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Clark AB, Coates AM, Davidson ZE, Bonham MP. Dietary Patterns under the Influence of Rotational Shift Work Schedules: A Systematic Review and Meta-Analysis. Adv Nutr 2023; 14:295-316. [PMID: 36805319 DOI: 10.1016/j.advnut.2023.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 12/08/2022] [Accepted: 01/18/2023] [Indexed: 02/04/2023] Open
Abstract
Workers employed in rotating shift schedules are at a higher metabolic risk compared with those in regular day and fixed shift schedules; however, the contribution of diet is unclear. This systematic review aimed to investigate how rotating shift work schedules affect dietary energy intake and dietary patterns compared with regular day and fixed shift schedules. In addition, intraperson energy intake and dietary pattern comparisons within rotating shift schedules were investigated. Database searches were conducted on MEDLINE, Cochrane, CINAHL, PSYCinfo, EMBASE, and Scopus, in addition to manual search of bibliographic references, to identify articles. Two separate meta-analyses compared dietary intake between day work and rotating shift work schedules and within the rotational shift work group (morning/day and night shifts). Differences in dietary patterns were synthesized narratively. Thirty-one studies (n = 18,196 participants) were included in the review, and meta-analyses were conducted with 24-hour mean energy intake data from 18 (n = 16,633 participants) and 7 (n = 327 participants) studies, respectively. The average 24-hour energy intake of rotating shift workers was significantly higher than that of workers in regular daytime schedules [weighted mean difference (WMD): 264 kJ; 95% confidence interval (CI): 70, 458 kJ; P < 0.008; I2 = 63%]. However, the mean difference in 24-hour energy intake between morning/day shifts compared with night shifts within rotational shift schedules was not statistically significant (WMD: 101 kJ; 95% CI: -651, 852 kJ; P = 0.79; I2 = 77%). Dietary patterns of rotating shift workers were different from those of day workers, showing irregular and more frequent meals, increased snacking/eating at night, consumption of fewer core foods, and more discretionary foods. This review highlights that dietary intake in rotational shift workers is potentially higher in calories and features different eating patterns as a consequence of rotating shift work schedules. This review was registered at PROSPERO as ID 182507.
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Affiliation(s)
- Angela B Clark
- Department of Nutrition, Dietetics and Food, Monash University, Melbourne, Victoria, Australia.
| | - Alison M Coates
- Alliance for Research in Exercise, Nutrition and Activity, University of South Australia, Adelaide, South Australia, Australia
| | - Zoe E Davidson
- Department of Nutrition, Dietetics and Food, Monash University, Melbourne, Victoria, Australia
| | - Maxine P Bonham
- Department of Nutrition, Dietetics and Food, Monash University, Melbourne, Victoria, Australia
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Meléndez-Fernández OH, Liu JA, Nelson RJ. Circadian Rhythms Disrupted by Light at Night and Mistimed Food Intake Alter Hormonal Rhythms and Metabolism. Int J Mol Sci 2023; 24:3392. [PMID: 36834801 PMCID: PMC9963929 DOI: 10.3390/ijms24043392] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 02/04/2023] [Accepted: 02/07/2023] [Indexed: 02/10/2023] Open
Abstract
Availability of artificial light and light-emitting devices have altered human temporal life, allowing 24-hour healthcare, commerce and production, and expanding social life around the clock. However, physiology and behavior that evolved in the context of 24 h solar days are frequently perturbed by exposure to artificial light at night. This is particularly salient in the context of circadian rhythms, the result of endogenous biological clocks with a rhythm of ~24 h. Circadian rhythms govern the temporal features of physiology and behavior, and are set to precisely 24 h primarily by exposure to light during the solar day, though other factors, such as the timing of meals, can also affect circadian rhythms. Circadian rhythms are significantly affected by night shift work because of exposure to nocturnal light, electronic devices, and shifts in the timing of meals. Night shift workers are at increased risk for metabolic disorder, as well as several types of cancer. Others who are exposed to artificial light at night or late mealtimes also show disrupted circadian rhythms and increased metabolic and cardiac disorders. It is imperative to understand how disrupted circadian rhythms alter metabolic function to develop strategies to mitigate their negative effects. In this review, we provide an introduction to circadian rhythms, physiological regulation of homeostasis by the suprachiasmatic nucleus (SCN), and SCN-mediated hormones that display circadian rhythms, including melatonin and glucocorticoids. Next, we discuss circadian-gated physiological processes including sleep and food intake, followed by types of disrupted circadian rhythms and how modern lighting disrupts molecular clock rhythms. Lastly, we identify how disruptions to hormones and metabolism can increase susceptibility to metabolic syndrome and risk for cardiovascular diseases, and discuss various strategies to mitigate the harmful consequences associated with disrupted circadian rhythms on human health.
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Rizza S, Luzi A, Mavilio M, Ballanti M, Massimi A, Porzio O, Magrini A, Hannemann J, Menghini R, Lehrke M, Staels B, Grant PJ, Boger RH, Marx N, Federici M. Alterations in Rev-ERBα/BMAL1 ratio and glycated hemoglobin in rotating shift workers: the EuRhythDia study. Acta Diabetol 2021; 58:1111-1117. [PMID: 33788000 PMCID: PMC8272695 DOI: 10.1007/s00592-021-01676-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 01/09/2021] [Indexed: 12/17/2022]
Abstract
OBJECTIVE To detect premature gluco-metabolic defects among night shift workers with disturbances in circadian rhythms. DESIGN AND METHODS We performed a hypothesis-generating, cross-sectional analysis of anthropometric, metabolic, lipid, and inflammation parameters, comparing active (a-NSW, n = 111) and former (f-NSW, n = 98) rotating night shift workers with diurnal workers (controls, n = 69). All participants were hospital nurses. We also evaluated the Pittsburgh Sleep Quality Index (PSQI) and assessed expression of transcription factors REV-ERBα and BMAL1 in peripheral blood mononuclear cells (PBMCs), as indicators of the molecular clock. RESULTS Both a-NSW and f-NSW participants had significantly higher glycated hemoglobin (HbA1c) and white blood cell counts (WBC) (p < 0.001 for both), PSQI global score (p = 0.001) and diastolic blood pressure levels (p = 0.024) compared with controls. Expression of REV-ERBα/BMAL1 RNA in PBMC was significantly higher in a-NSW (p = 0.05) than in f-NSW or control participants. Multivariate regression analysis showed that working status and PSQI were independent determinants of higher HbA1c levels (p < 0.001). CONCLUSIONS We demonstrated that young, healthy night shift workers show subclinical abnormalities in HbA1c and changes in peripheral clock gene expression.
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Affiliation(s)
- Stefano Rizza
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier, 100133, Rome, Italy
| | - Alessio Luzi
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier, 100133, Rome, Italy
| | - Maria Mavilio
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier, 100133, Rome, Italy
| | - Marta Ballanti
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier, 100133, Rome, Italy
| | - Arianna Massimi
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier, 100133, Rome, Italy
| | - Ottavia Porzio
- Department of Experimental Medicine, University of Rome Tor Vergata, Rome, Italy
| | - Andrea Magrini
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy
| | - Juliane Hannemann
- Institute of Clinical Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Rossella Menghini
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier, 100133, Rome, Italy
| | - Michael Lehrke
- Department of Cardiology, University Medical Center Aachen, Aachen, Germany
| | - Bart Staels
- Univ. Lille, INSERM, CHU Lille, Institut Pasteur de Lille, U1011 - EGID, F-59000, Lille, France
| | - Peter J Grant
- Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, England
| | - Rainer H Boger
- Institute of Clinical Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Nikolaus Marx
- Department of Cardiology, University Medical Center Aachen, Aachen, Germany
| | - Massimo Federici
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier, 100133, Rome, Italy.
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Night shift work, obesity and cardio-metabolic risk. ENDOCRINE AND METABOLIC SCIENCE 2020. [DOI: 10.1016/j.endmts.2020.100069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Rizza S, Longo S, Piciucchi G, Romanello D, Mavilio M, Montagna M, Coppeta L, Martelli E, Magrini A, Federici M. Carotid intimal medial thickness in rotating night shift is related to IL1β/IL6 axis. Nutr Metab Cardiovasc Dis 2020; 30:1826-1832. [PMID: 32665209 DOI: 10.1016/j.numecd.2020.05.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 05/24/2020] [Accepted: 05/27/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND AIMS Sleep disturbances may promote glucose abnormalities and inflammatory burden among shift workers. Therefore, precocious subclinical atherosclerotic process might develop in healthy shift workers even without known metabolic and cardiovascular risk factors. METHODS AND RESULTS We measured anthropometric parameters, glucose, lipids, inflammation and common carotid Intimal Medial Thickness (cIMT) in rotating-night shift workers (r-NSW, n = 88, age = 40.3 ± 7.8 y) in comparison with former-night shift workers (f-NSW, n = 35, age = 44.2 ± 6.4 y) and with day-only workers (DW, n = 64, age = 44.1 ± 8.9 y). R-NSW and f-NSW showed significantly higher cIMT and high sensitivity C-Reactive Protein (hs-CRP) respect to DW (p = 0.043 and p = 0.025, respectively). IL-1β levels were higher in r-NSW than in DW and f-NSW (p = 0.043) and significantly correlated with IL6 (r = 0.365, p < 0.001). In addition, r-NSW and f-NSW had higher HbA1c levels in comparison with DW (p = 0.047). Carotid-IMT was significantly related to night shift work (p = 0.023), with age (p < 0.001), with HOMA IR (p = 0.009), with insulin (p = 0.006) with HbA1c (p = 0.002), with LDL cholesterol (p < 0.001), with diastolic BP (p < 0.001), with WBC (p = 0.002) and with IL6 (p = 0.004). After performing a multivariate analysis night shift work remained statistically related to cIMT (B = 2.633, 95%CI = 0.489-4.776, p = 0.016). CONCLUSIONS Our result described a possible link bridging night shift work, inflammation and carotid Intimal Medial Thickness. Future studies are warranted to understand if carotid atherosclerosis process should be mainly driven by the IL1β/IL6 citokine axis connected to sleep disturbances.
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Affiliation(s)
- Stefano Rizza
- Department of Systems Medicine, University of Rome Tor Vergata, Italy.
| | - Susanna Longo
- Department of Systems Medicine, University of Rome Tor Vergata, Italy
| | - Giacomo Piciucchi
- Department of Systems Medicine, University of Rome Tor Vergata, Italy
| | - Daniele Romanello
- Department of Systems Medicine, University of Rome Tor Vergata, Italy
| | - Maria Mavilio
- Department of Systems Medicine, University of Rome Tor Vergata, Italy
| | - Martina Montagna
- Department of Systems Medicine, University of Rome Tor Vergata, Italy
| | - Luca Coppeta
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy
| | - Eugenio Martelli
- Division of Vascular Surgery, Department of Medical, Surgical, and Experimental Sciences, University of Sassari, Sassari, Italy
| | - Andrea Magrini
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy
| | - Massimo Federici
- Department of Systems Medicine, University of Rome Tor Vergata, Italy
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Dutheil F, Baker JS, Mermillod M, De Cesare M, Vidal A, Moustafa F, Pereira B, Navel V. Shift work, and particularly permanent night shifts, promote dyslipidaemia: A systematic review and meta-analysis. Atherosclerosis 2020; 313:156-169. [PMID: 33069952 DOI: 10.1016/j.atherosclerosis.2020.08.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 07/15/2020] [Accepted: 08/26/2020] [Indexed: 12/16/2022]
Abstract
BACKGROUND AND AIMS Shift work is common worldwide and linked to deleterious cardiovascular effects that might be underlined by dyslipidemia. The aim of this systematic review and meta-analysis is to determine the impact of shiftwork on dyslipidemia. METHODS Searching in PubMed, Cochrane Library, Science Direct and Embase databases without language restriction on 15 February 2020, included studies that describe blood lipids levels or a risk measure in shift workers compared with fixed-day workers (controls). Differences by study-level characteristics were estimated using stratified meta-analysis by type of shift work, and meta-regression to examine relations between dyslipidemia and demographic, lifestyle and work characteristics. Estimates were pooled using random-effect meta-analysis. RESULTS We included a total of 66 articles, representing 197,063 workers. Shift work globally increased the levels of triglycerides (overall SMD = 0.09; 95CI 0.05 to 0.13; p < 0.001), and globally decreased the levels of c-HDL (-0.08; 95CI -0.12 to -0.03; p = 0.001). Permanent night shift workers were an at-risk type of shift for dyslipidemia with significantly higher blood levels of total cholesterol (0.22; 95CI 0.01 to 0.42; p = 0.043) and triglycerides (0.18; 0.03 to 0.33; p = 0.017), and significantly lower blood levels of c-HDL (-0.16; 95CI -0.32 to 0.00; p = 0.05). Permanent night shift workers were more at-risk for total cholesterol than rotating 3 × 8 shift workers (Coefficient 0.22; 95CI 0.01 to 0.42; p = 0.038) and rotating 2 × 12 shift workers (0.24; 0.02 to 0.46; p = 0.037), and more at-risk for triglycerides than rotating day shift workers (0.21; 95CI 0.03 to 0.38; p = 0.023). Results were non-significant for c-LDL, nor depending on type of shifts. CONCLUSIONS Shift work, and particularly permanent night shift, is associated with dyslipidaemia via elevated total cholesterol and triglycerides, and reduced HDL-cholesterol. Our current study provides a practical and valuable strengthening of the evidence-base required for preventive health initiatives and workplace reform.
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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, Witty Fit, F-63000, 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
| | - Martial Mermillod
- Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, LPNC, Grenoble, France; Institut Universitaire de France, Paris, France
| | - Mélanie De Cesare
- CHU Clermont-Ferrand, University Hospital of Clermont-Ferrand, Preventive and Occupational Medicine, F-63000, Clermont-Ferrand, France
| | - Alexia Vidal
- CHU Clermont-Ferrand, University Hospital of Clermont-Ferrand, Preventive and Occupational Medicine, F-63000, Clermont-Ferrand, France
| | - Fares Moustafa
- CHU Clermont-Ferrand, University Hospital of Clermont-Ferrand, Emergency Unit, F-63000, Clermont-Ferrand, France
| | - Bruno Pereira
- University Hospital of Clermont-Ferrand (CHU), Clinical Research and Innovation Direction, Clermont-Ferrand, France
| | - Valentin Navel
- Université Clermont Auvergne, CNRS, INSERM, GReD, Translational Approach to Epithelial Injury and Repair, CHU Clermont-Ferrand, University Hospital of Clermont-Ferrand, Ophthalmology, F-63000, Clermont-Ferrand, France
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Cayanan EA, Eyre NAB, Lao V, Comas M, Hoyos CM, Marshall NS, Phillips CL, Shiao JSC, Guo YLL, Gordon CJ. Is 24-hour energy intake greater during night shift compared to non-night shift patterns? A systematic review. Chronobiol Int 2019; 36:1599-1612. [DOI: 10.1080/07420528.2019.1666865] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Elizabeth A. Cayanan
- Susan Wakil School of Nursing and Midwifery, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
- CIRUS, Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, The University of Sydney, Sydney, Australia
- NeuroSleep, National Health and Medical Research Council Centre of Research Excellence, Sydney, Australia
| | - Nadine A. B. Eyre
- Susan Wakil School of Nursing and Midwifery, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - Vickie. Lao
- Susan Wakil School of Nursing and Midwifery, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - Maria Comas
- CIRUS, Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, The University of Sydney, Sydney, Australia
- Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - Camilla M. Hoyos
- CIRUS, Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, The University of Sydney, Sydney, Australia
- School of Psychology, Faculty of Science, The University of Sydney, Sydney, NSW, Australia
- Healthy Brain Ageing Program, Brain and Mind Centre, Charles Perkins Centre, University of Sydney, Sydney, Australia
| | - Nathaniel S. Marshall
- Susan Wakil School of Nursing and Midwifery, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
- CIRUS, Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, The University of Sydney, Sydney, Australia
- NeuroSleep, National Health and Medical Research Council Centre of Research Excellence, Sydney, Australia
| | - Craig L. Phillips
- CIRUS, Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, The University of Sydney, Sydney, Australia
- Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
- Sydney Health Partners (Sleep and Respiratory Department, Royal North Shore Hospital), Sydney, Australia
| | - Judy S. C. Shiao
- Department of Nursing, College of Medicine National Taiwan University & National Taiwan Hospital, Taipei, Taiwan
| | - Yue-Liang Leon Guo
- Department of Environmental and Occupational Medicine, National Taiwan University & National Taiwan Hospital, Taipei, Taiwan
| | - Christopher J. Gordon
- Susan Wakil School of Nursing and Midwifery, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
- CIRUS, Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, The University of Sydney, Sydney, Australia
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Holst MM, Wirth MD, Mnatsakanova A, Burch JB, Charles LE, Tinney-Zara C, Fekedulegn D, Andrew ME, Hartley TA, Violanti JM. Shiftwork and Biomarkers of Subclinical Cardiovascular Disease: The BCOPS Study. J Occup Environ Med 2019; 61:391-396. [PMID: 30649009 PMCID: PMC6610651 DOI: 10.1097/jom.0000000000001541] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To assess the association of shiftwork with biomarkers of subclinical cardiovascular disease and examine the moderating role of body mass index (BMI) in a police cohort. METHODS A cross-sectional analysis was conducted among officers who were categorized as working the day, evening, or night shift. Comparisons with inflammatory biomarkers were performed among shifts using analysis of variance/covariance and further stratified by BMI to assess potential effect modification. RESULTS Associations were observed between day and night shiftworkers for leukocytes, tumor necrosis factor alpha, and homocysteine. After BMI stratification, higher c-reactive protein (CRP) levels were observed among evening shiftworkers with a BMI more than or equal to 30 kg/m versus the day shift. CONCLUSIONS Future studies examining prospective changes in these markers will allow for more comprehensive evaluation of their association with shiftwork.
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Affiliation(s)
- Meghan M. Holst
- Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
| | - Michael D. Wirth
- Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
- Cancer Prevention and Control Program, University of South Carolina, Columbia, SC USA
- College of Nursing, University of South Carolina, Columbia, SC, USA
| | - Anna Mnatsakanova
- Biostatistics and Epidemiology Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV, USA
| | - James B. Burch
- Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
- Cancer Prevention and Control Program, University of South Carolina, Columbia, SC USA
- WJB Dorn VA Medical Center, Columbia, SC, USA
| | - Luenda E. Charles
- Biostatistics and Epidemiology Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV, USA
| | - Cathy Tinney-Zara
- Biostatistics and Epidemiology Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV, USA
| | - Desta Fekedulegn
- Biostatistics and Epidemiology Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV, USA
| | - Michael E. Andrew
- Biostatistics and Epidemiology Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV, USA
| | - Tara A. Hartley
- Biostatistics and Epidemiology Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV, USA
| | - John M. Violanti
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University of Buffalo, The State University of New York, Buffalo, NY, USA
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Bonham MP, Kaias E, Huggins CE, Davis R, Leung GK, Eikelis N, Shaw E, Murgia C. Effects of macronutrient manipulation on postprandial metabolic responses in overweight males with high fasting lipids during simulated shift work: A randomized crossover trial. Clin Nutr 2019; 39:369-377. [PMID: 30853262 DOI: 10.1016/j.clnu.2019.02.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 02/08/2019] [Accepted: 02/09/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS Meals consumed out of synchronisation with normal circadian rhythms are associated with metabolic dysregulation. Changes in macronutrient composition of meals can improve metabolic responses during the day. Therefore, we aimed to investigate whether macronutrient manipulation of meals alters postprandial glucose and lipid responses and the expression of circadian genes during the night. METHODS In a randomised crossover trial, 16 overweight males with high fasting lipids were fed isocaloric meals (2.7 MJ) at 0000 h. The meals differed primarily in total fat and total sugars content (control (8% total sugar, 5% saturated fat) vs test (16% total sugar, 26% saturated fat)). Postprandial blood samples were collected for glucose, insulin (3 h) and triglycerides (6 h) and analysed as incremental area under the curve (iAUC). RNA was extracted at 0 h, 2 h and 4 h and changes in expressions of the circadian genes clock and Per 1-3 analysed. RESULTS Postprandial glucose (p = 0.04) and insulin iAUC (p = 0.02) were significantly higher after consumption of the test meal compared to the control meal. Postprandial triglyceride iAUC was not statistically different between the two meal types (p = 0.72). No change in circadian gene expression was observed after the two meals. CONCLUSIONS Our results showed that macronutrient composition affects postprandial metabolic response at night. It emphasizes the need to consider the role and effects of night time eating, when developing metabolic disease prevention strategies for shift workers. STUDY ID NUMBER ACTRN12618001115224. WEBSITE OF TRIAL REGISTRY: http://www.anzctr.org.au/. Retrospectively registered after data collection.
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Affiliation(s)
- Maxine P Bonham
- Department of Nutrition, Dietetics and Food, Monash University, Notting Hill, Victoria, 3168, Australia.
| | - Elleni Kaias
- Department of Nutrition, Dietetics and Food, Monash University, Notting Hill, Victoria, 3168, Australia.
| | - Catherine E Huggins
- Department of Nutrition, Dietetics and Food, Monash University, Notting Hill, Victoria, 3168, Australia.
| | - Rochelle Davis
- Department of Nutrition, Dietetics and Food, Monash University, Notting Hill, Victoria, 3168, Australia.
| | - Gloria Kw Leung
- Department of Nutrition, Dietetics and Food, Monash University, Notting Hill, Victoria, 3168, Australia.
| | - Nina Eikelis
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Hawthorn, Victoria, Australia; Baker Heart and Diabetes Institute, Melbourne, Victoria, Australia.
| | - Emma Shaw
- Department of Nutrition, Dietetics and Food, Monash University, Notting Hill, Victoria, 3168, Australia.
| | - Chiara Murgia
- Department of Nutrition, Dietetics and Food, Monash University, Notting Hill, Victoria, 3168, Australia.
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10
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Christie S, Vincent AD, Li H, Frisby CL, Kentish SJ, O'Rielly R, Wittert GA, Page AJ. A rotating light cycle promotes weight gain and hepatic lipid storage in mice. Am J Physiol Gastrointest Liver Physiol 2018; 315:G932-G942. [PMID: 30188750 DOI: 10.1152/ajpgi.00020.2018] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Processes involved in regulation of energy balance and intermediary metabolism are aligned to the light-dark cycle. Shift-work and high-fat diet (HFD)-induced obesity disrupt circadian rhythmicity and are associated with increased risk of nonalcoholic fatty liver disease. This study aimed to determine the effect of simulating shift work on hepatic lipid accumulation in lean and HFD mice. C57BL/6 mice fed a standard laboratory diet (SLD) or HFD for 4 wk were further allocated to a normal light (NL) cycle (lights on: 0600-1800) or rotating light (RL) cycle [3 days NL and 4 days reversed (lights on: 1800-0600) repeated] for 8 wk. Tissue was collected every 3 h beginning at 0600. HFD mice gained more weight than SLD mice, and RL mice gained more weight than NL mice. SLD-NL and HFD-NL mice, but not RL mice, were more active, had higher respiratory quotients, and consumed/expended more energy during the dark phase compared with the light phase. Blood glucose and plasma cholesterol and triglyceride concentrations were elevated in HFD and SLD-RL compared with SLD-NL mice. Hepatic glycogen was elevated in HFD compared with SLD mice. Hepatic triglycerides were elevated in SLD-RL and HFD mice compared with SLD-NL. Circadian rhythmicity of hepatic acetyl-CoA carboxylase (ACACA) mRNA was phase shifted in SLD-RL and HFD-NL and lost in HFD-RL mice. Hepatic ACACA protein was reduced in SLD-RL and HFD mice compared with SLD-NL mice. Hepatic adipose triglyceride lipase was elevated in HFD-NL compared with SLD-NL but lower in RL mice compared with NL mice irrespective of diet. In conclusion, an RL cycle model of shift work promotes weight gain and hepatic lipid storage even in lean conditions. NEW & NOTEWORTHY In this publication we describe the effects of a rotating light cycle model of shift work in lean and high-fat diet-induced obese mice on body mass, diurnal patterns of energy intake and expenditure, and hepatic lipid storage. The data indicate that modeling shift work, via a rotating light cycle, promotes weight gain and hepatic lipid accumulation even in mice on a standard laboratory diet.
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Affiliation(s)
- Stewart Christie
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Adelaide Medical School, University of Adelaide , Adelaide, South Australia
| | - Andrew D Vincent
- Freemasons Foundation Centre for Men's Health, Adelaide Medical School, University of Adelaide , Adelaide, South Australia.,Nutrition and Metabolism, South Australian Health and Medical Research Institute , Adelaide, South Australia
| | - Hui Li
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Adelaide Medical School, University of Adelaide , Adelaide, South Australia.,Nutrition and Metabolism, South Australian Health and Medical Research Institute , Adelaide, South Australia
| | - Claudine L Frisby
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Adelaide Medical School, University of Adelaide , Adelaide, South Australia
| | - Stephen J Kentish
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Adelaide Medical School, University of Adelaide , Adelaide, South Australia
| | - Rebecca O'Rielly
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Adelaide Medical School, University of Adelaide , Adelaide, South Australia
| | - Gary A Wittert
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Adelaide Medical School, University of Adelaide , Adelaide, South Australia.,Freemasons Foundation Centre for Men's Health, Adelaide Medical School, University of Adelaide , Adelaide, South Australia.,Nutrition and Metabolism, South Australian Health and Medical Research Institute , Adelaide, South Australia
| | - Amanda J Page
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Adelaide Medical School, University of Adelaide , Adelaide, South Australia.,Nutrition and Metabolism, South Australian Health and Medical Research Institute , Adelaide, South Australia
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11
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Wrzosek M, Wojnar M, Sawicka A, Tałałaj M, Nowicka G. Insomnia and depressive symptoms in relation to unhealthy eating behaviors in bariatric surgery candidates. BMC Psychiatry 2018; 18:153. [PMID: 29843671 PMCID: PMC5972435 DOI: 10.1186/s12888-018-1734-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 05/11/2018] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Alongside obesity, insomnia and depression are common public health problems. Sleep problems are currently believed to be associated with excessive food intake and metabolic disturbances. Therefore, we aimed to explore a relationship between insomnia, depressive symptoms and eating habits as well as metabolic parameters in bariatric surgery candidates. METHODS A total of 361 unrelated obese subjects were included in this study. Severity of sleep problems was measured with Athens Insomnia Scale (AIS) and the severity of depressive symptoms was assessed with the Beck Depression Inventory (BDI-II). Obstructive sleep apnea (OSA) was assessed by the Apnea Hypopnoea Index (AHI). Information was obtained about demographics, eating habits and lifestyle. Blood samples were collected to measure concentration of lipids (cholesterol, triglyceride, HDL-cholesterol, LDL-cholesterol), and glucose. RESULTS The median (interquartile range) score for AIS in the study participants was 5 (3-8) with a range of 0-24 and 47% (171) participants scored ≥6 (met criteria for diagnosis of insomnia). Statistically significant correlations were found between the AIS scores and serum triglycerides and glucose concentrations, and BDI-II total scores. The highest scores on AIS and BDI-II were found in participants with high frequency of snack food consumption, in physically inactive individuals as well as in those who self-reported eating at night or who declared more than 3 intense emotions associated with a desire-to-eat. Adjusted multivariate logistic regression analysis revealed that clinical insomnia was most strongly associated with daily consumption of snack foods, with the odds ratio of 3.26 (95% CI: 1.74-6.11), while depressive symptoms were strongly associated with both eating in response to ≥3 specific emotions with OR = 2.93 (95% CI: 1.26-6.78) as well as with daily consumption of snack foods with OR = 2.87 (95% CI: 1.16-5.14). CONCLUSIONS The results indicate that insomnia and depression in obese individuals are associated with eating habits, and suggest that in some patients these associations appears as major factors affecting obesity development.
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Affiliation(s)
- Małgorzata Wrzosek
- Department of Biochemistry and Pharmacogenomics, and Center for Preclinical Studies, Medical University of Warsaw, Banacha 1, 02–097 Warsaw, Poland
| | - Marcin Wojnar
- Department of Psychiatry, Medical University of Warsaw, Warsaw, Poland
| | - Ada Sawicka
- Department of Geriatrics, Internal Medicine and Metabolic Bone Diseases, Medical Centre of Postgraduate Education, Prof. W. Orlowski Hospital, Warsaw, Poland
| | - Marek Tałałaj
- Department of Geriatrics, Internal Medicine and Metabolic Bone Diseases, Medical Centre of Postgraduate Education, Prof. W. Orlowski Hospital, Warsaw, Poland
| | - Grażyna Nowicka
- Department of Biochemistry and Pharmacogenomics, and Center for Preclinical Studies, Medical University of Warsaw, Banacha 1, 02–097 Warsaw, Poland
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12
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Su Y, Foppen E, Mansur Machado FS, Fliers E, Kalsbeek A. The role of the daily feeding rhythm in the regulation of the day/night rhythm in triglyceride secretion in rats. Chronobiol Int 2018; 35:885-895. [PMID: 29446660 DOI: 10.1080/07420528.2018.1438456] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Plasma triglyceride (TG) levels show a clear daily rhythm, however, thus far it is still unknown whether this rhythm results from a daily rhythm in TG production, TG uptake or both. Previous studies have shown that feeding activity affects plasma TG concentrations, but it is not clear how the daily rhythm in feeding activity affects plasma TG concentrations. In the present study, we measured plasma TG concentrations and TG secretion rates in rats at 6 Zeitgeber times to investigate whether plasma TG concentrations and TG secretion show a daily rhythm. We found that plasma TG concentrations and TG secretion show a significant day/night rhythm. Next, we removed the daily rhythm in feeding behavior by introducing a 6-meals-a-day (6M) feeding schedule to investigate whether the daily rhythm in feeding behavior is necessary to maintain the daily rhythm in TG secretion. We found that the day/night rhythm in TG secretion was abolished under 6M feeding conditions. Hepatic apolipoprotein B (ApoB) and microsomal TG transfer protein (Mttp), which are both involved in TG secretion, also lost their daily rhythmicity under 6M feeding conditions. Together, these results indicate that: (1) the daily rhythm in TG secretion contributes to the formation of a day/night rhythm in plasma TG levels and (2) a daily feeding rhythm is essential for maintaining the daily rhythm in TG secretion.
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Affiliation(s)
- Yan Su
- a Hypothalamic Integration Mechanisms , Netherlands Institute for Neuroscience , Amsterdam , The Netherlands
| | - Ewout Foppen
- b Department of Endocrinology and Metabolism , Academic Medical Center (AMC), University of Amsterdam , Amsterdam , The Netherlands
| | | | - Eric Fliers
- b Department of Endocrinology and Metabolism , Academic Medical Center (AMC), University of Amsterdam , Amsterdam , The Netherlands
| | - Andries Kalsbeek
- a Hypothalamic Integration Mechanisms , Netherlands Institute for Neuroscience , Amsterdam , The Netherlands.,b Department of Endocrinology and Metabolism , Academic Medical Center (AMC), University of Amsterdam , Amsterdam , The Netherlands
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13
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Farahmand S, Vafaeian M, Vahidi E, Abdollahi A, Bagheri-Hariri S, Dehpour AR. Comparison of exogenous melatonin versus placebo on sleep efficiency in emergency medicine residents working night shifts: A randomized trial. World J Emerg Med 2018; 9:282-287. [PMID: 30181797 DOI: 10.5847/wjem.j.1920-8642.2018.04.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Sleep deprivation resulting from night shifts, is a major cause of burnout among physicians. Exogenous melatonin may improve sleep quality in night-shift workers. The study aims to compare the effectiveness of melatonin versus placebo on sleep efficiency in emergency medicine (EM) residents. METHODS A randomized, double-blind, replicated crossover trial was performed on EM residents. This study consisted of 4 phases within a month with intervention periods of 2 nights and washouts of 6 days. In our study, EM residents had nine-hour shifts on 6 consecutive days, 2 mornings, 2 evenings and 2 nights and then 2 days off. At the end of shifts' cycle, 24 EM residents were given 3 mg melatonin or placebo (12 in each arm of the study) for 2 consecutive nights after the second night shift with crossover to the other arm after a six-day off drug. This crossover intervention was repeated for two more another time. Finally, we created 48 cases and comparisons in each arm. Different items related to sleep quality were assessed and compared both within the same group and between the two groups. RESULTS In the melatonin group, daytime sleepiness (calculated by Karolinska Sleep Scale) had a significant reduction after taking the second dose of drug (P=0.003) but the same result was not observed when comparing the 2 groups. Mood status (calculated by Profile of Mood States) showed no remarkable difference between the 2 groups. CONCLUSION Melatonin might have a limited benefit on sleep quality in EM residents working night shifts.
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Affiliation(s)
- Shervin Farahmand
- Emergency Medicine Department, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Masoume Vafaeian
- Emergency Medicine Department, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Elnaz Vahidi
- Emergency Medicine Department, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Atefeh Abdollahi
- Emergency Medicine Department, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Shahram Bagheri-Hariri
- Emergency Medicine Department, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Ahmad Reza Dehpour
- Department of Pharmacology, Tehran University of Medical Sciences, Tehran, Iran
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14
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Barger LK, Rajaratnam SMW, Cannon CP, Lukas MA, Im K, Goodrich EL, Czeisler CA, O'Donoghue ML. Short Sleep Duration, Obstructive Sleep Apnea, Shiftwork, and the Risk of Adverse Cardiovascular Events in Patients After an Acute Coronary Syndrome. J Am Heart Assoc 2017; 6:JAHA.117.006959. [PMID: 29018021 PMCID: PMC5721882 DOI: 10.1161/jaha.117.006959] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Background It is unknown whether short sleep duration, obstructive sleep apnea, and overnight shift work are associated with the risk of recurrent cardiovascular events in patients after an acute coronary syndrome. Methods and Results SOLID‐TIMI 52 (The Stabilization of PLaques UsIng Darapladib‐Thrombolysis in Myocardial Infarction 52 Trial) was a multinational, double‐blind, placebo‐controlled trial that enrolled 13 026 patients ≤30 days of acute coronary syndrome. At baseline, all patients were to complete the Berlin questionnaire to assess risk of obstructive sleep apnea and a sleep and shift work survey. Median follow‐up was 2.5 years. The primary outcome was major coronary events (MCE; coronary heart disease death, myocardial infarction, or urgent revascularization). Cox models were adjusted for clinical predictors. Patients who reported <6 hours sleep per night had a 29% higher risk of MCE (adjusted hazard ratio, 1.29; 95% confidence interval, 1.12–1.49; P<0.001) compared with those with longer sleep. Patients who screened positive for obstructive sleep apnea had a 12% higher risk of MCE (1.12; 1.00–1.24; P=0.04) than those who did not screen positive. Overnight shift work (≥3 night shifts/week for ≥1 year) was associated with a 15% higher risk of MCE (1.15; 1.03–1.29; P=0.01). A step‐wise increase in cardiovascular risk was observed for individuals with more than 1 sleep‐related risk factor. Individuals with all 3 sleep‐related risk factors had a 2‐fold higher risk of MCE (2.01; 1.49–2.71; P<0.0001). Conclusions Short sleep duration, obstructive sleep apnea, and overnight shift work are under‐recognized as predictors of adverse outcomes after acute coronary syndrome. Increased efforts should be made to identify, treat, and educate patients about the importance of sleep for the potential prevention of cardiovascular events. Clinical Trial Registration URL: http://www.clinicaltrials.gov. Unique identifier: NCT01000727.
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Affiliation(s)
- Laura K Barger
- Sleep Health Institute and Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women's Hospital, Boston, MA .,Division of Sleep Medicine, Harvard Medical School, Boston, MA.,Monash Institute of Cognitive and Clinical Neurosciences and School of Psychological Sciences, Monash University, Clayton, Victoria, Australia
| | - Shantha M W Rajaratnam
- Sleep Health Institute and Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women's Hospital, Boston, MA.,Division of Sleep Medicine, Harvard Medical School, Boston, MA.,Monash Institute of Cognitive and Clinical Neurosciences and School of Psychological Sciences, Monash University, Clayton, Victoria, Australia
| | - Christopher P Cannon
- Thrombolysis in Myocardial Infarction (TIMI) Study Group, Cardiovascular Division, Brigham and Women's Hospital Harvard Medical School, Boston, MA
| | - Mary Ann Lukas
- Metabolic Pathways and Cardiovascular Therapeutic Area, GlaxoSmithKline, Philadelphia, PA
| | - KyungAh Im
- Thrombolysis in Myocardial Infarction (TIMI) Study Group, Cardiovascular Division, Brigham and Women's Hospital Harvard Medical School, Boston, MA
| | - Erica L Goodrich
- Thrombolysis in Myocardial Infarction (TIMI) Study Group, Cardiovascular Division, Brigham and Women's Hospital Harvard Medical School, Boston, MA
| | - Charles A Czeisler
- Sleep Health Institute and Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women's Hospital, Boston, MA.,Division of Sleep Medicine, Harvard Medical School, Boston, MA
| | - Michelle L O'Donoghue
- Thrombolysis in Myocardial Infarction (TIMI) Study Group, Cardiovascular Division, Brigham and Women's Hospital Harvard Medical School, Boston, MA
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15
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Potter GDM, Skene DJ, Arendt J, Cade JE, Grant PJ, Hardie LJ. Circadian Rhythm and Sleep Disruption: Causes, Metabolic Consequences, and Countermeasures. Endocr Rev 2016; 37:584-608. [PMID: 27763782 PMCID: PMC5142605 DOI: 10.1210/er.2016-1083] [Citation(s) in RCA: 300] [Impact Index Per Article: 37.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Circadian (∼24-hour) timing systems pervade all kingdoms of life and temporally optimize behavior and physiology in humans. Relatively recent changes to our environments, such as the introduction of artificial lighting, can disorganize the circadian system, from the level of the molecular clocks that regulate the timing of cellular activities to the level of synchronization between our daily cycles of behavior and the solar day. Sleep/wake cycles are intertwined with the circadian system, and global trends indicate that these, too, are increasingly subject to disruption. A large proportion of the world's population is at increased risk of environmentally driven circadian rhythm and sleep disruption, and a minority of individuals are also genetically predisposed to circadian misalignment and sleep disorders. The consequences of disruption to the circadian system and sleep are profound and include myriad metabolic ramifications, some of which may be compounded by adverse effects on dietary choices. If not addressed, the deleterious effects of such disruption will continue to cause widespread health problems; therefore, implementation of the numerous behavioral and pharmaceutical interventions that can help restore circadian system alignment and enhance sleep will be important.
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Affiliation(s)
- Gregory D M Potter
- Division of Epidemiology and Biostatistics (G.D.M.P., L.J.H.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom; Chronobiology Section (D.J.S., J.A.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom; Nutritional Epidemiology Group (J.E.C.), School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, United Kingdom; and Division of Cardiovascular & Diabetes Research (P.J.G.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Debra J Skene
- Division of Epidemiology and Biostatistics (G.D.M.P., L.J.H.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom; Chronobiology Section (D.J.S., J.A.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom; Nutritional Epidemiology Group (J.E.C.), School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, United Kingdom; and Division of Cardiovascular & Diabetes Research (P.J.G.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Josephine Arendt
- Division of Epidemiology and Biostatistics (G.D.M.P., L.J.H.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom; Chronobiology Section (D.J.S., J.A.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom; Nutritional Epidemiology Group (J.E.C.), School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, United Kingdom; and Division of Cardiovascular & Diabetes Research (P.J.G.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Janet E Cade
- Division of Epidemiology and Biostatistics (G.D.M.P., L.J.H.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom; Chronobiology Section (D.J.S., J.A.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom; Nutritional Epidemiology Group (J.E.C.), School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, United Kingdom; and Division of Cardiovascular & Diabetes Research (P.J.G.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Peter J Grant
- Division of Epidemiology and Biostatistics (G.D.M.P., L.J.H.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom; Chronobiology Section (D.J.S., J.A.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom; Nutritional Epidemiology Group (J.E.C.), School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, United Kingdom; and Division of Cardiovascular & Diabetes Research (P.J.G.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Laura J Hardie
- Division of Epidemiology and Biostatistics (G.D.M.P., L.J.H.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom; Chronobiology Section (D.J.S., J.A.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom; Nutritional Epidemiology Group (J.E.C.), School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, United Kingdom; and Division of Cardiovascular & Diabetes Research (P.J.G.), LIGHT Laboratories, University of Leeds, Leeds LS2 9JT, United Kingdom
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16
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Haus E, Reinberg A, Mauvieux B, Le Floc’h N, Sackett-Lundeen L, Touitou Y. Risk of obesity in male shift workers: A chronophysiological approach. Chronobiol Int 2016; 33:1018-36. [DOI: 10.3109/07420528.2016.1167079] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Erhard Haus
- Department of Laboratory Medicine & Pathology, University of Minnesota, HealthPartners Institute for Education and Research, Minneapolis, MN, USA
- Department of Pathology, Regions Hospital, St. Paul, MN, USA
| | - Alain Reinberg
- Unité de Chronobiologie, Fondation A. de Rothschild, Paris, France
| | - Benoît Mauvieux
- Attention, Orientation, and Chronobiology, INSERM ERI27, EA 3917, Université Caen Basse Normandie, Caen, France
| | - Nadine Le Floc’h
- Psychologie des Ages de la Vie, EA 2114, Université F. Rabelais, Tours, France
| | - Linda Sackett-Lundeen
- Department of Laboratory Medicine & Pathology, University of Minnesota, HealthPartners Institute for Education and Research, Minneapolis, MN, USA
- Department of Pathology, Regions Hospital, St. Paul, MN, USA
| | - Yvan Touitou
- Unité de Chronobiologie, Fondation A. de Rothschild, Paris, France
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17
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Bonham MP, Bonnell EK, Huggins CE. Energy intake of shift workers compared to fixed day workers: A systematic review and meta-analysis. Chronobiol Int 2016; 33:1086-100. [DOI: 10.1080/07420528.2016.1192188] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Maxine P. Bonham
- Department of Nutrition and Dietetics, Monash University, Melbourne, Victoria, Australia
| | - Emily K. Bonnell
- Department of Nutrition and Dietetics, Monash University, Melbourne, Victoria, Australia
| | - Catherine E. Huggins
- Department of Nutrition and Dietetics, Monash University, Melbourne, Victoria, Australia
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18
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Copin N, Gusto G, Vol S, Rollier S, Lantieri O, Lasfargues G, Tichet J. Perturbation du métabolisme lipidique chez des travailleurs postés consultants de centres d’examens de santé. Presse Med 2016; 45:e145-56. [DOI: 10.1016/j.lpm.2015.12.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 10/19/2015] [Accepted: 12/17/2015] [Indexed: 12/29/2022] Open
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19
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Ribeiro-Silva N, Nejm MB, da Silva SMA, Suchecki D, Luz J. Restriction of rapid eye movement sleep during adolescence increases energy gain and metabolic efficiency in young adult rats. Exp Physiol 2016; 101:308-18. [PMID: 26663203 DOI: 10.1113/ep085323] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 12/03/2015] [Indexed: 12/15/2022]
Abstract
NEW FINDINGS What is the central question of this study? Sleep curtailment in infancy and adolescence may lead to long-term risk for obesity, but the mechanisms involved have not yet been determined. This study examined the immediate and long-term metabolic effects produced by sleep restriction in young rats. What is the main finding and its importance? Prolonged sleep restriction reduced weight gain (body fat stores) in young animals. After prolonged recovery, sleep-restricted rats tended to save more energy and to store more fat, possibly owing to increased gross food efficiency. This could be the first step to understand this association. Sleep curtailment is associated with obesity and metabolic changes in adults and children. The aim of the present study was to evaluate the immediate and long-term metabolic alterations produced by sleep restriction in pubertal male rats. Male Wistar rats (28 days old) were allocated to a control (CTL) group or a sleep-restricted (SR) group. This was accomplished by the single platform technique for 18 h per day for 21 days. These groups were subdivided into the following four time points for assessment: sleep restriction and 1, 2 and 4 months of recovery. Body weight and food intake were monitored throughout the experiment. At the end of each time period, blood was collected for metabolic profiling, and the carcasses were processed for measurement of body composition and energy balance. During the period of sleep restriction, SR animals consumed less food in the home cages. This group also displayed lower body weight, body fat, triglycerides and glucose levels than CTL rats. At the end of the first month of recovery, despite eating as much as CTL rats, SR animals showed greater energy and body weight gain, increased gross food efficiency and decreased energy expenditure. At the end of the second and fourth months of recovery, the groups were no longer different, except for energy gain and gross food efficiency, which remained higher in SR animals. In conclusion, sleep restriction affected weight gain of young animals, owing to reduction of fat stores. Two months were sufficient to recover this deficit and to reveal that SR rats tended to save more energy and to store more fat.
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Affiliation(s)
- Neila Ribeiro-Silva
- Department of Physiology, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Mariana Bocca Nejm
- Department of Physiology, Universidade Federal de São Paulo, São Paulo, Brazil
| | | | - Deborah Suchecki
- Department of Psychobiology, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Jacqueline Luz
- Department of Physiology, Universidade Federal de São Paulo, São Paulo, Brazil
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20
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Abstract
Traditionally only a small proportion of the workforce was engaged in shift work. Changing economic pressures have resulted in increased engagement in shift work, with approximately 17 % of the workforce in Europe engaged in this work pattern. The present narrative review aimed to summarise the data on the effects of shift work on the diet, lifestyle and health of employees, while addressing the barriers to, and opportunities for, improving health among shift workers. Shift work can result in low-quality diet and irregular eating patterns. Adverse health behaviours are also reported; particularly increased smoking and poor sleep patterns. These altered lifestyle habits, in conjunction with disruption to circadian rhythms, can create an unfavourable metabolic phenotype which facilitates the development and progression of chronic disease. Although the data are inconclusive due to issues such as poor study design and inadequate control for confounding factors; shift workers appear to be at increased mental and physical health risk, particularly with regard to non-communicable diseases. Information is lacking on the obstacles to leading a healthier lifestyle while working shifts, and where opportunities lie for intervention and health promotion among this group. In order to provide an informed evidence base to assist shift workers in overcoming associated occupational hazards, this gap must be addressed. This review highlights the unique nutritional issues faced by shift workers, and the subsequent effect on health. In societies already burdened with increased incidence of non-communicable chronic diseases, there is a clear need for education and behaviour change interventions among this group.
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21
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Separate and Joint Associations of Shift Work and Sleep Quality with Lipids. Saf Health Work 2015; 7:111-9. [PMID: 27340597 PMCID: PMC4909845 DOI: 10.1016/j.shaw.2015.11.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 11/10/2015] [Accepted: 11/13/2015] [Indexed: 12/04/2022] Open
Abstract
Background Shift work and/or sleep quality may affect health. We investigated whether shift work and sleep quality, separately and jointly, were associated with abnormal levels of triglycerides, total cholesterol (TC), and low-and high-density lipoprotein cholesterol in 360 police officers (27.5% women). Methods Triglycerides, TC, and high-density lipoprotein were analyzed on the Abbott Architect; low-density lipoprotein was calculated. Shift work was assessed using City of Buffalo payroll work history records. Sleep quality (good, ≤ 5; intermediate, 6–8; poor, ≥ 9) was assessed using the Pittsburgh Sleep Quality Index questionnaire. A shift work + sleep quality variable was created: day plus good sleep; day plus poor sleep; afternoon/night plus good; and poor sleep quality. Mean values of lipid biomarkers were compared across categories of the exposures using analysis of variance/analysis of covariance. Results Shift work was not significantly associated with lipids. However, as sleep quality worsened, mean levels of triglycerides and TC gradually increased but only among female officers (age- and race-adjusted p = 0.013 and 0.030, respectively). Age significantly modified the association between sleep quality and TC. Among officers ≥ 40 years old, those reporting poor sleep quality had a significantly higher mean level of TC (202.9 ± 3.7 mg/dL) compared with those reporting good sleep quality (190.6 ± 4.0 mg/dL) (gender- and race-adjusted p = 0.010). Female officers who worked the day shift and also reported good sleep quality had the lowest mean level of TC compared with women in the other three categories (p = 0.014). Conclusion Sleep quality and its combined influence with shift work may play a role in the alteration of some lipid measures.
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22
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Abstract
Cardiovascular disease, diabetes and obesity are highly prevalent diseases associated with reduced quality of life and life expectancy. We discuss a novel risk factor for these cardiometabolic diseases: circadian disruption. Circadian disruption occurs when the internal circadian (∼24-hour) rhythms are not in synchrony with the environment or each other. This paper reviews (1) cardiometabolic health of shift work, which often leads to circadian disruption, (2) effects of experimentally disrupted circadian rhythms on cardiometabolic function, (3) observational studies of sleep timing and behavioral chronotype, and (4) potential mediators linking chronotype and shift work to circadian disruption and cardiometabolic health.
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Affiliation(s)
- Sirimon Reutrakul
- Division of Endocrinology and Metabolism, Faculty of Medicine Ramathibodi Hospital, Mahidol University, 270 Rama VI Road, Bangkok 10400, Thailand
| | - Kristen L Knutson
- Section of Pulmonary and Critical Care, Department of Medicine, University of Chicago, 5841 South Maryland Avenue, MC 6076, Chicago, IL 60637, USA.
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23
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Akbari H, Mirzaei R, Nasrabadi T, Gholami-Fesharaki M. Evaluation of the effect of shift work on serum cholesterol and triglyceride levels. IRANIAN RED CRESCENT MEDICAL JOURNAL 2015; 17:e18723. [PMID: 25763276 PMCID: PMC4341371 DOI: 10.5812/ircmj.18723] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 07/01/2014] [Accepted: 07/28/2014] [Indexed: 11/20/2022]
Abstract
Background: Working outside daylight hours (7 am to 7 pm) is called shift work. Shift work is a common practice in many industries and factories such as steel industries, petroleum industries, power plants, and in some services such as medicine and nursing and police forces, in which professionals provide services during day and night. Objectives: Considering the contradictory reports of different studies, we decided to evaluate the effect of shift work on cholesterol and triglyceride (TG) levels through a historical cohort on steel industry workers. Patients and Methods: This retrospective cohort study was performed on all the staff of Isfahan’s Mobarakeh Steel Company between years 2002 and 2011. There were 5773 participants in this study. Data were collected from the medical records of the staff using the census method. For analysis of data, generalized estimating equation (GEE) regression was used. Results: The results showed a significant difference in cholesterol levels between shift workers and day workers on the first observation (P < 0.001), yet no such difference was observed for TG (P = 0.853). Moreover, the results showed that the variables of age, work experience and BMI were not similar between shift workers and day workers. Therefore, to remove the effect of such variables, we used GEE regression. Despite the borderline difference of cholesterol between regular shift workers and day workers, this correlation was not statistically significant (P = 0.051). The results for TG also showed no correlation with shift work. Conclusions: According to the findings of this study, there is no relationship between shift work and changes in serum TG and cholesterol. The lack of relationship can be due to shift plans for shift workers, nutrition, or the “Healthy Heart project” at Isfahan Mobarakeh Steel Company.
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Affiliation(s)
- Hamed Akbari
- Health Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
- Department of HSE, Science and Research Branch, Islamic Azad University, Zahedan, IR Iran
| | - Ramazan Mirzaei
- Department of Occupational Health, Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, IR Iran
- Corresponding Author: Ramazan Mirzaei, Department of Occupational Health, Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, IR Iran. Tel: +98-9122887587, Fax: +98-2182482483, E-mail:
| | - Tahereh Nasrabadi
- Department of Nursing, Islamic Azad University, Zahedan Branch, Zahedan, IR Iran
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Ulhôa MA, Marqueze EC, Burgos LGA, Moreno CRC. Shift work and endocrine disorders. Int J Endocrinol 2015; 2015:826249. [PMID: 25892993 PMCID: PMC4393906 DOI: 10.1155/2015/826249] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 03/05/2015] [Accepted: 03/06/2015] [Indexed: 12/22/2022] Open
Abstract
The objective of this review was to investigate the impact of shift and night work on metabolic processes and the role of alterations in the sleep-wake cycle and feeding times and environmental changes in the occurrence of metabolic disorders. The literature review was performed by searching three electronic databases for relevant studies published in the last 10 years. The methodological quality of each study was assessed, and best-evidence synthesis was applied to draw conclusions. The literature has shown changes in concentrations of melatonin, cortisol, ghrelin, and leptin among shift workers. Melatonin has been implicated for its role in the synthesis and action of insulin. The action of this hormone also regulates the expression of transporter glucose type 4 or triggers phosphorylation of the insulin receptor. Therefore, a reduction in melatonin can be associated with an increase in insulin resistance and a propensity for the development of diabetes. Moreover, shift work can negatively affect sleep and contribute to sedentarism, unhealthy eating habits, and stress. Recent studies on metabolic processes have increasingly revealed their complexity. Physiological changes induced in workers who invert their activity-rest cycle to fulfill work hours include disruptions in metabolic processes.
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Affiliation(s)
- M. A. Ulhôa
- Department of Medicine, UNEC, Nossa Senhora das Graças, Unity II, 35300-345 Caratinga, MG, Brazil
- IMES, Rua João Patrício Araújo, No. 179 Veneza I, Ipatinga, MG, Brazil
- *M. A. Ulhôa:
| | - E. C. Marqueze
- Department of Epidemiology, Graduate Program of Public Health, Catholic University of Santos, Avenida Conselheiro Nébias 300, Vila Matias, 11015-002 Santos, SP, Brazil
| | - L. G. A. Burgos
- Department of Environmental Health, School of Public Health, University of São Paulo, Avenida Dr. Arnaldo 715, Cerqueira César, 01246-904 São Paulo, SP, Brazil
| | - C. R. C. Moreno
- Department of Environmental Health, School of Public Health, University of São Paulo, Avenida Dr. Arnaldo 715, Cerqueira César, 01246-904 São Paulo, SP, Brazil
- Stress Research Institute, Stockholm University, 106 91 Stockholm, Sweden
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Bernardes Souza B, Mussi Monteze N, Pereira de Oliveira FL, Magalhães de Oliveira J, Nascimento de Freitas S, Marques do Nascimento Neto R, Sales ML, Guerra Leal Souza G. Lifetime shift work exposure: association with anthropometry, body composition, blood pressure, glucose and heart rate variability. Occup Environ Med 2014; 72:208-15. [DOI: 10.1136/oemed-2014-102429] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Balieiro LCT, Rossato LT, Waterhouse J, Paim SL, Mota MC, Crispim CA. Nutritional status and eating habits of bus drivers during the day and night. Chronobiol Int 2014; 31:1123-9. [DOI: 10.3109/07420528.2014.957299] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Inoue M, Morita H, Inagaki J, Harada N. Influence of Differences in Their Jobs on Cardiovascular Risk Factors in Male Blue-collar Shift Workers in Their Fifties. INTERNATIONAL JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HEALTH 2013; 10:313-8. [PMID: 15473087 DOI: 10.1179/oeh.2004.10.3.313] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
This study examined relationships between different job types of shift work and hypertension, obesity, and dyslipidemia. Male blue-collar workers 50-59 years of age (n = 210) on the same three-shift schedule in a pulp and paper mill were divided into two groups; 118 in paper manufacturing (group 1) and 92 in the chemical products section (group 2). Only the frequency of hypertension differed significantly (p = 0.012) between the groups, 52.2% (n = 48) in group 2 vs 33.9% (n = 40) in group 1. The odds ratio for group 2 in relation to hypertension was 2.3 (95% CI 1.2-4.2). These results indicate a positive association between job type of shift work and hypertension and suggest that different job types of shift workers should not be combined when the effects of shift work on blood pressure are being examined.
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Affiliation(s)
- Masaiwa Inoue
- Department of Hygiene, Yamaguchi University School of Medicine, Ube-city, Yamaguchi, Japan.
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Evans JA, Davidson AJ. Health consequences of circadian disruption in humans and animal models. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2013; 119:283-323. [PMID: 23899601 DOI: 10.1016/b978-0-12-396971-2.00010-5] [Citation(s) in RCA: 190] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Daily rhythms in behavior and physiology are programmed by a hierarchical collection of biological clocks located throughout the brain and body, known as the circadian system. Mounting evidence indicates that disruption of circadian regulation is associated with a wide variety of adverse health consequences, including increased risk for premature death, cancer, metabolic syndrome, cardiovascular dysfunction, immune dysregulation, reproductive problems, mood disorders, and learning deficits. Here we review the evidence for the pervasive effects of circadian disruption in humans and animal models, drawing from both environmental and genetic studies, and identify questions for future research.
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Affiliation(s)
- Jennifer A Evans
- Department of Neurobiology, Morehouse School of Medicine, Atlanta, Georgia, USA
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Appéré V, Loddé B, Garlantezec R, Carpentier M, Delarue J, Pougnet R, Dewitte JD. Enquête sur les comportements alimentaires du personnel hospitalier de nuit du centre hospitalier universitaire de Brest. ARCH MAL PROF ENVIRO 2012. [DOI: 10.1016/j.admp.2012.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Smith MR, Eastman CI. Shift work: health, performance and safety problems, traditional countermeasures, and innovative management strategies to reduce circadian misalignment. Nat Sci Sleep 2012; 4:111-32. [PMID: 23620685 PMCID: PMC3630978 DOI: 10.2147/nss.s10372] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
There are three mechanisms that may contribute to the health, performance, and safety problems associated with night-shift work: (1) circadian misalignment between the internal circadian clock and activities such as work, sleep, and eating, (2) chronic, partial sleep deprivation, and (3) melatonin suppression by light at night. The typical countermeasures, such as caffeine, naps, and melatonin (for its sleep-promoting effect), along with education about sleep and circadian rhythms, are the components of most fatigue risk-management plans. We contend that these, while better than nothing, are not enough because they do not address the underlying cause of the problems, which is circadian misalignment. We explain how to reset (phase-shift) the circadian clock to partially align with the night-work, day-sleep schedule, and thus reduce circadian misalignment while preserving sleep and functioning on days off. This involves controlling light and dark using outdoor light exposure, sunglasses, sleep in the dark, and a little bright light during night work. We present a diagram of a sleep-and-light schedule to reduce circadian misalignment in permanent night work, or a rotation between evenings and nights, and give practical advice on how to implement this type of plan.
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Affiliation(s)
- Mark R Smith
- Biological Rhythms Research Laboratory, Rush University Medical Center, Chicago, IL, USA
| | - Charmane I Eastman
- Biological Rhythms Research Laboratory, Rush University Medical Center, Chicago, IL, USA
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Santana AA, Pimentel GD, Romualdo M, Oyama LM, Santos RVT, Pinho RA, de Souza CT, Rodrigues B, Caperuto EC, Lira FS. Sleep duration in elderly obese patients correlated negatively with intake fatty. Lipids Health Dis 2012; 11:99. [PMID: 22871062 PMCID: PMC3458937 DOI: 10.1186/1476-511x-11-99] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 07/24/2012] [Indexed: 02/05/2023] Open
Abstract
STUDY OBJECTIVES The purpose of the present study was to evaluate the relationship between sleep duration and dietary habits in elderly obese patients treated at an institute of cardiology. METHODS The fifty-eight volunteers were elderly patients with obesity (classified as obese according to BMI) of both genders, between 60 and 80 years of age. All participants were subjected to assessments of food intake, anthropometry, level of physical activity, and duration of sleep. RESULTS The men had significantly greater weight, height, and waist circumference than women. Sleep durations were correlated with dietary nutrient compositions only in men. We found a negative association between short sleep and protein intake (r = -0.43; p = 0.02), short sleep and monounsaturated fatty acids intake (r = -0.40; p = 0.03), and short sleep and cholesterol dietary intake (r = -0.50; p = 0.01). CONCLUSIONS We conclude that mainly in men, volunteers that had short sleep duration showed a preference for high energy-density as fatty food, at least in part, may explain the relationship between short sleep duration and the development of metabolic abnormalities.
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Affiliation(s)
- Aline Alves Santana
- Laboratório de Fisiologia e Bioquímica do Exercício, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
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Leonardi GC, Rapisarda V, Marconi A, Scalisi A, Catalano F, Proietti L, Travali S, Libra M, Fenga C. Correlation of the risk of breast cancer and disruption of the circadian rhythm (Review). Oncol Rep 2012; 28:418-28. [PMID: 22664950 DOI: 10.3892/or.2012.1839] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Accepted: 03/26/2012] [Indexed: 11/05/2022] Open
Abstract
Breast cancer is the worldwide leading cause of cancer incidence among women. Night shift work exposure has been recently considered one of the significant breast cancer risk factors in industrialized countries. The mechanisms by which this work exposure may be responsible for cancer development is still discussed. In the last 15 years, many authors have paid attention to the relationship between night shift work and breast cancer risk. In the current study, eight case-control studies and four prospective epidemiological studies describing such relationship are discussed. A positive correlation between night shift work and breast cancer risk was described in 8 out of 12 studies. However, different reasons suggest that some of these studies have an Achilles heel according to the International Agency of Cancer (IARC) indications. Both the circadian system alteration and the melatonin output reduction, related to the exposure to light-at-night during night shift work, remain the most valid hypotheses on the causal relation of shift work and breast cancer. Overall, the results of the present study suggest that there is an association between night shift work and breast cancer development in western countries. However, further studies are needed to confirm such association and to understand which biomolecular mechanisms may be involved in the pathogenesis of cancer diagnosed in patients with night shift work exposure.
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Affiliation(s)
- Giulia Costanza Leonardi
- Laboratory of Translational Oncology and Functional Genomics, Section of Pathology and Oncology, Department of Bio-medical Sciences, University of Catania, and Senology Unit, Cannizzaro Hospital, Catania, Italy
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The relationship between working schedule patterns and the markers of the metabolic syndrome: Comparison of shift workers with day workers. Int J Occup Med Environ Health 2012; 25:383-91. [DOI: 10.2478/s13382-012-0051-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2011] [Accepted: 05/25/2012] [Indexed: 11/20/2022] Open
Abstract
Abstract
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34
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Uetani M, Sakata K, Oishi M, Tanaka K, Nakada S, Nogawa K, Suwazono Y. The influence of being overweight on the relationship between shift work and increased total cholesterol level. Ann Epidemiol 2011; 21:327-35. [PMID: 21458725 DOI: 10.1016/j.annepidem.2011.01.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Revised: 12/01/2010] [Accepted: 01/07/2011] [Indexed: 11/29/2022]
Abstract
PURPOSE The aim of this study was to clarify the influence of shift work on serum total cholesterol (T-Cho) levels according to body mass index (BMI) at entry in Japanese male workers. METHODS A 14-year prospective cohort study was conducted in day workers (n = 4079) and alternating shift workers (n = 2807) who received annual health check-ups between 1991 and 2005 in a Japanese steel company. The association between job schedule and increases in T-Cho was investigated using multivariate pooled logistic regression analyses with age, BMI, lifestyle (smoking habit, drinking habit, habitual exercise), and the results of blood chemistries (creatinine, glycosylated hemoglobin A1c, aspartic aminotransferase, γ-glutamyl transpeptidase, uric acid) serving as covariates in those who were not overweight (BMI < 25 kg/m(2), n = 5082) and overweight (BMI ≥ 25 kg/m(2), n = 1804) at entry, respectively. The endpoints in the study were either a 20%, 25%, 30%, 35%, 40%, or 45% increase in T-Cho during the period of observation compared to T-Cho at entry. RESULTS In subjects who were not overweight at entry, alternating shift work was associated significantly with five serum T-Cho endpoints (≥20%: odds ratio [OR] = 1.15, 95% confidence interval [CI)] = 1.05, 1.26; ≥25%: OR = 1.17, 95% CI = 1.05, 1.31; ≥35%: OR = 1.24, 95% CI = 1.05, 1.46; ≥40%: OR = 1.30, 95% CI = 1.06, 1.61; ≥45%: OR = 1.31, 95% CI = 1.01, 1.71). However, alternating shift work was not associated with any of the six T-Cho endpoints in subjects who were overweight at entry. CONCLUSIONS In the present study, shift work was shown to be a potential risk factor for increased T-Cho in non-overweight Japanese male workers. However, we did not obtain a consistent association between shift work and an increase in T-Cho levels in overweight subjects. The results suggest that the effect of shift work on lipid regulation may be influenced by BMI.
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Affiliation(s)
- Mirei Uetani
- Department of Occupational and Environmental Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan
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KANTERMANN T, JUDA M, VETTER C, ROENNEBERG T. Shift-work research: Where do we stand, where should we go? Sleep Biol Rhythms 2010. [DOI: 10.1111/j.1479-8425.2010.00432.x] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Thomas C, Power C. Shift work and risk factors for cardiovascular disease: a study at age 45 years in the 1958 British birth cohort. Eur J Epidemiol 2010; 25:305-14. [PMID: 20237824 DOI: 10.1007/s10654-010-9438-4] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2009] [Accepted: 03/04/2010] [Indexed: 10/19/2022]
Abstract
This study examined associations between exposure to shift-work and risk factors for cardiovascular disease (CVD) and whether the associations are explained by socio-economic circumstances, occupational factors or health behaviours. Biological risk factors for CVD were measured in 7,839 participants of the 1958 British birth cohort at age 45 years who were in paid employment. Regular (>or=1/week) shift-workers included 46% working evenings (1800-2200), 28% weekends, 13% nights (2200-0400) and 14% early mornings (0400-0700). Adverse levels of several CVD risk factors were found in association with increasing participation in any shift-work. Men regularly working all four shift-work types had increased CVD risk factors of approximately 0.1-0.2 standard deviations (e.g. 0.8 kg/m(2) for body mass index; 1.2 cm for waist circumference) than those not regularly working shifts; for women, there was a positive linear trend for triglyceride levels, but a negative trend for diastolic blood pressure. Separate analyses of shift-work types showed associations primarily for night/morning working rather than evening/weekend working. Men had adverse levels of all CVD risk factors except blood pressure and total-cholesterol in association with night or early morning work and women had adverse triglyceride levels. Adjustment for socioeconomic, occupational factors and health behaviours explained most associations except for adiposity and C-reactive protein. Our results highlight night and early morning working associations with an adverse profile of CVD risk factors, which are partly explained by socioeconomic, other occupational factors and health behaviours.
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Affiliation(s)
- Claudia Thomas
- MRC Centre for Epidemiology of Child Health, UCL Institute of Child Health, London, UK.
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Thomas C, Power C. Do early life exposures explain associations in mid-adulthood between workplace factors and risk factors for cardiovascular disease? Int J Epidemiol 2010; 39:812-24. [PMID: 20081213 DOI: 10.1093/ije/dyp365] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Workplace factors (night work, long working hours, psychosocial work stress) have been reported to be associated with increased risk of cardiovascular disease (CVD). We investigated whether (i) workplace factors are associated with CVD risk factors independently of each other, (ii) workplace factors interact, thereby modifying associations and (iii) associations are explained by early life exposures. METHODS A total of 7916 employed participants in the 1958 British birth cohort underwent a clinical assessment at age 45 years. Regression analysis was used to examine associations between workplace factors and CVD risk factor levels with adjustment for early life exposures. RESULTS Night work was associated with adverse levels of most CVD risk factors. Working > or =48 h/week was positively associated with body mass index (BMI) and waist circumference (WC). Low job control was positively associated with glycosylated haemoglobin (HbA1c) and inflammatory factors, and inversely associated with high-density lipoprotein (HDL)-cholesterol. Low demands were positively associated with systolic blood pressure (SBP), triglycerides and inflammatory factors and inversely associated with HDL-cholesterol. Several associations were weakened when workplace factors were adjusted for each other. Night workers in low-demand jobs had higher BMI [0.78 kg/m(2); 95% confidence interval (CI) 0.35, 1.21], WC (1.49 cm; 0.45, 2.52) and SBP (1.38 mmHg; -0.04, 2.81). HDL was lower for low control plus night work (-0.04 mmol/l; -0.08, -0.01) or long hours (-0.12; -0.18, -0.69). Adjustment for early life exposures explained 30-50% of most associations, e.g. night work/low demands associations reduced by 50% for BMI and WC, and by 39% for SBP. CONCLUSIONS Associations between workplace factors and CVD risk factors in mid-adulthood arise in part from social and health disadvantage originating earlier in life.
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Affiliation(s)
- Claudia Thomas
- MRC Centre for Epidemiology of Child Health, UCL Institute of Child Health, London, UK.
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Bushnell PT, Colombi A, Caruso CC, Tak S. Work schedules and health behavior outcomes at a large manufacturer. INDUSTRIAL HEALTH 2010; 48:395-405. [PMID: 20720331 DOI: 10.2486/indhealth.mssw-03] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
There is evidence that work schedules may influence rates of unhealthy behaviors, suggesting that addressing work schedule challenges may improve health. Health Risk Assessment (HRA) survey responses were collected during 2000-2008 in a multinational chemical and coatings manufacturer. Responses of 26,442 were sufficiently complete for analysis. Rates of smoking, lack of exercise, moderate to high alcohol use, obesity (BMI > or = 30), and short sleep duration were compared by work schedule type (day, night, or rotating shift) and daily work hours (8, 10, or 12 h). Prevalence rate ratios (RRs) were calculated, adjusting for age group, sex, marital/living status, job tenure, and occupational group. The reference group was 8-h day shift employees. Overall prevalence rates were: sleep duration of 6 h or less per night 47%, smoking 17.3%, no exercise 22.0%, BMI > or = 30 28.3%, and moderate to heavy alcohol consumption 22.2%. Statistically significant RRs include the following: Short sleep duration: 10 h rotating shift (RR=1.6), 12 h day and 12 h rotating shifts (RR=1.3); Smoking: 12 h day and rotating shifts (RR=1.6), 10 and 12 h night and 8 h rotating shift (RR=1.4); No exercise: 8, 10, and 12 h rotating shifts (RR=1.2 to 1.3), 12 h day schedules (RR=1.3). Obesity (BMI > or = 30): 8 and 10 h night shifts (RR=1.3 and 1.4, respectively).
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Affiliation(s)
- P Timothy Bushnell
- Division of Surveillance, Hazard Evaluations, and Field Studies, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Cincinnati, Ohio 45226, USA.
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Puttonen S, Kivimäki M, Elovainio M, Pulkki-Råback L, Hintsanen M, Vahtera J, Telama R, Juonala M, Viikari JS, Raitakari OT, Keltikangas-Järvinen L. Shift work in young adults and carotid artery intima–media thickness: The Cardiovascular Risk in Young Finns study. Atherosclerosis 2009; 205:608-13. [DOI: 10.1016/j.atherosclerosis.2009.01.016] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2008] [Revised: 12/22/2008] [Accepted: 01/10/2009] [Indexed: 10/21/2022]
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Hansen AM, Larsen AD, Rugulies R, Garde AH, Knudsen LE. A Review of the Effect of the Psychosocial Working Environment on Physiological Changes in Blood and Urine. Basic Clin Pharmacol Toxicol 2009; 105:73-83. [PMID: 19563453 DOI: 10.1111/j.1742-7843.2009.00444.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ase M Hansen
- National Research Centre for the Working Environment (NRCWE), Copenhagen, Denmark.
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Al-Naimi S, Hampton SM, Richard P, Tzung C, Morgan LM. Postprandial Metabolic Profiles Following Meals and Snacks Eaten during Simulated Night and Day Shift Work. Chronobiol Int 2009; 21:937-47. [PMID: 15646240 DOI: 10.1081/cbi-200037171] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Shift workers are known to have an increased risk of developing cardiovascular disease (CVD) compared with day workers. An important factor contributing to this increased risk could be the increased incidence of postprandial metabolic risk factors for CVD among shift workers, as a consequence of the maladaptation of endogenous circadian rhythms to abrupt changes in shift times. We have previously shown that both simulated and real shift workers showed relatively impaired glucose and lipid tolerance if a single test meal was consumed between 00:00-02:00 h (night shift) compared with 12:00-14:00 h (day shift). The objective of the present study was to extend these observations to compare the cumulative metabolic effect of consecutive snacks/meals, as might normally be consumed throughout a period of night or day shift work. In a randomized crossover study, eight healthy nonobese men (20-33 yrs, BMI 20-25kg/m2) consumed a combination of two meals and a snack on two occasions following a standardized prestudy meal, simulating night and day shift working (total energy 2500 kcal: 40% fat, 50% carbohydrate, 10% protein). Meals were consumed at 01:00/ 13:00 h and 07:00/19:00h, and the snack at 04:00/16:00 h. Blood was taken after an overnight fast, and for 8 h following the first meal on each occasion, for the measurement of glucose, insulin, triacylglycerol (TAG), and nonesterified fatty acids (NEFA). RM-ANOVA (factors time and shift) showed a significant effect of shift for plasma TAG, with higher levels on simulated night compared to day shift (p < 0.05). There was a trend toward an effect of shift for plasma glucose, with higher plasma glucose at night (p = 0.08), and there was a time-shift interaction for plasma insulin levels (p < 0.01). NEFA levels were unaffected by shift. Inspection of the area under the plasma response curve (AUC) following each meal and snack revealed that the differences in lipid tolerance occurred throughout the study, with greatest differences occurring following the mid-shift snack. In contrast, glucose tolerance was relatively impaired following the first night-time meal, with no differences observed following the second meal. Plasma insulin levels were significantly lower following the first meal (p < 0.05), but significantly higher following the second meal (p < 0.01) on the simulated night shift. These findings confirm our previous observations of raised postprandial TAG and glucose at night, and show that sequential meal ingestion has a more pronounced effect on subsequent lipid than carbohydrate tolerance.
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Affiliation(s)
- S Al-Naimi
- School of Biomedical and Molecular Sciences, University of Surrey, Guildford, Surrey, UK
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Biggi N, Consonni D, Galluzzo V, Sogliani M, Costa G. Metabolic Syndrome in Permanent Night Workers. Chronobiol Int 2009; 25:443-54. [DOI: 10.1080/07420520802114193] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Suwazono Y, Dochi M, Sakata K, Okubo Y, Oishi M, Tanaka K, Kobayashi E, Kido T, Nogawa K. A longitudinal study on the effect of shift work on weight gain in male Japanese workers. Obesity (Silver Spring) 2008; 16:1887-93. [PMID: 18535539 DOI: 10.1038/oby.2008.298] [Citation(s) in RCA: 153] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
OBJECTIVE This study compared the effect of alternating shift work and day work on weight gain in Japanese male workers. METHODS AND PROCEDURES A longitudinal cohort study was conducted in day workers (n = 4,328) and alternating shift workers (n = 2,926) of a steel company who received annual health checkups over a 14-year period between 1991 and 2005. The association between the type of job schedule and weight gain was investigated using multivariate pooled logistic regression analyses. The endpoints in the study were either a 5, 7.5, or 10% increase in BMI during the period of observation, compared to the BMI at entry. RESULTS The type of job schedule was significantly associated with all three BMI endpoints (5% increase in BMI; odds ratio (OR) for comparison between alternating shift workers and regular day workers, 1.14; 95% confidence interval (CI), 1.06-1.23): (7.5% increase in BMI; OR, 1.13; 95%CI, 1.03-1.24: 10% increase in BMI; OR, 1.13; 95%CI, 1.00-1.28). BMI at study entry was also positively associated with the 5, 7.5, and 10% increases in BMI during the study. On the other hand, age and drinking habits were negatively associated with 5, 7.5, and 10% increases in BMI. DISCUSSION Our study revealed that alternating shift work was an independent risk factor for weight gain in male Japanese workers. Efficient health screening and regular checkups, combined with support to control unhealthy lifestyle factors, would be of considerable benefit for maintaining the health of Japanese shift workers.
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Affiliation(s)
- Yasushi Suwazono
- Department of Occupational and Environmental Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan.
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Abstract
Shift work is now common in society and is not restricted to heavy industry or emergency services, but is increasingly found amongst 'white collar' occupations and the growing number of service industries. Participation in shift work is associated with increased body mass index, prevalence of obesity and other health problems. We review the behavioural and biological disturbances that occur during shift work and discuss their impact on leisure-time physical activity and energy balance. Shift work generally decreases opportunities for physical activity and participation in sports. For those shift workers who are able to exercise, subjective and biological responses can be altered if the exercise is taken at unusual times of day and/or if the shift worker is sleep deprived. These altered responses may in turn impact on the longer-term adherence to an exercise programme. The favourable effects of exercise on body mass control and sleep quality in shift workers have not been confirmed. Similarly, recent reports of relationships between sleep duration and obesity have not been examined in a shift work context. There is no evidence that exercise can mediate certain circadian rhythm characteristics (e.g. amplitude or timing) for improved tolerance to shift work. Total energy intake and meal composition do not seem to be affected by participation in shift work. Meal frequency is generally reduced but snacking is increased on the night shift. Unavailability of preferred foods in the workplace, a lack of time, and a reduced desire to eat at night explain these findings. 'Normal' eating habits with the family are also disrupted. The metabolic responses to food are also altered by shift work-mediated disruptions to sleep and circadian rhythms. Whether any interactions on human metabolism exist between timing or content of food intake and physical activity during shift work is not known at present. There are very few randomized controlled studies on the efficacy of physical activity or dietary interventions during shift work. Some favourable effects of such interventions on fatigue levels at work have been reported, but biological and behavioural outcomes relevant to long-term health and energy balance have not been studied adequately. In addition, recruitment and retention of research participants for randomized controlled trials of physical activity or dietary interventions have been very difficult. We present a model of the various behavioural and biological factors relevant to exercise and energy balance during shift work as a framework for future research.
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Affiliation(s)
- Greg Atkinson
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK.
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Abstract
The present review investigates the role of sleep and its alteration in triggering metabolic disorders. The reduction of the amount of time sleeping has become an endemic condition in modern society and the current literature has found important associations between sleep loss and alterations in nutritional and metabolic aspects. Studies suggest that individuals who sleep less have a higher probability of becoming obese. It can be related to the increase of ghrelin and decrease of leptin levels, generating an increase of appetite and hunger. Sleep loss has been closely associated with problems in glucose metabolism and a higher risk for the development of insulin resistance and diabetes, and this disturbance may reflect decreased efficacy of the negative-feedback regulation of the hypothalamic–pituitary–adrenal axis. The period of sleep is also associated with an increase of blood lipid concentrations, which can be intensified under conditions of reduced sleep time, leading to disorders in fat metabolism. Based on a review of the literature, we conclude that sleep loss represents an important risk factor for weight gain, insulin resistance, type 2 diabetes and dyslipidaemia. Therefore, an adequate sleep pattern is fundamental for the nutritional balance of the body and should be encouraged by professionals in the area.
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Haus E, Smolensky M. Biological clocks and shift work: circadian dysregulation and potential long-term effects. Cancer Causes Control 2006; 17:489-500. [PMID: 16596302 DOI: 10.1007/s10552-005-9015-4] [Citation(s) in RCA: 224] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Long-term epidemiologic studies on large numbers of night and rotating shift workers have suggested an increase in the incidence of breast and colon cancer in these populations. These studies suffer from poor definition and quantification of the work schedules of the exposed subjects. Against this background, the pathophysiology of phase shift and phase adaptation is reviewed. A phase shift as experienced in night and rotating shift work involves desynchronization at the molecular level in the circadian oscillators in the central nervous tissue and in most peripheral tissues of the body. There is a change in the coordination between oscillators with transient loss of control by the master-oscillator (the Suprachiasmatic Nucleus, SCN) in the hypothalamus. The implications of the pathophysiology of phase shift are discussed for long-term health effects and for the design of ergonomic work schedules minimizing the adverse health effects upon the worker.
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Affiliation(s)
- Erhard Haus
- Department of Laboratory Medicine & Pathology, University of Minnesota, Health Partners Medical Group, Regions Hospital, St. Paul, Minnesota 55101, USA.
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Boivin DB, James FO. Light treatment and circadian adaptation to shift work. INDUSTRIAL HEALTH 2005; 43:34-48. [PMID: 15732302 DOI: 10.2486/indhealth.43.34] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Work at unconventional hours can have both long and short term consequences. Shift workers are often required to perform their duties at times that are not favoured by the body's endogenous clock, or circadian pacemaker. A typical night shift worker, for example, may report reductions in alertness and performance during shifts, or significant difficulty attaining sleep of recuperative value in the day, all the while being more likely to develop health complications. The study of circadian physiology has significantly contributed to our current ability to aid the shift worker deal with atypical schedules. We discuss the usefulness of light treatment as a countermeasure for maladaptation to atypical work schedules.
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Affiliation(s)
- Diane B Boivin
- Center for Study and Treatment of Circadian Rhythms, Douglas Hospital Research Center, affiliated to the Department of Psychiatry, McGill University, 6875 LaSalle Boulevard, room F-1127, Montreal, Quebec, H4H 1R3, Canada
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Di Lorenzo L, De Pergola G, Zocchetti C, L'Abbate N, Basso A, Pannacciulli N, Cignarelli M, Giorgino R, Soleo L. Effect of shift work on body mass index: results of a study performed in 319 glucose-tolerant men working in a Southern Italian industry. Int J Obes (Lond) 2003; 27:1353-8. [PMID: 14574346 DOI: 10.1038/sj.ijo.0802419] [Citation(s) in RCA: 203] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To examine the influence of shift work on metabolic and cardiovascular risk factors in subjects working in an industry sited in Apulia, Southern Italy. DESIGN Cross-sectional study of metabolic effects of shift work in glucose tolerant workers in a chemical industry in southern Italy. SUBJECTS The subjects included 319 glucose tolerant male individuals, aged 35-60 y. MEASUREMENTS Anthropometric parameters (body mass index (BMI) and waist-to-hip ratio (WHR)), fasting concentrations of glucose, insulin, and lipids (total cholesterol, HDL-cholesterol, triglycerides), the sum of glucose levels during 75 g-oral glucose tolerance test (Sigma-OGTT), and systolic and diastolic blood pressure (SBP and DBP, respectively). RESULTS The prevalence of obesity was higher among shift workers compared to day workers, whereas body fat distribution was not different between the two groups. Shift workers had higher BMI than day workers, and shift working was associated with BMI, independently of age and work duration. Shift workers had significantly higher SBP levels, which were independently influenced by BMI, but not by shift work, thus suggesting that the difference in SBP may well be mediated by the increased body fatness. CONCLUSION In workers of an industry sited in Southern Italy, shift work may be directly responsible for increased body fatness and is indirectly associated with higher blood pressure levels and some features of metabolic syndrome.
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Affiliation(s)
- L Di Lorenzo
- Occupational Health, Department of Internal Medicine and Public Health, University of Bari, Bari, Italy
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Holmbäck U, Lowden A, Akerfeldt T, Lennernäs M, Hambraeus L, Forslund J, Akerstedt T, Stridsberg M, Forslund A. The human body may buffer small differences in meal size and timing during a 24-h wake period provided energy balance is maintained. J Nutr 2003; 133:2748-55. [PMID: 12949360 DOI: 10.1093/jn/133.9.2748] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Because approximately 20% of the work force in the industrialized world have irregular working hours, it is pertinent to study the consequences of eating at irregular, especially nighttime hours. We studied the postprandial responses during nocturnal fasting vs. eating throughout a 24-h wake period. Seven healthy males were studied twice in a crossover design. After a 6-d diet adjustment period [high fat diet, 45 energy percent (en%) fat, 40 en% carbohydrates)] with sleep from 2300 to 0700 h, the men were kept awake for 24 h at the metabolic ward and given either 6 isoenergetic meals, i.e., every 4 h (N-eat) or 4 isoenergetic meals from 0800 to 2000 h followed by a nocturnal fast (N-fast), with the same 24-h energy intake. Energy expenditure, substrate utilization, activity, heat release, body temperature and blood variables were measured over 24 h. Energy expenditure and blood glucose, triacylglycerol, insulin and glucagon concentrations were lower and nonesterified fatty acids concentrations were higher during the nocturnal fast than during nocturnal eating (P < 0.05); however, no 24-h differences between the protocols were apparent. Nocturnal fasting slightly altered the secretory patterns of the thyroid hormones and cortisol (P < 0.05). We found no clear indication that it would be more favorable to ingest few larger daytime meals than smaller meals throughout the 24-h period. The body seems to be able to buffer small differences in meal size and timing provided energy balance is maintained.
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Affiliation(s)
- Ulf Holmbäck
- Department of Medical Sciences, Nutrition, Uppsala University Hospital, SE-751 85 Uppsala, Sweden.
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