Impact of shift work on cardiovascular functions in a 10-year follow-up study

Murata, Katsuyuki; Yano, Eiji; Shinozaki, T.

doi:10.5271/sjweh.434

Cited by 38 publications

(39 citation statements)

References 27 publications

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“…Likewise, job control and social supports were significantly related to job performance in male employees of a manufacturing company in Japan (Nagami et al 2010), but there were no significant relationships between them in female employees of the same company. Apart from the workrelated stress, QTc prolongation due to shift work has been reported in male workers (Murata et al 1999a(Murata et al , b, 2005 but not female nurses in Japan (Ishii et al , 2005. In this study, the presence/absence of shift work was used as a confounder of our multivariate model, but we could not find any significant relationship between shift work and autonomic indicators.…”

Section: Discussioncontrasting

confidence: 43%

“…That is, the proportions of such habits may have differed between workers and the general population. In addition, drinking habit was not significantly related to any autonomic nervous indicators in young adults , and smoking and drinking habits also were not significantly associated with QT intervals in an initial cohort with normal QT interval or without hypertension (Murata et al 1999a). For that reason, the characteristics of the present participants would not affect the external validity greatly.…”

Section: Discussionmentioning

confidence: 86%

“…Likewise, multiple logistic regression analysis was done to calculate the odds ratio (OR) and 95% confidence interval (CI) of work-related stress and home stress on autonomic indicators after adjusting for the confounders. As a cutoff value, asymptomatically abnormal QT was defined as QTc interval ≥ 420 ms 1/2 and QT index > 110 (Murata et al 1999a;Maeda et al 2015). High heart rate was defined as heart rate ≥ 75 beats/min according to the report on a predictor of sudden death (Jouven et al 2005).…”

Section: Discussionmentioning

confidence: 99%

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The Association between Work-Related Stress and Autonomic Imbalance among Call Center Employees in Japan

Enoki

Maeda

Iwata

et al. 2017

Tohoku J. Exp. Med.

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There is little epidemiological evidence linking subjective stress to objective etiologic indicators. To clarify an association between work-related stress and autonomic nervous function, we examined call center employees (167 males and 371 females) undergoing electrocardiography (ECG) at the time of annual health checkups. The questionnaire was composed of the Brief Job Stress Questionnaire based on the demand-control-support model and the Social Readjustment Rating Scale including detailed contents of home stress. The Bazett's corrected QT (QTc) interval, QT index, and heart rate were obtained from the ECG data. The male employees showed significantly higher scores of job demand, job control, and supervisor support than the female ones. In the male employees, QT index indicating the extent of autonomic imbalance and heart rate were associated with high score of supervisor support and low score of coworker support (P < 0.05), but no significant relationships were seen between QTc interval and either job strain (i.e., job demand and job control) or home stress. By contrast, the female employees showed no significant links between any autonomic indicators and either work-related stress or home stress. These data suggest that work-related stress affected QT index in male employees suffering specific occupational stressors such as emotional abuse from unsatisfied customers. Specifically, supports from supervisors and coworkers were paradoxically associated with QT index, implying that supervisors may have failed to effectively support such male employees. Also, autonomic nervous function in male employees appears to be more vulnerable to work-related stress than that in female ones.Keywords: autonomic nervous function; call center employees; demand-control-support model; electrocardiography; subjective job stress Tohoku J. Exp. Med., 2017 December, 243 (4), 321-328. © 2017 Tohoku University Medical Press IntroductionWith regard to the epidemiological evidence linking work-related stress to cardiovascular disease, the stress and cardiovascular disease are not directly tied but mediated by a certain etiologic mechanism. However, there is less research on the etiological pathways of the disease causation (Schnall et al. 1994). Collins et al. (2005) examined electrocardiographic QT intervals for 36 healthy men wearing 48-h Holter-monitor, and one mechanism suggested by them was the disturbed cardiovascular regulatory pattern associated with job strain in a pathogenic manner. In this case, it may not be easy to examine a large number of workers with 48-h monitor. Another mechanism was concerning autonomic imbalance induced by home stress (Maeda et al. 2015), but not work-related stress. For the earlier prevention of work-related cardiovascular events and a better understanding of the pathophysiology, it is important to investigate the association between workrelated stress and autonomic outcomes by using simpler tools.As a measure of work-related stress, the job demandcontrol-support (DCS) model with three dimensions (i...

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Section: Discussioncontrasting

confidence: 43%

Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

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The Association between Work-Related Stress and Autonomic Imbalance among Call Center Employees in Japan

Enoki

Maeda

Iwata

et al. 2017

Tohoku J. Exp. Med.

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“…Shift-and nightwork have been associated with considerable negative impacts on health and well-being. Effects have been reported for cardiovascular (3)(4)(5)(6)(7) and gastrointestinal (8,9) health, obesity (10,11), the metabolic syndrome (12), sleepiness (13), need for recovery from work (14), fatigue (15)(16)(17)(18)(19), accidents (8), and well-being (20).…”

mentioning

confidence: 99%

Direction of shift rotation among three-shift workers in relation to psychological health and work-family conflict

Amelsvoort¹,

Jansen²,

Swaen³

et al. 2004

Scand J Work Environ Health

111

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van Amelsvoort LGPM, Jansen NWH, Swaen GMH, van den Brandt PA, Kant I. Direction of shift rotation among three-shift workers in relation to psychological health and work-family conflict. Scand J Work Environ Health 2004;30(2):149-156. ObjectivesThe aim of the present study was to investigate whether the direction of shift rotation was related to the need for recovery, fatigue, sleep quality, work-family conflict, and leisure time among three-shift workers.Methods Data of 95 workers in forward-rotating three-shift work and 681 workers in backward-rotating threeshift work, with 32 months of follow-up, in the Maastricht cohort study (N=12 095) were used. Both crosssectional and longitudinal analyses were carried out.Results A backward rotation schedule was prospectively related to an increased need for recovery [relative risk (RR) 2.88, 95% confidence interval (95% CI) 1.06-7.81] and poor general health (RR 3.21, 95% CI 1.32-7.83), as compared with a forward rotation schedule. Adjustment for demographic and health variables and the characteristics of the work environment did not alter these relations considerably. Furthermore, a forward rotation schedule was prospectively related to less work-family conflict and better sleep quality over the 32 months of follow-up. Finally, high levels of fatigue, need for recovery, poor sleep quality, poor general health, insufficient leisure time, and work-family conflict at first measurement were associated with an increased risk of leaving shiftwork during the follow-up. ConclusionsOptimization of shiftwork schedules, in terms of shift rotation, seems a promising method for decreasing the negative impact accompanying shiftwork. Future studies should investigate whether these findings for three-shift workers are applicable to other shiftwork schedules as well. Furthermore, this study clearly illustrates the existence of secondary selection processes among shiftworkers and thereby emphasizes the complexity of valid shiftwork research.

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“…In contrast, one study has suggested that blood pressure among day workers is higher (14). However, in some studies, no significant relationships were found between shift work and blood pressure (15)(16)(17)(18). A retrospective 24-year cohort study demonstrated no statistically significant relationship between shift work and high blood pressure (19).…”

Section: Introductionmentioning

confidence: 79%

Blood Pressure Modifications during Shift Work among Workers in Isfahan City, Iran

Ghazanfari

Kazemnejad

Fesharaki

et al. 2016

Iran Red Crescent Med J

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Background: Several factors affect the emergence of high blood pressure, among which include environmental and occupational factors. Shift work is currently a commonly used program at workplaces. Objectives: The purpose of this study was to determine the impact of shift work on blood pressure changes. Patients and Methods:The data used in this retrospective cohort study was collected using annual observations conducted in the Diseases Follow-up Unit, Industrial Medicine Unit of the Occupational Health Center of the Mobarakeh Steel company from 2007 to 2010. In this study, the effect of shift work on systolic and diastolic blood pressure changes were analyzed by controlling for the body mass index (BMI), age, and educational levels using multilevel models. Results: This study included 5,351 people (45.2% on the day shift, 6% on the weekly rotation shift, and 48.8% on a normal rotation shift). By controlling the confounding factors, shift work showed a significant relationship with systolic blood pressure (P = 0.01) but failed to show any significant relationships with diastolic blood pressure (P = 0.08). Conclusions: According to the results of this study, it seems that shift work can be considered a risk factor for high blood pressure changes. It is recommended that workers who are working in shifts are more at risk and need more supervision.

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Impact of shift work on cardiovascular functions in a 10-year follow-up study

Cited by 38 publications

References 27 publications

The Association between Work-Related Stress and Autonomic Imbalance among Call Center Employees in Japan

The Association between Work-Related Stress and Autonomic Imbalance among Call Center Employees in Japan

Direction of shift rotation among three-shift workers in relation to psychological health and work-family conflict

Blood Pressure Modifications during Shift Work among Workers in Isfahan City, Iran

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