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Dial MB, Malek EM, Cooper AR, Neblina GA, Vasileva NI, Hines DJ, McGinnis GR. Social jet lag impairs exercise volume and attenuates physiological and metabolic adaptations to voluntary exercise training. J Appl Physiol (1985) 2024; 136:996-1006. [PMID: 38450426 PMCID: PMC11305643 DOI: 10.1152/japplphysiol.00632.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 01/31/2024] [Accepted: 02/26/2024] [Indexed: 03/08/2024] Open
Abstract
Social jet lag (SJL) is a misalignment between sleep and wake times on workdays and free days. SJL leads to chronic circadian rhythm disruption and may affect nearly 70% of the general population, leading to increased risk for cardiometabolic diseases. This study investigated the effects of SJL on metabolic health, exercise performance, and exercise-induced skeletal muscle adaptations in mice. Ten-week-old C57BL/6J mice (n = 40) were allocated to four groups: control sedentary (CON-SED), control exercise (CON-EX), social jet lag sedentary (SJL-SED), and social jet lag exercise (SJL-EX). CON mice were housed under a 12:12-h light-dark cycle. SJL was simulated by implementing a 4-h phase delay for 3 days to simulate "weekends," followed by a 4-h phase advance back to "weekdays," for 6 wk. EX mice had free access to a running wheel. Graded exercise tests (GXTs) and glucose tolerance tests (GTTs) were performed at baseline and after intervention to monitor the effects of exercise and social jet lag on cardiorespiratory and metabolic health, respectively. SJL led to alterations in activity and running patterns and clock gene expression in skeletal muscle and decreased average running distance (P < 0.05). SJL-SED mice gained significantly more weight compared with CON-SED and SJL-EX mice (P < 0.01). SJL impaired fasting blood glucose and glucose tolerance compared with CON mice (P < 0.05), which was partially restored by exercise in SJL-EX mice. SJL also blunted improvements in exercise performance and mitochondrial content in the quadriceps. These data suggest that SJL blunted some cardiometabolic adaptations to exercise and that proper circadian hygiene is necessary for maintaining health and performance.NEW & NOTEWORTHY In mice, disrupting circadian rhythms with social jet lag for 6 wk caused significant weight gain, higher fasting blood glucose, and impaired glucose tolerance compared with control. Voluntary exercise in mice experiencing social jet lag prevented weight gain, though the mice still experienced increased fasting blood glucose and impaired exercise performance compared with trained mice not experiencing social jet lag. Social jet lag seems to be a potent circadian rhythm disruptor that impacts exercise-induced training adaptations.
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Affiliation(s)
- Michael B Dial
- Department of Kinesiology and Nutrition Sciences, School of Integrated Health Sciences, University of Nevada, Las Vegas, Nevada, United States
| | - Elias M Malek
- Department of Kinesiology and Nutrition Sciences, School of Integrated Health Sciences, University of Nevada, Las Vegas, Nevada, United States
| | - Austin R Cooper
- Department of Kinesiology and Nutrition Sciences, School of Integrated Health Sciences, University of Nevada, Las Vegas, Nevada, United States
| | - Greco A Neblina
- Department of Kinesiology and Nutrition Sciences, School of Integrated Health Sciences, University of Nevada, Las Vegas, Nevada, United States
| | - Nikoleta I Vasileva
- Department of Kinesiology and Nutrition Sciences, School of Integrated Health Sciences, University of Nevada, Las Vegas, Nevada, United States
| | - Dustin J Hines
- Department of Psychology, Psychological and Brain Sciences and Interdisciplinary Neuroscience Programs, University of Nevada, Las Vegas, Nevada, United States
| | - Graham R McGinnis
- Department of Kinesiology and Nutrition Sciences, School of Integrated Health Sciences, University of Nevada, Las Vegas, Nevada, United States
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Sooriyaarachchi P, Jayawardena R, Pavey T, King NA. Shift Work is Associated with an Elevated White Blood Cell Count: A Systematic Review and Meta-Analysis. Indian J Occup Environ Med 2023; 27:278-285. [PMID: 38390477 PMCID: PMC10880826 DOI: 10.4103/ijoem.ijoem_326_22] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 04/16/2023] [Accepted: 05/14/2023] [Indexed: 02/24/2024] Open
Abstract
The white blood cell (WBC) count increases significantly in reaction to infections and certain chronic diseases. Shift employment increases the risk for chronic low-grade inflammation and the progression of several chronic diseases. The objective of this study was to systematically evaluate the evidence from studies on total and differential WBC counts in shift employees. A literature search was performed in PubMed®, Web of Science, and Scopus databases using keywords for research published before March 1, 2022. A meta-analysis was conducted for total and differential WBC counts using a random-effects approach. A total of 25 studies covering a sample of 37,708 day and shift employees were included in this review. The studies represented America, Europe, East Asia, and Middle East. A significant increase in the total counts (×109/L) of WBC [mean difference (MD) = 0.43; 95% confidence interval (CI): 0.34-0.52; P < 0.001], lymphocytes (MD = 0.16; 95% CI: 0.02-0.30; P = 0.02), monocytes (MD = 0.04; 95% CI: 0-0.07; P = 0.03), and eosinophils (MD = 0.01; 95% CI: 0-0.01; P = 0.03) was observed in shift workers compared to the day counterparts. However, neutrophils and basophils were not significantly different between the groups. Shift work significantly increases the total and differential blood counts in peripheral circulation. Therefore, total and differential WBC counts represent a relatively inexpensive biomarker for diagnostics and prognostics of diseases in shift workers.
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Affiliation(s)
- Piumika Sooriyaarachchi
- Queensland University of Technology (QUT), Faculty of Health, School of Exercise and Nutrition Sciences, Brisbane, Queensland, Australia
- Health and Wellness Unit, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka
| | - Ranil Jayawardena
- Queensland University of Technology (QUT), Faculty of Health, School of Exercise and Nutrition Sciences, Brisbane, Queensland, Australia
- Department of Physiology, Faculty of Medicine, Colombo, Sri Lanka
| | - Toby Pavey
- Queensland University of Technology (QUT), Faculty of Health, School of Exercise and Nutrition Sciences, Brisbane, Queensland, Australia
| | - Neil A. King
- Queensland University of Technology (QUT), Faculty of Health, School of Exercise and Nutrition Sciences, Brisbane, Queensland, Australia
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Ferguson JM, Bradshaw PT, Eisen EA, Rehkopf D, Cullen MR, Costello S. Distribution of working hour characteristics by race, age, gender, and shift schedule among U.S. manufacturing workers. Chronobiol Int 2023; 40:310-323. [PMID: 36691907 DOI: 10.1080/07420528.2023.2168200] [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: 01/25/2023]
Abstract
Shift work is a common occupational exposure, however, few studies have examined aspects of shift work beyond night work and long hours, such as rotational patterns or weekend work, which may contribute to poor health through disruption of the body's circadian rhythms. In this manuscript, we calculated the prevalence of working hour characteristics using algorithms for type (e.g., day), duration, intensity, rotational direction, and social aspects (e.g., weekend work) in a nationwide cohort of American manufacturing workers (N = 23,044) between 2003 and 2014. Distributions of working hour characteristics were examined by schedules (e.g., permanent day, day/night) and demographics, and were cross-classified in a matrix to examine co-occurrence. Approximately 55% of shifts may cause circadian rhythm disruption as they were non-day shifts or day shifts with a quick return or rotation, or were 13 h or longer. Older workers, female workers, and White workers worked permanent day shifts most often, while workers of color worked more day/night schedules. Night and evening shifts had more frequent shift rotations, quick returns, and longer hours than day shifts. Yet, day shifts, which are presumed to have little negative circadian impact, may cause circadian rhythm disruption as long hours, quick returns and rotations also occurred within day shifts.
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Affiliation(s)
- Jacqueline M Ferguson
- Division of Environmental Health Sciences, School of Public Health, University of California Berkeley, Berkeley, California, USA.,Department of Epidemiology and Population Health, Stanford University, Stanford, California, USA
| | - Patrick T Bradshaw
- Division of Epidemiology and Biostatistics, School of Public Health, University of California Berkeley, Berkeley, California, USA
| | - Ellen A Eisen
- Division of Environmental Health Sciences, School of Public Health, University of California Berkeley, Berkeley, California, USA
| | - David Rehkopf
- Department of Epidemiology and Population Health, Stanford University, Stanford, California, USA
| | - Mark R Cullen
- Department of Epidemiology and Population Health, Stanford University, Stanford, California, USA
| | - Sadie Costello
- Division of Environmental Health Sciences, School of Public Health, University of California Berkeley, Berkeley, California, USA
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Night shift work characteristics are associated with several elevated metabolic risk factors and immune cell counts in a cross-sectional study. Sci Rep 2022; 12:2022. [PMID: 35132155 PMCID: PMC8821707 DOI: 10.1038/s41598-022-06122-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 01/21/2022] [Indexed: 11/25/2022] Open
Abstract
Night shift work is associated with increased health risks. Here we examined the association of metabolic risk factors and immune cell counts, with both night shift work and particular characteristics thereof: frequency, duration and consecutive night shifts. We performed a cross-sectional study using data from 10,201 non-shift workers and 1062 night shift workers of the Lifelines Cohort study. Linear regression analyses, adjusted for demographic, lifestyle and occupational factors, were used to study associations of night shift work characteristics with metabolic risk factors and immune cell counts. Night shift workers had an increased BMI, waist circumference and immune cell counts compared to non-shift workers. This was especially seen in night shift workers who had a higher frequency of night shifts per month (≥ 5: BMI: B = 0.81 kg/m2 (95%-CI = 0.43–1.10); waist circumference: B = 1.58 cm (95%-Cl = 0.34–1.71; leukocytes: B = 0.19 × 109 cells/L (95%-CI = 0.04–0.34 × 109)) and worked more consecutive night shifts (> 3: BMI: B = 0.92 kg/m2 (95%-CI = 0.41–1.43); waist circumference: B = 1.85 cm (95%-Cl = 0.45–3.24); leukocytes: B = 0.32 × 109 cells/L (95%-CI = 0.09–0.55 × 109)). This association was less pronounced in long-term night shift workers (≥ 20 years). Our findings provide evidence for the association between night shift work characteristics and BMI, waist circumference and leukocytes (including, monocytes, lymphocytes, and basophil granulocytes).
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A Simulated Shift Work Schedule Does Not Increase DNA Double-Strand Break Repair by NHEJ in the Drosophila Rr3 System. Genes (Basel) 2022; 13:genes13010150. [PMID: 35052490 PMCID: PMC8774994 DOI: 10.3390/genes13010150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 01/09/2022] [Accepted: 01/10/2022] [Indexed: 11/29/2022] Open
Abstract
Long-term shift work is widely believed to increase the risk of certain cancers, but conflicting findings between studies render this association unclear. Evidence of interplay between the circadian clock, cell cycle regulation, and DNA damage detection machinery suggests the possibility that circadian rhythm disruption consequent to shift work could alter the DNA double-strand break (DSB) repair pathway usage to favor mutagenic non-homologous end-joining (NHEJ) repair. To test this hypothesis, we compared relative usage of NHEJ and single-strand annealing (SSA) repair of a complementary ended chromosomal double-stranded break using the Repair Reporter 3 (Rr3) system in Drosophila between flies reared on 12:12 and 8:8 (simulated shift work) light:dark schedules. Actimetric analysis showed that the 8:8 light:dark schedule effectively disrupted the rhythms in locomotor output. Inaccurate NHEJ repair was not a frequent outcome in this system overall, and no significant difference was seen in the usage of NHEJ or SSA repair between the control and simulated shift work schedules. We conclude that this circadian disruption regimen does not alter the usage of mutagenic NHEJ DSB repair in the Drosophila male pre-meiotic germline, in the context of the Rr3 system.
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Association between metabolic syndrome and shift work in chemical plant workers. Ann Occup Environ Med 2021; 33:e31. [PMID: 34868601 PMCID: PMC8602806 DOI: 10.35371/aoem.2021.33.e31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 10/05/2021] [Indexed: 11/29/2022] Open
Abstract
Background The study aimed to determine the association between shift work and metabolic syndrome and the prevalence of metabolic syndrome in the shift and day work groups among workers working in chemical plants. Methods Based on medical examination data collected in February 2019, 3,794 workers working at a chemical plant in Korea were selected. Multiple logistic regression analysis was performed by adjusting for age, sex, body mass index (BMI), drinking, exercise, smoking, employment period and organic compounds exposure. Results The prevalence of metabolic syndrome in the entire study group was 23.4%, and the prevalence and components of metabolic syndrome in shift worker; waist circumference were higher than those of day workers (84.77 ± 8.64 vs. 83.41 ± 9.42, p < 0.001), systolic blood pressure (129.89 ± 9.47 vs. 127.57 ± 9.47, p < 0.001), diastolic blood pressure (81.22 ± 7.59 vs. 79.34 ± 7.46, p < 0.001), fasting blood glucose (99.27 ± 17.13 vs. 97.87 ± 13.07, p = 0.007), triglycerides (149.70 ± 101.15 vs. 133.55 ± 105.17, p < 0.001), and decreased high-density lipoprotein (53.18 ± 12.82 vs. 55.61 ± 14.17, p < 0.001). As a result of logistic regression analysis on the risk of metabolic syndrome, even after adjusting for age, sex BMI, drinking, smoking, exercise, employment period, organic compound exposure. the odds ratio (OR) for the shift group was 1.300 for daytime workers (Model 1, OR: 1.491; 95% confidence interval [CI]: 1.273–1.747; Model 2, OR: 1.260; 95% CI: 1.070–1.483; Model 3, OR: 1.309, 95% CI: 1.081–1.585; Model 4, OR: 1.300; 95% CI: 1.063–1.591). Conclusions Shift work in chemical plant workers increased the risk of metabolic syndrome, even after adjusting for general factors. To analyze the occupational cause and risk control, it is necessary to analyze the hazardous substances the workers were exposed to and their working environment. Additionally, a large-scale prospective analysis including general factors not analyzed in this study, such as eating habits, is required.
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Banerjee P, Reddy BG, Gavaravarapu SM. Identifying opportunities and barriers for introducing a workplace nutrition and health program for employees: Findings from formative research. Work 2021; 73:1175-1187. [DOI: 10.3233/wor-211017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND: The work style of employees engaged in the Information Technology (IT) and Business Process Outsourcing (BPO) sector in India is dominantly sedentary exposing them to detrimental obesogenic environments with unhealthy diets, increasing the risk of non-communicable diseases (NCDs). Workplace health interventions have been reported to have the potential of reducing NCDs and related risk factors among the employees and thus reduce cost of absenteeism and improve productivity. OBJECTIVE: This formative research study aims to explore the opportunities and barriers of the development and implementation of a Workplace Health Programme (WHP). METHODS: In this study, a mixed method including qualitative and quantitative approaches were used. Focus group discussions (FGDs) were conducted with employees and senior managers in employers of IT/BPO companies of different sizes in Hyderabad, India. The food and physical activity environment in the workplaces were explored using a checklist and ground truthing approach. A Knowledge, Attitudes and Practices (KAP) questionnaire was developed to assess health, nutrition and physical activity of the employees. RESULTS: Through this formative research, the required areas for nutrition, physical activity and health education were identified. The scopes of utilising existing facilities for physical activity and modifying the food environment was explored. We noted optimistic bias among the junior employees who did not consider themselves at risk of developing NCDs. CONCLUSIONS: The identified opportunities and barriers will help in developing strategic WHPs suitable to individual workplaces. The qualitative methods, ground truthing approach, checklist and KAP tools used here can assess the company environment and employee health and nutrition status.
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Affiliation(s)
- Paromita Banerjee
- Nutrition Information, Communication & Health Education (NICHE) Division, ICMR-National Institute of Nutrition, Hyderabad, Telangana, India
| | - Bhanuprakash G. Reddy
- Biochemistry Division, ICMR-National Institute of Nutrition, Hyderabad, Telangana, India
| | - SubbaRao M. Gavaravarapu
- Nutrition Information, Communication & Health Education (NICHE) Division, ICMR-National Institute of Nutrition, Hyderabad, Telangana, India
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Wang Y, Yu L, Gao Y, Jiang L, Yuan L, Wang P, Cao Y, Song X, Ge L, Ding G. Association between shift work or long working hours with metabolic syndrome: a systematic review and dose-response meta-analysis of observational studies. Chronobiol Int 2021; 38:318-333. [PMID: 33557625 DOI: 10.1080/07420528.2020.1797763] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
This meta-analysis investigates the relationship between both shift work and long working hours and risk of developing metabolic syndrome (MetS). PubMed, EMBASE, and Web of Science databases were searched from the outset to December 10, 2019. Two reviewers independently screened studies, extracted data, and assessed the risk of bias of included studies. A total of 36 (30 cross-sectional, 5 cohort, and a nested case-control) studies, involving 274,263 participants, were included. The pooled odds ratio of shift work and development of MetS was 1.35 (95% confidence interval: 1.24-1.48), and the pooled odds ratio of long working hours and development of MetS was 1.19 (95% confidence interval: 0.97-1.46). In the subgroup analysis stratified by gender, the pooled odds ratios for male and female shift workers were 1.25 (95% confidence interval: 1.14-1.37) and 1.47 (95% confidence interval: 1.18-1.82), respectively. The dose-response (number of years of shift work and development of MetS) analysis showed the pooled odds ratio for 5 years of shift work was 1.07 (95% confidence interval: 1.05-1.09) and for 10 years of shift work 1.11 (95% confidence interval: 1.06-1.15). Our meta-analysis confirmed shift work is significantly associated with risk of metabolic syndrome, but the relationship between long working hours and MetS was not substantiated. Additionally, there was a nonlinear dose-response relationship between the number of years of shift work and risk of MetS, showing positive relationship to about 20 years of shift work but not for longer than 20 years. Prospective cohort studies regarding specific shift work schedules are needed to confirm these results.
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Affiliation(s)
- Yihui Wang
- Department of Social Medicine and Health Administration, School of Public Health, Lanzhou University, Gansu, China
| | - Li Yu
- Department of Social Medicine and Health Administration, School of Public Health, Lanzhou University, Gansu, China
| | - Yinyan Gao
- Department of Social Medicine and Health Administration, School of Public Health, Lanzhou University, Gansu, China
| | - Lili Jiang
- Department of Social Medicine and Health Administration, School of Public Health, Lanzhou University, Gansu, China
| | - Lin Yuan
- Department of Nutrition and Food Hygiene, School of Public Health, Lanzhou University, Gansu, China
| | - Pengju Wang
- Department of Social Medicine and Health Administration, School of Public Health, Lanzhou University, Gansu, China
| | - Yanwen Cao
- Department of Social Medicine and Health Administration, School of Public Health, Lanzhou University, Gansu, China
| | - Xuping Song
- Department of Social Medicine and Health Administration, School of Public Health, Lanzhou University, Gansu, China
| | - Long Ge
- Department of Social Medicine and Health Administration, School of Public Health, Lanzhou University, Gansu, China.,Evidence-Based Social Science Research Center, School of Public Health, Lanzhou University, Gansu, China
| | - Guowu Ding
- Department of Social Medicine and Health Administration, School of Public Health, Lanzhou University, Gansu, China
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Khosravipour M, Khanlari P, Khazaie S, Khosravipour H, Khazaie H. A systematic review and meta-analysis of the association between shift work and metabolic syndrome: The roles of sleep, gender, and type of shift work. Sleep Med Rev 2021; 57:101427. [PMID: 33556868 DOI: 10.1016/j.smrv.2021.101427] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 10/09/2020] [Accepted: 10/15/2020] [Indexed: 12/13/2022]
Abstract
This study was conducted to investigate the association between shift work and metabolic syndrome (MetS) and quantify the roles of sleep, gender, and type of shift work. We searched online databases, including PubMed, Scopus, and Web of Science on November 17, 2019. Of the 821 articles identified, 38 observational studies (27 cross-sectional, 10 cohorts, and one nested case-control), conducted on 128,416 participants, met our eligibility criteria. The pooled Odds ratio (OR) and 95% Confidence interval (CI) of MetS in shift-versus day-workers were estimated as 1.14 (1.07, 1.21) and 1.11 (1.06, 1.17) for the unadjusted and adjusted models. This association remained significant only for the studies with a cross-sectional design. There was a significantly higher odds of MetS in the studies conducted only on females (1.13 [1.06, 1.20]) or males (1.12 [1.02, 1.21]). The pooled adjusted OR (95% CI) for the studies without and with sleep adjustment was calculated as 1.14 (1.08, 1.21) and 1.29 (1.06, 1.52). We observed that rotating shift workers had stronger odds of MetS than the other shift workers. In conclusion, our findings revealed the significant odds of an association between shift work and MetS and different effects for sleep, gender, and type of shift work.
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Affiliation(s)
- Masoud Khosravipour
- Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran; Department of Occupational Health Engineering, School of Health, Kermanshah University of Medical Sciences, Kermanshah, Iran; Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Payam Khanlari
- Student Research Committee, Hamadan University of Medical Sciences, Hamadan, Iran; Department of Ergonomics, School of Health, Hamadan University of Medical Sciences, Hamadan, Iran.
| | - Sepideh Khazaie
- Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran; Sleep Disorders Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Hadis Khosravipour
- Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Habibolah Khazaie
- Sleep Disorders Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
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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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11
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Chang WP, Jen HJ. BMI differences between different genders working fixed day shifts and rotating shifts: a literature review and meta-analysis. Chronobiol Int 2020; 37:1754-1765. [PMID: 32873091 DOI: 10.1080/07420528.2020.1800027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The objective of this study was to perform a systematic literature review and meta-analysis to understand the BMI differences between different genders working fixed day shifts and rotating shifts. The Pubmed, Medline, and Embase databases were searched using set keywords, thereby producing 42 studies. Study quality was assessed using appraisal criteria from the Joanna Briggs Institute (JBI), and meta-analysis was performed using Comprehensive Meta-Analysis Software (CMA) version 3. The indices were the means and standard deviations of BMI values from different genders working fixed day shifts and rotating shifts. The participants of the studies included a total of 43,193 individuals working rotating shifts and 185,875 individuals working fixed day shifts. The pooling effect size (SMD, standardized mean difference) presented was 0.19. The 95% confidence interval ranged from 0.10 to 0.281. The meta-regression analysis results showed that women had higher BMI values than men, the difference was statistically significant (p <.001). The heterogeneity test indicated statistically significant differences (p <.05), and the percentage of heterogeneity (I square) was 97.91%, which indicates that a high degree of heterogeneity exists among studies. A subgroup analysis by gender was conducted. For women, the pooling effect size was 0.25, and the 95% confidence interval ranged from 0.20 to 0.30. For men, the pooling effect size was 0.19, and the 95% confidence interval ranged from 0.05 to 0.33. This meta-analysis found that both women and men working rotating shifts have significantly higher BMI values than those working fixed day shifts. Finally, we divided the data into a cross-sectional group and a cohort group based on study design, and a meta-regression analysis conducted after controlling for age and nature of work variables revealed that in the cohort study, women presented higher BMI values than men, and the difference was statistically significant (p =.010). Thus, in terms of long-term effects, these results indicate that working rotating shifts exerts a greater impact on the BMI of women.
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Affiliation(s)
- Wen-Pei Chang
- School of Nursing, College of Nursing, Taipei Medical University , Taipei, Taiwan.,Department of Nursing, Shuang Ho Hospital, Taipei Medical University , New Taipei City, Taiwan
| | - Hsiu-Ju Jen
- Department of Nursing, Shuang Ho Hospital, Taipei Medical University , New Taipei City, Taiwan
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Khosravipour M, Shahmohammadi M, Athar HV. The effects of rotating and extended night shift work on the prevalence of metabolic syndrome and its components. Diabetes Metab Syndr 2019; 13:3085-3089. [PMID: 31765983 DOI: 10.1016/j.dsx.2019.11.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 11/11/2019] [Indexed: 02/08/2023]
Abstract
BACKGROUND Some studies indicated night shift work can be associated with the higher risk of metabolic syndrome (MetS). However, the effect of both rotating and extended night shift work (12-hr rotating night) on MetS has not well-known. We aimed to examine and clarify the association among petrochemical workers. METHODS We recruited 1575 eligible workers in this study. According to shift work schedules the participants were divided into following groups: 12-hr fixed day and 12-hr rotating night. Biochemical data, including fasting blood sugar and lipid panel (TC, TG, LDL, and HDL) were determined by blood tests. Demographic data was obtained by interview at the time of blood pressure and anthropometric indices measurements. The National Cholesterol Education Program (NCEP) Adult Treatment Panel III (ATP III) was applied to identify subjects with MetS. The Logistic regression models were used to predict risk of MetS and its components between study groups. RESULTS The prevalence of MetS was showed 18.4% (290/1575). We found a significant difference between study groups in the prevalence of MetS (p < 0.05). The odds ratios (ORs) and 95% confidence intervals (CIs) in the 12-hr rotating night group in comparison to the 12-hr fixed day shift group according to unadjusted and full adjusted logistic regression models were estimated 1.26 (0.96, 1.65) and 1.34 (1.01, 1.76), respectively. Among MetS components, we observed the significant higher risk in TG and HDL (P < 0.05). CONCLUSION This study suggests 12-hr rotating night shift as the high-risk group for MetS. More studies needed to confirm our findings.
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Affiliation(s)
- Masoud Khosravipour
- Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran; Department of Occupational Health Engineering, School of Public Health, Kermanshah University of Medical Science, Kermanshah, Iran; Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Mostafa Shahmohammadi
- Department of Occupational Health Engineering, School of Public Health, Kermanshah University of Medical Science, Kermanshah, Iran; Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Hossein Valadi Athar
- Department of Occupational Health Engineering, School of Public Health, Kermanshah University of Medical Science, Kermanshah, Iran; Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran.
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13
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Hanprathet N, Lertmaharit S, Lohsoonthorn V, Rattananupong T, Ammaranond P, Jiamjarasrangsi W. Shift Work and Leukocyte Count Changes among Workers in Bangkok. Ann Work Expo Health 2019; 63:689-700. [PMID: 31211837 DOI: 10.1093/annweh/wxz039] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 03/13/2019] [Accepted: 05/03/2019] [Indexed: 01/24/2023] Open
Abstract
OBJECTIVES Previous epidemiological evidence for the association of shift work exposure and increased leukocyte count is cross-sectional in nature, thus limiting cause-effect inference. We therefore used a longitudinal design to: (i) compare leukocyte counts at baseline between shift and day workers and (ii) examine the time trend of leukocyte counts over the follow-up period for these workers. METHODS A retrospective cohort study was conducted among 6737 workers aged <60 years at two large organizations (a humanitarian organization and a university) in Bangkok, Thailand who had participated in at least two annual health check-ups during the period 2005-2016. Shift work exposure history was assessed by a self-administered questionnaire and categorized into day, former, and current shift workers. Data on leukocyte count were collected annually as part of worksite health screening during the observation period. Association of shift work exposure and increased leukocyte count was then examined cross-sectionally and longitudinally by using multiple linear regression and multilevel analysis of repeated measures data, respectively. In addition, trends for leukocyte count over the follow-up period and work years were examined using LOWESS smooth curves. RESULTS Compared to day work, the current shift work was associated with increased leukocyte counts. The magnitude of percentage increase was the highest for basophil counts, followed by eosinophil and lymphocyte counts. Both cross-sectional and longitudinal evidence revealed this association, although it was less pronounced longitudinally. For total leukocyte count, the magnitude of difference was constant across the 11-year follow-up period. However, for lymphocyte and basophil counts, these discrepancies tapered over the work years until they no longer differed (for lymphocyte count) or even differed in the opposite direction (for basophil count) in later work years. CONCLUSION This study confirmed previous cross-sectional evidence that shift work exposure-increased leukocyte counts and that this was reversible. Whether this increase in immune cell count also results in an increased immune cell activity and serves as the intermediary in the association between shift work exposure and subsequent chronic disease development needs further investigation.
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Affiliation(s)
- Nitt Hanprathet
- Department of Preventive and Social Medicine, Faculty of Medicine, Chulalongkorn University, Pathumwan, Bangkok, Thailand
| | - Somrat Lertmaharit
- Department of Preventive and Social Medicine, Faculty of Medicine, Chulalongkorn University, Pathumwan, Bangkok, Thailand
| | - Vitool Lohsoonthorn
- Department of Preventive and Social Medicine, Faculty of Medicine, Chulalongkorn University, Pathumwan, Bangkok, Thailand.,Department of Preventive and Social Medicine, King Chulalongkorn Memorial Hospital, Thai Red Cross, Bangkok, Thailand
| | - Thanapoom Rattananupong
- Department of Preventive and Social Medicine, Faculty of Medicine, Chulalongkorn University, Pathumwan, Bangkok, Thailand
| | - Palanee Ammaranond
- Department of Transfusion Medicine, Faculty of Allied Health Sciences, Chulalongkorn University, Pathumwan, Bangkok, Thailand
| | - Wiroj Jiamjarasrangsi
- Department of Preventive and Social Medicine, Faculty of Medicine, Chulalongkorn University, Pathumwan, Bangkok, Thailand.,Department of Preventive and Social Medicine, King Chulalongkorn Memorial Hospital, Thai Red Cross, Bangkok, Thailand
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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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15
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Tanaka R, Tsuji M, Kusuhara K, Kawamoto T. Association between time-related work factors and dietary behaviors: results from the Japan Environment and Children's Study (JECS). Environ Health Prev Med 2018; 23:62. [PMID: 30547743 PMCID: PMC6293619 DOI: 10.1186/s12199-018-0753-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 11/29/2018] [Indexed: 11/10/2022] Open
Abstract
Background Few studies have examined the association of workhours and shift work (referred to here as “time-related work factors”) with dietary behaviors. We aimed to investigate this association, as well as the dietary behaviors among individuals with occupations characterized by time-related work factors. Methods A cross-sectional study was performed using data from the Japan Environment and Children’s Study. The study included 39,315 working men. Dietary behaviors (i.e., skipping breakfast, eating out, eating instant food, overeating, and eating fast) were assessed with a self-reported information from the Food Frequency Questionnaire. Logistic regression analysis was conducted to examine the associations of time-related work factors with dietary behaviors and dietary behavior tendencies among those in occupations characterized by long workhours and/or shift work. Results Long workhours were associated with high frequencies of skipping breakfast, eating out, eating instant food, overeating, and eating fast. The frequency of having shift work was associated with high frequencies of skipping breakfast, eating out, and eating instant food. Several occupations involving long workhours and/or shift work showed specific dietary behaviors; in some occupations, the level of significance changed after adjusting for time-related work factors in addition to other potential confounding factors. Conclusions Time-related work factors may help explain workers’ dietary behaviors. Long workhours and shift work may lead to poor dietary behaviors. Other factors influenced by occupation itself, such as food environment, may also influence workers’ dietary behaviors. Workhours and/or shift work, and these other work factors, should be given attention in workplace health promotion.
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Affiliation(s)
- Rie Tanaka
- Department of Environmental Health, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, Fukuoka, 807-8555, Japan
| | - Mayumi Tsuji
- Department of Environmental Health, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, Fukuoka, 807-8555, Japan.
| | - Koichi Kusuhara
- Japan Environment and Children's Study, UOEH Subunit Center, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, Fukuoka, 807-8555, Japan.,Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, Fukuoka, 807-8555, Japan
| | - Toshihiro Kawamoto
- Department of Environmental Health, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, Fukuoka, 807-8555, Japan
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Nakamura M, Miura A, Nagahata T, Toki A, Shibata Y, Okada E, Ojima T. Dietary intake and dinner timing among shift workers in Japan. J Occup Health 2018; 60:467-474. [PMID: 30175718 PMCID: PMC6281632 DOI: 10.1539/joh.2018-0070-oa] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Objectives: Shift workers are at an increased risk of diet-related chronic conditions. We aimed to investigate dietary intake and dinner timing among shift workers. Methods: A questionnaire survey was administered to the employees of 43 companies in Japan between December 2013 and February 2014. The dietary intake of workers was assessed through a validated food frequency questionnaire (FFQ). Nutrient intake was evaluated by adjusting the total energy intake using a nutrient residual model. Analysis of covariance was used to obtain the means of total energy and nutrient intake by the work schedule (shift or daytime), and the means of total energy and nutrient intake by dinner timing (regular or irregular). Results: Valid responses were obtained from 2,062 daytime and 302 shift workers. A valid response rate to the FFQ was slightly but significantly lower among shift workers than among daytime workers (87.1% and 91.8 %). When compared to daytime workers, shift workers were more likely to eat dinner at irregular times (46.7% vs. 3.6%). Shift work was associated with a higher mean body mass index (23.4 kg/m2 vs. 22.3 kg/m2), a higher proportion of being overweight (27.7% and 18.8%), higher total energy intake, and lower intakes of dietary fiber, vitamin B2, folic acid, vitamin C, potassium, calcium, magnesium and iron. Moreover, irregular dinner timing was associated with lower intakes of protein, folic acid, and zinc in daytime workers, and lower intakes of carbohydrate and copper in shift workers. Conclusions: These findings indicate a need to improve the diet of shift workers.
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Affiliation(s)
- Mieko Nakamura
- Department of Community Health and Preventive Medicine, Hamamatsu University School of Medicine
| | - Ayako Miura
- Department of Health and Nutrition, Faculty of Health Proportional Sciences, Tokoha University
| | - Tomomi Nagahata
- Department of Nutrition, Faculty of Health and Nutrition, Tokaigakuen University
| | - Atsushi Toki
- Department of Community Health and Preventive Medicine, Hamamatsu University School of Medicine
| | - Yosuke Shibata
- Department of Community Health and Preventive Medicine, Hamamatsu University School of Medicine
| | - Eisaku Okada
- Department of Community Health and Preventive Medicine, Hamamatsu University School of Medicine
| | - Toshiyuki Ojima
- Department of Community Health and Preventive Medicine, Hamamatsu University School of Medicine
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Jia X, Chen Q, Wu P, Liu M, Chen X, Xiao J, Chen L, Zhang P, Wang S. Dynamic development of metabolic syndrome and its risk prediction in Chinese population: a longitudinal study using Markov model. Diabetol Metab Syndr 2018; 10:24. [PMID: 29619091 PMCID: PMC5880005 DOI: 10.1186/s13098-018-0328-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 03/21/2018] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND With the increasing prevalence of metabolic syndrome (MS), there is a need to track and predict the development of MS. In this study, we established a Markov model to explore the natural history and predict the risk of MS. METHODS A total of 21,777 Chinese individuals who had at least two consecutive health check-ups between 2010 and 2015 were studied. MS was defined using the Chinese Diabetes Society criteria. Twelve metabolic abnormal states (the no component state, four isolated component states, six 2-component states, and the MS state) were contained in each Markov chain. The transition probability was the mean of five probabilities for the transition between any two states in 2 consecutive years. RESULTS The dyslipidemia or overweight/obesity components were most likely to initiate the progress of MS in individuals aged 18-49. However, for individuals over 50 years old, the most likely initiating component of MS was dyslipidemia or hypertension. People who initially had dyslipidemia were most likely to develop the combined state of dyslipidemia with overweight/obesity before the age of 50, but after 50 years of age, the state of dyslipidemia merged with hypertension was the most common. Subjects (with the exception of males over 50 years of age who initially had an isolated state of hyperglycemia) who initially had an isolated state of overweight/obesity, hypertension, or hyperglycemia were most likely to develop a combination of one of these initial states with dyslipidemia. Males who initially had isolated hyperglycemia tended to develop hypertension after age 50. There was a greater chance for subjects who initially had an isolated hyperglycemia state or 2-component state that contained hyperglycemia to develop MS within 10 years compared to those who initially had other abnormal metabolic states. CONCLUSIONS The occurrence of MS primarily began with overweight/obesity or dyslipidemia in people aged 18-49. However, for those over 50 years old, MS primarily initiated under the conditions of dyslipidemia or hypertension. When MS started under the conditions of overweight/obesity, hypertension or hyperglycemia, dyslipidemia tended to occur next. People who initially had isolated hyperglycemia or a 2-component state that contained hyperglycemia had a higher risk of developing MS than those with other initiating states.
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Affiliation(s)
- Xiaoxian Jia
- Department of Epidemiology, School of Public Health, Shandong University, 44 Wenhua West Road, Jinan, 250012 China
| | - Qicai Chen
- Department of Prevention and Health Care, Dongying Shengli Oilfield Central Hospital, Dongying, 257000 China
| | - Peipei Wu
- Department of Commodity Price and Medical Insurance, Shenzhen People’s Hospital, Shenzhen, 518020 China
| | - Meng Liu
- Department of Hospital Infection Management, Qilu Hospital of Shandong University, Jinan, 250012 China
| | - Xiaoxiao Chen
- Department of Medical Records and Statistics, Zhejiang Hospital, Hangzhou, 310013 China
| | - Juan Xiao
- Center of Evidence-based Medicine, The Second Hospital of Shandong University, Jinan, 250033 China
| | - Lili Chen
- Department of Nutrition and Food Safety, Zhejiang Center for Disease Control and Prevention, Hangzhou, 310051 China
| | - Pengpeng Zhang
- Tianjin Entry-Exit Inspection and Quarantine Bureau, Tianjin, 300000 China
| | - Shumei Wang
- Department of Epidemiology, School of Public Health, Shandong University, 44 Wenhua West Road, Jinan, 250012 China
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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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