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Maya Balakrishnan, Hashem B El-Serag, Fasiha Kanwal, Aaron P Thrift
AIMS: There is increased focus on the metabolic impact of shiftwork, especially given the significant number of employees who work nighttime or rotating shifts. Nonalcoholic fatty liver disease (NAFLD) is the hepatic manifestation of the metabolic syndrome. We conducted a cross-sectional study to examine the association between shiftwork and the risk of NAFLD. METHODS: We used aggregated data from the 2005-2006, 2007-2008, and 2009-2010 cycles of the National Health and Nutrition Examination Survey (NHANES)...
December 19, 2016: Digestive Diseases and Sciences
Audrey J R Lim, Zhongwei Huang, Seok Eng Chua, Michael S Kramer, Eu-Leong Yong
CONTEXT: Few studies have examined the associations between sleep duration, shiftwork, and exercise to the infrequent menstruation, hyperandrogenism, and ovarian morphological changes observed in women with polycystic ovarian syndrome (PCOS). OBJECTIVE: To examine whether lifestyle factors, including short sleep duration, insufficient exercise, and shiftwork, alone or in combination, are associated with the reproductive and metabolic abnormalities typical of PCOS in a healthy population...
2016: PloS One
Pamela Barbadoro, Elisa Ponzio, Carlos Juan Chiatti, Francesco Di Stanislao, Marcello Mario D'Errico, Emilia Prospero
OBJECTIVES: To investigate the prevalence of obesity among different types of employment status in the Italian working population, and to examine associated risk factors. MATERIAL AND METHODS: Cross-sectional survey of 36 814 people that declared to have been occupied with the same type of contract for at least 5 years was analyzed. Multivariable logistic regression models were built considering workers' sex, age, education, family body mass index (BMI) category, leisure time and occupational physical activity, weight control habits, smoking habit, use of drugs, number of working hours per week, and type of working contract...
November 18, 2016: International Journal of Occupational Medicine and Environmental Health
Charlotte C Gupta, Jill Dorrian, Crystal L Grant, Maja Pajcin, Alison M Coates, David J Kennaway, Gary A Wittert, Leonie K Heilbronn, Chris B Della Vedova, Siobhan Banks
Shiftworkers have impaired performance when driving at night and they also alter their eating patterns during nightshifts. However, it is unknown whether driving at night is influenced by the timing of eating. This study aims to explore the effects of timing of eating on simulated driving performance across four simulated nightshifts. Healthy, non-shiftworking males aged 18-35 years (n = 10) were allocated to either an eating at night (n = 5) or no eating at night (n = 5) condition. During the simulated nightshifts at 1730, 2030 and 0300 h, participants performed a 40-min driving simulation, 3-min Psychomotor Vigilance Task (PVT-B), and recorded their ratings of sleepiness on a subjective scale...
October 13, 2016: Chronobiology International
Teresa Cotrim, José Carvalhais, Catarina Neto, Júlia Teles, Paulo Noriega, Francisco Rebelo
In the last two decades the control of the Portuguese railway network has become much more centralized in three centres, there integrating the functions of route flow management, electrical control and signalling. This study aimed to investigate the influence of work and individual determinants in sleepiness among railway control workers, namely socio-demographic factors, work ability, psychosocial factors, shiftwork characteristics, fatigue perception, and sleep. Sleepiness by shift was associated with quality of sleep, job satisfaction, fatigue perception, quantitative demands, and age...
January 2017: Applied Ergonomics
Glenn Legault, Alexandra Clement, Glen P Kenny, Stephen Hardcastle, Nancy Keller
Sleep deprivation, abnormal sleep patterns arising from working rotating shifts, and exposure to high ambient temperatures contribute to physical and cognitive dysfunction. We examined the effects of these on 19 (41.5 ± 5.1 years) male underground miners. Data were collected for 28 to 30 consecutive days such that the participants experienced their full rotating shift schedule, including days off. Objective measures of sleep quality (actigraphy), attentional capacity (psychomotor vigilance task), core body temperature (visceral pill), executive function (BRIEF-A) and subjective measures of fatigue (Karolinska and Epworth Sleepiness scales) were obtained over the 28-30 day period...
January 2017: Applied Ergonomics
Lee C Yong, Jia Li, Geoffrey M Calvert
OBJECTIVE: To estimate the prevalence of a comprehensive set of self-reported sleep problems by job characteristics, including shiftwork status, among a representative sample of US workers. METHODS: Data for 6338 workers aged ≥18 years were obtained from the National Health and Nutrition Examination Survey. Short sleep duration was defined as <7 hours per weekday/workday. Sleep quality was categorised as good, moderate and poor based on the frequency of 6 sleep-related symptoms...
September 8, 2016: Occupational and Environmental Medicine
Youil Shon, Seungho Ryu, Byung-Seong Suh, Soo-Geun Kim, Won-Sool Kim, Hee-Seung Son, Hee-Yun Kim, Han-Seur Jeong
BACKGROUND: Previous studies have reported the effects of direction of shift rotation on sleep, however, the findings are inconsistent. In this study, we investigated sleep quality related to direction of shift rotation using large-scale data from shiftwork-specific health examinations of electronics workers. METHODS: This study included 4750 electronics workers working in a rotating 3-shift system who completed a medical examination for shift workers survey from January 1 to December 31, 2014, at a general hospital...
2016: Annals of Occupational and Environmental Medicine
Koh Mizuno, Akiko Matsumoto, Tatsuya Aiba, Takashi Abe, Hiroshi Ohshima, Masaya Takahashi, Yuichi Inoue
BACKGROUND: Flight controllers of the International Space Station (ISS) are engaged in shift work to provide 24-h coverage to support ISS systems. The purpose of this study was to investigate the prevalence and associated factors of shift work sleep disorder (SWSD) among Japanese ISS flight controllers. METHODS: A questionnaire study was conducted using the Standard Shiftwork Index to evaluate sleep-related problems and possible associated variables. Among 52 respondents out of 73 flight controllers, 30 subjects were identified as night shift workers who worked 3 or more night shifts per month...
September 1, 2016: Journal of Physiological Anthropology
Charli Sargent, Paul Roberts, Drew Dawson, Sally Ferguson, Lynn Meuleners, Libby Brook, Gregory D Roach
The 9th International Conference on Managing Fatigue in Transportation, Resources and Health was held in Fremantle, Western Australia in March 2015. The purpose of the conferences in this series is to provide a forum for industry representatives, regulators, and scientists to discuss recent advances in the field of fatigue research. We have produced a Special Issue of the International Journal of Environmental Research and Public Health based on papers from the conference that were focused on various aspects of public health...
2016: International Journal of Environmental Research and Public Health
Anne-Loes Opperhuizen, Dawei Wang, Ewout Foppen, Remi Jansen, Olga Boudzovitch-Surovtseva, Janneke de Vries, Eric Fliers, Andries Kalsbeek
Shiftworkers run an increased risk of developing metabolic disorders, presumably as a result of disturbed circadian physiology. Eating at a time-of-day that is normally dedicated to resting and fasting, may contribute to this association. The hypothalamus is the key brain area that integrates different inputs, including environmental time information from the central biological clock in the suprachiasmatic nuclei, with peripheral information on energy status to maintain energy homeostasis. The orexin system within the lateral hypothalamus is an important output of the suprachiasmatic nuclei involved in the control of sleep/wake behavior and glucose homeostasis, among other functions...
November 2016: European Journal of Neuroscience
Hitoshi Okamura, Masao Doi, Kaoru Goto, Rika Kojima
With the current societal norm of shiftwork and long working hours, maintaining a stable daily life is becoming very difficult. An irregular lifestyle disrupts circadian rhythms, resulting in the malfunction of body physiology and ultimately leading to lifestyle-related diseases, including hypertension. By analyzing completely arrhythmic Cry1/Cry2 double-knockout (Cry-null) mice, we found salt-sensitive hypertension accompanied by hyperaldosteronism. On the basis of a DNA microarray analysis of the adrenal gland and subsequent biochemical analyses, we discovered that Hsd3b6/HSD3B1, a subtype of 3β-HSD, is markedly overexpressed in aldosterone-producing cells in the Cry-null adrenal cortex...
October 2016: Hypertension Research: Official Journal of the Japanese Society of Hypertension
Svetlana Postnova, Steven W Lockley, Peter A Robinson
An improvement to our current quantitative model of arousal state dynamics is presented that more accurately predicts sleep propensity as measured with sleep dynamics depending on circadian phase and prior wakefulness. A nonlinear relationship between the circadian variables within the dynamic circadian oscillator model is introduced to account for the skewed shape of the circadian rhythm of alertness that peaks just prior to the onset of the biological night (the "wake maintenance zone") and has a minimum toward the end of the biological night...
October 2016: Journal of Biological Rhythms
Silvio Araújo Fernandes-Junior, Francieli Silva Ruiz, Leandro Stetner Antonietti, Sergio Tufik, Marco Túlio de Mello
INTRODUCTION: The reversal of the natural cycle of wakefulness and sleep may cause damage to the health of workers. However, there are few studies evaluating sleep, fatigue and quality of life of night shift workers considering the influence of small children on these variables. AIMS: Evaluate the sleep time, fatigue and quality of life of night shift workers and verify the relationship between these variables with the presence or absence of children in different age groups...
2016: PloS One
Kimberly A Honn, Anne Helene Garde, Frida Marina Fischer, Hans P A Van Dongen
No abstract text is available yet for this article.
2016: Chronobiology International
June J Pilcher, Kristen S Jennings, Ginger E Phillips, James A McCubbin
OBJECTIVE: The current study investigated performance on a dual auditory task during a simulated night shift. BACKGROUND: Night shifts and sleep deprivation negatively affect performance on vigilance-based tasks, but less is known about the effects on complex tasks. Because language processing is necessary for successful work performance, it is important to understand how it is affected by night work and sleep deprivation. METHOD: Sixty-two participants completed a simulated night shift resulting in 28 hr of total sleep deprivation...
June 15, 2016: Human Factors
Luenda E Charles, Songzhu Zhao, Desta Fekedulegn, John M Violanti, Michael E Andrew, Cecil M Burchfiel
BACKGROUND: Our objective was to assess the influence of shiftwork on change in endothelial function. METHODS: This longitudinal study was conducted in 188 police officers (78.2% men). Shiftwork status (day, afternoon, night) was assessed objectively using daily Buffalo, NY payroll work history records. Brachial artery flow-mediated dilation (FMD) was assessed using ultrasound. Mean change in FMD% between 2004-2009 and 2010-2015 was compared across shiftwork using analysis of variance/covariance...
November 2016: American Journal of Industrial Medicine
John Rodwell, Julian Fernando
PURPOSE: Despite the prevalence of shiftwork, the mechanisms underlying its effects on nurses' well-being and adaptation to the shifts are not fully understood. This study examines whether the characteristics of the person, particularly chronotype, and aspects of the situation (i.e., shift schedule and the nature of work on each shift for each work context) affect job-specific and general well-being above and beyond potential confounds such as age and negative affectivity (NA). DESIGN: Primarily surveys of Australian nurses (N = 446) in three contexts (general acute hospital, maternity hospital, aged care)...
July 2016: Journal of Nursing Scholarship
Jaqueline Girnos Sonati, Milva Maria Figueiredo De Martino, Roberto Vilarta, Érika da Silva Maciel, Renato José Ferreira Sonati, Paulo Cézar Paduan
Rotating shiftwork is common for air traffic controllers and usually causes sleep deprivation, biological adaptations, and life changes for these workers. This study assessed quality of life, the sleep, and the health of 30 air traffic controllers employed at an international airport in Brazil. The objective was to identify health and quality of life concerns of these professionals. The results identified physical inactivity, overweight, excess body fat, low scores for physical and social relationships, and sleep deprivation for workers in all four workshifts...
August 2016: Workplace Health & Safety
Luenda E Charles, Desta Fekedulegn, Cecil M Burchfiel, Tara A Hartley, Michael E Andrew, John M Violanti, Diane B Miller
OBJECTIVE: To investigate associations between shiftwork and diurnal salivary cortisol among 319 police officers (77.7% men). METHODS: Information on shiftwork was obtained from the City of Buffalo, NY electronic payroll records. Saliva was collected using Salivettes at seven time points and analyzed for free cortisol concentrations (nmol/L) using a chemiluminescence immunoassay. Mean slopes and areas under the curve were compared across shift schedule using analysis of variance (ANOVA)/analysis of covariance (ANCOVA)...
June 2016: Journal of Occupational and Environmental Medicine
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