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Crowthers R, Thi Mong Nguyen T, Martinez D. Circadian disruptions and their role in the development of hypertension. Front Neurosci 2024; 18:1433512. [PMID: 39170672 PMCID: PMC11335678 DOI: 10.3389/fnins.2024.1433512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2024] [Accepted: 07/22/2024] [Indexed: 08/23/2024] Open
Abstract
Circadian fluctuations in physiological setpoints are determined by the suprachiasmatic nucleus (SCN) which exerts control over many target structures within and beyond the hypothalamus via projections. The SCN, or central pacemaker, orchestrates synchrony between the external environment and the internal circadian mechanism. The resulting cycles in hormone levels and autonomic nervous system (ANS) activity provide precise messages to specific organs, adjusting, for example, their sensitivity to approaching hormones or metabolites. The SCN responds to both photic (light) and non-photic input. Circadian patterns are found in both heart rate and blood pressure, which are linked to daily variations in activity and autonomic nervous system activity. Variations in blood pressure are of great interest as several cardiovascular diseases such as stroke, arrhythmias, and hypertension are linked to circadian rhythm dysregulation. The disruption of normal day-night cycles, such as in shift work, social jetlag, or eating outside of normal hours leads to desynchronization of the central and peripheral clocks. This desynchronization leads to disorganization of the cellular processes that are normally driven by the interactions of the SCN and photic input. Here, we review autonomic system function and dysfunction due to regulation and interaction between different cardiorespiratory brain centers and the SCN, as well as social, lifestyle, and external factors that may impact the circadian control of blood pressure.
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2
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Luz CSDS, Fonseca AETPD, Santos JS, Araujo JF, Duarte LL, Moreno CRDC. Association of Meal Timing with Sleep Quality and Anxiety According to Chronotype: A Study of University Students. Clocks Sleep 2024; 6:156-169. [PMID: 38534799 DOI: 10.3390/clockssleep6010011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 03/03/2024] [Accepted: 03/08/2024] [Indexed: 03/28/2024] Open
Abstract
There are several determinants of mental health symptoms, ranging from individual characteristics to social factors. Consistent with patterns in the general population, students with evening characteristics tend to exhibit more anxiety symptoms and poorer sleep quality compared to morning students. Meal timing also appears to affect sleep and may be associated with mental health symptoms. In this context, the aim of the present study was to investigate the association of the timing of the main and last meals of the day with sleep quality and anxiety levels, according to the chronotype of university students. This study was conducted in colleges in São Paulo, Brazil, and involved application of a questionnaire to 162 university students. The questionnaire collected sociodemographic information meal and study times, and included scales assessing eveningness and morningness, sleep quality, and anxiety. Students demonstrating a phase delay in both chronotype and dinner timing exhibited higher levels of anxiety compared to morning-type students. Although no associations were observed between meal timing and sleep quality, sleeping later was associated with poorer sleep quality. The study suggests that evening students and those who eat late at night are more prone to presenting mental health symptoms. More studies are needed to further investigate this association.
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Affiliation(s)
- Cristina Souza da Silva Luz
- Department of Health, Life Cycles, and Society, School of Public Health, University of São Paulo, São Paulo 01246-904, Brazil
| | | | - Jefferson Souza Santos
- Department of Health, Life Cycles, and Society, School of Public Health, University of São Paulo, São Paulo 01246-904, Brazil
- Department of Theory and Foundations of Education, Education Sector, Federal University of Paraná, Curitiba 80230-130, Brazil
| | - John Fontenele Araujo
- Department of Physiology and Behavior, Federal University of Rio Grande do Norte, Natal 59078-900, Brazil
| | - Leandro Lourenção Duarte
- Department for Health Sciences, Federal University of Recôncavo da Bahia, Cruz das Almas 44380-000, Brazil
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Saggi MK, Phillips CL, Comas M, Hoyos CM, Marshall NS, Shiao JSC, Guo YL, Lin TT, Cayanan EA, Gordon CJ. Does daily energy and macronutrient intake differ between work and non-workdays in shift workers? A mixed methods study. Chronobiol Int 2023; 40:1039-1048. [PMID: 37599382 DOI: 10.1080/07420528.2023.2246559] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 06/26/2023] [Accepted: 08/04/2023] [Indexed: 08/22/2023]
Abstract
Shift workers are at increased risk of obesity and metabolic diseases, but their eating patterns on work and non-workdays are understudied. We aimed to examine whether energy intake and macronutrient intake of day and night shift nurses were different during work and non-workdays. We used a mixed-methods approach to study food intake of shift working nurses from two hospitals during day and night shifts. Participants completed baseline questionnaires about eating behaviour, sleep, chronotype, mood and shift work disorder. Participants then completed a 4-d food diary which included a non-workday prior to the first shift, the first and last shift (either day or night) and the following non-workday. After completion of the food diaries, we used semi-structured interviews to explore the qualitative aspects of eating behaviours. Seventy-nine shift-working nurses participated in the study. Daily energy intake was not significantly different on work and non-workdays in day or night shift workers (p > 0.05). Whilst macronutrient consumption was also not different between day and night shift workers (p > 0.05), sugar intake was higher in day compared to night shift workers (p = 0.02) on the non-workday prior to the first workday. In qualitative interviews, participants reported their eating to be different on day and night shifts as well as work and non-workdays. Eating behaviour in day and night shift workers was highly influenced by food availability, convenience, peers, and family members. Nurses qualitatively report that night and day shifts result in them eating differently despite no statistically discernible difference in energy intake.
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Affiliation(s)
- Manjeet Kaur Saggi
- Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
- CIRUS Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, Sydney, Australia
| | - Craig L Phillips
- CIRUS Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, Sydney, Australia
- Faculty of Medicine, Health and Human Sciences, Macquarie University, Sydney, Australia
| | - Maria Comas
- CIRUS Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, Sydney, Australia
| | - Camilla M Hoyos
- CIRUS Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, Sydney, Australia
- School of Psychology, Faculty of Science, The University of Sydney, Sydney, Australia
| | - Nathaniel S Marshall
- CIRUS Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, Sydney, Australia
- Faculty of Medicine, Health and Human Sciences, Macquarie University, Sydney, Australia
| | - Judith Shu-Chu Shiao
- School of Nursing, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yue Leon Guo
- Environmental and Occupational Medicine, National Taiwan University, Taipei, Taiwan
| | - Ting-Ti Lin
- School of Nursing, National Défense Medical Centre, Taipei, Taiwan
| | - Elizabeth A Cayanan
- Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
- CIRUS Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, Sydney, Australia
| | - Christopher J Gordon
- Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
- CIRUS Centre for Sleep and Chronobiology, Woolcock Institute of Medical Research, Sydney, Australia
- Faculty of Medicine, Health and Human Sciences, Macquarie University, Sydney, Australia
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4
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Marot LP, Lopes TDVC, Balieiro LCT, Crispim CA, Moreno CRC. Impact of Nighttime Food Consumption and Feasibility of Fasting during Night Work: A Narrative Review. Nutrients 2023; 15:nu15112570. [PMID: 37299533 DOI: 10.3390/nu15112570] [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: 05/10/2023] [Revised: 05/23/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023] Open
Abstract
Shift work has been associated with an increased risk of developing chronic non-communicable diseases, such as obesity. The reduction in overnight fasting and its physiological consequences seem to affect the metabolic health of shift workers, but little has been discussed regarding the feasibility and implications of maintaining a night-long fast during work. This narrative review aims to discuss the impact of eating behavior on the reduction of overnight fasting in shift workers, as well as possible nutritional strategies involving fasting that have been tested for shift workers, to contribute to the establishment of nutritional guidelines for them. We used various databases and search engines to retrieve relevant articles, reviews, and investigations. Despite the potential benefits of overnight fasting for other groups, few studies have investigated this approach in the context of shift work. Generally, it seems to be a feasible and metabolically beneficial strategy for shift workers. However, it is essential to investigate the potential risks and benefits of reducing the fasting time for shift workers, considering social, hedonic, and stress-related factors. Furthermore, randomized clinical trials are necessary to establish safe and feasible strategies for shift workers to practice different fasting windows.
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Affiliation(s)
- Luisa Pereira Marot
- Chrononutrition Research Group, Faculty of Medicine, Federal University of Uberlândia, Uberlândia 38405-320, Brazil
| | - Tássia do Vale Cardoso Lopes
- Chrononutrition Research Group, Faculty of Medicine, Federal University of Uberlândia, Uberlândia 38405-320, Brazil
| | | | - Cibele Aparecida Crispim
- Chrononutrition Research Group, Faculty of Medicine, Federal University of Uberlândia, Uberlândia 38405-320, Brazil
| | - Cláudia Roberta Castro Moreno
- Department of Health, Life Cycles and Society, School of Public Health, University of São Paulo, Sao Paulo 01246-904, Brazil
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Teixeira BS, Silva CM, Silva ATF, Santos LLD, de Paiva Maia YC, Pedrazzoli M, Wright KP, Crispim CA. Influence of fasting during the night shift on next day eating behavior, hunger, and glucose and insulin levels: a randomized, three-condition, crossover trial. Eur J Nutr 2023; 62:1281-1293. [PMID: 36526739 DOI: 10.1007/s00394-022-03069-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 12/01/2022] [Indexed: 12/23/2022]
Abstract
AIMS To investigate the influence of fasting during the night shift on eating behavior, hunger, glucose and insulin levels the following day. METHODS Study with 10 male police officers who have been working at night. Participants were tested under three different conditions separated by at least 6 days of washout in a randomized, crossover design: "Night Shift Fasting" (NSF)-two nights of fasting during the night shift; "Night Shift Eating" (NSE)-two nights with the consumption of a standardized meal during the night shift (678 ± 42 kcal consumed at ~ 0200 h); and "Nighttime Sleep" (NS)-two nights of sleep. The morning after, blood glucose and insulin and hunger ratings were assessed, and food intake was assessed with an ad libitum test meal. Food intake was also assessed throughout the remainder of the day using a food record. Generalized Estimating Equations were used to analyze the effect of experimental condition. RESULTS Food intake during the test meal, especially of proteins and fats, was higher after fasting during the night shift compared to the other conditions (p < 0.05), whereas desire to eat scores were lower after the NSF compared to NSE condition (p = 0.043). Hunger levels were lower after the NSF compared to the NS condition (p = 0.012). Insulin and HOMA-IR were also lower in the morning after NSF (p < 0.001). CONCLUSION Fasting during the night shift leads to not only a higher intake of energy and macronutrients both in the early morning after work and throughout the next day, but also lower insulin levels and HOMA-IR in the morning. REGISTRATION NUMBER OF CLINICAL TRIAL NCT03800732. Initial release: 01/09/2019. Last release: 02/23/2022.
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Affiliation(s)
- Bruno Simão Teixeira
- Chrononutrition Research Group, School of Medicine, Faculty of Medicine, Federal University of Uberlândia, Av. Para, 1720, Bloco 2U, Sala 20. Campus Umuarama, Uberlândia, Minas Gerais, 38405-320, Brazil
| | - Catarina Mendes Silva
- Chrononutrition Research Group, School of Medicine, Faculty of Medicine, Federal University of Uberlândia, Av. Para, 1720, Bloco 2U, Sala 20. Campus Umuarama, Uberlândia, Minas Gerais, 38405-320, Brazil
| | - Alinne Tatiane Faria Silva
- Molecular Biology and Nutrition Research Group, School of Medicine, Federal University of Uberlândia, Uberlândia, Minas Gerais, 38405-320, Brazil
| | - Letícia Lopes Dantas Santos
- Molecular Biology and Nutrition Research Group, School of Medicine, Federal University of Uberlândia, Uberlândia, Minas Gerais, 38405-320, Brazil
| | - Yara Cristina de Paiva Maia
- Molecular Biology and Nutrition Research Group, School of Medicine, Federal University of Uberlândia, Uberlândia, Minas Gerais, 38405-320, Brazil
| | - Mario Pedrazzoli
- School of Arts, Sciences and Humanities of University of São Paulo, São Paulo, Brazil
| | - Kenneth P Wright
- Sleep and Chronobiology Laboratory, Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, 80309-0354, USA
| | - Cibele Aparecida Crispim
- Chrononutrition Research Group, School of Medicine, Faculty of Medicine, Federal University of Uberlândia, Av. Para, 1720, Bloco 2U, Sala 20. Campus Umuarama, Uberlândia, Minas Gerais, 38405-320, Brazil.
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Marqueze EC, de Sá e Benevides EA, Russo AC, Fürst MSG, Roscani RC, Guimarães PCV, Salim CA. Organizational Risk Factors for Aircrew Health: A Systematic Review of Observational Studies. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:3401. [PMID: 36834104 PMCID: PMC9960399 DOI: 10.3390/ijerph20043401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 01/12/2023] [Accepted: 02/08/2023] [Indexed: 06/18/2023]
Abstract
Addressing the field of health and safety at work, the primary objective of the present systematic review was to analyze the organizational risk factors for aircrew health according to professional category (flight attendants and pilots/co-pilots) and their consequences. The secondary objective was to identify the countries in which studies were carried out, focusing on the quality of content of the publications. The Medline/Pubmed, Cochrane, Web of Science, and Scopus databases were searched for eligible studies according to PRISMA statements. The risk of bias and the methodological quality of the studies were assessed using the Newcastle-Ottawa scale and Loney tools. Of the 3230 abstracts of articles screened, 36 studies met the inclusion criteria. Most of the research conducted on risk factors for the work organization of aircrew was carried out in the United States and the European Union and had moderate or low-quality methodology and evidence. However, the findings are homogeneous and allow the most prevalent organizational risk factors for the health of aircrew to be determined, namely, high work demand, long hours, and night work. Consequently, the most pervasive health problems were sleep disturbances, mental health disorders, musculoskeletal disorders, and fatigue. Thus, the regulation of the aircrew profession must prioritize measures that minimize these risk factors to promote better health and sleep for these professionals and, consequently, to provide excellent safety for workers and passengers.
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Affiliation(s)
- Elaine Cristina Marqueze
- Fundação Jorge Duprat Figueiredo de Segurança e Medicina do Trabalho—Fundacentro, São Paulo 30180-100, Brazil
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7
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Rusu A, Ciobanu DM, Inceu G, Craciun AE, Fodor A, Roman G, Bala CG. Variability in Sleep Timing and Dietary Intake: A Scoping Review of the Literature. Nutrients 2022; 14:nu14245248. [PMID: 36558406 PMCID: PMC9782032 DOI: 10.3390/nu14245248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/06/2022] [Accepted: 12/07/2022] [Indexed: 12/13/2022] Open
Abstract
The objective of this scoping review was to summarize previous studies which examined the effect of day-to-day variability in sleep timing and social jetlag (SJL) on dietary intake. A systematic literature search was conducted in PubMed, Embase, and Clarivate Analytics Web of Science and we identified 22 records. No difference in caloric and macronutrient intake between SJL groups was observed in studies that enrolled healthy young adults. However, studies that enrolled participants with obesity and obesity-related chronic conditions reported a higher caloric intake and a higher intake of carbohydrates, total fat, saturated fats, and cholesterol in participants with SJL than in those without. Most studies reported a lower quality of diet, a delayed mealtime, and eating jetlag in participants with SJL vs. those without SJL. No correlation of day-to-day variability in sleep timing with average caloric intake was observed, but bed-time variability was negatively associated with diet quality. Methodological issues have been identified in sources assessed including study design, power calculation, population enrolled, and tools/metrics used for sleep timing variability assessment. Future well powered longitudinal studies, with clear protocols, standardized metrics, including all age groups from general population are needed to clarify the dietary intake consequences of variability in sleep timing.
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Affiliation(s)
- Adriana Rusu
- Department of Diabetes and Nutrition Diseases, Iuliu Hatieganu University of Medicine and Pharmacy, 400006 Cluj-Napoca, Romania
- Diabetes Center, Emergency Clinical County Hospital Cluj, 400006 Cluj-Napoca, Romania
| | - Dana Mihaela Ciobanu
- Department of Diabetes and Nutrition Diseases, Iuliu Hatieganu University of Medicine and Pharmacy, 400006 Cluj-Napoca, Romania
- Diabetes Center, Emergency Clinical County Hospital Cluj, 400006 Cluj-Napoca, Romania
- Correspondence:
| | - Georgeta Inceu
- Department of Diabetes and Nutrition Diseases, Iuliu Hatieganu University of Medicine and Pharmacy, 400006 Cluj-Napoca, Romania
- Diabetes Center, Emergency Clinical County Hospital Cluj, 400006 Cluj-Napoca, Romania
| | - Anca-Elena Craciun
- Department of Diabetes and Nutrition Diseases, Iuliu Hatieganu University of Medicine and Pharmacy, 400006 Cluj-Napoca, Romania
- Diabetes Center, Emergency Clinical County Hospital Cluj, 400006 Cluj-Napoca, Romania
| | - Adriana Fodor
- Department of Diabetes and Nutrition Diseases, Iuliu Hatieganu University of Medicine and Pharmacy, 400006 Cluj-Napoca, Romania
- Diabetes Center, Emergency Clinical County Hospital Cluj, 400006 Cluj-Napoca, Romania
| | - Gabriela Roman
- Department of Diabetes and Nutrition Diseases, Iuliu Hatieganu University of Medicine and Pharmacy, 400006 Cluj-Napoca, Romania
- Diabetes Center, Emergency Clinical County Hospital Cluj, 400006 Cluj-Napoca, Romania
| | - Cornelia Gabriela Bala
- Department of Diabetes and Nutrition Diseases, Iuliu Hatieganu University of Medicine and Pharmacy, 400006 Cluj-Napoca, Romania
- Diabetes Center, Emergency Clinical County Hospital Cluj, 400006 Cluj-Napoca, Romania
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8
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Hwang SK, Lee YJ, Cho ME, Kim BK, Yoon YI. Factors Associated with Gastrointestinal Symptoms among Rotating Shift Nurses in South Korea: A Cross-Sectional Study. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:9795. [PMID: 36011441 PMCID: PMC9408213 DOI: 10.3390/ijerph19169795] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 08/08/2022] [Indexed: 06/15/2023]
Abstract
Rotating shift work places a serious burden on nurses' physical and psychological health. Gastrointestinal (GI) symptoms are a common complaint among shift workers. This study assessed GI symptoms and identified the associations between dietary habits, psychological status, and sleep quality among rotating shift nurses. Data from 125 female nurses in rotating shifts who worked at two tertiary hospitals in South Korea were collected using a questionnaire that included the Gastrointestinal Symptoms Questionnaire; the Dietary Habit Questionnaire; the Depression, Anxiety, Stress Scale (DASS)-21; and the Pittsburgh Sleep Quality Index (PSQI). All participants experienced various GI symptoms, and 47% of them complained of at least one severe GI symptom. There were significant differences in GI symptom scores according to the status of depression, anxiety, stress, and sleep quality. In multiple linear regression analysis, the factors associated with an increase in the occurrence and severity of GI symptoms were poor sleep quality and morbid anxiety and stress. The model explained power at 43.2%. As most nurses in rotating shifts experience GI symptoms, they should receive counseling and training programs at work to alleviate psychological symptoms, improve sleep quality, and pay more attention to their health status as well as GI symptom management.
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Affiliation(s)
- Sun-Kyung Hwang
- College of Nursing, Pusan National University, Yangsan 50612, Korea
- Research Institute of Nursing Science, Pusan National University, Yangsan 50612, Korea
| | - Yun-Ji Lee
- College of Nursing, Pusan National University, Yangsan 50612, Korea
| | - Min-Eun Cho
- Department of Nursing, Graduate School, Pusan National University, Yangsan 50612, Korea
| | - Bo-Kyoung Kim
- Department of Nursing, Graduate School, Pusan National University, Yangsan 50612, Korea
| | - Yea-In Yoon
- Department of Nursing, Pusan National University Yangsan Hospital, Yangsan 50612, Korea
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9
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Storz MA, Lombardo M, Rizzo G, Müller A, Lederer AK. Bowel Health in U.S. Shift Workers: Insights from a Cross-Sectional Study (NHANES). INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19063334. [PMID: 35329018 PMCID: PMC8954046 DOI: 10.3390/ijerph19063334] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/07/2022] [Accepted: 03/09/2022] [Indexed: 11/24/2022]
Abstract
Working outside of regular daytime hours is increasingly common in current societies and poses a substantial challenge to an individual’s biological rhythm. Disruptions of the gastrointestinal tract’s circadian rhythm and poor dietary choices subsequent to shiftwork may predispose the shift workforce to an increased risk of gastrointestinal disorders, including constipation, peptic ulcer disease, and erosive gastritis. We investigated bowel health in a US population of shift workers, using data from the National Health and Nutrition Examination Survey, and compared bowel movement (BM) frequency and defecation patterns between 2007 day workers and 458 shift workers (representing 55,305,037 US workers). Using bivariate and multivariate logistic regression techniques, our results suggested no association between shiftwork status and BM frequency, bowel leakage of gas, and stool consistency. Constipation prevalence was high but comparable in both groups (6.90% vs. 7.09%). The low fiber intake observed in both groups (15.07 vs. 16.75 g/day) could play a potential role here. The two groups did not differ with regard to other nutrients that may influence BM frequency and stool consistency (e.g., carbohydrate or caffeine intake). Additional studies including food group analyses and fecal biomarkers are warranted for a better understanding of GI health in shift workers.
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Affiliation(s)
- Maximilian Andreas Storz
- Center for Complementary Medicine, Department of Internal Medicine II, Freiburg University Hospital, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (A.M.); (A.-K.L.)
- Correspondence:
| | - Mauro Lombardo
- Department of Human Sciences and Promotion of the Quality of Life, San Raffaele Roma Open University, 00166 Rome, Italy;
| | - Gianluca Rizzo
- Independent Researcher, Via Venezuela 66, 98121 Messina, Italy;
| | - Alexander Müller
- Center for Complementary Medicine, Department of Internal Medicine II, Freiburg University Hospital, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (A.M.); (A.-K.L.)
| | - Ann-Kathrin Lederer
- Center for Complementary Medicine, Department of Internal Medicine II, Freiburg University Hospital, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany; (A.M.); (A.-K.L.)
- Department of General, Visceral and Transplantation Surgery, University Medical Center of the Johannes Gutenberg-University Mainz, 55116 Mainz, Germany
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10
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Gupta CC, Vincent GE, Coates AM, Khalesi S, Irwin C, Dorrian J, Ferguson SA. A Time to Rest, a Time to Dine: Sleep, Time-Restricted Eating, and Cardiometabolic Health. Nutrients 2022; 14:420. [PMID: 35276787 PMCID: PMC8840563 DOI: 10.3390/nu14030420] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/14/2022] [Accepted: 01/16/2022] [Indexed: 02/01/2023] Open
Abstract
Cardiovascular disease (CVD) poses a serious health and economic burden worldwide. Modifiable lifestyle factors are a focus of research into reducing the burden of CVD, with diet as one of the most investigated factors. Specifically, the timing and regularity of food intake is an emerging research area, with approaches such as time-restricted eating (TRE) receiving much attention. TRE involves shortening the time available to eat across the day and is associated with improved CVD outcomes compared with longer eating windows. However, studies that have examined TRE have not considered the impact of sleep on CVD outcomes despite recent evidence showing that sleep duration can influence the timing and amount of food eaten. In this article, we argue that as TRE and sleep influence each other, and influence the same cardiometabolic parameters, experiencing inadequate sleep may attenuate any positive impact TRE has on CVD. We examine the relationship between TRE and CVD, with sleep as a potential mediator in this relationship, and propose a research agenda to investigate this relationship. This will provide necessary evidence to inform future interventions aimed at reducing the burden of CVD.
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Affiliation(s)
- Charlotte C. Gupta
- Appleton Institute, Central Queensland University, Adelaide 5034, Australia; (G.E.V.); (S.A.F.)
| | - Grace E. Vincent
- Appleton Institute, Central Queensland University, Adelaide 5034, Australia; (G.E.V.); (S.A.F.)
| | - Alison M. Coates
- Alliance for Research in Exercise, Nutrition and Activity (ARENA) Research Centre, University of South Australia, Adelaide 5001, Australia;
- Behaviour-Brain-Body Research Centre, UniSA Justice and Society, University of South Australia, Adelaide 5072, Australia;
| | - Saman Khalesi
- Appleton Institute, Central Queensland University, Brisbane 4000, Australia;
| | - Christopher Irwin
- School of Health Sciences and Social Work, Griffith University, Gold Coast 4222, Australia;
| | - Jillian Dorrian
- Behaviour-Brain-Body Research Centre, UniSA Justice and Society, University of South Australia, Adelaide 5072, Australia;
| | - Sally A. Ferguson
- Appleton Institute, Central Queensland University, Adelaide 5034, Australia; (G.E.V.); (S.A.F.)
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11
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Boivin DB, Boudreau P, Kosmadopoulos A. Disturbance of the Circadian System in Shift Work and Its Health Impact. J Biol Rhythms 2021; 37:3-28. [PMID: 34969316 PMCID: PMC8832572 DOI: 10.1177/07487304211064218] [Citation(s) in RCA: 107] [Impact Index Per Article: 35.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The various non-standard schedules required of shift workers force abrupt changes in the timing of sleep and light-dark exposure. These changes result in disturbances of the endogenous circadian system and its misalignment with the environment. Simulated night-shift experiments and field-based studies with shift workers both indicate that the circadian system is resistant to adaptation from a day- to a night-oriented schedule, as determined by a lack of substantial phase shifts over multiple days in centrally controlled rhythms, such as those of melatonin and cortisol. There is evidence that disruption of the circadian system caused by night-shift work results not only in a misalignment between the circadian system and the external light-dark cycle, but also in a state of internal desynchronization between various levels of the circadian system. This is the case between rhythms controlled by the central circadian pacemaker and clock genes expression in tissues such as peripheral blood mononuclear cells, hair follicle cells, and oral mucosa cells. The disruptive effects of atypical work schedules extend beyond the expression profile of canonical circadian clock genes and affects other transcripts of the human genome. In general, after several days of living at night, most rhythmic transcripts in the human genome remain adjusted to a day-oriented schedule, with dampened group amplitudes. In contrast to circadian clock genes and rhythmic transcripts, metabolomics studies revealed that most metabolites shift by several hours when working nights, thus leading to their misalignment with the circadian system. Altogether, these circadian and sleep-wake disturbances emphasize the all-encompassing impact of night-shift work, and can contribute to the increased risk of various medical conditions. Here, we review the latest scientific evidence regarding the effects of atypical work schedules on the circadian system, sleep and alertness of shift-working populations, and discuss their potential clinical impacts.
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Affiliation(s)
- Diane B Boivin
- Centre for Study and Treatment of Circadian Rhythms, Douglas Mental Health University Institute, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - Philippe Boudreau
- Centre for Study and Treatment of Circadian Rhythms, Douglas Mental Health University Institute, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - Anastasi Kosmadopoulos
- Centre for Study and Treatment of Circadian Rhythms, Douglas Mental Health University Institute, Department of Psychiatry, McGill University, Montreal, QC, Canada
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12
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Oriyama S, Yamashita K. Effects of a snack on performance and errors during a simulated 16-h night shift: A randomized, crossover-controlled, pilot study. PLoS One 2021; 16:e0258569. [PMID: 34679125 PMCID: PMC8535457 DOI: 10.1371/journal.pone.0258569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 10/01/2021] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Night shift workers might not eat due to their busy schedules during the night shift. However, food may not only satisfy hunger, but also affect performance and errors. The aim of this study was to clarify the effect of a snack on performance and errors during 2-day, 16-h, simulated night shifts. METHODS A randomized, repeated-measure, crossover study was performed to investigate subjective and cognitive performance in 15 healthy female adults (mean age, 21.7 years) after they consumed a snack (352 kcal) during a simulated night shift (16:00 to 09:00) from October to November 2018. The participants were kept awake from waking up in the morning to the next day at 09:00. Subjects were tested for performance on the Uchida-Kraepelin test, as well as for subjective feeling, body temperature, psychomotor vigilance test, and heart rate variability, before and after they consumed the snack. One day before the experiment, all participants wore an actigraphy monitoring device to determine their sleep state. RESULTS There was no difference between having (Snack condition) and not having (Skipping condition) the snack in sleep states the day before the experiment. On the day of the experiment, between 16:00 and 09:00, subjective sleepiness, fatigue, and body temperature were not different between the two conditions. Subjects maintained performance on the Uchida-Kraepelin test and showed a significant improvement in false starts on the psychomotor vigilance test, the primary outcome measure, in the Snack condition compared with the Skipping condition. The Snack condition was also associated with decreased high-frequency power, a decreased low-frequency power/high-frequency power ratio, and increased heart rate in the vagally mediated heart rate variability indices, which may reflect a higher ability to modulate cognitive and behavioral processes. CONCLUSIONS These results suggest that providing a snack to shift workers during night shifts might improve work safety and efficiency.
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Affiliation(s)
- Sanae Oriyama
- Division of Nursing Science Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Kotomi Yamashita
- Doctoral Program in Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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13
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D’Annibale M, Hornzee N, Whelan M, Guess N, Hall W, Gibson R. Eating on the night shift: A need for evidence‐based dietary guidelines? NUTR BULL 2021. [DOI: 10.1111/nbu.12515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Maria D’Annibale
- Department of Nutritional Sciences King’s College London London UK
| | - Nicky Hornzee
- Department of Nutritional Sciences King’s College London London UK
| | - Megan Whelan
- Department of Nutritional Sciences King’s College London London UK
- Work Ready Group British Dietetic Association Birmingham UK
| | - Nicola Guess
- Department of Nutritional Sciences King’s College London London UK
- Research Centre for Optimal Health University of Westminster London UK
| | - Wendy Hall
- Department of Nutritional Sciences King’s College London London UK
| | - Rachel Gibson
- Department of Nutritional Sciences King’s College London London UK
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14
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Chang WP, Peng YX. Differences between fixed day shift workers and rotating shift workers in gastrointestinal problems: a systematic review and meta-analysis. INDUSTRIAL HEALTH 2021; 59:66-77. [PMID: 33408309 PMCID: PMC8010167 DOI: 10.2486/indhealth.2020-0153] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 12/25/2020] [Indexed: 06/12/2023]
Abstract
This study comprised a review and compilation of literature to gain an in-depth understanding of the impact of rotating shift work on gastrointestinal health. PubMed, CINAHL, and the Cochrane Library were searched for studies published between January 1, 1985, and June 30, 2020. Fixed day shifts were defined as work shifts that began between 7:00 and 9:00 in the morning. Shifts beginning at any other time were classified as rotating shifts. A meta-analysis was performed using Comprehensive Meta-Analysis Software (CMA) version 3. In the end, 16 studies were included in the meta-analysis. An odds ratio (OR) of 1.56 (95% confidence interval (CI): 1.24-1.95), indicating that gastrointestinal problems are more common in rotating shift workers than in fixed day shift workers. Four gastrointestinal problems, namely, irritable bowel syndrome, constipation, indigestion, and peptic ulcers, were then analyzed separately. Significant differences between rotating shift workers and fixed day shift workers were found only for indigestion and peptic ulcers. For indigestion, the OR was 1.72 (95% CI: 1.28-2.30). For peptic ulcers, the OR was 1.66 (95% CI: 1.19-2.30). Thus, research indicates that rotating shift work may increase the risk of gastrointestinal problems, particularly indigestion and peptic ulcers.
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Affiliation(s)
- Wen-Pei Chang
- School of Nursing, College of Nursing, Taipei Medical University, Taiwan
- Department of Nursing, Shuang Ho Hospital, Taipei Medical University, Taiwan
| | - Yu-Xuan Peng
- Department of Nursing, College of Nursing, Tzu Chi University, Taiwan
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15
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de Rijk MG, van Eekelen APJ, Kaldenberg E, Boesveldt S, Te Woerd W, Holwerda T, Lansink CJM, Feskens EJM, de Vries JHM. The association between eating frequency with alertness and gastrointestinal complaints in nurses during the night shift. J Sleep Res 2021; 30:e13306. [PMID: 33622018 PMCID: PMC8518800 DOI: 10.1111/jsr.13306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 11/14/2020] [Accepted: 01/20/2021] [Indexed: 12/05/2022]
Abstract
We investigated the association of the number of eating occasions and energy intake with alertness and gastrointestinal (GI) complaints in nurses during their night shift. During this observational study we collected data on anthropometrics and demographics, eating frequency, energy intake, alertness and GI complaints in 118 healthy female nurses, aged 20 to 61 years. Nurses completed an alertness test (psychomotor vigilance task) during the night shift and a 24‐hr dietary recall and a questionnaire about GI complaints after the night shift. This was repeated three times, always on the first night shift in a night shift series. The number of eating occasions during the night shift was negatively associated with reaction times (β = −4.81 ms, 95% confidence interval [CI] −9.14 to −0.48; p = .030), and number of lapses (β = −0.04, 95% CI −0.07 to −0.00; p = .030). However, the number of eating occasions was not associated with subjective alertness and GI complaints. Energy intake during the night shift was not associated with objective or subjective alertness or with GI complaints. These associations were independent of caffeine intake, age, body mass index and dependence among the repeated measurements. The present study showed that eating frequency was positively associated with objectively measured alertness levels in female nurses during the night shift. The results need to be confirmed in an intervention study, where also timing, size and composition of the meal will be taken into account. In practice, optimising nutritional guidelines on these aspects could lead to faster responses, less (medical) errors, and a better wellbeing of night shift workers.
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Affiliation(s)
- Mariëlle G de Rijk
- Division of Human Nutrition and Health, Wageningen University and Research, Wageningen, the Netherlands
| | | | | | - Sanne Boesveldt
- Division of Human Nutrition and Health, Wageningen University and Research, Wageningen, the Netherlands
| | | | | | | | - Edith J M Feskens
- Division of Human Nutrition and Health, Wageningen University and Research, Wageningen, the Netherlands
| | - Jeanne H M de Vries
- Division of Human Nutrition and Health, Wageningen University and Research, Wageningen, the Netherlands
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16
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Gupta CC, Centofanti S, Dorrian J, Coates AM, Stepien JM, Kennaway D, Wittert G, Heilbronn L, Catcheside P, Tuckwell GA, Coro D, Chandrakumar D, Banks S. The impact of a meal, snack, or not eating during the night shift on simulated driving performance post-shift. Scand J Work Environ Health 2021; 47:78-84. [PMID: 33190160 PMCID: PMC7801136 DOI: 10.5271/sjweh.3934] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Indexed: 11/15/2022] Open
Abstract
Objective The commute home following a night shift is associated with an increased risk for accidents. This study investigated the relationship between food intake during the night shift and simulated driving performance post-shift. Methods Healthy non-shift working males (N=23) and females (N=16), aged 18-39 years (mean 24.5, standard deviation 5.0, years) participated in a seven-day laboratory study and underwent four simulated night shifts. Participants were randomly allocated to one of three conditions: meal at night (N=12; 7 males), snack at night (N=13; 7 males) or no eating at night (N=14; 9 males). During the night shift at 00:30 hours, participants either ate a large meal (meal at night condition), a snack (snack at night condition), or did not eat during the night shift (no eating at night condition). During the second simulated night shift, participants performed a 40-minute York driving simulation at 20:00, 22:30, 01:30, 04:00, and 07:30 hours (similar time to a commute from work). Results The effects of eating condition, drive time, and time-on-task, on driving performance were examined using mixed model analyses. Significant condition×time interactions were found, where at 07:30 hours, those in the meal at night condition displayed significant increases in time spent outside of the safe zone (percentage of time spent outside 10 km/hour of the speed limit and 0.8 meters of the lane center; P<0.05), and greater lane and speed variability (both P<0.01) compared to the snack and no eating conditions. There were no differences between the snack and no eating conditions. Conclusion Driver safety during the simulated commute home is greater following the night shift if a snack, rather than a meal, is consumed during the shift.
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Affiliation(s)
- Charlotte C Gupta
- Appleton Institute, Central Queensland University, 44 Greenhill Road, Wayville 5034, Adelaide, Australia.
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17
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Bahramirad F, Heshmatifar N, Rad M. Students' perception of problems and benefits of night shift nursing internship: A qualitative study. JOURNAL OF EDUCATION AND HEALTH PROMOTION 2020; 9:287. [PMID: 33282992 PMCID: PMC7709763 DOI: 10.4103/jehp.jehp_227_20] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 05/15/2020] [Indexed: 06/12/2023]
Abstract
INTRODUCTION Recently, the night shift is included in the curriculum of nursing internship students. However, this shift is associated with some problems and benefits for students, which have been assessed in limited studies. This study aimed to discover and describe the problems and benefits of the night shift for nursing internship students. METHODOLOGY This qualitative method was carried out with the conventional content-analysis method. In total, 15 seventh-semester and eighth-semester nursing students at Sabzevar University of Medical Sciences, Iran, were selected by purposeful sampling. Data were collected using in-depth semi-structured interviews about students' perceptions of night shift problems and benefits. In addition, data analysis was performed applying the conventional content-analysis technique. RESULTS In this study, seven main categories were extracted, five of which included problems such as exploitations, being an outsider, moral distress, learning deficits, and annoyance. The other two categories were benefits including gaining new experiences and independence. CONCLUSION The problems related to the students were the nursing personnel and the educational system of hospitals, which can be dealt with through the interaction of the educational system with hospitals managers in order to clarifying the role of students, fair division of work, and making educational resources available. Moreover, gaining new experiences and independence are among the benefits of the night shift for students, the continuation of which is in favor of nursing education.
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Affiliation(s)
- Farhad Bahramirad
- Department of Nursing, Student Research Committee, School of Nursing and Midwifery, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Narjes Heshmatifar
- Department of Nursing, School of Nursing and Midwifery, Iranian Research Center on Healthy Aging, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Mostafa Rad
- Department of Nursing, Nursing and Midwifery School, Iranian Research Center on Healthy Aging, Sabzevar University of Medical Sciences, Sabzevar, Iran
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18
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Chandrakumar D, Dorrian J, Banks S, Keage HAD, Coussens S, Gupta C, Centofanti SA, Stepien JM, Loetscher T. The relationship between alertness and spatial attention under simulated shiftwork. Sci Rep 2020; 10:14946. [PMID: 32917940 PMCID: PMC7486912 DOI: 10.1038/s41598-020-71800-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 07/22/2020] [Indexed: 01/28/2023] Open
Abstract
Higher and lower levels of alertness typically lead to a leftward and rightward bias in attention, respectively. This relationship between alertness and spatial attention potentially has major implications for health and safety. The current study examined alertness and spatial attention under simulated shiftworking conditions. Nineteen healthy right-handed participants (M = 24.6 ± 5.3 years, 11 males) completed a seven-day laboratory based simulated shiftwork study. Measures of alertness (Stanford Sleepiness Scale and Psychomotor Vigilance Task) and spatial attention (Landmark Task and Detection Task) were assessed across the protocol. Detection Task performance revealed slower reaction times and higher omissions of peripheral (compared to central) stimuli, with lowered alertness; suggesting narrowed visuospatial attention and a slight left-sided neglect. There were no associations between alertness and spatial bias on the Landmark Task. Our findings provide tentative evidence for a slight neglect of the left side and a narrowing of attention with lowered alertness. The possibility that one’s ability to sufficiently react to information in the periphery and the left-side may be compromised under conditions of lowered alertness highlights the need for future research to better understand the relationship between spatial attention and alertness under shiftworking conditions.
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Affiliation(s)
- D Chandrakumar
- Behaviour-Brain-Body Research Centre, Justice & Society, University of South Australia, Adelaide, SA, Australia.
| | - J Dorrian
- Behaviour-Brain-Body Research Centre, Justice & Society, University of South Australia, Adelaide, SA, Australia
| | - S Banks
- Behaviour-Brain-Body Research Centre, Justice & Society, University of South Australia, Adelaide, SA, Australia
| | - H A D Keage
- Behaviour-Brain-Body Research Centre, Justice & Society, University of South Australia, Adelaide, SA, Australia
| | - S Coussens
- Behaviour-Brain-Body Research Centre, Justice & Society, University of South Australia, Adelaide, SA, Australia
| | - C Gupta
- Appleton Institute, Central Queensland University, Health, Medical and Applied Sciences, Adelaide, SA, Australia
| | - S A Centofanti
- University of South Australia Online, Adelaide, SA, Australia
| | - J M Stepien
- Behaviour-Brain-Body Research Centre, Justice & Society, University of South Australia, Adelaide, SA, Australia
| | - T Loetscher
- Behaviour-Brain-Body Research Centre, Justice & Society, University of South Australia, Adelaide, SA, Australia
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19
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Silva CM, Cunha NBD, Mota MC, Marot LP, Teixeira KRC, Cunha TM, Crispim CA. Effect of consuming a late-night high-protein/moderate-carbohydrate vs. low-protein/high-carbohydrate meal by night workers on their food perceptions later during the day: a randomized crossover study. Chronobiol Int 2020; 37:1392-1399. [PMID: 32854537 DOI: 10.1080/07420528.2020.1807561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
It is typical of night workers to consume a large dinner meal before their work shift, even though this practice may increase the risk for metabolic disorders. Night workers usually eat at night to socialize with colleagues as well as to stay alert and to avoid upset stomach during the night shift. However, little is known if and how the composition of the nighttime meal by night shift workers influences their food perceptions and eating behavior later during the day. The aim of this study was to analyze the effect of a high-protein/moderate-carbohydrate (HP/MCHO) meal vs. low-protein/high-carbohydrate (LP/HCHO) meal eaten at night by night-shift workers on their food consumption and perceptions later during the day. Fourteen male night shift workers were followed-up for 7 days for their eating and sleep habits. Then, participants underwent two isocaloric dietary events - one event a HP/MCHO meal containing 45% carbohydrate, 35% protein, and 20% fat and the other event a LP/HCHO meal containing 65% carbohydrate, 15% protein, and 20% fat, with a 6-day washout period between them - at 01:00 h during their night shift. Thereafter throughout the day, participants filled a food register of all the food consumed and perceptions, including hunger before meals, enjoyment of meals, and satiety. Generalized estimating equation analyses were used to examine the effect of both conditions on food consumption and food perceptions. Appetite for salty food snacks was greater after the HP/MCHO condition than after the LP/HCHO condition (p = .041). During the day following consumption of the nighttime HP/MCHO vs. LP/HCHO meal, there was higher percentage of carbohydrate consumption during lunch and a lower percentage of fat consumption during dinner (48.14% vs. 36.98% and 27.34% vs. 40.39%, respectively). These findings suggest the composition in terms of carbohydrates, protein, and fats of the meal consumed for the night shift by night workers may affect later during the day both food consumption and perceptions.
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Affiliation(s)
- Catarina Mendes Silva
- Graduate Program of Health Sciences, Faculty of Medicine, Federal University of Uberlândia, Minas Gerais, Brazil
| | - Nayara Bernardes Da Cunha
- Graduate Program of Health Sciences, Faculty of Medicine, Federal University of Uberlândia, Minas Gerais, Brazil
| | - Maria Carliana Mota
- Graduate Program of Health Sciences, Faculty of Medicine, Federal University of Uberlândia, Minas Gerais, Brazil
| | - Luisa Pereira Marot
- Graduate Program of Health Sciences, Faculty of Medicine, Federal University of Uberlândia, Minas Gerais, Brazil
| | | | - Thulio Marquez Cunha
- Graduate Program of Health Sciences, Faculty of Medicine, Federal University of Uberlândia, Minas Gerais, Brazil
| | - Cibele Aparecida Crispim
- Graduate Program of Health Sciences, Faculty of Medicine, Federal University of Uberlândia, Minas Gerais, Brazil
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20
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Potter GDM, Wood TR. The Future of Shift Work: Circadian Biology Meets Personalised Medicine and Behavioural Science. Front Nutr 2020; 7:116. [PMID: 32850937 PMCID: PMC7426458 DOI: 10.3389/fnut.2020.00116] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 06/22/2020] [Indexed: 12/15/2022] Open
Abstract
Shift work is commonplace in modern societies, and shift workers are predisposed to the development of numerous chronic diseases. Disruptions to the circadian systems of shift workers are considered important contributors to the biological dysfunction these people frequently experience. Because of this, understanding how to alter shift work and zeitgeber (time cue) schedules to enhance circadian system function is likely to be key to improving the health of shift workers. While light exposure is the most important zeitgeber for the central clock in the circadian system, diet and exercise are plausible zeitgebers for circadian clocks in many tissues. We know little about how different zeitgebers interact and how to tailor zeitgeber schedules to the needs of individuals; however, in this review we share some guidelines to help shift workers adapt to their work schedules based on our current understanding of circadian biology. We focus in particular on the importance of diet timing and composition. Going forward, developments in phenotyping and "envirotyping" methods may be important to understanding how to optimise shift work. Non-invasive, multimodal, comprehensive phenotyping using multiple sources of time-stamped data may yield insights that are critical to the care of shift workers. Finally, the impact of these advances will be reduced without modifications to work environments to make it easier for shift workers to engage in behaviours conducive to their health. Integrating findings from behavioural science and ergonomics may help shift workers make healthier choices, thereby amplifying the beneficial effects of improved lifestyle prescriptions for these people.
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Affiliation(s)
| | - Thomas R Wood
- Division of Neonatology, Department of Pediatrics, University of Washington, Seattle, WA, United States.,Division of Human Health, Performance and Resilience, Institute for Human and Machine Cognition, Pensacola, FL, United States
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21
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Huecker MR, Shreffler J, Ferguson B. Sleep deprivation hormesis: The shift that doesn't kill you makes you stronger. Am J Emerg Med 2020; 39:223-224. [PMID: 32482482 DOI: 10.1016/j.ajem.2020.04.092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 04/27/2020] [Accepted: 04/28/2020] [Indexed: 10/24/2022] Open
Affiliation(s)
- Martin R Huecker
- University of Louisville, Department of Emergency Medicine, 550 South Jackson, Louisville, KY 40202, United States of America.
| | - Jacob Shreffler
- University of Louisville, Department of Emergency Medicine, 550 South Jackson, Louisville, KY 40202, United States of America
| | - Brian Ferguson
- University of Louisville, Department of Emergency Medicine, 550 South Jackson, Louisville, KY 40202, United States of America
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22
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Gupta CC, Centofanti S, Dorrian J, Coates A, Stepien JM, Kennaway D, Wittert G, Heilbronn L, Catcheside P, Noakes M, Coro D, Chandrakumar D, Banks S. Altering meal timing to improve cognitive performance during simulated nightshifts. Chronobiol Int 2019; 36:1691-1713. [DOI: 10.1080/07420528.2019.1676256] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Charlotte C Gupta
- Behaviour-Brain-Body Research Centre, School of Psychology, Social Work and Social Policy, University of South Australia, Adelaide, Australia
| | - Stephanie Centofanti
- Behaviour-Brain-Body Research Centre, School of Psychology, Social Work and Social Policy, University of South Australia, Adelaide, Australia
- University of South Australia Online, University of South Australia, Adelaide, Australia
| | - Jillian Dorrian
- Behaviour-Brain-Body Research Centre, School of Psychology, Social Work and Social Policy, University of South Australia, Adelaide, Australia
| | - Alison Coates
- Behaviour-Brain-Body Research Centre, School of Psychology, Social Work and Social Policy, University of South Australia, Adelaide, Australia
- Division of Health Sciences, University of South Australia, Adelaide, Australia
| | - Jacqueline M Stepien
- Behaviour-Brain-Body Research Centre, School of Psychology, Social Work and Social Policy, University of South Australia, Adelaide, Australia
| | - David Kennaway
- Robinson Research Institute and Adelaide School of Medicine, University of Adelaide, Adelaide, Australia
| | - Gary Wittert
- Discipline of Medicine, Adelaide Medical School, University of Adelaide, Adelaide, Australia
| | - Leonie Heilbronn
- Discipline of Medicine, Adelaide Medical School, University of Adelaide, Adelaide, Australia
- South Australia Medical Research Institute (SAHMRI), Adelaide, Australia
| | - Peter Catcheside
- Adelaide Institute for Sleep Health, College of Medicine and Public Health, Flinders University, Adelaide Australia
| | - Manny Noakes
- Food and Nutrition Flagship, Commonwealth Scientific and Industrial Research Organization, Adelaide, Australia
| | - Daniel Coro
- Behaviour-Brain-Body Research Centre, School of Psychology, Social Work and Social Policy, University of South Australia, Adelaide, Australia
| | - Dilushi Chandrakumar
- Behaviour-Brain-Body Research Centre, School of Psychology, Social Work and Social Policy, University of South Australia, Adelaide, Australia
| | - Siobhan Banks
- Behaviour-Brain-Body Research Centre, School of Psychology, Social Work and Social Policy, University of South Australia, Adelaide, Australia
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