Cardiovascular disease is a class of diseases involving the heart or blood vessels, which accounts for about one-third of all deaths worldwide each year. Unhealthy diet, lack of physical activity, smoking and excessive alcohol consumption are all risk factors for cardiovascular disease. With the increasing number of night shift workers, the number of patients with cardiovascular disease has increased, and night shift work has gradually become a risk factor of cardiovascular disease. At present, the mechanism of cardiovascular disease caused by night shift work is still unclear. This review summarizes the relationship between night shift work and cardiovascular disease and its related biochemical indicators, and discusses the research on related mechanisms.
Humans ; Shift Work Schedule/adverse effects* ; Work Schedule Tolerance ; Cardiovascular Diseases ; Risk Factors ; Smoking

INTRODUCTION: As the traditional overnight call system was shown to contribute to fatigue, Singapore implemented a shift system in 2014. We aimed to compare activity levels, sleep (using a wrist actigraph), fatigue and professional quality of life between residents working on night float and those on overnight calls. METHODS: All Postgraduate Year 1 (PGY1) residents at our institution were invited to participate. Participants were required to wear a wrist actigraph for four months and complete two validated surveys (Epworth Sleepiness Scale [ESS] and Professional Quality of Life [ProQOL] scale) once each at the start and end of the study. RESULTS: 49 residents were recruited. Night float and on-call residents showed a comparable median (range) number of steps (10,061 [1,195-15,923] vs. 10,649 [308-21,910]; p = 0.429), amount of sleep logged (361 [149-630] minutes vs. 380 [175-484] minutes; p = 0.369) and time taken to fall asleep (6 [0-14] minutes vs. 6 [range 0-45] minutes; p = 0.726), respectively. Night float residents had less efficient sleep, with 90.5% having sleep efficiency of over 85% compared to 100% of on-call residents (p = 0.127). More night float residents reported ESS scores > 10 (73.1% vs. 38.5%) and higher burnout scores on ProQOL scale (41.4% vs. 21.4%) at the start of the study. However, this was similar to the end of the study and not statistically significant. CONCLUSION Physical activity and amount of sleep were not significantly different between night float and on-call residents. Residents on night float reported comparatively more fatigue and burnout.
Adult ; Burnout, Professional ; Exercise ; Fatigue ; Female ; Humans ; Internship and Residency ; Male ; Physicians ; Prospective Studies ; Quality of Life ; Singapore ; Sleep ; Surveys and Questionnaires ; Work Schedule Tolerance ; Workload

BACKGROUND: Shift workers are increasing worldwide, and various negative health effects of shift work have been reported. This study aimed to evaluate the relationship between shift work and health behavior. METHODS: This cross-sectional study included a total of 11,680 Korean adults (6,061 men and 5,619 women) aged ≥20 years old who participated in the Fifth Korean National Health and Nutrition Examination Survey, 2010–2012. Multiple logistic regression analysis was performed to evaluate the association between shift work and health behavior after adjusting for covariates. RESULTS: In men, shift work was associated with an increased risk of inadequate sleep (odds ratio [OR], 1.18; 95% confidence interval [CI], 1.00 to 1.40) compared to day work. In women, shift work was associated with an increased risk of smoking (OR, 1.73; 95% CI, 1.34 to 2.22) and inadequate sleep (OR, 1.24; 95% CI, 1.05 to 1.47) compared to day work. In an age-stratified subgroup analysis, female shift workers aged ≥50 years old demonstrated an increased risk of smoking (OR, 5.55; 95% CI, 3.60 to 8.55), alcohol consumption (OR, 2.22; 95% CI, 1.53 to 3.23), and inadequate sleep (OR, 1.50; 95% CI, 1.10 to 2.05) compared to female day workers. CONCLUSION: Shift work is associated with worse health behavior, and this is most evident in women aged ≥50 years. Targeted strategies to reduce the negative health effects of shift work should be implemented, with consideration of shift workers' demographic characteristics.
Adult ; Alcohol Drinking ; Alcoholism ; Cross-Sectional Studies ; Female ; Health Behavior* ; Humans ; Logistic Models ; Male ; Nutrition Surveys* ; Sleep Wake Disorders ; Smoke ; Smoking ; Work Schedule Tolerance

No abstract available.
Sleep ; Work Schedule Tolerance ; Metabolic Syndrome X ; Occupational Diseases ; Health Behavior ; Obesity ; Nutrition Surveys

PURPOSE: This study aimed to explore personal as well as occupational factors and health status associated with work-life balance in Korean registered nurses. METHODS: This study was a secondary data analysis using cross-sectional nationally representative data from the Korean Working Conditions Survey (KWCS) in 2014. Study participants included 450 registered nurses in South Korea. Descriptive analysis, Independent t-test, χ² test, and Logistic regression analyses were performed using the SPSS 21.0 statistical program. RESULTS: Work-life balance was reported in 70.6% individuals with 85.7% being male and 70.0% being female nurses. Logistic regression analysis revealed that being male good health state, having less than 40-hour working week, lower number of night duty, policy on flexible work arrangement were significant predictors of work-life balance. CONCLUSION: This study provided evidence that identify predictors of work-life balance in registered nurses in South Korea. Therefore, we need the actively support health care service promotion and prevention for work-life balance predictors.
Delivery of Health Care ; Female ; Humans ; Korea ; Logistic Models ; Male ; Nurses* ; Statistics as Topic ; Work Schedule Tolerance

OBJECTIVETo investigate the relationship between work in shifts and occupational stress.

METHODSA total of 5338 employees from 13 companies were investigated by cluster sampling, and occupational stress measuring tools, job content questionnaire, and effort-reward imbalance questionnaire were used to investigate occupational stress factors, stress reaction, and the condition of work in shifts.

RESULTSThe employees who worked in shifts accounted for 46.6%. The condition of work in shifts varied significantly across different companies, employees with different individual features (including sex, job title, degree of education, age, working years, smoking, and drinking), and employees with different weekly working times(P<0.01 or P<0.05); health status was associated with work in shifts(P<0.01); compared with the employees who did not work in shifts, those who worked in shifts had significantly lower scores of technology utilization, work control level, psychological need, reward, social support, and job satisfaction(P<0.01 or P<0.05), as well as significantly higher scores of physical demands, effort, depressive symptoms, and negative affectivity(P<0.01).

CONCLUSIONWork in shifts can affect health status, and is associated with occupational stress.

Depression ; Health Status ; Humans ; Job Satisfaction ; Occupational Diseases ; epidemiology ; Smoking ; Social Support ; Stress, Psychological ; Surveys and Questionnaires ; Work Schedule Tolerance

PURPOSE: The purpose of this study was to identify the factors affecting shiftwork tolerance among nurses and provide basic data, ultimately, in formulating a plan for improving their shiftwork tolerance. METHODS: The participants were 317 nurses who were working at three general hospitals in Daejeon and Seoul. Data analyzed t-test, ANOVA, correlation analysis, and regression analysis using SPSS 20.0 program. RESULTS: As for the sub-areas of shiftwork tolerance for the respondents, more than a half of nurses working at shifts suffered from insomnia, felt drowsy, complained of chronic fatigue, and were at the anxious and depressed state. Shiftwork tolerance differed by the daily intake of coffee and exercise. Shiftwork tolerance was significantly positively correlated with sleep-wake habits, hardiness, and flexibility and negatively correlated with a languidity. Regression analysis revealed that shiftwork tolerance was affected by age, sleep-wake habits, languidity, flexibility, and hardiness. CONCLUSION: To put the results, nurses had shiftwork tolerance affected by sleep-wake habits, languidity, and hardiness. It is therefore necessary to make a scheme for allowing nurses to improve hardiness and flexibility and decrease the languidity with the objective of improving their shiftwork tolerance.
Circadian Rhythm ; Coffee ; Fatigue ; Hospitals, General ; Pliability ; Seoul ; Sleep Initiation and Maintenance Disorders ; Sleep Wake Disorders ; Surveys and Questionnaires ; Work Schedule Tolerance

PURPOSE: The aim of this study was to identify influencing factors for sleep quality among shift-working nurses based on a three-factor scoring model that included sleep efficacy, sleep quality and daily dysfunction. METHODS: A cross-sectional survey of 513 nurses in a hospital in Shanghai, China, was conducted using a self-reported questionnaire. Sleep quality was measured by the Pittsburgh Sleep Quality Index (PSQI). Data were analyzed based on the three-factor PSQI model: Factor 1, sleep efficacy; Factor 2, sleep quality; Factor 3, daily disturbances. RESULTS: After adjusting for age, marital status, and having children, multivariate logistic regression analysis showed that participants who had previous shift work experience which was at least 6 months ago, or were currently performing shift work were significantly more likely to have poor sleep quality (PSQI > 5) than those who had never done shift work (adjusted odds ratios of 3.943 and 3.975, respectively, both p < .001). Mean scores of the three individual factors increased significantly among nurses currently performing shift work compared with those who had never done shift work (Factor 1, β = 0.61, p < .001; Factor 2, β = 1.86, p < .001; Factor 3, β = 0.45, p = .002). Mean scores of Factor 2 and Factor 3 increased significantly among nurses with previous shift work experience compared with those who had never done shift work (Factor 2, β = 1.15, p = .003; Factor 3, β = 0.52, p = .005). CONCLUSIONS: Performing current shift work and performing shift work previously were significantly associated with poor sleep quality. An appropriate arrangement and intervention strategies are needed in Chinese hospitals in order to improve sleep quality among shift-working nurses.
Adult ; China/epidemiology ; Cross-Sectional Studies ; Female ; Humans ; Male ; Nurses/*statistics & numerical data ; Risk Factors ; Sleep/*physiology ; Sleep Deprivation/*epidemiology ; Work Schedule Tolerance/*physiology

Adult ; Age Factors ; Burnout, Professional ; epidemiology ; Female ; Health Status ; Humans ; Male ; Marital Status ; Mental Health ; Occupational Health ; Orthopedic Surgeons ; statistics & numerical data ; Pain ; epidemiology ; Personnel Staffing and Scheduling ; Sex Factors ; Singapore ; epidemiology ; Social Behavior ; Stress, Psychological ; epidemiology ; Surveys and Questionnaires ; Work Schedule Tolerance

PURPOSE: There is a growing concern that accumulated fatigue due to extended working hours may contribute to poor surgical outcomes. This study aimed to compare postoperative complications of gastric cancer patients according to operation chronology in a given day as a yardstick of a surgeon's fatigue.METHODS: The clinicopathologic data of gastric cancer patients who underwent a curative gastrectomy by one surgeon in Asan Medical Center from August 2012 to August 2014 were analyzed retrospectively. The patients were divided into 3 groups according to operation chronology in a given day. Perioperative data were collected by electronic medical records. Comorbidities were assessed using the Charlson comorbidity index. Postoperative complications were categorized according to the Clavien-Dindo classification.RESULTS: A total of 517 patients were divided into three groups according to chronological order of the surgery in one day. Each group exhibited similar characteristics except for operation time (P=0.001) and the America Society of Anesthesiologists score (P=0.01). Operations conducted late in the day tended to require more time and were associated with more comorbidities. However, no significant differences were detected between the chronological order of operation in a given day and postoperative complications.CONCLUSION: The chronological order of three gastrectomies performed by one surgeon in a day was not associated with postoperative complications rate.
Americas ; Chungcheongnam-do ; Classification ; Comorbidity ; Electronic Health Records ; Fatigue ; Gastrectomy ; Humans ; Postoperative Complications ; Retrospective Studies ; Stomach Neoplasms ; Work Schedule Tolerance