Details of a Researcher - Shimazu, Akihito

Papers - Shimazu, Akihito

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Resource Crafting: Is It Really 'Resource' Crafting-Or Just Crafting?

Hu Qiao, Schaufeli Wilmer B., Taris Toon W., Shimazu Akihito, Dollard Maureen F.

FRONTIERS IN PSYCHOLOGY 10 614 2019.03

Research paper (scientific journal), Accepted, ISSN 1664-1078

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Association between working hours, work engagement, and work productivity in employees: A cross-sectional study of the Japanese Study of Health, Occupation, and Psychosocial Factors Relates Equity

Okazaki E., Nishi D., Susukida R., Inoue A., Shimazu A., Tsutsumi A.

Journal of Occupational Health (Journal of Occupational Health) 61 ( 2 ) 182 - 188 2019.03

Research paper (scientific journal), Accepted, ISSN 13419145

© 2019 Japan Society for Occupational Health. Objectives: The aims of the study were to investigate the association between working hours, work engagement, and work productivity, and to examine if work engagement moderates the influence of working hours on work productivity. Methods: We used cross-sectional data from the Japanese occupational cohort survey, which involved 2093 employees in a manufacturing industry. Working hours were self-reported by the study participants. Work productivity was assessed with absolute presenteeism based on the scale of the validated Japanese version of World Health Organization Health and Work Performance Questionnaire (WHO-HPQ). Work engagement was assessed with the Nine-item Utrecht work Engagement Scale (UWES-9). Univariate and multivariable regression analyses were conducted to examine the association of working hours and work engagement with work productivity. We also carried out stratified multivariable regression analysis separately for those with high-work engagement and those with low-work engagement. Results: Working >40 to 50 hours per week and >50 hours per week were significantly positively associated with work productivity in univariate analysis. However, the significant association no longer held after adjusting for work engagement. Work engagement was positively associated with work productivity even after controlling for potential confounders. Working hours were not significantly associated with work productivity among those with high-work engagement or among those with low-work engagement. Conclusions: Working hours did not have any significant associations with work productivity when taking work engagement into account. Work engagement did not moderate the influence of working hours on work productivity, though it attenuated the relationship between working hours and work productivity.

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榊原圭子, 島津明人

産業医学ジャーナル (産業医学振興財団) 42 ( 1 ) 54 - 57 2019.01

Research paper (scientific journal), Accepted, ISSN 0388-337X

Factors associated with preschool workers' willingness to continue working

Tayama Jun, Yoshida Yuri, Iwanaga Ryoichiro, Tokunaga Akiko, Tanaka Goro, Imamura Akira, Shimazu Akihito, Shirabe Susumu

Medicine (Wolters Kluwer Health, Inc.) 97 ( 49 ) e13530 2018.12

Research paper (scientific journal), Accepted, ISSN 00257974

In industrialized countries, the turnover rate of preschool workers is extremely high and now represents a social problem. Consequently, it has become important to promote stable early care and educational environments for this population. Several factors related to working environments are known to affect turnover intention; however, the specific factors related to turnover intention among preschool workers have not yet been identified. Considering this, the objective of the present study was to determine factors associated with preschool workers' willingness to continue working.The participants of this study were 1137 preschool workers based in Nagasaki Prefecture, Japan. Multivariate logistic regression analysis was used to analyze the participants' data,with willingness to continue working for 5 years or more set as the dependent variable.Analysis of the results for all subjects clearly showed that male sex, older age, good mental health, high number of social supports, and good work engagement have a positive effect on willingness to continue working. Further, stratifying the participants in terms of age revealed that for preschool workers under 39 years, male sex,good mental health, high number of social supports, and good work engagement act positively in regard to willingness to continue working. Meanwhile, for those over 40 years, it was found that permanent employment and good work engagement act positively in this regard. Thus, work engagement was the only common factor between preschool workers under 39 and over 40.The findings of this cross-sectional study demonstrate that the factors associated with willingness to continue working among preschool workers differ between younger and older professionals. These findings underline the importance of considering age categories when attempting to maximize such professionals' willingness to continue working.

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Is too much work engagement detrimental? Linear or curvilinear effects on mental health and job performance

Shimazu A., Schaufeli W., Kubota K., Watanabe K., Kawakami N.

PLoS ONE (PLoS ONE) 13 ( 12 ) e0208684 2018.12

Research paper (scientific journal), Accepted, ISSN 1932-6203

© 2018 Shimazu et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Most studies report a positive relationship of work engagement with health and job performance, but, occasionally, a “dark side of engagement” has also been uncovered. The current study examined two hypotheses: whether work engagement has (1) a U-shaped curvilinear relation with psychological distress and (2) an inverted U-shaped curvilinear relation with job performance (i.e., in-role performance and creative behavior). A two-wave longitudinal Internet survey with a time lag of seven months was conducted among 1,967 Japanese employees. To test our hypotheses, we used a two-wave panel design and examined the lagged and concurrent relations between work engagement and both outcomes. The results confirmed that work engagement had a curvilinear relation with psychological distress concurrently; a favorable effect was found initially, but this disappeared at intermediate levels of work engagement, and, at higher levels, an adverse effect became prominent. In addition, work engagement had a curvilinear relation with in-role performance both concurrently and longitudinally; the higher the levels of work engagement, the stronger the favorable effects on in-role performance. However, contrary to our expectations, work engagement had a linear relation with psychological distress longitudinally and with creative behavior both concurrently and longitudinally. Hence, our results suggest that work engagement plays a different role in health enhancement compared to performance enhancement. Leveling-off and adverse effects of high work engagement were observed for psychological distress in the short and not in a long run. In contrast, no leveling-off effect of high work engagement was observed for job performance. Thus, except for the short-term effect on psychological distress, no dark side of work engagement was observed for psychological distress and job performance.

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Watanabe K., Sakuraya A., Kawakami N., Imamura K., Ando E., Asai Y., Eguchi H., Kobayashi Y., Nishida N., Arima H., Shimazu A., Tsutsumi A.

Obesity Reviews (Obesity Reviews) 19 ( 11 ) 1557 - 1568 2018.11

Research paper (scientific journal), Accepted, ISSN 14677881

© 2018 World Obesity Federation Background: Work-related psychosocial factors have been associated with metabolic syndrome. However, no systematic reviews or meta-analyses have evaluated this association. Methods: A systematic literature search was conducted, using PubMed, Embase, PsycINFO, PsycARTICLES and the Japan Medical Abstracts Society. Eligible studies included those that examined the previously mentioned association; had a longitudinal or prospective cohort design; were conducted among workers; provided sufficient data for calculating odds ratios, relative risks or hazard ratios with 95% confidence intervals; were original articles in English or Japanese; and were published no later than 2016. Study characteristics, exposure and outcome variables and association measures of studies were extracted by the investigators independently. Results: Among 4,664 identified studies, 8 were eligible for review and meta-analysis. The pooled risk of adverse work-related stress on metabolic syndrome onset was significant and positive (RR = 1.47; 95% CI, 1.22–1.78). Sensitivity analyses limiting only the effects of job strain and shift work also indicated a significant positive relationship (RR = 1.75; 95% CI, 1.09–2.79; and RR = 1.59; 95% CI, 1.00–2.54, P = 0.049 respectively). Conclusion: This study reveals a strong positive association between work-related psychosocial factors and an elevated risk of metabolic syndrome onset. The effects of job strain and shift work on metabolic syndrome appear to be significant.

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企業で働いている精神障害者におけるワーク・エンゲイジメントの影響要因の検討

徳丸史郎, 島津明人, 森越まや, 坂本光司

産業精神保健 ((一社)日本産業精神保健学会) 26 ( 4 ) 398 - 408 2018.11

Research paper (scientific journal), Accepted, ISSN 1340-2862

勤務間インターバルと疲労回復に関する縦断研究

高橋正也, 久保智英, 井澤修平, 三木圭一, 原谷隆史, 土屋政雄, 倉林るみい, 島津明人, 田中克俊, 池田大樹

労働安全衛生総合研究所特別研究報告 ((独)労働者健康安全機構労働安全衛生総合研究所) ( 48 ) 19 - 24 2018.11

Research paper (scientific journal), Accepted, ISSN 1882-8329

労働者の疲労回復を促進する対策に関する研究

高橋正也, 久保智英, 井澤修平, 三木圭一, 原谷隆史, 土屋政雄, 倉林るみい, 島津明人, 田中克俊, 池田大樹

労働安全衛生総合研究所特別研究報告 ((独)労働者健康安全機構労働安全衛生総合研究所) ( 48 ) 1 - 10 2018.11

Research paper (scientific journal), Accepted, ISSN 1882-8329

DEVELOPMENT OF TEACHING MATERIALS TO IMPROVE THE KNOWLEDGE AND SKILLS THAT MEDICAL STUDENTS SHOULD POSSESS TO PREVENT SUICIDE

Tsutsumi Akizumi, Chiba Hiroki, Moriya Rika, Inoue Akiomi, Shimazu Akihito

INTERNATIONAL JOURNAL OF BEHAVIORAL MEDICINE 25 S46 - S46 2018.10

Research paper (scientific journal), Accepted, ISSN 1070-5503

WIFE'S HAPPINESS OR DISTRESS? WHICH IS AFFECTING THE HUSBAND'S MENTAL HEALTH?

Iwata Noboru, Shimazu Akihito, Fujiwara Takeo, Kawakami Norito, Shimada Kyoko, Takahashi Masaya, Tokita Masahito, Watai Izumi

INTERNATIONAL JOURNAL OF BEHAVIORAL MEDICINE 25 S25 - S25 2018.10

Research paper (scientific journal), Accepted, ISSN 1070-5503

活き活き職場をつくるワーク・エンゲイジメントの視点で職場を再点検しよう (特集塩漬け人事よ、さようなら! ワーク・エンゲイジメントで活き活きした職場をつくる!)

島津明人

Nursing business = ナーシングビジネス (メディカ出版) 12 ( 10 ) 872 - 877 2018.10

Research paper (scientific journal), Accepted, ISSN 1881-5766

Short-term and long-term effects of off-job activities on recovery and sleep: A two-wave panel study among health care employees

de Jonge J., Shimazu A., Dollard M.

International Journal of Environmental Research and Public Health (International Journal of Environmental Research and Public Health) 15 ( 9 ) 2018.09

Research paper (scientific journal), Accepted, ISSN 16617827

© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This study examined whether particular recovery activities after work have a positive or negative effect on employee recovery from work (i.e., cognitive, emotional, and physical detachment) and sleep quality. We used a two-wave panel study of 230 health care employees which enabled looking at both short-term and long-term effects (i.e., two-year time interval). Gender, age, marital status, children at home, education level, management position, and working hours were used as control variables. Hierarchical multiple regression analyses showed that work-related off-job activities were negatively associated with cognitive and emotional detachment in both the short and long run, whereas low-effort off-job activities were positively related to cognitive detachment in the short run. Moreover, household/care off-job activities were positively related to sleep quality in the long run, whereas physical off-job activities were negatively associated with sleep quality in the long run. The long-term findings existed beyond the strong effects of baseline detachment and sleep quality. This study highlights the importance of off-job recovery activities for health care employees’ detachment from work and sleep quality. Practical implications and avenues for further research are discussed.

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Psychosocial factors at work and inflammatory markers: Protocol for a systematic review and meta-analysis

Eguchi H., Watanabe K., Kawakami N., Ando E., Arima H., Asai Y., Inoue A., Inoue R., Iwanaga M., Imamura K., Kobayashi Y., Nishida N., Otsuka Y., Sakuraya A., Tsuno K., Shimazu A., Tsutsumi A.

BMJ Open (BMJ Open) 8 ( 8 ) e022612 2018.08

Research paper (scientific journal), Accepted, ISSN 2044-6055

© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ. Introduction Chronic inflammation may be a mediator for the development of cardiovascular disease (CVD), metabolic diseases and psychotic and neurodegenerative disorders. Meta-analytic associations between work-related psychosocial factors and inflammatory markers have shown that work-related psychosocial factors could affect the flexibility and balance of the immune system. However, few systematic reviews or meta-analyses have investigated the association between work-related psychosocial factors and inflammatory markers. Based on prospective studies, the present investigation will conduct a comprehensive systematic review and meta-analysis of the association between work-related psychosocial factors and inflammatory markers. Methods and analysis The systematic review and meta-analysis will include published studies identified from electronic databases (PubMed, EMBASE, PsycINFO, PsycARTICLES, Web of Science and Japan Medical Abstracts Society) according to recommendations of the Meta-analysis of Observational Studies in Epidemiology guideline. Inclusion criteria are studies that: Examined associations between work-related psychosocial factors and increased inflammatory markers; used longitudinal or prospective cohort designs; were conducted among workers; provided sufficient data for calculating ORs or relative risk with 95% CIs; were published as original articles in English or Japanese; and were published up to the end of 2017. Study selection, data extraction, quality assessment and statistical syntheses will be conducted by 14 investigators. Any inconsistencies or disagreements will be resolved through discussion. The quality of studies will be evaluated using the Risk of Bias Assessment Tool for Non-randomized Studies. Ethics and dissemination The investigation study will be based on published studies, so ethics approval is not required. The results of this study will be submitted for publication in a scientific peer-reviewed journal. The findings may be useful for assessing risk factors for increased inflammatory markers in the workplace and determining future approaches for preventing CVD, metabolic diseases and psychotic and neurodegenerative disorders. PROSPERO registration number CRD42018081553.

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Differences in the effect of Internet-based cognitive behavioral therapy for improving nonclinical depressive symptoms among workers by time preference: Randomized controlled trial

Imamura K., Furukawa T., Matsuyama Y., Shimazu A., Kuribayashi K., Kasai K., Kawakami N.

Journal of Medical Internet Research (Journal of Medical Internet Research) 20 ( 8 ) e10231 2018.08

Research paper (scientific journal), Accepted, ISSN 1438-8871

© Kotaro Imamura, Toshi A Furukawa, Yutaka Matsuyama, Akihito Shimazu, Kazuto Kuribayashi, Kiyoto Kasai, Norito Kawakami. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 10.08.2018. This is an open-access article distributed under the terms of the Creative Commons Attribution License. Background: Previous randomized controlled trials (RCTs) have shown a significant intervention effect of internet-based computerized cognitive behavioral therapy (iCBT) on improving nonclinical depressive symptoms among healthy workers and community residents in a primary prevention setting. Time preference is one's relative valuation for having a reward (eg, money) at present than at a later date. Time preference may affect the effectiveness of cognitive behavioral therapy. Objective: This RCT aimed to test the difference of intervention effect of an iCBT program on improving nonclinical depressive symptoms between two subgroups classified post-hoc on the basis of time preference among workers in Japan. Methods: All workers in one corporate group (approximate n=20,000) were recruited. Participants who fulfilled the inclusion criteria were randomly allocated to either intervention or control groups. Participants in the intervention group completed 6 weekly lessons and homework assignments within the iCBT program. The Beck Depression Inventory-II (BDI-II) and Kessler's Psychological Distress Scale (K6) measures were obtained at baseline and 3-, 6-, and 12-month follow-ups. Two subgroups were defined by the median of time preference score at baseline. Results: Only few (835/20,000, 4.2%) workers completed the baseline survey. Of the 835 participants, 706 who fulfilled the inclusion criteria were randomly allocated to the intervention or control group. Participants who selected irrational time preference options were excluded (21 and 18 participants in the intervention and control groups, respectively). A three-way interaction (group [intervention/control] × time [baseline/follow-up] × time preference [higher/lower]) effect of iCBT was significant for BDI-II (t1147.42=2.33, P=.02) and K6 (t1254.04=2.51, P=.01) at the 3-month follow-up, with a greater effect of the iCBT in the group with higher time preference. No significant three-way interaction was found at the 6- and 12-month follow-ups. Conclusions: The effects of the iCBT were greater for the group with higher time preference at the shorter follow-up, but it was leveled off later. Workers with higher time preference may change their cognition or behavior more quickly, but these changes may not persist.

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ワーク・エンゲイジメントと産業保健心理学の国際動向 (特集広がる産業安全保健の国際協力)

島津明人

労働の科学 = Digest of science of labour (大原記念労働科学研究所) 73 ( 8 ) 462 - 465 2018.08

Research paper (scientific journal), Accepted, ISSN 0035-7774

Support for Self-Care of Individual Workers in Conjunction with Stress Check Program and Interview Manual for Occupational Health Staff

島津明人

ストレス科学 = The Japanese journal of stress sciences : 日本ストレス学会誌 (日本ストレス学会) 32 ( 4 ) 362 - 367 2018.06

Research paper (scientific journal), Accepted, ISSN 1349-4813

The impact of being bullied at school on psychological distress and work engagement in a community sample of adult workers in Japan

Iwanaga M., Imamura K., Shimazu A., Kawakami N.

PLoS ONE (PLoS ONE) 13 ( 5 ) e0197168 2018.05

Research paper (scientific journal), Accepted, ISSN 1932-6203

© 2018 Iwanaga et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Objective The aim of this study was to investigate the long-term impact of being bullied at school on current psychological distress and work engagement in adulthood among Japanese workers. We hypothesized that workers who had been bullied at school could have higher psychological distress and lower work engagement compared to those who had not been bullied. Methods We used data from the Japanese Study on Stratification, Health, Income, and Neighborhood (J-SHINE) project, conducted from July 2010 to February 2011 in Japan. This survey randomly selected the local residents around a metropolitan area in Japan. Of 13,920 adults originally selected, 4,317 people participated this survey, and the total response rate was 31%. The self-administered questionnaires assessed current psychological distress (K6), work engagement (UWES), the experiences of being bullied in elementary or junior high school and other covariates. Statistical analyses were conducted only for workers. Hierarchical multiple regression analyses were conducted to determine associations between experiences of being bullied at school and psychological distress/work engagement, with six steps. Result Statistical analysis was conducted for 3,111 workers. The number of respondents who reported being bullied in elementary or junior high school was 1,318 (42%). We found that the experience of being bullied at school was significantly associated with high psychological distress in adulthood (β = .079, p = < .0001); however, the work engagement scores of respondents who were bullied were significantly higher than for people who were not bullied at school (β = .068, p = < .0001), after adjusting all covariates. Conclusion Being bullied at school was positively associated with both psychological distress and work engagement in a sample of workers. Being bullied at school may be a predisposing factor for psychological distress, as previously reported. The higher levels of work engagement among people who experienced being bullied at school may be because some of them might have overcome the experience to gain more psychological resilience.

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産業保健国内関連ニュース第24回日本行動医学会学術総会

島田恭子, 島津明人

産業医学ジャーナル (産業医学振興財団) 41 ( 3 ) 43 - 46 2018.05

Research paper (scientific journal), Accepted, ISSN 0388-337X

ストレスチェック制度施行開始1年度の実施状況、有用性および課題　労働者へのインターネット調査

浅井裕美, 今村幸太郎, 堤明純, 島津明人, 井上彰臣, 廣尚典, 小田切優子, 吉川徹, 吉川悦子, 川上憲人

産業ストレス研究 (日本産業ストレス学会) 25 ( 2 ) 257 - 271 2018.04

Research paper (scientific journal), Accepted, ISSN 1340-7724

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