Bimodal chronotype in night-shift workers

2019 ◽  
pp. 59-63
Author(s):  
Svetlana G. Gorokhova ◽  
Oleg Yu. Atkov ◽  
Vasiliy V. Serikov ◽  
Elena V. Muraseeva ◽  
Viktor F. Pfaf
Keyword(s):  
Time Management ◽  
Occupational Medicine ◽  
Night Shift ◽  
Work Conditions ◽  
Working Time ◽  
Health Programs ◽  
Shift Workers ◽  
Associated Diseases ◽  
Rational Management ◽  
Health Disorders

Introduction. Typology of diurnal (circadian) human rhythms is actively studied in occupational medicine, from the viewpoint of adaptation to various work conditions including those with shift working schedule. In recent years, evidences outline bimodal chronotype characterized by simultaneously present signs of extreme morning and extreme evening types without dominating one of them. Studies did not cover bimodal chronotype in night-shift workers.Objective is to evaluate presence of bimodal chronotype in night-shift workers if compared to day-shift schedule.Materials and methods. Chronotype outlining covered 95 workers divided into 2 groups: first — 55 night-shift workers, second — 40 workers on day schedule. Bimodal chronotype was diagnosed via algorithm based on questionnaire Morningness Eveningness Questionnaire (MEQ) by B.J. Martynhak et al.Results. Findings are that 7.3% of night-shift workers and 5.0% of workers with day schedule demonstrate bimodal chronotype. Changed chronotype classification leads to smaller share of workers with intermediate chronotype, but quota of morning and evening chronotypes does not change. Possibility of bimodal chronotype should be respected in examination of workers for designing health programs with consideration of chronotype-associated diseases and for better performance due to rational management of working time.Conclusions. Diagnosis of individual chronotype is a serious part in health programs formation in able-bodied population. Chronotype knowledge helps to minimize possible decrease and losses of performance due to rational working time management and preventive programs aimed to diagnose chronotype-associated health disorders.

scholarly journals PENGARUH BEKERJA DENGAN SHIFT TERHADAP FAKTOR FISIOLOGIS PEKERJA PABRIK TRIPLEK PT. ADMIRA DI DESA BIBIS KECAMATAN SUKOMORO KABUPATEN MAGETAN TAHUN 2015

2015 ◽  
Vol 13 (3) ◽  
Author(s):  
Novyta Anggraeni .S ◽  
Trimawan Heru Wijono ◽  
Handoyo .
Keyword(s):  
Sleep Disorders ◽  
Shift Work ◽  
Night Shift ◽  
Working Time ◽  
Gastrointestinal Disorders ◽  
Factory Workers ◽  
Physiological Disorder ◽  
Physiological Factors ◽  
Shift Workers ◽  
Rural Districts

Shift work affects the occurrence of physiological factors on workers especially night shift workers. Changes in working time from daylight to night resulted in physiological disorders.Workers can not be changed or workers circadian rhythms that are not able to adjust to changes in working time cause physiological disorders. Therefore, research on the effect of shift work on physiological factors plywood factory workers of PT. Admira rural districts Sukomoro Magetan 2015 Magetan district.This research is a descriptive study with the stratified random sampling design of 19 respondents.Based on the results of the study, 94.74% of respondents experienced a physiological disorder. Respondents who experienced a physiological disorder with symptoms of fatigue 75.93%.Male respondents who experience fatigue disorder 47.21%, 47.21% of sleep disorders, and gastrointestinal disorders 55.56%. Female respondents who experience fatigue disorder 38.89%, 27.78% of sleep disorders, and gastrointestinal disorders 27.78%. This indicates that respondents who experienced a physiological disorder that respondents can not be changed circadian rhythm,or the respondents were not able to adjust to the time change from daylight to night work. For that we need additional hour of rest and given special facilities to rest for the nightshift workers. It should also be noted the division of working time, rest periods, and the worker'sage, especially night shift workers to minimize the physiological effects of workers.

scholarly journals Night shift work and the risk of metabolic syndrome: Findings from an 8-year hospital cohort

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0261349
Author(s):  
Wan-Ju Cheng ◽  
Chiu-Shong Liu ◽  
Kai-Chieh Hu ◽  
Yu-Fang Cheng ◽  
Kati Karhula ◽  
...  
Keyword(s):  
Metabolic Syndrome ◽  
Shift Work ◽  
Night Shift ◽  
Working Time ◽  
Health Examination ◽  
Long Term Effects ◽  
Time Data ◽  
Shift Workers ◽  
Night Shift Work ◽  
Night Shifts

Objectives Studies concerning the risk of metabolic syndrome associated with night work have shown inconsistent findings, due to imprecise working time data and cross-sectional design. We used register-based daily working time data to examine the risk of incident metabolic syndrome associated with night shift work. Methods Working time data collected between 2010 and 2018 of 5775 Taiwanese hospital workers were used to identify night shift workers and to calculate the number of night shifts. Metabolic syndrome was identified by annual occupational health examination results, which were linked to the working time data. Logistic regression models and generalized estimating equations were used to examine the association between night shift work and metabolic syndrome and the 5 components of metabolic syndrome. Results Night shift work is associated with a higher risk of developing metabolic syndrome (adjusted OR = 1.36, 95% CI = 1.04 to 1.78) and high waist circumference (adjusted OR = 1.27, 95% CI = 1.07 to 1.78) compared to day work. Among night shift workers, increased number of night shifts was associated with high blood pressure (adjusted OR = 1.15, 95% CI = 1.01 to 1.31). Conclusions Night shift work is associated with metabolic risk factors. Long-term effects of circadian rhythm disruption on metabolic disturbances needs to be further studied.

scholarly journals Alterations in Rev-ERBα/BMAL1 ratio and glycated hemoglobin in rotating shift workers: the EuRhythDia study

2021 ◽  
Author(s):  
Stefano Rizza ◽  
Alessio Luzi ◽  
Maria Mavilio ◽  
Marta Ballanti ◽  
Arianna Massimi ◽  
...  
Keyword(s):  
Mononuclear Cells ◽  
Glycated Hemoglobin ◽  
Night Shift ◽  
Multivariate Regression Analysis ◽  
Peripheral Blood Mononuclear ◽  
Cross Sectional ◽  
Shift Workers ◽  
Metabolic Defects ◽  
Clock Gene Expression ◽  
Cell Counts

Abstract Objective To detect premature gluco-metabolic defects among night shift workers with disturbances in circadian rhythms. Design and methods We performed a hypothesis-generating, cross-sectional analysis of anthropometric, metabolic, lipid, and inflammation parameters, comparing active (a-NSW, n = 111) and former (f-NSW, n = 98) rotating night shift workers with diurnal workers (controls, n = 69). All participants were hospital nurses. We also evaluated the Pittsburgh Sleep Quality Index (PSQI) and assessed expression of transcription factors REV-ERBα and BMAL1 in peripheral blood mononuclear cells (PBMCs), as indicators of the molecular clock. Results Both a-NSW and f-NSW participants had significantly higher glycated hemoglobin (HbA1c) and white blood cell counts (WBC) (p < 0.001 for both), PSQI global score (p = 0.001) and diastolic blood pressure levels (p = 0.024) compared with controls. Expression of REV-ERBα/BMAL1 RNA in PBMC was significantly higher in a-NSW (p = 0.05) than in f-NSW or control participants. Multivariate regression analysis showed that working status and PSQI were independent determinants of higher HbA1c levels (p < 0.001). Conclusions We demonstrated that young, healthy night shift workers show subclinical abnormalities in HbA1c and changes in peripheral clock gene expression.

scholarly journals Effects of work organization on the occurrence and resolution of sleep disturbances among night shift workers: a longitudinal observational study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Seungho Lee ◽  
Jae Bum Park ◽  
Kyung-Jong Lee ◽  
Seunghon Ham ◽  
Inchul Jeong
Keyword(s):  
Work Experience ◽  
Sleep Disturbances ◽  
Sleep Problems ◽  
Night Shift ◽  
Work Organization ◽  
Severity Index ◽  
Estimating Equation ◽  
Health Examination ◽  
Related Factors ◽  
Shift Workers

AbstractThis study aimed to investigate the association between work organization and the trajectories of insomnia patterns among night shift workers in a hospital. The health examination data of hospital workers, recorded from January 2014 to December 2018, were collected; 6765 records of 2615 night shift workers were included. Insomnia was defined as a score of ≥ 15 on the Insomnia Severity Index (ISI). Participants were categorized into five groups according to insomnia patterns derived from the analysis of their ISI scores. Work organization and socio-demographic characteristics were also investigated. Generalized estimating equation models and linear mixed models were constructed to analyze the longitudinal data. Of the total participants, 53.0% reported insomnia at least once during the follow-up period. The lack of nap opportunities and work-time control was associated with the occurrence of insomnia, whereas more than 5 years of shift work experience was related to the resolution of insomnia. All work-related factors were significantly related to insomnia risk; however, the effects were not significant in the sustained insomnia group. Although sleep problems are inevitable in night shift workers, well-designed work schedules and better work organization can help reduce the occurrence of insomnia among them.

scholarly journals Chronotype-specific Sleep in Two Versus Four Consecutive Shifts

2021 ◽  
pp. 074873042110060
Author(s):  
Dorothee Fischer ◽  
Till Roenneberg ◽  
Céline Vetter
Keyword(s):  
Night Shift ◽  
Sleep Diary ◽  
Sequence Length ◽  
Consecutive Night ◽  
Shift Workers ◽  
Subject Field ◽  
Sleep Diaries ◽  
Social Jetlag ◽  
Sleep Debt ◽  
Night Shifts

The study aimed to explore chronotype-specific effects of two versus four consecutive morning or night shifts on sleep-wake behavior. Sleep debt and social jetlag (a behavioral proxy of circadian misalignment) were estimated from sleep diary data collected for 5 weeks in a within-subject field study of 30 rotating night shift workers (29.9 ± 7.3 years, 60% female). Mixed models were used to examine whether effects of shift sequence length on sleep are dependent on chronotype, testing the interaction between sequence length (two vs. four) and chronotype (determined from sleep diaries). Analyses of two versus four morning shifts showed no significant interaction effects with chronotype. In contrast, increasing the number of night shifts from two to four increased sleep debt in early chronotypes, but decreased sleep debt in late types, with no change in intermediate ones. In early types, the higher sleep debt was due to accumulated sleep loss over four night shifts. In late types, sleep duration did not increase over the course of four night shifts, so that adaptation is unlikely to explain the observed lower sleep debt. Late types instead had increased sleep debt after two night shifts, which was carried over from two preceding morning shifts in this schedule. Including naps did not change the findings. Social jetlag was unaffected by the number of consecutive night shifts. Our results suggest that consecutive night shifts should be limited in early types. For other chronotypes, working four night shifts might be a beneficial alternative to working two morning and two night shifts. Studies should record shift sequences in rotating schedules.

Light therapy improves diurnal blood pressure control in night shift workers via reduction of catecholamines

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Juliane Hannemann ◽  
Anika Laing ◽  
Benita Middleton ◽  
Jonathan Cridland ◽  
Bart Staels ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Pressure Control ◽  
Night Shift ◽  
Light Therapy ◽  
Pressure Control ◽  
Shift Workers

scholarly journals Excessive mechanical strain accelerates intervertebral disc degeneration by disrupting intrinsic circadian rhythm

2021 ◽  
Author(s):  
Sheng-Long Ding ◽  
Tai-Wei Zhang ◽  
Qi-Chen Zhang ◽  
Wang Ding ◽  
Ze-Fang Li ◽  
...  
Keyword(s):  
Circadian Rhythm ◽  
Intervertebral Disc ◽  
Mechanical Loading ◽  
Disc Degeneration ◽  
Intervertebral Disc Degeneration ◽  
Night Shift ◽  
Mechanical Strain ◽  
Inhibitory Effect ◽  
Shift Workers ◽  
Normal Environment

AbstractNight shift workers with disordered rhythmic mechanical loading are more prone to intervertebral disc degeneration (IDD). Our results showed that circadian rhythm (CR) was dampened in degenerated and aged NP cells. Long-term environmental CR disruption promoted IDD in rats. Excessive mechanical strain disrupted the CR and inhibited the expression of core clock proteins. The inhibitory effect of mechanical loading on the expression of extracellular matrix genes could be reversed by BMAL1 overexpression in NP cells. The Rho/ROCK pathway was demonstrated to mediate the effect of mechanical stimulation on CR. Prolonged mechanical loading for 12 months affected intrinsic CR genes and induced IDD in a model of upright posture in a normal environment. Unexpectedly, mechanical loading further accelerated the IDD in an Light-Dark (LD) cycle-disrupted environment. These results indicated that intrinsic CR disruption might be a mechanism involved in overloading-induced IDD and a potential drug target for night shift workers.

scholarly journals Disturbances of Autonomic Regulation of Cardiovascular System at Different Working Regimes with Night Shifts

Kardiologiia ◽  
2020 ◽  
Vol 60 (9) ◽  
pp. 62-67
Author(s):  
Yu. A. Merkulov ◽  
A. A. Pyatkov ◽  
S. G. Gorokhova ◽  
D. M. Merkulova ◽  
O. Yu. Atkov
Keyword(s):  
Shift Work ◽  
Spectral Characteristics ◽  
Night Shift ◽  
Autonomic Regulation ◽  
Total Power ◽  
Orthostatic Test ◽  
Heart Rhythm Variability ◽  
Shift Workers ◽  
Rotating Shift Work ◽  
Night Shifts

Aim        To study temporal and spectral characteristics of heart rhythm variability (HRV) in night shift workers.Materials and methods       Along with traditional risk factors, conditions of labor contribute to development of cardiovascular morbidity, including night shift work, which can be associated with disorders of the autonomic regulation detected by analysis of HRV. This study included 100 healthy men. 74 of them were engaged in shift work, including 53 men with rotating shift work, 21 men with fixed night shifts, and 26 men with day-time work. HRV was analyzed by data of 5-min electrocardiogram recording (background recording and orthostatic test).Results   Night-shift workers had decreases in total power of regulation (ТР, SDNN) and in the parasympathetic branch (HF, pNN50). Rotating night-shift workers displayed significant decreases in SDNN and pNN50 and pronounced changes in the VLF / LF / HF ratio in the orthostatic test.Conclusion            In work with night shifts, the type of autonomic regulation differs from the “standard” functioning of the autonomic nervous system (ANS). This study showed different effects of night work regimens on HRV indexes. With the rotating shift work, the ANS dysregulation was more profound and was evident by a significant decrease in the ANS total tone and parasympathetic activity (SDNN, pNN50) compared to night shifts with fixed working hours. The excessive weakening of the parasympathetic component in the passive orthostatic test can be considered as an early marker for ANS maladaptation. 

scholarly journals Dark matters: effects of light at night on metabolism

2018 ◽  
Vol 77 (3) ◽  
pp. 223-229 ◽  
Author(s):  
Randy J. Nelson ◽  
Souhad Chbeir
Keyword(s):  
Circadian Rhythms ◽  
Animal Studies ◽  
Human Subjects ◽  
Night Shift ◽  
Past Century ◽  
Light At Night ◽  
Shift Workers ◽  
The Past ◽  
Time Of Year ◽  
Life On Earth

Life on earth has evolved during the past several billion years under relatively bright days and dark night conditions. The wide-spread adoption of electric lights during the past century exposed animals, both human and non-human, to significant light at night for the first time in their evolutionary history. Endogenous circadian clocks depend on light to entrain to the external daily environment and seasonal rhythms depend on clear nightly melatonin signals to assess time of year. Thus, light at night can derange temporal adaptations. Indeed, disruption of naturally evolved light–dark cycles results in several physiological and behavioural changes with potentially serious implications for physiology, behaviour and mood. In this review, data from night-shift workers on their elevated risk for metabolic disorders, as well as data from animal studies will be discussed. Night-shift workers are predisposed to obesity and dysregulated metabolism that may result from disrupted circadian rhythms. Although studies in human subjects are correlative, animal studies have revealed several mechanisms through which light at night may exert its effects on metabolism by disrupting circadian rhythms that are associated with inflammation, both in the brain and in the periphery. Disruption of the typical timing of food intake is a key effect of light at night and subsequent metabolic dysregulation. Strategies to avoid the effects of light at night on body mass dysregulation should be pursued.

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