work arrangement that can disrupt typical sleep-wake rhythms and lead to negative health consequences. The present study aims to examine the effect of shift work on health-related quality of life (QoL) and explore potential behaviorial mediators (i.e., sleep, eating, exercise, smoking, drinking). METHODS A cross-sectional survey was conducted among 4,449 petroleum workers in southwest China. Data on shift work status, health behaviors, and physical and mental health QoL were collected. We tested our model using path analysis and the Monte Carlo approach among 2,129 included participants. RESULTS After adjusting for covariates, shift work did not exhibit a significant direct association with QoL. However, shift work indirectly related to poorer physical health quality of life via less frequent healthy food consumption; shift work also indirectly related to poorer mental health QoL via both less frequent healthy food consumption and physical exercise. No significant indirect effects were found via sleeping, smoking, or drinking. CONCLUSIONS Results suggest that shift work presents a challenge for QoL among Chinese petroleum workers due to their lesser engagement in two specific health behaviors: healthy eating and physical exercise. Healthy eating and exercise may present an even more prominent threat to shift workers' QoL than sleep and substance use. Strategies targeting shift work schedule as well as eating and exercise behaviors may help protect against poor QoL and adverse physical and mental health outcomes in this vulnerable group.
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Affiliation(s)
- Yuxin Chen
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China
- Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Kaiyi Deng
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Ian M Hughes
- Department of Psychology, North Carolina State University, Raleigh, North Carolina, USA
| | - Claire E Smith
- School of Aging Studies, University of South Florida, Tampa, Florida, USA
| | - Hongdao Meng
- School of Aging Studies, University of South Florida, Tampa, Florida, USA
| | - Minh Quan Le
- School of Aging Studies, University of South Florida, Tampa, Florida, USA
| | - Min Sun
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Xianyan Zhang
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Danping Liu
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China.
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Ryoo SW, Min JY, Son SY, Choi BY, Choi J, Min KB. Telecommuting during the COVID-19: the role of job demand and control on health outcomes. Ann Occup Environ Med 2024; 36:e14. [PMID: 39015559 PMCID: PMC11249703 DOI: 10.35371/aoem.2024.36.e14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 03/07/2024] [Accepted: 04/15/2024] [Indexed: 07/18/2024] Open
Abstract
Background The coronavirus disease 2019 (COVID-19) pandemic drastically modified the occupational system wherein telecommuting has risen as the major form of work. Few studies have incorporated Karasek's job demand-control (JDC) model into explaining the health effects of telecommuting. This study aimed to investigate the health risk in South Korean telecommuters during the pandemic, and its distribution according to the job stress-related factors. Methods A nationwide population-based cross-sectional study of South Korean laborers was conducted, utilizing the 6th Korean Working Conditions Survey (2020-2021). Following the previously described concept of telecommuting, 14,478 white-collar employees were eligible study participants. Telecommuting, job demand, job control, and various health indicators were measured by the responses to the survey. Participants were stratified into 4 job profiles classified by the JDC model. We conducted multiple logistic regression analyses between telecommuting and health-related outcomes to estimate the odds ratio (OR) with a 95% confidence interval (CI). Results One hundred forty-six low-strain, 223 active, 69 passive, and 148 high-strain workers were screened as telecommuters. Compared to office workers, telecommuters had a higher proportion in high job control groups. Subgroup analysis demonstrated different relationships between telecommuting and health, where only active telecommuters showed a higher prevalence of depression (OR: 1.980, 95% CI: 1.126-3.481), and high-strain telecommuters were affected in most outcomes including insomnia (OR: 2.555, 95% CI: 1.473-4.433), musculoskeletal pain (OR: 2.786, 95% CI: 1.719-4.517), headache/eye strain (OR: 3.074, 95% CI: 1.992-4.745) and presenteeism (OR: 1.932, 95% CI: 1.193-3.131). Conclusions This study revealed significantly increased odds of multiple health outcomes among South Korean telecommuters during the COVID-19 pandemic era. High-strain job holders were prominently susceptible to the negative health impacts of telecommuting. Occupational health management towards telecommuters should approach mitigating high job demand and low job control.
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Affiliation(s)
- Seung-Woo Ryoo
- Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul, Korea
| | - Jin-Young Min
- Veterans Medical Research Institute, Veterans Health Service Medical Center, Seoul, Korea
| | - Seok-Yoon Son
- Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul, Korea
| | - Baek-Yong Choi
- Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul, Korea
| | - Juho Choi
- Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul, Korea
| | - Kyoung-Bok Min
- Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul, Korea
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3
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Erren TC, Morfeld P. Circadian epidemiology: Structuring circadian causes of disease and practical implications. Chronobiol Int 2024; 41:38-52. [PMID: 38047448 DOI: 10.1080/07420528.2023.2288219] [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: 04/27/2023] [Accepted: 11/22/2023] [Indexed: 12/05/2023]
Abstract
That disruptions of the body's internal clockwork can lead to negative health consequences, including cancer, is a plausible hypothesis. Yet, despite strong mechanistic and animal support, the International Agency for Research on Cancer (IARC) experts considered epidemiological evidence as limited regarding the carcinogenicity of "shift-work involving circadian disruption" (2007) and "night shift work" (2019). We use directed acyclic graphs (DAGs) to outline a concept of circadian causes that discloses challenges when choosing appropriate exposure variables. On this basis, we propose to move beyond shift-work alone as a direct cause of disease. Instead, quantifying chronodisruption as individual doses can lead to interpretable circadian epidemiology. The hypothesis is that doses of chronodisruption cause disrupted circadian organisation by leading to desynchronization of circadian rhythms. Chronodisruption can be conceptualized as the split physiological nexus of internal and external times. Biological (or internal) night - an individual's intrinsically favoured sleep time window - could be the backbone of circadian epidemiology. In practice, individual doses that cause disrupted circadian organisation are derived from the intersection of time intervals of being awake and an individual's biological night. After numerous studies counted work shifts, chronobiology may now advance circadian epidemiology with more specific dose estimation - albeit with greater challenges in measurement (time-dependent individual data) and analysis (time-dependent confounding).
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Affiliation(s)
- Thomas C Erren
- Institute and Policlinic for Occupational Medicine, Environmental Medicine and Prevention Research, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Köln, Germany
| | - Peter Morfeld
- Institute and Policlinic for Occupational Medicine, Environmental Medicine and Prevention Research, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Köln, Germany
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Olsen CM, Glaeser BL, Szabo A, Raff H, Everson CA. The effects of sleep restriction during abstinence on oxycodone seeking: Sex-dependent moderating effects of behavioral and hypothalamic-pituitary-adrenal axis-related phenotypes. Physiol Behav 2023; 272:114372. [PMID: 37805135 PMCID: PMC10841994 DOI: 10.1016/j.physbeh.2023.114372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 09/11/2023] [Accepted: 10/04/2023] [Indexed: 10/09/2023]
Abstract
During opioid use and abstinence, sleep disturbances are common and are thought to exacerbate drug craving. In this study, we tested the hypothesis that sleep restriction during abstinence from oxycodone self-administration would increase drug seeking during extinction and footshock reinstatement tests. We also performed behavioral phenotyping to determine if individual variation in responses to stressors and/or pain are associated with oxycodone seeking during abstinence, as stress, pain and sleep disturbance are often co-occurring phenomena. Sleep restriction during abstinence did not have selective effects on oxycodone seeking for either sex in extinction and footshock reinstatement tests. Some phenotypes were associated with drug seeking; these associations differed by sex and type of drug seeking assessment. In female rats, pain-related phenotypes were related to high levels of drug seeking during the initial extinction session. In male rats, lower anxiety-like behavior in the open field was associated with greater drug seeking, although this effect was lost when correcting for oxycodone intake. Adrenal sensitivity prior to oxycodone exposure was positively associated with footshock reinstatement in females. This work identifies sex-dependent relationships between HPA axis function and opioid seeking, indicating that HPA axis function could be a therapeutic target for the treatment of opioid use disorder, with tailored approaches based on sex. Sleep disturbance during abstinence did not appear to be a major contributing factor to opioid seeking.
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Affiliation(s)
- Christopher M Olsen
- Departments of Pharmacology & Toxicology and Neurosurgery, Neuroscience Research Center, Medical College of Wisconsin, 8701 Watertown Plank, Milwaukee, WI 53226, USA.
| | - Breanna L Glaeser
- Department of Pharmacology & Toxicology and Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Aniko Szabo
- Division of Biostatistics, Institute for Health & Equity, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Hershel Raff
- Department of Medicine (Endocrinology and Molecular Medicine), Surgery, and Physiology, Medical College of Wisconsin, Milwaukee, WI, USA; Endocrine Research Laboratory, Aurora St. Luke's Medical Center, Advocate Aurora Research Institute, Milwaukee, WI, USA
| | - Carol A Everson
- Department of Medicine (Endocrinology and Molecular Medicine) and Cell Biology, Neurobiology & Anatomy, Medical College of Wisconsin, Milwaukee, WI, USA
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Toffoli B, Tonon F, Giudici F, Ferretti T, Ghirigato E, Contessa M, Francica M, Candido R, Puato M, Grillo A, Fabris B, Bernardi S. Preliminary Study on the Effect of a Night Shift on Blood Pressure and Clock Gene Expression. Int J Mol Sci 2023; 24:ijms24119309. [PMID: 37298261 DOI: 10.3390/ijms24119309] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 05/19/2023] [Accepted: 05/24/2023] [Indexed: 06/12/2023] Open
Abstract
Night shift work has been found to be associated with a higher risk of cardiovascular and cerebrovascular disease. One of the underlying mechanisms seems to be that shift work promotes hypertension, but results have been variable. This cross-sectional study was carried out in a group of internists with the aim of performing a paired analysis of 24 h blood pressure in the same physicians working a day shift and then a night shift, and a paired analysis of clock gene expression after a night of rest and a night of work. Each participant wore an ambulatory blood pressure monitor (ABPM) twice. The first time was for a 24 h period that included a 12 h day shift (08.00-20.00) and a night of rest. The second time was for a 30 h period that included a day of rest, a night shift (20.00-08.00), and a subsequent period of rest (08.00-14.00). Subjects underwent fasting blood sampling twice: after the night of rest and after the night shift. Night shift work significantly increased night systolic blood pressure (SBP), night diastolic blood pressure (DBP), and heart rate (HR) and decreased their respective nocturnal decline. Clock gene expression increased after the night shift. There was a direct association between night blood pressure and clock gene expression. Night shifts lead to an increase in blood pressure, non-dipping status, and circadian rhythm misalignment. Blood pressure is associated with clock genes and circadian rhythm misalignement.
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Affiliation(s)
- Barbara Toffoli
- Department of Medical Surgical and Health Sciences, University of Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
| | - Federica Tonon
- Department of Medical Surgical and Health Sciences, University of Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
| | - Fabiola Giudici
- Department of Medical Surgical and Health Sciences, University of Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
| | - Tommaso Ferretti
- Department of Medical Surgical and Health Sciences, University of Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
| | - Elena Ghirigato
- Department of Medical Surgical and Health Sciences, University of Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
| | - Matilde Contessa
- Department of Medical Surgical and Health Sciences, University of Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
| | - Morena Francica
- Department of Medical Surgical and Health Sciences, University of Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
| | - Riccardo Candido
- Department of Medical Surgical and Health Sciences, University of Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
- SC Patologie Diabetiche, ASUGI, 34100 Trieste, Italy
| | - Massimo Puato
- SSD Angiologia e Fisiologia Clinica Vascolare Multidisciplinare Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
| | - Andrea Grillo
- Department of Medical Surgical and Health Sciences, University of Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
- UCO Medicina Clinica, ASUGI Azienda Sanitaria Universitaria Giuliano-Isontina, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
| | - Bruno Fabris
- Department of Medical Surgical and Health Sciences, University of Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
- UCO Medicina Clinica, ASUGI Azienda Sanitaria Universitaria Giuliano-Isontina, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
| | - Stella Bernardi
- Department of Medical Surgical and Health Sciences, University of Trieste, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
- UCO Medicina Clinica, ASUGI Azienda Sanitaria Universitaria Giuliano-Isontina, Cattinara Teaching Hospital, Strada di Fiume 447, 34149 Trieste, Italy
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Burns AC, Phillips AJK, Rutter MK, Saxena R, Cain SW, Lane JM. Genome-wide gene by environment study of time spent in daylight and chronotype identifies emerging genetic architecture underlying light sensitivity. Sleep 2023; 46:zsac287. [PMID: 36519390 PMCID: PMC9995784 DOI: 10.1093/sleep/zsac287] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 09/14/2022] [Indexed: 12/23/2022] Open
Abstract
STUDY OBJECTIVES Light is the primary stimulus for synchronizing the circadian clock in humans. There are very large interindividual differences in the sensitivity of the circadian clock to light. Little is currently known about the genetic basis for these interindividual differences. METHODS We performed a genome-wide gene-by-environment interaction study (GWIS) in 280 897 individuals from the UK Biobank cohort to identify genetic variants that moderate the effect of daytime light exposure on chronotype (individual time of day preference), acting as "light sensitivity" variants for the impact of daylight on the circadian system. RESULTS We identified a genome-wide significant SNP mapped to the ARL14EP gene (rs3847634; p < 5 × 10-8), where additional minor alleles were found to enhance the morningness effect of daytime light exposure (βGxE = -.03, SE = 0.005) and were associated with increased gene ARL14EP expression in brain and retinal tissues. Gene-property analysis showed light sensitivity loci were enriched for genes in the G protein-coupled glutamate receptor signaling pathway and genes expressed in Per2+ hypothalamic neurons. Linkage disequilibrium score regression identified Bonferroni significant genetic correlations of greater light sensitivity GWIS with later chronotype and shorter sleep duration. Greater light sensitivity was nominally genetically correlated with insomnia symptoms and risk for post-traumatic stress disorder (PTSD). CONCLUSIONS This study is the first to assess light as an important exposure in the genomics of chronotype and is a critical first step in uncovering the genetic architecture of human circadian light sensitivity and its links to sleep and mental health.
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Affiliation(s)
- Angus C Burns
- Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Melbourne, Victoria, Australia
- Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA, 02114, USA
- Broad Institute, Cambridge, MA, USA
| | - Andrew J K Phillips
- Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Melbourne, Victoria, Australia
| | - Martin K Rutter
- Division of Endocrinology, Diabetes & Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
- Diabetes, Endocrinology and Metabolism Centre, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - Richa Saxena
- Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA, 02114, USA
- Broad Institute, Cambridge, MA, USA
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, 02114, USA
| | - Sean W Cain
- Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Melbourne, Victoria, Australia
| | - Jacqueline M Lane
- Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA, 02114, USA
- Broad Institute, Cambridge, MA, USA
- Division of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Boston, MA, 02115, USA
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Huang G, Lee TY, Banda KJ, Pien LC, Jen HJ, Chen R, Liu D, Hsiao STS, Chou KR. Prevalence of sleep disorders among first responders for medical emergencies: A meta-analysis. J Glob Health 2022; 12:04092. [PMID: 36269052 PMCID: PMC9585923 DOI: 10.7189/jogh.12.04092] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Background Shift work and irregular work schedules among first responders have been associated with physical and psychological problems such as sleep disorders. We conducted the first meta-analysis to explore and estimate the prevalence of sleep disorders among first responders for medical emergencies. Methods We searched four databases: Web of Science, Psych Info, CINAHL, and PubMed. The Generalized Linear Mixed model (GLMM) was used to estimate the prevalence estimates of sleep disorders in R software and the DerSimonian-Lard random-effects model in Comprehensive Meta-Analysis was used to explore associated comorbidities for OSA and insomnia, presented as odds ratios (ORs) and confidence intervals (CIs). The Cochran's Q, τ2, and the statistics were used to assess heterogeneity and the moderator analysis was conducted to identify moderator variables. Results Twenty-eight studies with 100 080 first responders were included from the total of 1119 studies retrieved from the databases. The prevalence rates for sleep disorders were 31% (95% CI = 15%-53%) for shift work disorder (SWD), 30% (95% CI = 18%-46%) for obstructive sleep apnea (OSA), 28% (95% CI = 19%-39%) for insomnia, 28% (95% CI = 24%-33%) for excessive daytime sleepiness (EDS), 2% (95% CI = 1%-4%) for restless leg syndrome, and 1% (95% CI = 0%-5%) for narcolepsy. Anxiety (OR = 2.46; 95% CI = 1.99%-3.03%), cardiovascular disease (CVD) (OR = 2.03; 95% CI = 1.43-2.88), diabetes mellitus (DM) (OR = 1.93; 95% CI = 1.41-2.65), depression (OR = 1.89; 95% CI = 1.01-3.56), gastroesophageal reflux disease (GERD) (OR = 1.83; 95% CI = 150-2.22), and post-traumatic stress disorder (PTSD) (OR = 1.78; 95% CI = 1.33-2.39) were associated with OSA. Depression (OR = 9.74; 95% CI = 4.67-20.3), anxiety (OR = 9.22; 95% CI = 3.81-22.3), and PTSD (OR = 7.13; 95% CI = 6.27-8.10) were associated with insomnia. Age, gender, first responders, continent, study quality, study design, and assessment tool were significant moderator variables for OSA, insomnia, and EDS. Conclusions This meta-analysis found a substantially high prevalence of sleep disorders including SWD, OSA, insomnia, and EDS among first responders for medical emergencies. Early assessment and management of sleep disorders among first responders is necessary to promote good, quality sleep to help prevent anxiety, depression, CVD, DM, GERD, and PTSD.
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Affiliation(s)
- Garry Huang
- School of Health Care Administration, College of Management, Taipei Medical University, Taipei, Taiwan.,Australasian College of Paramedicine, Australia.,Australian Institute of Project Management, Australia
| | - Tso-Ying Lee
- Nursing Research Center, Department of Nursing, Taipei Medical University Hospital, Taipei, Taiwan
| | - Kondwani Joseph Banda
- School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.,Endoscopy Unit, Surgery Department, Kamuzu Central Hospital, Lilongwe, Malawi
| | - Li-Chung Pien
- Post-Baccalaureate Program in Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.,Psychiatric Research Center, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Hsiu-Ju Jen
- School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.,Department of Nursing, Taipei Medical University-Shuang Ho Hospital, New Taipei, Taiwan
| | - Ruey Chen
- School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.,Post-Baccalaureate Program in Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.,Department of Nursing, Taipei Medical University-Shuang Ho Hospital, New Taipei, Taiwan
| | - Doresses Liu
- School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.,Department of Nursing, Wan Fang Hospital, Taipei Medical University.,Center for Nursing and Healthcare Research in Clinical Practice Application, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Shu-Tai Shen Hsiao
- School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.,Superintendent Office, Taipei Medical University Hospital, Taipei, Taiwan
| | - Kuei-Ru Chou
- School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.,Department of Nursing, Taipei Medical University-Shuang Ho Hospital, New Taipei, Taiwan.,Center for Nursing and Healthcare Research in Clinical Practice Application, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.,Psychiatric Research Center, Taipei Medical University Hospital, Taipei, Taiwan.,Neuroscience Research Center, Taipei Medical University, Taipei, Taiwan
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Drapkina OM, Kontsevaya AV, Kalinina AM, Avdeev SM, Agaltsov MV, Alexandrova LM, Antsiferova AA, Aronov DM, Akhmedzhanov NM, Balanova YA, Balakhonova TV, Berns SA, Bochkarev MV, Bochkareva EV, Bubnova MV, Budnevsky AV, Gambaryan MG, Gorbunov VM, Gorny BE, Gorshkov AY, Gumanova NG, Dadaeva VA, Drozdova LY, Egorov VA, Eliashevich SO, Ershova AI, Ivanova ES, Imaeva AE, Ipatov PV, Kaprin AD, Karamnova NS, Kobalava ZD, Konradi AO, Kopylova OV, Korostovtseva LS, Kotova MB, Kulikova MS, Lavrenova EA, Lischenko OV, Lopatina MV, Lukina YV, Lukyanov MM, Mayev IV, Mamedov MN, Markelova SV, Martsevich SY, Metelskaya VA, Meshkov AN, Milushkina OY, Mukaneeva DK, Myrzamatova AO, Nebieridze DV, Orlov DO, Poddubskaya EA, Popovich MV, Popovkina OE, Potievskaya VI, Prozorova GG, Rakovskaya YS, Rotar OP, Rybakov IA, Sviryaev YV, Skripnikova IA, Skoblina NA, Smirnova MI, Starinsky VV, Tolpygina SN, Usova EV, Khailova ZV, Shalnova SA, Shepel RN, Shishkova VN, Yavelov IS. 2022 Prevention of chronic non-communicable diseases in Of the Russian Federation. National guidelines. КАРДИОВАСКУЛЯРНАЯ ТЕРАПИЯ И ПРОФИЛАКТИКА 2022. [DOI: 10.15829/1728-8800-2022-3235] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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9
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McEwen BS, Karatsoreos IN. Sleep Deprivation and Circadian Disruption Stress, Allostasis, and Allostatic Load. Sleep Med Clin 2022; 17:253-262. [DOI: 10.1016/j.jsmc.2022.03.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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10
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Lee WT, Lim SS, Yoon JH, Won JU. Association between Changes in the Regularity of Working Hours and Cognitive Impairment in Middle-Aged and Older Korean Workers: The Korean Longitudinal Study of Aging, 2008-2018. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19074161. [PMID: 35409846 PMCID: PMC8998999 DOI: 10.3390/ijerph19074161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 03/25/2022] [Accepted: 03/29/2022] [Indexed: 02/01/2023]
Abstract
Changes in the regularity of working hours affect the cognitive function of middle-aged workers. This study investigated the association between alterations in the regularity of working hours and cognitive impairment in middle-aged and elderly Korean workers. The data from the Korean Longitudinal Study of Aging were analyzed and cognitive function was evaluated using the Korean version of the mini−mental state examination. A score of <23 points was defined as cognitive impairment. The effect of changes in the regularity of working hours on cognitive impairment development was assessed using the generalized estimating equation model. Compared with regular working hours group, the odds ratios (ORs; 95% confidence interval) of the “consistently irregular”, “regular to irregular”, and “irregular to regular” groups were 1.56 (1.30−1.88), 1.46 (1.20−1.77), and 1.24 (1.01−1.53), respectively. The risk of cognitive deterioration was found in the “consistently irregular” group. However, only workers with normal working hours in the “regular to irregular” group had a significant risk of cognitive deterioration (1.51 (1.21−1.89)). Altered working hours were associated with cognitive impairment in middle-aged and older workers. The study emphasizes the need to implement a standard work schedule that is suitable for middle-aged workers.
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Affiliation(s)
- Won-Tae Lee
- Department of Occupational and Environmental Medicine, Severance Hospital, College of Medicine, Yonsei University, Seoul 03722, Korea; (W.-T.L.); (S.-S.L.)
- The Institute for Occupational Health, College of Medicine, Yonsei University, Seoul 03722, Korea;
- Department of Public Health, Graduate School, Yonsei University, Seoul 03722, Korea
| | - Sung-Shil Lim
- Department of Occupational and Environmental Medicine, Severance Hospital, College of Medicine, Yonsei University, Seoul 03722, Korea; (W.-T.L.); (S.-S.L.)
- The Institute for Occupational Health, College of Medicine, Yonsei University, Seoul 03722, Korea;
| | - Jin-Ha Yoon
- The Institute for Occupational Health, College of Medicine, Yonsei University, Seoul 03722, Korea;
- Department of Public Health, Graduate School, Yonsei University, Seoul 03722, Korea
- Department of Preventive Medicine, College of Medicine, Yonsei University, Seoul 03722, Korea
| | - Jong-Uk Won
- Department of Occupational and Environmental Medicine, Severance Hospital, College of Medicine, Yonsei University, Seoul 03722, Korea; (W.-T.L.); (S.-S.L.)
- The Institute for Occupational Health, College of Medicine, Yonsei University, Seoul 03722, Korea;
- Department of Public Health, Graduate School, Yonsei University, Seoul 03722, Korea
- Correspondence: ; Tel.: +82-2-2228-1579
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Molzof HE, Peterson CM, Thomas SJ, Gloston GF, Johnson RL, Gamble KL. Nightshift Work and Nighttime Eating Are Associated With Higher Insulin and Leptin Levels in Hospital Nurses. Front Endocrinol (Lausanne) 2022; 13:876752. [PMID: 35615722 PMCID: PMC9124849 DOI: 10.3389/fendo.2022.876752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 03/29/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Circadian misalignment between behaviors such as feeding and endogenous circadian rhythms, particularly in the context of shiftwork, is associated with poorer cardiometabolic health. We examined whether insulin and leptin levels differ between dayshift versus nightshift nurses, as well as explored whether the timing of food intake modulates these effects in nightshift workers. METHODS Female nurses (N=18; 8 dayshift and 10 nightshift) completed daily diet records for 8 consecutive days. The nurses then completed a 24-h inpatient stay, during which blood specimens were collected every 3 h (beginning at 09:00) and meals were consumed at regular 3-h intervals (09:00, 12:00, 15:00, and 18:00). Specimens were analyzed for insulin and leptin levels, and generalized additive models were used to examine differences in mean insulin and leptin levels. RESULTS Mean insulin and leptin levels were higher in nightshift nurses by 11.6 ± 3.8 mU/L (p=0.003) and 7.4 ± 3.4 ng/ml (p=0.03), respectively, compared to dayshift nurses. In an exploratory subgroup analysis of nightshift nurses, predominately eating at night (21:00 - 06:00) was associated with significantly higher insulin and leptin levels than consuming most calories during the daytime (06:00 - 21:00). CONCLUSIONS In our study of hospital nurses, working the nightshift was associated with higher insulin and leptin levels, and these effects were driven by eating predominately at night. We conclude that although nightshift work may raise insulin and leptin levels, eating during the daytime may attenuate some of the negative effects of nightshift work on metabolic health.
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Affiliation(s)
- Hylton E. Molzof
- Department of Psychiatry and Behavioral Sciences, Division of Sleep Medicine, Stanford University, Stanford, CA, United States
| | - Courtney M. Peterson
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL, United States
| | - S. Justin Thomas
- Department of Psychiatry and Behavioral Neurobiology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Gabrielle F. Gloston
- Department of Psychiatry and Behavioral Neurobiology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Russell L. Johnson
- Department of Psychiatry and Behavioral Neurobiology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Karen L. Gamble
- Department of Psychiatry and Behavioral Neurobiology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- *Correspondence: Karen L. Gamble,
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12
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Long-term variable photoperiod exposure impairs the mPFC and induces anxiety and depression-like behavior in male wistar rats. Exp Neurol 2021; 347:113908. [PMID: 34710402 DOI: 10.1016/j.expneurol.2021.113908] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 10/07/2021] [Accepted: 10/23/2021] [Indexed: 01/15/2023]
Abstract
Long-term shift work can cause circadian misalignment, which has been linked to anxiety and depression. However, the associated pathophysiologic changes have not been described in detail, and the mechanism underlying this association is not fully understood. To address these points, we used a rat model of CM induced by long-term variable photoperiod exposure [L-VP] (ie, for 90 days). We compared the numbers of neurons, astrocytes, and dendritic spines; dendrite morphology; long-term potentiation (LTP), long-term depression (LTD) and paired-pulse ratio (PPR); expression of glutamate receptor [N-methyl-d-aspartate receptor (NMDAR) and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR)] subunits and brain-derived neurotrophic factor (BDNF) in the medial prefrontal cortex (mPFC); and the anxiety and depression behaviors between rats in the circadian misalignment (CM) and circadian alignment (CA, with normal circadian rhythm) groups. The results showed that L-VP reduced the number of neurons and astrocytes in the mPFC and decreased the number of dendritic spines, dendrite complexity, LTP, LTD, PPR, and expression of glutamate receptors (GluR1, GluR2, GluR3, NMDAR2A, and NMDAR2B) and BDNF in the mPFC. L-VP also induced anxiety and depression-like behaviors, as measured by the open field test, elevated plus-maze, sucrose preference test, and forced swim test. These results suggest that CM induces a loss of neurons and astrocytes and synaptic damage in surviving pyramidal cells in the mPFC might be involved in the pathophysiology of anxiety and depression.
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13
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Patterson PD, Weiss LS, Weaver MD, Salcido DD, Opitz SE, Okerman TS, Smida TT, Martin SE, Guyette FX, Martin-Gill C, Callaway CW. Napping on the night shift and its impact on blood pressure and heart rate variability among emergency medical services workers: study protocol for a randomized crossover trial. Trials 2021; 22:212. [PMID: 33726840 PMCID: PMC7962082 DOI: 10.1186/s13063-021-05161-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 02/27/2021] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND There is an emerging body of evidence that links exposure to shift work to cardiovascular disease (CVD). The risk of coronary events, such as myocardial infarction, is greater among night shift workers compared to day workers. There is reason to believe that repeated exposure to shift work, especially night shift work, creates alterations in normal circadian patterns of blood pressure (BP) and heart rate variability (HRV) and that these alterations contribute to increased risk of CVD. Recent data suggest that allowing shift workers to nap during night shifts may help to normalize BP and HRV patterns and, over time, reduce the risk of CVD. The risk of CVD related to shift work is elevated for emergency medical services (EMS) shift workers due in part to long-duration shifts, frequent use of night shifts, and a high prevalence of multiple jobs. METHODS We will use a randomized crossover trial study design with three study conditions. The targeted population is comprised of EMS clinician shift workers, and our goal enrollment is 35 total participants with an estimated 10 of the 35 enrolled not completing the study protocol or classified as lost to attrition. All three conditions will involve continuous monitoring over 72 h and will begin with a 36-h at-home period, followed by 24 total hours in the lab (including a 12-h simulated night shift), ending with 12 h at home. The key difference between the three conditions is the intra-shift nap. Condition 1 will involve a simulated 12-h night shift with total sleep deprivation. Condition 2 will involve a simulated 12-h night shift and a 30-min nap opportunity. Condition 3 will involve a simulated 12-h night shift with a 2-h nap opportunity. Our primary outcomes of interest include blunted BP dipping and reduced HRV as measured by the standard deviation of the inter-beat intervals of normal sinus beats. Non-dipping status will be defined as sleep hours BP dip of less than 10%. DISCUSSION Our study will address two indicators of cardiovascular health and determine if shorter or longer duration naps during night shifts have a clinically meaningful impact. TRIAL REGISTRATION ClinicalTrials.gov NCT04469803 . Registered on 9 July 2020.
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Affiliation(s)
- P. Daniel Patterson
- Department of Emergency Medicine, University of Pittsburgh, School of Medicine, 3600 Forbes Ave., Iroquois Building, Suite 400A, Pittsburgh, PA 15261 USA
- Division of Community Health Services, Emergency Medicine Program, University of Pittsburgh, School of Health and Rehabilitation Sciences, Pittsburgh, PA 15261 USA
| | - Leonard S. Weiss
- Department of Emergency Medicine, University of Pittsburgh, School of Medicine, 3600 Forbes Ave., Iroquois Building, Suite 400A, Pittsburgh, PA 15261 USA
| | - Matthew D. Weaver
- Division of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Boston, MA 02115 USA
- Harvard Medical School, Division of Sleep Medicine, Boston, MA 02115 USA
| | - David D. Salcido
- Department of Emergency Medicine, University of Pittsburgh, School of Medicine, 3600 Forbes Ave., Iroquois Building, Suite 400A, Pittsburgh, PA 15261 USA
| | - Samantha E. Opitz
- Department of Emergency Medicine, University of Pittsburgh, School of Medicine, 3600 Forbes Ave., Iroquois Building, Suite 400A, Pittsburgh, PA 15261 USA
| | - Tiffany S. Okerman
- Department of Emergency Medicine, University of Pittsburgh, School of Medicine, 3600 Forbes Ave., Iroquois Building, Suite 400A, Pittsburgh, PA 15261 USA
- Division of Community Health Services, Emergency Medicine Program, University of Pittsburgh, School of Health and Rehabilitation Sciences, Pittsburgh, PA 15261 USA
| | - Tanner T. Smida
- Department of Emergency Medicine, University of Pittsburgh, School of Medicine, 3600 Forbes Ave., Iroquois Building, Suite 400A, Pittsburgh, PA 15261 USA
| | - Sarah E. Martin
- Department of Emergency Medicine, University of Pittsburgh, School of Medicine, 3600 Forbes Ave., Iroquois Building, Suite 400A, Pittsburgh, PA 15261 USA
| | - Francis X. Guyette
- Department of Emergency Medicine, University of Pittsburgh, School of Medicine, 3600 Forbes Ave., Iroquois Building, Suite 400A, Pittsburgh, PA 15261 USA
| | - Christian Martin-Gill
- Department of Emergency Medicine, University of Pittsburgh, School of Medicine, 3600 Forbes Ave., Iroquois Building, Suite 400A, Pittsburgh, PA 15261 USA
| | - Clifton W. Callaway
- Department of Emergency Medicine, University of Pittsburgh, School of Medicine, 3600 Forbes Ave., Iroquois Building, Suite 400A, Pittsburgh, PA 15261 USA
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14
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Martin JS, Laberge L, Sasseville A, Bérubé M, Alain S, Lavoie J, Houle J, Hébert M. Timely use of in-car dim blue light and blue blockers in the morning does not improve circadian adaptation of fast rotating shift workers. Chronobiol Int 2021; 38:705-719. [PMID: 33588653 DOI: 10.1080/07420528.2021.1872592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Circadian adaptation to night work usually does not occur in naturalistic conditions, largely due to exposure to low levels of light during the night and light in the morning on the way home. This leads to circadian misalignment, which has documented deleterious effects on sleep and functioning during waking hours. Chronic circadian misalignment is also being increasingly associated with long-term health comorbidities. As the circadian system is mostly sensitive to short wavelengths (i.e., blue light) and less sensitive to long wavelengths (i.e., red light), shaping light exposure in a "wavelength-wise" manner has been proposed to promote partial adaptation to night shifts, and, therefore, alleviate circadian rhythms disruption. This report presents results from two cross-over designed studies that aimed to investigate the effects of three different light conditions on circadian phase, sleepiness, and alertness of police patrol officers on a rotating shift schedule. The first study took place during summer (n = 15) and the second study (n = 25) during winter/early spring. In both studies, all participants went through three conditions composed of four consecutive night shifts: 1) in-car dim blue light exposure during the night shift and wearing of blue-blocking glasses (BBG) in the morning after 05:00 h; 2) in-car red light exposure during the night shift and wearing of BBG in the morning after 05:00 h; 3) a control condition with no intervention. To assess circadian phase position, salivary melatonin was collected hourly the night before and the night after each condition. Sleep was monitored by wrist actigraphy. Also, a 10-min Psychomotor Vigilance-Task was administered at the beginning and end of each night shift and the Karolinska Sleepiness Scale was completed every 2 h during each night shift. In the summer study, no difference was found in alertness and sleepiness between conditions. Participants though exhibited greater (≈3 h) phase delay after four consecutive night shifts in the control condition (in which morning light exposure was expected to prevent phase delay) than after the blue and red conditions (≈2 h) (in which wearing BBG were expected to promote phase delay). In the second study performed during the winter/early spring, a comparable ≈2 h phase delay was found in each of the three conditions, with no difference in alertness and sleepiness between conditions. In conclusion, participants in both studies exhibited modest phase delay across the four night shifts, even during the control conditions. Still, re-entrainment was not fast enough to produce partial circadian adaptation after four night shifts. A greater number of consecutive night shifts may be necessary to produce enough circadian alignment to elicit benefits on sleepiness and alertness in workers driving a motorized vehicle during night shifts. In-car dim blue light exposure combined with the wearing of BBG in the morning did not show the expected benefits on circadian adaptation, sleepiness, and alertness in our studies. Higher levels of light may be warranted when implementing light intervention in a motorized vehicle setting.
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Affiliation(s)
| | - Luc Laberge
- ÉCOBES - Recherche et Transfert, Cégep de Jonquière, Saguenay, Québec, Canada.,Département des Sciences de la Santé, Université du Québec à Chicoutimi, Saguenay, Québec, Canada.,Département d'ophtalmologie et ORL-chirurgie Cervico-faciale, Université Laval, Québec, Québec, Canada
| | | | - Marilie Bérubé
- CERVO Brain Research Centre, Université Laval, Québec, Québec, Canada
| | - Samuel Alain
- CERVO Brain Research Centre, Université Laval, Québec, Québec, Canada
| | - Joëlle Lavoie
- CERVO Brain Research Centre, Université Laval, Québec, Québec, Canada
| | - Jérôme Houle
- CERVO Brain Research Centre, Université Laval, Québec, Québec, Canada
| | - Marc Hébert
- CERVO Brain Research Centre, Université Laval, Québec, Québec, Canada.,Département d'ophtalmologie et ORL-chirurgie Cervico-faciale, Université Laval, Québec, Québec, Canada
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15
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Effects of sleep deprivation on endothelial function in adult humans: a systematic review. GeroScience 2021; 43:137-158. [PMID: 33558966 DOI: 10.1007/s11357-020-00312-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 12/06/2020] [Indexed: 01/01/2023] Open
Abstract
Sleep deprivation is highly prevalent and is associated with increased cardiovascular disease (CVD) morbidity and mortality. Age-related alterations in sleep and chronobiology may exaggerate CVD susceptibility in older individuals. The mechanisms responsible for the association between sleep deprivation and CVD are not fully understood, but endothelial dysfunction may play a central role. Our objective was to conduct a systematic literature review to evaluate the evidence on the effects of sleep deprivation on endothelial function (EF). This review adhered to the PRISMA guidelines and was pre-registered with PROSPERO (#CRD42020192485, 07/24/2020). We searched PubMed, Web of Science, Embase, and Cochrane Library for articles published through May 1, 2020. Eligibility criteria included publication in English and use of well-established EF methodologies in adult humans. Two investigators independently performed the literature search, study selection, data extraction, risk-of-bias assessment, and qualitative data synthesis. Out of 3571 articles identified, 24 articles were included in the systematic review. Main findings include the following: (1) shorter sleep duration is associated with lower macrovascular EF; (2) not sleeping 7-9 h/night is linked with impaired microvascular EF; (3) sleep restriction impairs micro- and macrovascular EF; (4) acute total sleep deprivation impairs micro- and macrovascular EF but data on macrovascular EF are less consistent; and (5) shift work impairs macrovascular EF. In conclusion, sleep deprivation impairs EF, which may explain the link between insufficient sleep and CVD. Future investigations should fully elucidate the underlying mechanisms and develop strategies to combat the adverse endothelial effects of sleep deprivation across the lifespan.
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16
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Yun S, Kim M, Lee WT, Yoon JH, Won JU. Irregular Work Hours and the Risk of Sleep Disturbance Among Korean Service Workers Required to Suppress Emotion. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18041517. [PMID: 33562866 PMCID: PMC7915650 DOI: 10.3390/ijerph18041517] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 02/02/2021] [Accepted: 02/02/2021] [Indexed: 12/11/2022]
Abstract
Although a necessity in a modern society, irregular work schedule can lead to sleep problems. We investigated the effect of work schedule irregularity on sleep disturbance of 17,846 Korean service workers using the fifth Korean Working Conditions Survey. The odds ratio (OR) and 95% confidence interval (CI) for sleep disturbance occurrence were calculated through a multiple logistic regression model. The adjusted ORs for moderate and severe sleep disturbances for those with irregular work hours were 2.11 (95% CI 1.90–2.33) and 3.10 (95% CI 2.62–3.66), respectively. Work schedule irregularity and emotion suppression at work showed synergistic effect on both moderate and severe sleep disturbances. Sleep disturbances can lead to brain function deterioration and work-related injuries; therefore, appropriate measures should be addressed for the vulnerable population.
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Affiliation(s)
- Sehyun Yun
- Department of Occupational and Environmental Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul 03722, Korea; (S.Y.); (M.K.); (W.-T.L.)
- The Institute for Occupational Health, Yonsei University College of Medicine, Seoul 03722, Korea
- Graduate School of Public Health, Yonsei University College of Medicine, Seoul 03722, Korea;
| | - Minsuk Kim
- Department of Occupational and Environmental Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul 03722, Korea; (S.Y.); (M.K.); (W.-T.L.)
- The Institute for Occupational Health, Yonsei University College of Medicine, Seoul 03722, Korea
- Graduate School of Public Health, Yonsei University College of Medicine, Seoul 03722, Korea;
| | - Won-Tae Lee
- Department of Occupational and Environmental Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul 03722, Korea; (S.Y.); (M.K.); (W.-T.L.)
- The Institute for Occupational Health, Yonsei University College of Medicine, Seoul 03722, Korea
- Graduate School of Public Health, Yonsei University College of Medicine, Seoul 03722, Korea;
| | - Jin-Ha Yoon
- Graduate School of Public Health, Yonsei University College of Medicine, Seoul 03722, Korea;
- Department of Preventive Medicine, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Jong-Uk Won
- Department of Occupational and Environmental Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul 03722, Korea; (S.Y.); (M.K.); (W.-T.L.)
- The Institute for Occupational Health, Yonsei University College of Medicine, Seoul 03722, Korea
- Graduate School of Public Health, Yonsei University College of Medicine, Seoul 03722, Korea;
- Correspondence: ; Tel.: +82-2-2228-1579
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17
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Chen WL, Yang ZY, Wang CC, Chen YJ, Tsai CK, Li PF, Peng TC, Sun YS. Exploring the relationship between serum Vitamin D and shift work. JOURNAL OF MEDICAL SCIENCES 2021. [DOI: 10.4103/jmedsci.jmedsci_223_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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18
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Behringer W, Dodt C. [Physician staffing and shift work schedules : Concepts for emergency and intensive care medicine]. Med Klin Intensivmed Notfmed 2020; 115:449-457. [PMID: 32840636 DOI: 10.1007/s00063-020-00722-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 07/31/2020] [Accepted: 07/31/2020] [Indexed: 11/26/2022]
Abstract
Human resource development is a key factor for a successful management of Intensive Care Units (ICU) and Emergency Departments (ED). It comprises the processes of recruiting and retaining employees. The present article offers strategies how the optimal manning level in ICUs and EDs can be determined and highlights the importance of active management of well being in acute care units. The manning level can be determined by using the work place method which is the common method for ICUs. For the EDs a method based on the specific times which are needed for patient care in relation to the intensity of care is more appropriate. This method needs to integrate the patient number per hour, the time needed per patient, and the defined service level particularly with respect to the time to be seen by a physician. For detailed staff calculation, complex mathematical models are needed (e.g. Erlang formula). The resulting manning level needs then to be distributed on the various shifts. Additional resources are needed for observation units and additional tasks like management tasks etc. Retainment of employees is only possible when the working field remains attractive over many years. While a structured and competence based education is of utmost importance in the beginning of a carrier, attractive rooster plans and the compatibility between work and private life, becomes more important when the specialisation has been achieved.
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Affiliation(s)
- W Behringer
- Zentrum für Notfallmedizin, Universitätsklinikum Jena, Jena, Deutschland
| | - C Dodt
- Notfallzentrum, München Klinik Bogenhausen, Englschalkinger Str. 77, 81925, München, Deutschland.
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19
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Abstract
At the core of human thought, for the majority of individuals in the developed nations at least, there is the tacit assumption that as a species we are unfettered by the demands imposed by our biology and that we can do what we want, at whatever time we choose, whereas in reality every aspect of our physiology and behaviour is constrained by a 24 h beat arising from deep within our evolution. Our daily circadian rhythms and sleep/wake cycle allow us to function optimally in a dynamic world, adjusting our biology to the demands imposed by the day/night cycle. The themes developed in this review focus upon the growing realization that we ignore the circadian and sleep systems at our peril, and this paper considers the mechanisms that generate and regulate circadian and sleep systems; what happens mechanistically when these systems collapse as a result of societal pressures and disease; how sleep disruption and stress are linked; why sleep disruption and mental illness invariably occur together; and how individuals and employers can attempt to mitigate some of the problems associated with working against our internal temporal biology. While some of the health costs of sleep disruption can be reduced, in the short-term at least, there will always be significant negative consequences associated with shift work and sleep loss. With this in mind, society needs to address this issue and decide when the consequences of sleep disruption are justified in the workplace.
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Affiliation(s)
- Russell G. Foster
- Sleep and Circadian Neuroscience Institute (SCNi) and Nuffield Laboratory of Ophthalmology, Nuffield Department of Clinical Neurosciences, OMPI, Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
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20
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Evaluating the quality and duration of sleep using actigraphy in petroleum industry shift workers. Sleep Health 2020; 6:407-410. [PMID: 32507604 DOI: 10.1016/j.sleh.2020.04.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 04/10/2020] [Accepted: 04/23/2020] [Indexed: 11/23/2022]
Abstract
INTRODUCTION Increased use of shift work has led to more and more people working outside a traditional daytime schedule. Currently, approximately 20% of the labor force in developed countries is shift workers. Shift work can have devastating effects on employees' quality of life and sleep, leading to negative consequences for individuals and their families. This study evaluates the effect of different shift schedules (seven days/seven nights, fixed-day or fixed-night, and stand-by shift) on the sleep of oil rig shift workers. PARTICIPANTS AND METHODS In this cross-sectional study, 43 offshore workers from the National Iranian Drilling Company were enrolled. Subjects were asked to complete a questionnaire package consisting of the Epworth Sleepiness scale and Pittsburgh Sleep Quality Index (PSQI). Changes in sleep patterns were measured using actigraphy for different shift schedules. RESULTS The mean age of the participants was 35.9 ± 7.9 years and the mean tenure with the drilling company was 10 ± 6.8 years. The mean total sleep time was 353 ± 58 min. The seven day/seven night shift workers had less total sleep time than the other three groups of shift workers. The mean PSQI and Epworth Sleepiness scale scores were 6.77 ± 3.1 and 7.49 ± 4.3, respectively. Twelve shift workers (27%) were diagnosed with shift work disorder in the current study and 31 participants had poor sleep quality according to PSQI score (≥5). CONCLUSION Poor sleep quality is common in oil rig shift workers. Further research is needed to evaluate sleep problems in oil rig shift workers.
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21
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Dutheil F, Bessonnat B, Pereira B, Baker JS, Moustafa F, Fantini ML, Mermillod M, Navel V. Napping and cognitive performance during night shifts: a systematic review and meta-analysis. Sleep 2020; 43:5850954. [DOI: 10.1093/sleep/zsaa109] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 05/08/2020] [Indexed: 12/11/2022] Open
Abstract
Abstract
Study Objectives
To examine the benefits of napping during night shifts on cognitive performance.
Methods
Medline, Cochrane Library, Science direct, and Embase databases were searched up to July 1, 2019. Cognitive performance during night shifts, both before and following napping or under control conditions (no nap), in working-aged adults, were analyzed by time and by type of cognitive function (executive function, attention, instrumental function, and memory). Estimates were pooled using random-effects meta-analysis.
Results
A total of 18 articles (6 in real-work and 12 in laboratory) with a total of 494 participants were included. The mean nap duration was 41.6 ± 28.3 min, occurring between 12.00 am and 4.10 am, with a mean time set at 2.12 am. Cognitive performance did not differ at baseline between the groups (effect size 0.02, 95% CI −0.09 to 0.13). There was an overall improvement in performance following a nap compared to the control condition without a nap (0.25, 0.10 to 0.41). Positioning naps early in the night and activity (simulated work tasks) tended to improve cognitive performance (−0.57, −1.16 to 0.002, and 0.082, −0.04 to 0.33, respectively). The improvements were primarily seen 30 min after awakening. Only memory deteriorated immediately after awakening without an overall change in global cognitive performance.
Conclusion
Napping during night shifts seems to improve cognitive performance. Napping early in the night and activity may benefit cognitive performance over time. Considering lack of data in real work environments, further studies are warranted before preconizing napping during night shifts as a preventive strategy (safety, health, and economic outcomes).
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Affiliation(s)
- Frédéric Dutheil
- Université Clermont Auvergne, CNRS, LaPSCo, Physiological and Psychosocial Stress, CHU Clermont-Ferrand, University Hospital of Clermont-Ferrand, Preventive and Occupational Medicine, Clermont-Ferrand, France
- Faculty of Health, School of Exercise Science, Australian Catholic University, Melbourne, Australia
| | - Brice Bessonnat
- CHU Clermont-Ferrand, University Hospital of Clermont-Ferrand, Preventive and Occupational Medicine, Clermont-Ferrand, France
| | - Bruno Pereira
- CHU Clermont-Ferrand, University Hospital of Clermont-Ferrand, Biostatistics Unit, The Clinical Research and Innovation Direction, Clermont-Ferrand, France
| | - Julien S Baker
- Centre for Health and Exercise Science Research, Department of Sport, Physical Education and Health, Hong Kong Baptist University, Kowloon Tong, Hong Kong
| | - Fares Moustafa
- CHU Clermont-Ferrand, University Hospital of Clermont-Ferrand, Emergency, Clermont-Ferrand, France
| | - Maria Livia Fantini
- Université Clermont Auvergne, NPsy-Sydo, CHU Clermont-Ferrand, University Hospital of Clermont-Ferrand, Clermont-Ferrand, France
| | - Martial Mermillod
- Université Grenoble Alpes, France & CNRS, Grenoble, France
- Institut Universitaire de France, Paris, France
| | - Valentin Navel
- CHU Clermont-Ferrand, University Hospital of Clermont-Ferrand, Ophthalmology, Clermont-Ferrand, France
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22
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Selective Synthesis and Photoluminescence Study of Pyrazolopyridopyridazine Diones and N-Aminopyrazolopyrrolopyridine Diones. Molecules 2020; 25:molecules25102409. [PMID: 32455824 PMCID: PMC7288053 DOI: 10.3390/molecules25102409] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 05/19/2020] [Accepted: 05/19/2020] [Indexed: 11/16/2022] Open
Abstract
The newly designed luminol structures of pyrazolopyridopyridazine diones and N-aminopyrazolopyrrolopyridine diones were synthesized from versatile 1,3-diaryfuropyrazolopyridine-6,8-diones, 1,3-diarylpyrazolopyrrolopyridine-6,8-diones, or 1,3-diaryl-7-methylpyrazolopyrrolopyridine-6,8-diones with hydrazine monohydrate. Photoluminescent and solvatofluorism properties containing UV–Vis absorption, emission spectra, and quantum yield (Φf) study of pyrazolopyridopyridazine diones and N-aminopyrazolopyrrolopyridine diones were also studied. Generally, most of pyrazolopyrrolopyridine-6,8-diones 6 exhibited the significant fluorescence intensity and the substituent effect when compared with N-aminopyrazolopyrrolopyridine diones, particularly for 6c and 6j with a m-chloro group. Additionally, the fluorescence intensity of 6j was significantly promoted due to the suitable conjugation conformation. Based on the quantum yield (Φf) study, the value of compound 6j (0.140) with planar structural skeletal was similar to that of standard luminol (1, 0.175).
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Chaouch N, Mechergui N, Aissi W, Essid D, Khemila T, Ladhari N. [Effects of day shift work on quality of life and vigilance in Tunisia]. SANTE PUBLIQUE 2020; 31:623-631. [PMID: 32372601 DOI: 10.3917/spub.195.0623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
INTRODUCTION Alternate work is known to cause physical and mental health disorders for employees that can alter their quality of life and sleep. OBJECTIVE The purpose of this research was to evaluate workers quality of life and sleep in situations of alternate work. RESULTS In total, 391 workers answered the questionnaire. According to the type of schedule, 320 employees worked alternately on a 2×8 shift schedule and 71 worked on a permanent night shift schedule. The group of employees working at night had a better quality of life than the group of employees working in 2×8 in terms of both their physical and mental scores (P < 10-3). Type 2×8 workers were found to have excessive daytime sleepiness as compared to those on fixed night schedules. CONCLUSIONS Shortly, we can deduce from this study that alternating day shift work causes a deterioration of workers' quality of life of and generates sleep disorders..
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Bastille-Denis E, Lemyre A, Pappathomas A, Roy M, Vallières A. Are cognitive variables that maintain insomnia also involved in shift work disorder? Sleep Health 2020; 6:399-406. [PMID: 32280017 DOI: 10.1016/j.sleh.2020.02.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 02/10/2020] [Accepted: 02/22/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Shift Work Disorder (SWD) is explained mainly by a misalignment between the sleep schedule and the circadian rhythm. However, the possible role of cognitive variables in maintaining SWD remains unknown. Therefore, the objective of this study is to evaluate whether cognitive variables known to maintain insomnia in day workers might also be involved in perpetuating SWD. DESIGN Cross-sectional. SETTING Sleep laboratory. PARTICIPANTS Twenty-five shift workers diagnosed with SWD (84% females; mean age = 35.9) and 22 shift workers who are good sleepers (91% females; mean age = 34.1). MEASUREMENTS The participants completed a sleep diary for two weeks, answered questionnaires, and underwent the Harvey's semistructured interview and the catastrophizing procedure. Data from the catastrophizing procedure underwent a content analysis. RESULTS Compared with good sleepers, shift workers with SWD reported experiencing more thoughts that keep them awake, more presleep cognitive arousal, more dysfunctional beliefs related to worries and helplessness, and more selective attention toward worries and noises. However, the two groups did not differ on the tendency to catastrophize about difficulties falling asleep. Furthermore, 12 catastrophizing themes were identified in the entire sample, the most frequently endorsed being "sleepiness and energy" and "performance at work." CONCLUSIONS The results suggest that cognitive variables may play a role in maintaining SWD. Finally, worries that interfere with sleep in shift workers are related to their work context.
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Affiliation(s)
- Emmanuelle Bastille-Denis
- École de psychologie, Université Laval, Québec, Québec, Canada; Laboratoire Psycho/Socio/Culturel du sommeil, Université Laval, Québec, Québec, Canada
| | - Alexandre Lemyre
- École de psychologie, Université Laval, Québec, Québec, Canada; Laboratoire Psycho/Socio/Culturel du sommeil, Université Laval, Québec, Québec, Canada
| | - Alric Pappathomas
- École de psychologie, Université Laval, Québec, Québec, Canada; Laboratoire Psycho/Socio/Culturel du sommeil, Université Laval, Québec, Québec, Canada
| | - Monica Roy
- Recherche EPE inc., Lévis, Québec, Canada
| | - Annie Vallières
- École de psychologie, Université Laval, Québec, Québec, Canada; Laboratoire Psycho/Socio/Culturel du sommeil, Université Laval, Québec, Québec, Canada; Centre de recherche CERVO, Québec, Québec, Canada; Centre de recherche du CHU de Québec-Université Laval, Québec, Québec, Canada.
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Consequences of Circadian Disruption in Shift Workers on Chrononutrition and their Psychosocial Well-Being. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17062043. [PMID: 32204445 PMCID: PMC7142532 DOI: 10.3390/ijerph17062043] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 03/06/2020] [Accepted: 03/08/2020] [Indexed: 12/27/2022]
Abstract
The workers and employees in various institutions are subjected to different shifts and work schedules. The employees work not only at daytime but also during odd hours at night. The biological clock of an individual is often altered during night shifts. This affects the psychosocial well-being and circadian nutritional intake of the worker. Disturbance in circadian rhythm results in the development of metabolic disorders such as hypertension, dyslipidemia, dysglycemia, and abdominal obesity. In the present review, we discuss the nature of shift work, sleep/wake cycle of an individual, chrononutrition, dietary habits, and meal changes with regard to timing and frequency, related to shift work. We also discuss the relationship between nutritional intake and psychosocial well-being among shift workers. The review may be beneficial for prevention of metabolic disorders and maintaining sound psychological condition in shift workers.
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Kinlein SA, Karatsoreos IN. The hypothalamic-pituitary-adrenal axis as a substrate for stress resilience: Interactions with the circadian clock. Front Neuroendocrinol 2020; 56:100819. [PMID: 31863788 PMCID: PMC7643247 DOI: 10.1016/j.yfrne.2019.100819] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Revised: 10/29/2019] [Accepted: 12/17/2019] [Indexed: 12/22/2022]
Abstract
Stress, primarily processed via the hypothalamic-pituitary-adrenal (HPA) axis, engages biological pathways throughout the brain and body which promote adaptation and survival to changing environmental demands. Adaptation to environmental challenges is compromised when these pathways are no longer functioning optimally. The physiological and behavioral mechanisms through which HPA axis function influences stress adaptation and resilience are not fully elucidated. Our understanding of stress biology and disease must take into account the complex interactions between the endocrine system, neural circuits, and behavioral coping strategies. In addition, further consideration must be taken concerning influences of other aspects of physiology, including the circadian clock which is critical for regulation of daily changes in HPA activity. While adding a layer of complexity, it also offers targets for intervention. Understanding the role of HPA function in mediating these diverse biological responses will lead to important insights about how to bolster successful stress adaptation and promote stress resilience.
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Affiliation(s)
- Scott A Kinlein
- Department of Integrative Physiology and Neuroscience, Washington State University, Pullman, WA 99164, United States
| | - Ilia N Karatsoreos
- Department of Integrative Physiology and Neuroscience, Washington State University, Pullman, WA 99164, United States; Department of Psychological and Brain Sciences, University of Massachusetts, Amherst, MA 01003, United States.
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Correia FGS, Ferreira MJM, Giatti L, Camelo LV, Araújo LF. Night work is related to higher global and central adiposity in Brazil: National Health Survey, 2013. Am J Ind Med 2020; 63:85-91. [PMID: 31625176 DOI: 10.1002/ajim.23054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 09/24/2019] [Accepted: 10/01/2019] [Indexed: 12/20/2022]
Abstract
BACKGROUND Night work can disturb the natural circadian rhythm, leading to disruptions in metabolic rate and subsequent overall gain weight or even more harmful abdominal adiposity. Our aims were to investigate the associations between night work frequency and markers of overall and central obesity. METHODS We conducted a cross-sectional analysis of data from the Brazilian National Health Survey on over 35 500 current workers. Exposure to current night work was composed of three categories: daytime work (reference category), less than one night per week, and more than two nights per week. The body mass index and waist circumference were used as adiposity markers. Logistic and multinomial regression models were used, with adjustment for demographic characteristics, work conditions, self-related health, and health-related behaviors. RESULTS After complete adjustment, individuals who worked two or more nights a week had higher odds of overweight (odds ratio [OR]: 1.20, 95% CI: 1.04-1.38), obesity (OR: 1.38, 95% CI: 1.17-1.64) and increased waist circumference (OR: 1.27, 95% CI: 1.10-1.46) than daytime workers. CONCLUSIONS Night work was significantly associated with measures of adiposity. Changes in working conditions, such as controlling the numbers of nights worked per week or promoting workplaces with healthy meals and the opportunity to perform physical exercise at work, could be suggested.
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Affiliation(s)
| | | | - Luana Giatti
- Research Group on Epidemiology on Chronic and Occupational Diseases (GERMINAL)Federal University of Minas Gerais Belo Horizonte Brazil
| | - Lidyane V. Camelo
- Research Group on Epidemiology on Chronic and Occupational Diseases (GERMINAL)Federal University of Minas Gerais Belo Horizonte Brazil
| | - Larissa F. Araújo
- Department of Public HealthFederal University of Ceará Fortaleza Brazil
- Research Group on Epidemiology on Chronic and Occupational Diseases (GERMINAL)Federal University of Minas Gerais Belo Horizonte Brazil
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Postolache TT, Gulati A, Okusaga OO, Stiller JW. An Introduction to Circadian Endocrine Physiology: Implications for Exercise and Sports Performance. ENDOCRINOLOGY OF PHYSICAL ACTIVITY AND SPORT 2020. [DOI: 10.1007/978-3-030-33376-8_20] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Abstract
PURPOSE The objective of this study is to quantitatively evaluate the well-being of residents doing casino shifts compared with those doing standard overnight shifts while working in an academic pediatric emergency department. METHODS A randomized prospective survey study was performed over a period of 1 year on all residents who were scheduled to complete a 28-day block. Each block (28-day period) within the year was designated as either a "standard" or "casino" block. The standard overnight shifts were scheduled from midnight to 0800 hours, and casino shifts occurred from either 2000 to 0400 hours (casino A) and 0400 to 1200 hours (casino B). Participating residents were asked to complete both a preblock and postblock survey. The primary outcome was defined as differences in resident well-being as assessed by the brief resident wellness profile (BRWP). A mood faces graphical rating item to assess overall mood was used as a secondary outcome measures as well as a 10-item survey based on World Health Organization domains for quality of life and adapted to reflect completion of shiftwork. RESULTS A total of 124 (90%) of 138 residents completed the study and were included in the analysis. No significant difference in resident well-being measured by BRWP between those in the standard and casino shift groups (17 ± 2.5 for preblock standard and 16.9 ± 2.8 for casino, P = 0.904; 17.1 ± 2.7 for postblock standard and 17.2 ± 3.1 for casino, P = 0.817), or in the relative change of the BRWP preblock and postblock between the 2 groups (standard, 0.35 ± 2.7; casino, 0.29 ± 3.0; P = 0.926). No significant difference in the mood faces rating scale scores or the 10-item postblock survey was found. CONCLUSIONS In the first study examining the effects of casino shifts on trainees, we found no effect of standard overnight versus casino shifts on their well-being. This counters the benefits previously seen in emergency department consultant staff and highlights the need for more studies specifically in trainees.
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Lauren S, Chen Y, Friel C, Chang BP, Shechter A. Free-Living Sleep, Food Intake, and Physical Activity in Night and Morning Shift Workers. J Am Coll Nutr 2019; 39:450-456. [PMID: 31743081 DOI: 10.1080/07315724.2019.1691954] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Objective: Shift work is associated with risk for adverse health outcomes including cardiovascular disease, type 2 diabetes, cancer, and obesity. Short sleep duration combined with disruptions to the circadian system may alter factors involved with the behavioral regulation of energy intake and expenditure. We aimed to determine how shift work affects sleep, food intake, and physical activity.Methods: This was a field-based observational study using objective assessments of sleep and physical activity and a 24-hour dietary recall in shift workers. Day (n = 12) and night (n = 12) hospital shift workers (nurses and technicians) who were women had their free-living sleep and physical activity tracked via accelerometry, and completed a computer-assisted 24-hour food recall, during a series of work shifts.Results: Compared to day workers, night workers had significantly shorter sleep duration and reported more premature awakenings and feeling less refreshed upon awakening. Daily self-reported energy and macronutrient intakes were not different between groups, although the night shift workers reported a significantly longer total daily eating duration window than day workers. Objectively recorded physical activity levels were not different between groups.Conclusions: The present findings confirm that sleep is disturbed in women night workers, while there are relatively less effects on objectively recorded physical activity and self-reported food intake. We also observed a prolonged daily eating duration in night vs. day workers. These observations can help inform the design of novel behavioral interventions, including, potentially, time restricted feeding approaches (e.g., by limiting daily eating episodes to within a 10-12 h window), to optimize weight management in shift workers.
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Affiliation(s)
- Shaza Lauren
- Institute of Human Nutrition, Columbia University Medical Center, New York, New York, USA
| | - Yichi Chen
- Institute of Human Nutrition, Columbia University Medical Center, New York, New York, USA
| | - Ciaran Friel
- Center for Behavioral Cardiovascular Health, Columbia University Medical Center, New York, New York, USA
| | - Bernard P Chang
- Department of Emergency Medicine, Columbia University Medical Center, New York, New York, USA
| | - Ari Shechter
- Center for Behavioral Cardiovascular Health, Columbia University Medical Center, New York, New York, USA
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Linking decent work with physical and mental health: A psychology of working perspective. JOURNAL OF VOCATIONAL BEHAVIOR 2019. [DOI: 10.1016/j.jvb.2019.05.002] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Bazazan A, Rasoulzadeh Y, Dianat I, Safaiyan A, Mombeini Z. Occupational fatigue and mental health complaints among 8-hour shift workers of petrochemical industries in Iran. Work 2019; 62:309-317. [PMID: 30829641 DOI: 10.3233/wor-192865] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Shift working is unavoidable in many industries with continual material processing such as petrochemical plants. So, the adverse effects of shift working on workers should be seriously considered. OBJECTIVE This cross-sectional study evaluated occupational fatigue and mental health complaints and their relationship in rotating 8-hour shift workers. METHOD In this study, 287 shift workers participated. The Multidimensional Fatigue Inventory (MFI-20) and General Health Questionnaire (GHQ-28) were used to evaluate the level of fatigue and mental health, respectively. RESULT A relatively high prevalence of mental health complaints (particularly social dysfunction) and fatigue (especially general fatigue) were found among the study population. In general, 43.4% of participants reported a mental health problem. A moderate correlation was found between fatigue and mental health (r = 0.58). The stepwise regression model revealed that fatigue was significantly related only to "anxiety and insomnia" and "severe depression". CONCLUSION This study revealed that the 8 h shift workers in studied areas are exposed to a considerable risk of mental health and fatigue. So, improving the ergonomics and health aspects of the workplace is recommended to reduce related risk factors.
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Affiliation(s)
- Ahmad Bazazan
- Department of Occupational Health and Ergonomics, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Yahya Rasoulzadeh
- Department of Occupational Health and Ergonomics, Tabriz University of Medical Sciences, Tabriz, Iran.,Road Traffic Injury Research Center, Tabriz University of Medical Sciences, Tabriz, IR Iran
| | - Iman Dianat
- Department of Occupational Health and Ergonomics, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Abdolrasoul Safaiyan
- Department of Vital Statistics and Epidemiology, Faculty of Health, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Zohreh Mombeini
- Department of Occupational Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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Kolbe I, Brehm N, Oster H. Interplay of central and peripheral circadian clocks in energy metabolism regulation. J Neuroendocrinol 2019; 31:e12659. [PMID: 30415480 DOI: 10.1111/jne.12659] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 11/01/2018] [Accepted: 11/05/2018] [Indexed: 12/11/2022]
Abstract
Metabolic health founds on a homeostatic balance that has to integrate the daily changes of rest/activity and feeding/fasting cycles. A network of endogenous 24-hour circadian clocks helps to anticipate daily recurring events and adjust physiology and behavioural functions accordingly. Circadian clocks are self-sustained cellular oscillators based on a set of clock genes/proteins organised in interlocked transcriptional-translational feedback loops. The body's clocks need to be regularly reset and synchronised with each other to achieve coherent rhythmic output signals. This synchronisation is achieved by interplay of a master clock, which resides in the suprachiasmatic nucleus, and peripheral tissue clocks. This clock network is reset by time signals such as the light/dark cycle, food intake and activity. The balanced interplay of clocks is easily disturbed in modern society by shiftwork or high-energy diets, which may further promote the development of metabolic disorders. In this review, we summarise the current model of central-peripheral clock interaction in metabolic health. Different established mouse models for central or peripheral clock disruption and their metabolic phenotypes are compared and the possible relevance of clock network interaction for the development of therapeutic approaches in humans is discussed.
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Affiliation(s)
- Isa Kolbe
- Institute of Neurobiology, University of Lubeck, Lubeck, Germany
| | - Niklas Brehm
- Institute of Neurobiology, University of Lubeck, Lubeck, Germany
| | - Henrik Oster
- Institute of Neurobiology, University of Lubeck, Lubeck, Germany
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HONN KA, VAN DONGEN HP, DAWSON D. Working Time Society consensus statements: Prescriptive rule sets and risk management-based approaches for the management of fatigue-related risk in working time arrangements. INDUSTRIAL HEALTH 2019; 57:264-280. [PMID: 30700674 PMCID: PMC6449640 DOI: 10.2486/indhealth.sw-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Traditionally, working time arrangements to limit fatigue-related risk have taken a prescriptive approach, which sets maximum shift durations in order to prevent excessive buildup of fatigue (and the associated increased risk) within shifts and sets minimum break durations to allow adequate time for rest and recovery within and/or between shifts. Prescriptive rule sets can be successful when, from a fatigue-related risk standpoint, they classify safe work hours as permitted and unsafe work hours as not permitted. However, prescriptive rule sets ignore important aspects of the biological factors (such as the interaction between circadian and homeostatic processes) that drive fatigue, which are critical modulators of the relationship between work hours and fatigue-related risk. As such, in around-the-clock operations when people must work outside of normal daytime hours, the relationship between regulatory compliance and safety tends to break down, and thus these rule sets become less effective. To address this issue, risk management-based approaches have been designed to regulate the procedures associated with managing fatigue-related risk. These risk management-based approaches are suitable for nighttime operations and a variety of other non-standard work schedules, and can be tailored to the particular job or industry. Although the purpose of these fatigue risk management approaches is to curb fatigue risk, fatigue risk cannot be measured directly. Thus, the goal is not on regulating fatigue risk per se, but rather to put in place procedures that serve to address fatigue before, during, and after potential fatigue-related incidents. Examples include predictive mathematical modeling of fatigue for work scheduling, proactive fatigue monitoring in the workplace, and reactive post-incident follow-up. With different risks and different needs across industries, there is no "one size fits all" approach to managing fatigue-related risk. However, hybrid strategies combining prescriptive rule sets and risk management-based approaches can create the flexibility necessary to reduce fatigue-related risk based on the specific needs of different work environments while maintaining appropriate regulatory oversight.
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Affiliation(s)
- Kimberly A. HONN
- Sleep and Performance Research Center and Elson S. Floyd
College of Medicine, Washington State University, USA
- *To whom correspondence should be addressed. E-mail:
| | - Hans P.A. VAN DONGEN
- Sleep and Performance Research Center and Elson S. Floyd
College of Medicine, Washington State University, USA
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ARLINGHAUS A, BOHLE P, ISKRA-GOLEC I, JANSEN N, JAY S, ROTENBERG L. Working Time Society consensus statements: Evidence-based effects of shift work and non-standard working hours on workers, family and community. INDUSTRIAL HEALTH 2019; 57:184-200. [PMID: 30700670 PMCID: PMC6449634 DOI: 10.2486/indhealth.sw-4] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Working time arrangements that require shift work or other non-standard working hours have significant potential to encroach on time that is highly valued for family, social and leisure activity. This can often result in workers experiencing poorer work-family or work-life balance. Based on an extensive literature search and expert knowledge, primary risk factors were identified including shift work; long, irregular and unpredictable working hours; and work on evenings and weekends (in combination and independent of shift work). On the other hand, flexibility, in the form of adequate worker control over work schedules, may be a protective factor. In addition, workers experiencing excessive work-life conflict are likely to reduce their working hours, reflecting a reciprocal relationship between working hours and work-life balance. Workers' families are also affected by shift work and non-standard working hours. Parents' shift work is associated with poorer emotional and developmental outcomes for their children, and to a greater likelihood of risky behavior in adolescence. Additionally, the risk of separation or divorce is increased, especially for parents working night shifts. Due to relationships such as those above, the consequences of shiftwork and non-standard working hours on family and social life are largely dependent on a complex interaction between specific work schedules, other aspects of work organization, and family and individual worker characteristics. This article provides an overview of current evidence regarding the relationships between working time arrangements and various social and family variables, and concludes with shift scheduling and intervention recommendations to improve work-life balance and social well-being.
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Affiliation(s)
- Anna ARLINGHAUS
- XIMES GmbH, Austria
- *To whom correspondence should be addressed. E-mail:
| | - Philip BOHLE
- Faculty of Health Sciences, The University of Sydney,
Australia
| | - Irena ISKRA-GOLEC
- Institute of Psychology, SWPS University of Social Sciences
and Humanities, Poland
| | - Nicole JANSEN
- Department of Epidemiology, CAPHRI School for Public Health
and Primary Care, Faculty of Health, Medicine and Life Sciences, Maastricht University,
The Netherlands
| | - Sarah JAY
- Appleton Institute, School of Health, Medical and Applied
Sciences, CQUniversity, Australia
| | - Lucia ROTENBERG
- Laboratory of Environmental and Health Education, Oswaldo
Cruz Institute, Brazil
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López-Soto PJ, Fabbian F, Cappadona R, Zucchi B, Manfredini F, García-Arcos A, Carmona-Torres JM, Manfredini R, Rodríguez-Borrego MA. Chronotype, nursing activity, and gender: A systematic review. J Adv Nurs 2018; 75:734-748. [PMID: 30307057 DOI: 10.1111/jan.13876] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 08/18/2018] [Accepted: 09/04/2018] [Indexed: 12/12/2022]
Abstract
AIM To synthesize evidence about the effect of individual circadian preference (chronotype) and gender in the development of sleep and mood problems in nursing professionals. BACKGROUND Shift workers are more prone to having unhealthy habits and unfavourable clinical conditions than nonshift workers. These associations are mediated by chronotype and gender differences have also been detected. DESIGN A quantitative systematic review. DATA SOURCES Electronic searches were performed in MEDLINE, Scopus, ScienceDirect, and Web of Science from 1 July 2012 - 1 July 2017. REVIEW METHODS A systematic review was conducted using the Cochrane Collaboration guidelines and two quality assessment tools: the National Heart, Lung and Blood Institute and GRADE. Inclusion criteria were quantitative studies where the sample consists entirely of nurses, analysing circadian rhythms or individual chronotype or gender and sleep/mood disturbances in nursing activity. The review was reported using the PRISMA statement. RESULTS A total of 23 studies were included in the review (five cohort studies and 18 cross-sectional studies). Data on gender-specific attention were scarce (two studies) and showed a higher incidence of sleep problems. Female nurses with eveningness-oriented personality seem to be more prone to having sleep disorders, insomnia, fatigue, and anxiety than male and morningness ones. CONCLUSIONS Evidence seems to show that female nurses with an evening-oriented preference suffer more problems of insomnia, sleepiness, fatigue, and anxiety. The impact of our results may affect nurses, patient safety and the quality of clinical practice.
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Affiliation(s)
- Pablo J López-Soto
- Department of Nursing, Maimonides Biomedical Research Institute of Cordoba (IMIBIC), Córdoba, Spain.,Faculty of Medicine and Nursing, University of Cordoba, Córdoba, Spain
| | - Fabio Fabbian
- Faculty of Medicine, Pharmacy and Prevention, University of Ferrara, Ferrara, Italy.,Center for Studies on Gender Medicine, University of Ferrara, Ferrara, Italy
| | - Rosaria Cappadona
- Faculty of Medicine, Pharmacy and Prevention, University of Ferrara, Ferrara, Italy.,Center for Studies on Gender Medicine, University of Ferrara, Ferrara, Italy
| | - Beatrice Zucchi
- Faculty of Medicine, Pharmacy and Prevention, University of Ferrara, Ferrara, Italy.,Center for Studies on Gender Medicine, University of Ferrara, Ferrara, Italy
| | - Fabio Manfredini
- Faculty of Medicine, Pharmacy and Prevention, University of Ferrara, Ferrara, Italy
| | - Aurora García-Arcos
- Department of Nursing, Maimonides Biomedical Research Institute of Cordoba (IMIBIC), Córdoba, Spain.,Faculty of Medicine and Nursing, University of Cordoba, Córdoba, Spain
| | - Juan Manuel Carmona-Torres
- Department of Nursing, Maimonides Biomedical Research Institute of Cordoba (IMIBIC), Córdoba, Spain.,University of Castilla-La Mancha (UCLM), E.U. Enfermería y Fisioterapia de Toledo, Toledo, Spain
| | - Roberto Manfredini
- Faculty of Medicine, Pharmacy and Prevention, University of Ferrara, Ferrara, Italy.,Center for Studies on Gender Medicine, University of Ferrara, Ferrara, Italy
| | - María Aurora Rodríguez-Borrego
- Department of Nursing, Maimonides Biomedical Research Institute of Cordoba (IMIBIC), Córdoba, Spain.,Faculty of Medicine and Nursing, University of Cordoba, Córdoba, Spain.,Reina Sofia University Hospital, Córdoba, Spain
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Metlaine A, Leger D, Esquirol Y. Surveillance et prévention des conséquences du travail poste et de nuit : état des lieux et recommandations. Presse Med 2018; 47:982-990. [DOI: 10.1016/j.lpm.2018.10.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 10/04/2018] [Accepted: 10/08/2018] [Indexed: 11/30/2022] Open
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Nena E, Katsaouni M, Steiropoulos P, Theodorou E, Constantinidis TC, Tripsianis G. Effect of Shift Work on Sleep, Health, and Quality of Life of Health-care Workers. Indian J Occup Environ Med 2018; 22:29-34. [PMID: 29743782 PMCID: PMC5932908 DOI: 10.4103/ijoem.ijoem_4_18] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Background: Shift work is associated with sleep disruption, impaired quality of life, and is a risk factor for several health conditions. Aim of this study was to investigate the impact of shift work on sleep and quality of life of health-care workers (HCW). Settings: Tertiary University hospital in Greece. Study Design: Cross-sectional study. Materials and Methods: Included were HCW, working either in an irregular shift system or exclusively in morning shifts. All participants answered the WHO-5 Well-Being Index (WHO-5) and a questionnaire on demographics and medical history. Shift workers filled the Shift Work Disorders Screening Questionnaire (SWDSQ). Statistical Analysis: Descriptive statistics, Student's t-test, one-way analysis of variance (ANOVA), Pearson's r correlation coefficient, and multivariate stepwise linear regression analysis were applied. Results: Included were 312 employees (87.9% females), 194 working in irregular shift system and 118 in morning shifts. Most shift-workers (58.2%) were somehow or totally dissatisfied with their sleep quality. Regression analysis revealed the following independent determinants for sleep impairment: parenthood (P < 0.001), age 36–45 years (P < 0.001), >3 night shifts/week (P < 0.001), work >5 years in an irregular shift system (P < 0.001). Diabetes mellitus was the most common medical condition reported by shift workers (P = 0.008). Comparison between the two groups revealed a significantly impairment in WHO-5 total score, as well as in 4 of 5 of its items (P < 0.001). Conclusion: Shift-work impairs quality of life, whereas its duration and frequency, along with age and family status of employees can have adverse effects on sleep.
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Affiliation(s)
- Evangelia Nena
- Laboratory of Hygiene and Environmental Protection, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
| | - Maria Katsaouni
- Laboratory of Hygiene and Environmental Protection, Medical School, Democritus University of Thrace, Alexandroupolis, Greece.,Master of Science (M.Sc.) Program in Sleep Medicine, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
| | - Paschalis Steiropoulos
- Master of Science (M.Sc.) Program in Sleep Medicine, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
| | - Evangelos Theodorou
- Laboratory of Medical Statistics, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
| | - Theodoros C Constantinidis
- Laboratory of Hygiene and Environmental Protection, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
| | - Grigorios Tripsianis
- Laboratory of Medical Statistics, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
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Rapid resetting of human peripheral clocks by phototherapy during simulated night shift work. Sci Rep 2017; 7:16310. [PMID: 29176713 PMCID: PMC5701225 DOI: 10.1038/s41598-017-16429-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 11/08/2017] [Indexed: 11/22/2022] Open
Abstract
A majority of night shift workers have their circadian rhythms misaligned to their atypical schedule. While bright light exposure at night is known to reset the human central circadian clock, the behavior of peripheral clocks under conditions of shift work is more elusive. The aim of the present study was to quantify the resetting effects of bright light exposure on both central (plasma cortisol and melatonin) and peripheral clocks markers (clock gene expression in peripheral blood mononuclear cells, PBMCs) in subjects living at night. Eighteen healthy subjects were enrolled to either a control (dim light) or a bright light group. Blood was sampled at baseline and on the 4th day of simulated night shift. In response to a night-oriented schedule, the phase of PER1 and BMAL1 rhythms in PBMCs was delayed by ~2.5–3 h (P < 0.05), while no shift was observed for the other clock genes and the central markers. Three cycles of 8-h bright light induced significant phase delays (P < 0.05) of ~7–9 h for central and peripheral markers, except BMAL1 (advanced by +5h29; P < 0.05). Here, we demonstrate in humans a lack of peripheral clock adaptation under a night-oriented schedule and a rapid resetting effect of nocturnal bright light exposure on peripheral clocks.
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Abstract
Female ovulation depends on a surge in circulating luteinizing hormone (LH) which occurs at the end of the resting period and requests high circulating estradiol. This fine tuning involves both an estradiol feedback as an indicator of oocyte maturation, and the master circadian clock of the suprachiasmatic nuclei as an indicator of the time of the day. This review describes the mechanisms through which daily time cues are conveyed to reproductive hypothalamic neurons to time the pre-ovulatory surge. In female rodents, neurotransmitters released by the suprachiasmatic nuclei activate the stimulatory kisspeptin neurons and reduce the inhibitory RFRP neurons precisely at the end of the afternoon of proestrus to allow a full surge in LH secretion. From these findings, the impact of circadian disruptions (during shift or night work) on female reproductive performance and fertility should now being investigated in both animal models and humans.
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Affiliation(s)
- Valérie Simonneaux
- Institut des Neurosciences Cellulaires et Intégratives, UPR CNRS 3212, 5 rue Blaise Pascal, 67084 Strasbourg, France.
| | - Thibault Bahougne
- Institut des Neurosciences Cellulaires et Intégratives, UPR CNRS 3212, 5 rue Blaise Pascal, 67084 Strasbourg, France; Service d'Endocrinologie et Diabète, Hôpital Civil, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.
| | - Eleni Angelopoulou
- Institut des Neurosciences Cellulaires et Intégratives, UPR CNRS 3212, 5 rue Blaise Pascal, 67084 Strasbourg, France; Department of Endocrinology and Metabolism, Academic Medical Center (AMC), University of Amsterdam, Amsterdam, Netherlands.
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Husse J, Kiehn JT, Barclay JL, Naujokat N, Meyer-Kovac J, Lehnert H, Oster H. Tissue-Specific Dissociation of Diurnal Transcriptome Rhythms During Sleep Restriction in Mice. Sleep 2017; 40:3751182. [DOI: 10.1093/sleep/zsx068] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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42
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Oster H, Challet E, Ott V, Arvat E, de Kloet ER, Dijk DJ, Lightman S, Vgontzas A, Van Cauter E. The Functional and Clinical Significance of the 24-Hour Rhythm of Circulating Glucocorticoids. Endocr Rev 2017; 38:3-45. [PMID: 27749086 PMCID: PMC5563520 DOI: 10.1210/er.2015-1080] [Citation(s) in RCA: 287] [Impact Index Per Article: 41.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 09/21/2016] [Indexed: 02/07/2023]
Abstract
Adrenal glucocorticoids are major modulators of multiple functions, including energy metabolism, stress responses, immunity, and cognition. The endogenous secretion of glucocorticoids is normally characterized by a prominent and robust circadian (around 24 hours) oscillation, with a daily peak around the time of the habitual sleep-wake transition and minimal levels in the evening and early part of the night. It has long been recognized that this 24-hour rhythm partly reflects the activity of a master circadian pacemaker located in the suprachiasmatic nucleus of the hypothalamus. In the past decade, secondary circadian clocks based on the same molecular machinery as the central master pacemaker were found in other brain areas as well as in most peripheral tissues, including the adrenal glands. Evidence is rapidly accumulating to indicate that misalignment between central and peripheral clocks has a host of adverse effects. The robust rhythm in circulating glucocorticoid levels has been recognized as a major internal synchronizer of the circadian system. The present review examines the scientific foundation of these novel advances and their implications for health and disease prevention and treatment.
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Affiliation(s)
- Henrik Oster
- Medical Department I (H.O., V.O.), University of Lübeck, 23562 Lübeck, Germany; Institute for Cellular and Integrative Neuroscience (E.C.), Centre National de la Recherche Scientifique (CNRS) UPR 3212, University of Strasbourg, 67084 Strasbourg, France; Division of Endocrinology, Diabetology and Metabolism (E.A.), Department of Internal Medicine, University of Turin, 10043 Turin, Italy; Department of Endocrinology and Metabolic Disease (E.R.d.K.), Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; Surrey Sleep Research Center (D.-J.D.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XP, United Kingdom; Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology (S.L.), University of Bristol, Bristol BS8 1TH, United Kingdom; Sleep Research and Treatment Center (A.V.), Department of Psychiatry, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033; and Sleep, Metabolism, and Health Center (E.V.C.), Department of Medicine, University of Chicago, Chicago, Illinois 60637
| | - Etienne Challet
- Medical Department I (H.O., V.O.), University of Lübeck, 23562 Lübeck, Germany; Institute for Cellular and Integrative Neuroscience (E.C.), Centre National de la Recherche Scientifique (CNRS) UPR 3212, University of Strasbourg, 67084 Strasbourg, France; Division of Endocrinology, Diabetology and Metabolism (E.A.), Department of Internal Medicine, University of Turin, 10043 Turin, Italy; Department of Endocrinology and Metabolic Disease (E.R.d.K.), Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; Surrey Sleep Research Center (D.-J.D.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XP, United Kingdom; Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology (S.L.), University of Bristol, Bristol BS8 1TH, United Kingdom; Sleep Research and Treatment Center (A.V.), Department of Psychiatry, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033; and Sleep, Metabolism, and Health Center (E.V.C.), Department of Medicine, University of Chicago, Chicago, Illinois 60637
| | - Volker Ott
- Medical Department I (H.O., V.O.), University of Lübeck, 23562 Lübeck, Germany; Institute for Cellular and Integrative Neuroscience (E.C.), Centre National de la Recherche Scientifique (CNRS) UPR 3212, University of Strasbourg, 67084 Strasbourg, France; Division of Endocrinology, Diabetology and Metabolism (E.A.), Department of Internal Medicine, University of Turin, 10043 Turin, Italy; Department of Endocrinology and Metabolic Disease (E.R.d.K.), Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; Surrey Sleep Research Center (D.-J.D.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XP, United Kingdom; Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology (S.L.), University of Bristol, Bristol BS8 1TH, United Kingdom; Sleep Research and Treatment Center (A.V.), Department of Psychiatry, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033; and Sleep, Metabolism, and Health Center (E.V.C.), Department of Medicine, University of Chicago, Chicago, Illinois 60637
| | - Emanuela Arvat
- Medical Department I (H.O., V.O.), University of Lübeck, 23562 Lübeck, Germany; Institute for Cellular and Integrative Neuroscience (E.C.), Centre National de la Recherche Scientifique (CNRS) UPR 3212, University of Strasbourg, 67084 Strasbourg, France; Division of Endocrinology, Diabetology and Metabolism (E.A.), Department of Internal Medicine, University of Turin, 10043 Turin, Italy; Department of Endocrinology and Metabolic Disease (E.R.d.K.), Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; Surrey Sleep Research Center (D.-J.D.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XP, United Kingdom; Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology (S.L.), University of Bristol, Bristol BS8 1TH, United Kingdom; Sleep Research and Treatment Center (A.V.), Department of Psychiatry, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033; and Sleep, Metabolism, and Health Center (E.V.C.), Department of Medicine, University of Chicago, Chicago, Illinois 60637
| | - E Ronald de Kloet
- Medical Department I (H.O., V.O.), University of Lübeck, 23562 Lübeck, Germany; Institute for Cellular and Integrative Neuroscience (E.C.), Centre National de la Recherche Scientifique (CNRS) UPR 3212, University of Strasbourg, 67084 Strasbourg, France; Division of Endocrinology, Diabetology and Metabolism (E.A.), Department of Internal Medicine, University of Turin, 10043 Turin, Italy; Department of Endocrinology and Metabolic Disease (E.R.d.K.), Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; Surrey Sleep Research Center (D.-J.D.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XP, United Kingdom; Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology (S.L.), University of Bristol, Bristol BS8 1TH, United Kingdom; Sleep Research and Treatment Center (A.V.), Department of Psychiatry, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033; and Sleep, Metabolism, and Health Center (E.V.C.), Department of Medicine, University of Chicago, Chicago, Illinois 60637
| | - Derk-Jan Dijk
- Medical Department I (H.O., V.O.), University of Lübeck, 23562 Lübeck, Germany; Institute for Cellular and Integrative Neuroscience (E.C.), Centre National de la Recherche Scientifique (CNRS) UPR 3212, University of Strasbourg, 67084 Strasbourg, France; Division of Endocrinology, Diabetology and Metabolism (E.A.), Department of Internal Medicine, University of Turin, 10043 Turin, Italy; Department of Endocrinology and Metabolic Disease (E.R.d.K.), Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; Surrey Sleep Research Center (D.-J.D.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XP, United Kingdom; Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology (S.L.), University of Bristol, Bristol BS8 1TH, United Kingdom; Sleep Research and Treatment Center (A.V.), Department of Psychiatry, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033; and Sleep, Metabolism, and Health Center (E.V.C.), Department of Medicine, University of Chicago, Chicago, Illinois 60637
| | - Stafford Lightman
- Medical Department I (H.O., V.O.), University of Lübeck, 23562 Lübeck, Germany; Institute for Cellular and Integrative Neuroscience (E.C.), Centre National de la Recherche Scientifique (CNRS) UPR 3212, University of Strasbourg, 67084 Strasbourg, France; Division of Endocrinology, Diabetology and Metabolism (E.A.), Department of Internal Medicine, University of Turin, 10043 Turin, Italy; Department of Endocrinology and Metabolic Disease (E.R.d.K.), Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; Surrey Sleep Research Center (D.-J.D.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XP, United Kingdom; Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology (S.L.), University of Bristol, Bristol BS8 1TH, United Kingdom; Sleep Research and Treatment Center (A.V.), Department of Psychiatry, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033; and Sleep, Metabolism, and Health Center (E.V.C.), Department of Medicine, University of Chicago, Chicago, Illinois 60637
| | - Alexandros Vgontzas
- Medical Department I (H.O., V.O.), University of Lübeck, 23562 Lübeck, Germany; Institute for Cellular and Integrative Neuroscience (E.C.), Centre National de la Recherche Scientifique (CNRS) UPR 3212, University of Strasbourg, 67084 Strasbourg, France; Division of Endocrinology, Diabetology and Metabolism (E.A.), Department of Internal Medicine, University of Turin, 10043 Turin, Italy; Department of Endocrinology and Metabolic Disease (E.R.d.K.), Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; Surrey Sleep Research Center (D.-J.D.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XP, United Kingdom; Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology (S.L.), University of Bristol, Bristol BS8 1TH, United Kingdom; Sleep Research and Treatment Center (A.V.), Department of Psychiatry, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033; and Sleep, Metabolism, and Health Center (E.V.C.), Department of Medicine, University of Chicago, Chicago, Illinois 60637
| | - Eve Van Cauter
- Medical Department I (H.O., V.O.), University of Lübeck, 23562 Lübeck, Germany; Institute for Cellular and Integrative Neuroscience (E.C.), Centre National de la Recherche Scientifique (CNRS) UPR 3212, University of Strasbourg, 67084 Strasbourg, France; Division of Endocrinology, Diabetology and Metabolism (E.A.), Department of Internal Medicine, University of Turin, 10043 Turin, Italy; Department of Endocrinology and Metabolic Disease (E.R.d.K.), Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; Surrey Sleep Research Center (D.-J.D.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XP, United Kingdom; Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology (S.L.), University of Bristol, Bristol BS8 1TH, United Kingdom; Sleep Research and Treatment Center (A.V.), Department of Psychiatry, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033; and Sleep, Metabolism, and Health Center (E.V.C.), Department of Medicine, University of Chicago, Chicago, Illinois 60637
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43
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Molzof HE, Wirth MD, Burch JB, Shivappa N, Hebert JR, Johnson RL, Gamble KL. The impact of meal timing on cardiometabolic syndrome indicators in shift workers. Chronobiol Int 2017; 34:337-348. [PMID: 28107043 DOI: 10.1080/07420528.2016.1259242] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The aims of this study were to 1) compare the inflammatory potential of night- and day-shift nurses' diets with regard to time of day and work status and 2) explore how the timing of food intake during work and off-work is associated with cardiometabolic syndrome (CMS) risk factors between these two groups. Female nurses (N = 17; 8 day-shift and 9 night-shift) reported food intake over 9 days. On a middle day off of work, metabolic parameters were measured after an overnight fast. Energy/macronutrient intake and inflammatory potential of dietary intake (as assessed via the Dietary Inflammatory IndexTM) were calculated for nurses' workdays, work nights, off-work days, and off-work nights. Work-night total food intake (grams) accounted for a significant amount of variance in CMS risk factors for night-shift nurses only. Increased total gram consumption during night-shift nurses' work nights was associated with increased lipid levels - independent of the macronutrient composition of the food consumed. Alternatively, for night-shift nurses, work-day intake of several food parameters accounted for a significant proportion of variance in HDL cholesterol levels, with higher intake associated with higher HDL levels. For both day- and night-shift nurses, food intake during the day was more pro-inflammatory regardless of shift type or work status. Our novel approach of combining time-of-day-specific and work-day-specific analyses of dietary inflammatory factors and macronutrient composition with measurement of CMS risk factors suggests a link between meal timing and cardiometabolic health for shift-working nurses.
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Affiliation(s)
- Hylton E Molzof
- a Department of Psychology , University of Alabama , Tuscaloosa , AL , USA
| | - Michael D Wirth
- b Cancer Prevention and Control Program, and Department of Epidemiology and Biostatistics , University of South Carolina , Columbia , SC , USA.,c Connecting Health Innovations , LLC , Columbia , SC , USA
| | - James B Burch
- b Cancer Prevention and Control Program, and Department of Epidemiology and Biostatistics , University of South Carolina , Columbia , SC , USA.,d WJB Dorn Department of Veterans Affairs Medical Center , Columbia , SC , USA
| | - Nitin Shivappa
- b Cancer Prevention and Control Program, and Department of Epidemiology and Biostatistics , University of South Carolina , Columbia , SC , USA.,c Connecting Health Innovations , LLC , Columbia , SC , USA
| | - James R Hebert
- b Cancer Prevention and Control Program, and Department of Epidemiology and Biostatistics , University of South Carolina , Columbia , SC , USA.,c Connecting Health Innovations , LLC , Columbia , SC , USA
| | - Russell L Johnson
- e Department of Psychiatry and Behavioral Neurobiology , University of Alabama at Birmingham , Birmingham , AL , USA
| | - Karen L Gamble
- e Department of Psychiatry and Behavioral Neurobiology , University of Alabama at Birmingham , Birmingham , AL , USA
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Tsang AH, Astiz M, Leinweber B, Oster H. Rodent Models for the Analysis of Tissue Clock Function in Metabolic Rhythms Research. Front Endocrinol (Lausanne) 2017; 8:27. [PMID: 28243224 PMCID: PMC5304405 DOI: 10.3389/fendo.2017.00027] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 01/30/2017] [Indexed: 11/30/2022] Open
Abstract
The circadian timing system consists on a distributed network of cellular clocks that together coordinate 24-h rhythms of physiology and behavior. Clock function and metabolism are tightly coupled, from the cellular to the organismal level. Genetic and non-genetic approaches in rodents have been employed to study circadian clock function in the living organism. Due to the ubiquitous expression of clock genes and the intricate interaction between the circadian system and energy metabolism, genetic approaches targeting specific tissue clocks have been used to assess their contribution in systemic metabolic processes. However, special requirements regarding specificity and efficiency have to be met to allow for valid conclusions from such studies. In this review, we provide a brief summary of different approaches developed for dissecting tissue clock function in the metabolic context in rodents, compare their strengths and weaknesses, and suggest new strategies in assessing tissue clock output and the consequences of circadian clock disruption in vivo.
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Affiliation(s)
- Anthony H. Tsang
- Chronophysiology Group, Medical Department I, University of Lübeck, Lübeck, Germany
- Department of Clinical Biochemistry, Institute of Metabolic Science, University of Cambridge, Cambridge, UK
| | - Mariana Astiz
- Chronophysiology Group, Medical Department I, University of Lübeck, Lübeck, Germany
| | - Brinja Leinweber
- Chronophysiology Group, Medical Department I, University of Lübeck, Lübeck, Germany
| | - Henrik Oster
- Chronophysiology Group, Medical Department I, University of Lübeck, Lübeck, Germany
- *Correspondence: Henrik Oster,
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Heath G, Coates A, Sargent C, Dorrian J. Sleep Duration and Chronic Fatigue Are Differently Associated with the Dietary Profile of Shift Workers. Nutrients 2016; 8:nu8120771. [PMID: 27916861 PMCID: PMC5188426 DOI: 10.3390/nu8120771] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 11/18/2016] [Accepted: 11/23/2016] [Indexed: 01/12/2023] Open
Abstract
Shift work has been associated with dietary changes. This study examined factors associated with the dietary profiles of shift workers from several industries (n = 118, 57 male; age = 43.4 ± 9.9 years) employed on permanent mornings, nights, or rotating 8-h or 12-h shifts. The dietary profile was assessed using a Food Frequency Questionnaire. Shift-related (e.g., sleep duration and fatigue), work-related (e.g., industry), and demographic factors (e.g., BMI) were measured using a modified version of the Standard Shift work Index. Mean daily energy intake was 8628 ± 3161 kJ. As a percentage of daily energy intake, all workers reported lower than recommended levels of carbohydrate (CHO, 45%–65%). Protein was within recommended levels (15%–25%). Permanent night workers were the only group to report higher than recommended fat intake (20%–35%). However, all workers reported higher than recommended levels of saturated fat (>10%) with those on permanent nights reporting significantly higher levels than other groups (Mean = 15.5% ± 3.1%, p < 0.05). Shorter sleep durations and decreased fatigue were associated with higher CHO intake (p ≤ 0.05) whereas increased fatigue and longer sleep durations were associated with higher intake of fat (p ≤ 0.05). Findings demonstrate sleep duration, fatigue, and shift schedule are associated with the dietary profile of shift workers.
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Affiliation(s)
- Georgina Heath
- Centre for Sleep Research, University of South Australia, Adelaide 5000, Australia.
| | - Alison Coates
- Alliance for Research in Exercise, University of South Australia, Nutrition and Activity, Adelaide 5000, Australia.
| | - Charli Sargent
- Appleton Institute for Behavioural Science, Central Queensland University, Wayville 5034, Australia.
| | - Jillian Dorrian
- Centre for Sleep Research, University of South Australia, Adelaide 5000, Australia.
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Mokarami H, Stallones L, Nazifi M, Taghavi SM. The role of psychosocial and physical work-related factors on the health-related quality of life of Iranian industrial workers. Work 2016; 55:441-452. [PMID: 27689588 DOI: 10.3233/wor-162405] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- Hamidreza Mokarami
- Department of Ergonomics, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Lorann Stallones
- Colorado Injury Control Research Center, Department of Psychology, Colorado State University, Fort Collins, CO, USA
| | - Morteza Nazifi
- Department of Psychology, University of Bojnord, Bojnord, Iran
| | - Sayed Mohammad Taghavi
- Kohkilouyeh & Boyer-Ahmad Health Care Management of Social Security Organization, Yasuj, Iran
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Rozov SV, Zant JC, Gurevicius K, Porkka-Heiskanen T, Panula P. Altered Electroencephalographic Activity Associated with Changes in the Sleep-Wakefulness Cycle of C57BL/6J Mice in Response to a Photoperiod Shortening. Front Behav Neurosci 2016; 10:168. [PMID: 27630549 PMCID: PMC5005378 DOI: 10.3389/fnbeh.2016.00168] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 08/17/2016] [Indexed: 11/13/2022] Open
Abstract
AIM Under natural conditions diurnal rhythms of biological processes of the organism are synchronized with each other and to the environmental changes by means of the circadian system. Disturbances of the latter affect hormonal levels, sleep-wakefulness cycle and cognitive performance. To study mechanisms of such perturbations animal models subjected to artificial photoperiods are often used. The goal of current study was to understand the effects of circadian rhythm disruption, caused by a short light-dark cycle regime, on activity of the cerebral cortex in rodents. METHODS We used electroencephalogram to assess the distribution of vigilance states, perform spectral analysis, and estimate the homeostatic sleep drive. In addition, we analyzed spontaneous locomotion of C57BL/6J mice under symmetric, 22-, 21-, and 20-h-long light-dark cycles using video recording and tracking methods. RESULTS AND CONCLUSIONS We found that shortening of photoperiod caused a significant increase of slow wave activity during non-rapid eye movement sleep suggesting an elevation of sleep pressure under such conditions. While the rhythm of spontaneous locomotion was completely entrained by all light-dark cycles tested, periodic changes in the power of the θ- and γ-frequency ranges during wakefulness gradually disappeared under 22- and 21-h-long light-dark cycles. This was associated with a significant increase in the θ-γ phase-amplitude coupling during wakefulness. Our results thus provide deeper understanding of the mechanisms underlying the impairment of learning and memory retention, which is associated with disturbed circadian regulation.
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Affiliation(s)
- Stanislav V Rozov
- Department of Anatomy, Faculty of Medicine, Neuroscience Center, University of Helsinki Helsinki, Finland
| | - Janneke C Zant
- Department of Physiology, Faculty of Medicine, University of Helsinki Helsinki, Finland
| | - Kestutis Gurevicius
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland Kuopio, Finland
| | | | - Pertti Panula
- Department of Anatomy, Faculty of Medicine, Neuroscience Center, University of Helsinki Helsinki, Finland
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Soreca I, Wallace ML, Hall MH, Hasler BP, Frank E, Kupfer DJ. The association between meal timing and frequency with cardiometabolic profile in patients with bipolar disorder. Acta Psychiatr Scand 2016; 133:453-8. [PMID: 27084394 DOI: 10.1111/acps.12578] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/07/2016] [Indexed: 12/14/2022]
Abstract
OBJECTIVE The goal of this study was to explore the association of timing of and frequency of meals with markers of cardiometabolic risk in patients with bipolar disorder in out-patient maintenance treatment. METHODS We used Pittsburgh Sleep Diary and actigraphy measures for individuals with bipolar I disorder. Linear and logistic regression analyses were used to determine whether dinnertime, instability of dinnertime, and/or interval between meals were associated with metabolic syndrome and its components. RESULTS Later dinnertime was associated with greater waist circumference (β = 0.25, P = 0.02) after adjusting for age, sex, dinner-to-bed interval, and sleep duration. Longer breakfast-to-lunch intervals were also associated with greater waist circumferences (β =-.35, P = .002) after adjusting for age, sex, and sleep duration. Neither instability of dinnertime nor number of meals per day was associated with the metabolic syndrome or its components. CONCLUSION Weight gain is often perceived as inevitable side-effect of medications. While patients often need to be on medication to function, a more careful lifestyle assessment with attention to social rhythms and timing of activities may be critical not only for mood stability, but also to reduce cardiovascular risk.
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Affiliation(s)
- I Soreca
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - M L Wallace
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - M H Hall
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - B P Hasler
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - E Frank
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - D J Kupfer
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
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49
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Walia HK, Mehra R. Overview of Common Sleep Disorders and Intersection with Dermatologic Conditions. Int J Mol Sci 2016; 17:E654. [PMID: 27144559 PMCID: PMC4881480 DOI: 10.3390/ijms17050654] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 04/21/2016] [Accepted: 04/22/2016] [Indexed: 01/12/2023] Open
Abstract
Sleep disorders are very common, often under-recognized and therefore undertreated, are associated with a myriad of medical conditions and could lead to significant impairment of quality of life. This review provides an up-to-date synopsis of common sleep disorders encompassing insufficient sleep syndrome, insomnia, circadian rhythm disorders and obstructive sleep apnea with a brief overview of epidemiology, screening, diagnostic testing and treatment. We also emphasize the emerging area of the intersection of sleep disorders and dermatologic conditions and present compelling data regarding underlying mechanisms including sleep dysfunction in relation to disorders of skin inflammation, aging and skin cancer.
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Affiliation(s)
- Harneet K Walia
- Center for Sleep Disorders Cleveland Clinic 11203, Stokes Blvd Cleveland, Cleveland, OH 44195, USA.
| | - Reena Mehra
- Center for Sleep Disorders Cleveland Clinic 11203, Stokes Blvd Cleveland, Cleveland, OH 44195, USA.
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50
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Rasoulzadeh Y, Bazazan A, Safaiyan A, Dianat I. Fatigue and Psychological Distress: A Case Study Among Shift Workers of an Iranian Petrochemical Plant, During 2013, in Bushehr. IRANIAN RED CRESCENT MEDICAL JOURNAL 2015; 17:e28021. [PMID: 26568862 PMCID: PMC4636754 DOI: 10.5812/ircmj.28021] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2015] [Revised: 06/28/2015] [Accepted: 07/21/2015] [Indexed: 11/25/2022]
Abstract
Background: Shift work is a well-recognized occupational health hazard in both industrialized and industrially developing countries. Prolonged working time, day/night shift rotation, circadian rhythm and sleep disorders, family and social problems are the most important features of shift working, which have serious complications. Objectives: The present study evaluated the fatigue and psychological distress and their relationship among shift workers, in a petrochemical plant (Southern Pars gas field) in Southwest Iran. Materials and Methods: In this cross-sectional field study, 400 shift workers from a plant were involved, with participation rate of 72.5% (290 persons). The multidimensional fatigue inventory (MFI-20) and general health questionnaire (GHQ-28) were used to evaluate the level of fatigue and psychological distress, respectively. Results: The results showed that the fatigue and psychological distress (particularly social dysfunction, anxiety and insomnia) are frequent among 12-hour shift workers (the total MFI and total GHQ scores were 42.68 ± 17.88 and 34.66 ± 18.56). A relatively strong positive correlation was found between fatigue and psychological distress (r = 0.62). The results of the stepwise regression model indicated that the psychological distress was significantly related only to general fatigue, mental fatigue and reduced motivation, whereas it was not to the physical fatigue and reduced activity. Conclusions: The study findings highlight the importance of the mental aspect of fatigue in this working group. These results have possible implications for workers’ health and well-being and for the design of shift work systems, for industrial workers.
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Affiliation(s)
- Yahya Rasoulzadeh
- Department of Occupational Health and Ergonomics, Faculty of Health, Tabriz University of Medical Sciences, Tabriz, IR Iran
| | - Ahmad Bazazan
- Department of Occupational Health and Ergonomics, Faculty of Health, Tabriz University of Medical Sciences, Tabriz, IR Iran
| | - Abdolrasoul Safaiyan
- Department of Vital Statistics and Epidemiology, Faculty of Health, Tabriz University of Medical Sciences, Tabriz, IR Iran
| | - Iman Dianat
- Department of Occupational Health and Ergonomics, Faculty of Health, Tabriz University of Medical Sciences, Tabriz, IR Iran
- Corresponding Author: Iman Dianat, Department of Occupational Health and Ergonomics, Faculty of Health, Tabriz University of Medical Sciences, Tabriz, IR Iran. Tel: +98-4113357580, Fax: +98-4113340634, E-mail:
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