Papers - Shimazu, Akihito

Work-family conflict in Japan: how job and home demands affect psychological distress.

Shimazu A, Bakker AB, Demerouti E, Peeters MC.

Industrial Health 48 ( 6 ) 766 - 774 2010.07

Research paper (scientific journal), Joint Work, Accepted,  ISSN  0019-8366|1880-8026

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How does workaholism affect worker health and performance? The mediating role of coping.

Shimazu A, Schaufeli WB, Taris TW.

International Journal of Behavioral Medicine (International Journal of Behavioral Medicine)  17 ( 2 ) 154 - 160 2010.06

Research paper (scientific journal), Joint Work, Accepted,  ISSN  10705503

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Background: The underlying mechanisms connecting work-aholism on the one hand and ill-health and performance on the other hand have to date hardly been examined empirically. Purpose: The aim was to study the mediating role of coping (i.e., active coping and emotional discharge) in the relationship between workaholism, ill-health (i.e., psychological distress and physical complaints), and job performance. Method: A theory-based model was tested among 757 employees of a Japanese construction machinery company. Results: Workaholism was positively related to active coping, which was, in its turn, negatively associated with ill-health and positively with job performance. Workaholism was also positively related to emotional discharge, which was positively associated with ill-health. In addition, workaholism was positively and directly related to ill-health, whereas it was not significantly related to job performance. Conclusion: Workaholism is associated with both active coping and emotional discharge. Active coping leads to better health and performance, whereas emotional discharge leads to poor health. In addition, workaholism coincides with poor health. Since the costs for workaholics themselves (in terms of ill-health) are high, workaholism has on average adverse effects on health and performance. © 2010 International Society of Behavioral Medicine.

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A Longitudinal Test of the Demand-Control Model Using Specific Job Demands and Specific Job Control

Jan de Jonge, Natasja van Vegchel, Akihito Shimazu, Wilmar Schaufeli, Christian Dormann

INTERNATIONAL JOURNAL OF BEHAVIORAL MEDICINE (SPRINGER)  17 ( 2 ) 125 - 133 2010.06

Accepted,  ISSN  1070-5503

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Supportive studies of the demand-control (DC) model were more likely to measure specific demands combined with a corresponding aspect of control.
A longitudinal test of Karasek's (Adm Sci Q. 24:285-308, 1) job strain hypothesis including specific measures of job demands and job control, and both self-report and objectively recorded well-being.
Job strain hypothesis was tested among 267 health care employees from a two-wave Dutch panel survey with a 2-year time lag.
Significant demand/control interactions were found for mental and emotional demands, but not for physical demands. The association between job demands and job satisfaction was positive in case of high job control, whereas this association was negative in case of low job control. In addition, the relation between job demands and psychosomatic health symptoms/sickness absence was negative in case of high job control and positive in case of low control.
Longitudinal support was found for the core assumption of the DC model with specific measures of job demands and job control as well as self-report and objectively recorded well-being.

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Keyword ワーク・エンゲイジメント ワーク・エンゲイジメントが健康度向上と組織活性化の鍵になる (特集 働く人も職場も元気にする法--メンタルヘルス一次予防のキーワード)

島津 明人

へるすあっぷ21 (法研)   ( 306 ) 8 - 11 2010.04

Research paper (scientific journal), Accepted

The push and pull of work: The differences between workaholism and work engagement

Taris T., Schaufeli W., Shimazu A.

Work Engagement: A Handbook of Essential Theory and Research (Work Engagement: A Handbook of Essential Theory and Research)     39 - 53 2010.03

Research paper (scientific journal), Accepted,  ISSN  9780203853047

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国内外の産業医学に関する文献紹介 職場における個人向けストレス対策--介入方略の変遷と新たな視点

馬ノ段 梨乃, 土屋 政雄, 島津 明人

Occupational health journal (産業医学振興財団)  33 ( 2 ) 103 - 107 2010.03

Research paper (scientific journal), Accepted,  ISSN  0388337X

Association between workaholism and sleep problems among hospital nurses.

Kubota K, Shimazu A, Kawakami N, Takahashi M, Nakata A, Schaufeli WB.

Industrial Health 48 ( 6 ) 864 - 871 2010.01

Research paper (scientific journal), Joint Work, Accepted,  ISSN  0019-8366|1880-8026

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Organizational justice, psychological distress, and work engagement in Japanese workers.

Inoue A, Kawakami N, Ishizaki M, Shimazu A, Tsuchiya M, Tabata M, Akiyama M, Kitazume A, Kuroda M.

Archiv für Gewerbepathologie und Gewerbehygiene (International Archives of Occupational and Environmental Health)  83 ( 1 ) 29 - 38 2010.01

Research paper (scientific journal), Joint Work, Accepted,  ISSN  0340-0131

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Purpose To investigate the cross-sectional association between organizational justice (i.e., procedural justice and interactional justice) and psychological distress or work engagement, as well as the mediating roles of other job stressors (i.e., job demands and job control, or their combination, effort-reward imbalance [ERI], and worksite support). Methods A total of 243 workers (185 males and 58 females) from a manufacturing factory in Japan were surveyed using a self-administered questionnaire including the Organizational Justice Questionnaire, Job Content Questionnaire, Effort-Reward Imbalance Questionnaire, K6 scale, Utrecht Work Engagement Scale, and other covariates. Multiple mediation analyses with the bootstrap technique were conducted. Results In the bivariate analysis, procedural justice and interactional justice were significantly and negatively associated with psychological distress; they were significantly and positively associated with work engagement. In the mediation analysis, reward at work (or ERI) significantly mediated between procedural justice or interactional justice and psychological distress; worksite support significantly mediated between procedural justice or interactional justice and work engagement. Conclusion The effects of organizational justice on psychological distress seem to be mediated by reward at work (or ERI) while those regarding work engagement may be mediated by worksite support to a large extent, at least in Japanese workers.

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Semantic Analysis of Paragraphs Consisting of Multiple Sentences Towards Development of a Logical Formulation System

Takano Kenji, Nakamura Makoto, Oyama Yoshiko, Shimazu Akira

LEGAL KNOWLEDGE AND INFORMATION SYSTEMS 223   117 - 126 2010

Research paper (scientific journal), Accepted,  ISSN  978-1-60750-681-2

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Work-family conflict in Japan: how job and home demands affect psychological distress.

Shimazu A, Bakker AB, Demerouti E, Peeters MC

Industrial health 48 ( 6 ) 766 - 74 2010

Research paper (scientific journal), Accepted,  ISSN  0019-8366

Work-family Conflict in Japan: How Job and Home Demands Affect Psychological Distress

SHIMAZU Akihito, BAKKER Arnold B., DEMEROUTI Evangelia, PEETERS Maria C.W.

Ｉｎｄｕｓｔｒｉａｌ　ｈｅａｌｔｈ (独立行政法人 労働者健康安全機構 労働安全衛生総合研究所)  48 ( 6 ) 766 - 774 2010

Research paper (scientific journal), Accepted,  ISSN  0019-8366

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The aim of the present study was to examine how job and home demands are related to psychological distress in a sample of Japanese working parents with preschool children (n=196). We expected that job and home demands are partially related to psychological distress through work-to-family conflict (WFC) and family-to-work conflict (FWC), respectively. Structural equation modeling showed that, as expected, home demands were partially related to psychological distress, both directly and indirectly through FWC. In contrast, job demands were only directly related to psychological distress. The differences between the roles of FWC and WFC are discussed using identity theory.<br>

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職場のストレスとメンタルヘルス:－第一次予防の普及に向けて－

島津 明人, 原谷 隆史, 馬ノ段 梨乃, 髙田 未里

The Proceedings of the Annual Convention of the Japanese Psychological Association (The Japanese Psychological Association)  74 ( 0 ) WS063 - WS063 2010

Research paper (scientific journal), Accepted

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Intragroup and intergroup conflict at work, psychological distress, and work engagement in a sample of employees in Japan.

Tsuno K, Kawakami N, Inoue A, Ishizaki M, Tabata M, Tsuchiya M, Akiyama M, Kitazume A, Kuroda M, Shimazu A.

Industrial Health (Industrial Health)  47 ( 6 ) 640 - 648 2009.12

Research paper (scientific journal), Joint Work, Accepted,  ISSN  0019-8366|1880-8026

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The possible associations of intragroup and intergroup conflict at work with psychological distress and work engagement were investigated in a cross-sectional study in a manufacturing factory in Japan. A self-administered questionnaire was sent to all employees, and 255 responses were returned (a response rate of 84%). Data from 247 workers (187 males and 60 females) with no missing values were analyzed. Intragroup and intergroup conflict at work, psychological distress, and work engagement were measured by the NIOSH-GJSQ, K6, and Utrecht Work Engagement Scale (UWES-9), respectively. An ANCOVA was conducted to compare K6 and UWES-9 scores among the tertiles on intragroup conflict or intergroup conflict scores, adjusting for demographic and occupational variables as well as worksite social support, separately for males and females. Intragroup conflict was associated with greater psychological distress for males (p for trend=0.009). Intergroup conflict was marginally significantly associated with psychological distress for both males and females (p for trend=0.050 and 0.051, respectively). Contrary to expectation, intergroup conflict was significantly associated with greater work engagement for females (p for trend=0.024). For males, intragroup and intergroup conflict at work may increase psychological distress; for females, intergroup conflict may increase both psychological distress and work engagement.

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Towards a positive occupational health psychology: the case of work engagement (職場のメンタルヘルスとワーク・エンゲイジメント--国際学際交流シンポジウム)

島津 明人, Schaufeli Wilmar B.

ストレス科学 (日本ストレス学会)  24 ( 3 ) 181 - 187 2009.12

Research paper (scientific journal), Accepted,  ISSN  13494813

Is workaholism good or bad for employee well-being? The distinctiveness of workaholism and work engagement among Japanese employees.

Shimazu A, Schaufeli WB.

Industrial Health (Industrial Health)  47 ( 5 ) 495 - 502 2009.10

Research paper (scientific journal), Joint Work, Accepted,  ISSN  0019-8366|1880-8026

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The aim of the present study is to demonstrate the empirical distinctiveness of workaholism and work engagement by examining their relationships with well-being in a sample of 776 Japanese employees. We expected that workaholism is associated with unwell-being (i.e., high psychological distress and physical complaints, low job and family satisfaction, and low job performance), whereas work engagement is associated with well-being. Well-validated questionnaires were used to measure workaholism (DUWAS), work engagement (UWES), and well-being (BJSQ, HPQ). Structural Equation Modeling showed that, as expected, workaholism was positively associated with ill-health (i.e., psychological distress and physical complaints) and negatively associated with life satisfaction (i.e., job and family satisfaction) and job performance. In contrast, work engagement was negatively associated with ill-health and positively associated with life satisfaction and job performance. These findings suggest that workaholism and work engagement are two different kinds of concepts, which are negatively and positively related to various indicators of well-being, respectively.

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臨床心理学の最新知見(51)臨床心理学におけるストレス研究

島津 明人

Japanese journal of clinical psychology (金剛出版)  9 ( 4 ) 575 - 579 2009.07

Research paper (scientific journal), Accepted,  ISSN  13459171

集団認知行動療法の比較対照試験による効果検討(1)

中島 美鈴, 稗田 道成, 島田 俊夫, 島津 明人

精神科治療学 ((株)星和書店)  24 ( 7 ) 851 - 858 2009.07

Research paper (scientific journal), Accepted,  ISSN  0912-1862

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本研究の目的は、医療臨床現場における集団認知行動療法(GCBT)の効果についてコントロール群をおいた比較対照試験を行い実証的に検討することである。単科精神科病院の通院および入院患者のうちGCBTに参加を希望した69名(男性n=20、女性n=49)を対象に効果を検討した。その結果、うつ状態および不安状態の改善には有意な効果が認められた。今後は、介入効果に影響する要因についての検討が必要である。(著者抄録)

Effects of a worksite stress management training program with six short-hour sessions: a controlled trial among Japanese employees.

Umanodan R, Kobayashi Y, Nakamura M, Kitaoka-Higashiguchi K, Kawakami N, Shimazu A.

Journal of Occupational Health (Journal of Occupational Health)  51 ( 4 ) 294 - 302 2009.06

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1341-9145|1348-9585

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Objectives: The purpose of this study was to evaluate the effectiveness of a multi-component worksite stress management training (SMT) program among employees belong to Japanese steel company. Methods: Five workplaces were assigned to an intervention group and two workplaces to a control group. SMT with monthly 30-min sessions were provided to the intervention group for 6 mo. Intention- to-treat analyses were conducted among respondents of the intervention (n=96) and control groups (n=53). Results: Significant favorable intervention effects were found on knowledge (p<0.001) and marginally significant ones on professional efficacy (p=0.074) at one-month after completing the program. No significant intervention effects were observed on psychological distress, physical complaints, or job performance (p>0.05). However, in per-protocol analyses of those who attended all sessions, significant favorable effects were observed on psychological distress and job performance, as well as knowledge and professional efficacy (p<0.05). In addition, subgroup analyses revealed that those with initial low job control showed a favorable intervention effect only on knowledge (p<0.001), whereas those with initial high job control showed favorable intervention effects on knowledge (p<0.001), professional efficacy (p=0.023) and anxiety (p=0.033). Conclusions: The results suggest that the multi-component SMT program is effective at improving knowledge and professional efficacy, although job control appeared to moderate the effect of the program on professional efficacy. The program may also be effective at reducing psychological distress and increasing job performance, if participants complete all sessions.

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How Job Demands Affect an Intimate Partner : A Test of the Spillover-Crossover Model in Japan

Shimazu Akihito, Bakker Arnold B., Demerouti Evangelia

Journal of occupational health (Japan Society for Occupational Health)  51 ( 3 ) 239 - 248 2009.05

Research paper (scientific journal), Accepted,  ISSN  13419145

Being driven to work excessively hard : the evaluation of a two-factor measure of workaholism in The Netherlands and Japan

Schaufeli WB, Shimazu A, Taris TW

Cross-Cultural Research (Cross-Cultural Research)  43 ( 4 ) 320 - 348 2009.05

Research paper (scientific journal), Joint Work, Accepted,  ISSN  10693971

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Based on a conceptual analysis, a two-dimensional self-report questionnaire for assessing workaholism (work addiction) is proposed, including (1) working excessively hard and (2) working compulsively. Using independent explorative and confirmative samples that include employees from The Netherlands (N = 7,594) and Japan (N = 3,311), a questionnaire is developed and psychometrically evaluated. Results show that both scales (five items each) are internally consistent and that the hypothesized two-factor structure fits to the data of both countries. Furthermore, convergent validity was shown with measures of excess working time and discriminant validity was shown with measures of burnout and work engagement. Workaholics who work excessively hard and compulsively have a high relative risk on burnout and a low relative risk on work engagement. It is concluded that the two-dimensional measure-dubbed the Dutch Workaholism Scale (DUWAS)-is useful tool in future (cross-cultural) research on workaholism. © 2009 SAGE Publications.

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