研究者詳細 - 島津　明人

論文 - 島津　明人

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Japanese dietary pattern consistently relates to low depressive symptoms and it is modified by job strain and worksite supports

Suzuki T, Miyaki K, Tsutsumi A, Hashimoto H, Kawakami N, Takahashi M, Shimazu A, Inoue A, Kurioka S, Kakehashi M, Sasaki Y, Shimbo T, For the J-HOPE study group (the Japanese study of Health, Occupation, and Psychosocial factors related Equity)

Journal of Affective Disorders （Journal of Affective Disorders） 150 （ 2 ） 490 - 498 2013年

研究論文（学術雑誌）, 共著, 査読有り, ISSN 01650327

Background This study examined the association between traditional Japanese dietary pattern and depressive symptoms in Japanese workers, employing large-scale samples, considering socioeconomic status (SES) and job stress factors. Methods A cross-sectional study of 2266 Japanese employees aged 21-65 years from all areas of Japan was conducted as part of the Japanese Study of Health, Occupation and Psychosocial factors related Equity (J-HOPE). Habitual diet was assessed by FFQ (BDHQ). The depression degree and job stress factors (job demand, job control, and worksite support) were measured by K6 and Job Content Questionnaire. Results Participants with high scores for the balanced Japanese dietary pattern were significantly less likely to show probable mood/anxiety disorders (K6≥9) with multivariate adjustment including SES and job stress factors (odds ratio=0.66 [0.51-0.86], trend P=0.002). Other dietary patterns were not associated with depressive symptoms. Even after stratification by job stress factors, the Japanese dietary pattern was consistently protective against depressive symptoms. Furthermore, a highly significant difference between the first and third tertiles of the dietary pattern was observed in participants with active strain (high demand and high control) with low worksite supports (8.5 vs. 5.2, P=0.011). Limitations Female participant sample was relatively small. Conclusions Japanese dietary pattern consistently related to low depressive symptoms in this large-scale cohort of Japanese workers, even after adjusting for SES and job stress factors. The protective impact is especially strong for workers with active strain and low support. Making better use of traditional dietary patterns may facilitate reducing social disparities in mental health. © 2013 Elsevier B.V.

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Psychosocial mechanisms of psychological health disparity in Japanese workers

Shimazu A, Kawakami N, Kubota K, Inoue A, Kurioka S, Miyaki K, Takahashi M, Tsutsumi A

Industrial Health （Industrial Health） 51 （ 5 ） 472 - 481 2013年

研究論文（学術雑誌）, 共著, 査読有り, ISSN 00198366

Recent epidemiologic research has shown that people with higher socioeconomic status (SES) (e.g., educational attainment) have better psychological health than those with lower SES. However, the psychosocial mechanisms of underlying this relationship remain unclear. To fill this gap, the current study examines the mediating effects of job demands and job resources in the relationship between educational attainment and psychological distress. The hypothesized model was tested using large data sets from two different studies: a cross-sectional study of 9,652 Japanese employees from 12 workplaces (Study 1), and a longitudinal study of 1,957 Japanese employees (Study 2). Structural equation modeling revealed that (1) educational attainment was positively related to psychological distress through job demands, (2) educational attainment was negatively related to psychological distress through job resources, and (3) educational attainment was not directly related to psychological distress. These results suggest that educational attainment has an indirect effect, rather than a direct one, on psychological distress among workers; educational attainment had both a positive and a negative relationship to psychological distress through job demands and job resources, respectively. © 2013 National Institute of Occupational Safety and Health.

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Workaholism as a risk factor for depression, disabling back pain, and sickness absence among Japanese workers

Matsudaira K, Shimazu A, Fujii T, Kubota K, Sawada T, Kikuchi N, Takahashi M

PLoS ONE （PLoS ONE） 8 （ 9 ） e75140 - doi:10.1371/journal.pone.00751 2013年

研究論文（学術雑誌）, 共著, 査読有り, ISSN 1932-6203

Objectives:Although it is understood that work-related factors, including job demands, job control, and workplace support, are associated with workers' health and well-being, the role played by personal characteristics, especially workaholism, has not been fully investigated. This study examined workaholism's associations with psychological ill health, low back pain with disability, and sickness absence among Japanese workers.Methods:A cross-sectional Internet survey was conducted using self-administered questionnaires. Data from 3,899 Japanese workers were analyzed. Workaholism was measured using the Dutch Workaholism Scale (DUWAS). Scores were divided into tertiles, where respondents were classified into three groups (high, middle, and low). Depressive mood as a measure of psychological ill health was assessed using the SF-36 mental health subscale, and low back pain using a standardized question. Sickness absence, except that due to physical injuries, was categorized either as absence due to mental health problems or to physical/somatic problems including the common cold. Multiple logistic regression analyses were conducted to examine the association between workaholism and depressive mood, low back pain with disability, and sickness absence, adjusting for demographic characteristics, job demand, job control, and workplace support.Results:Compared to the low workaholism group, the middle and high workaholism groups had significantly higher odds for depressive mood (Odds ratio (OR) = 1.93 and 3.62 for the middle and high groups, respectively), disabling back pain (ORs = 1.36 and 1.77 for the middle and high groups, respectively). Workaholism was more strongly associated with sickness absence due to mental health problems than that for other reasons (ORs = 1.76 vs. 1.21 for the middle group and 3.52 vs. 1.37 for the high groups).Conclusions:Workaholism is significantly associated with poor psychological health, disabling back pain, and sickness absence, particularly from mental health problems. Therefore, workaholism must be considered when addressing well-being of workers. © 2013 Matsudaira et al.

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インタビュー「健康いきいき職場づくり」でポジティブなメンタルヘルス対策を : 東京大学大学院医学系研究科精神保健学分野川上憲人教授/島津明人准教授に聞く (特集職場の活性化を考える)

川上憲人, 島津明人

ワークライフ = Work life （日本生産性本部生産性労働情報センター） 2 3 - 9 2013年

研究論文（学術雑誌）, 査読有り

未就学児を持つ共働き夫婦におけるワーク・ライフ・バランスと精神的健康　1年間の縦断データから

島田恭子, 島津明人, 川上憲人

厚生の指標（(一財)厚生労働統計協会） 59 （ 15 ） 10 - 18 2012年12月

研究論文（学術雑誌）, 査読有り, ISSN 0452-6104

目的従来のワーク・ライフ・バランス(以下,WLB)と精神的健康に関する研究では横断研究が多く要因間の因果関係を特定できない限界があった。また「仕事と家庭役割間のネガティブなスピルオーバー」が主に注目され「両役割間のポジティブなスピルオーバー」を考慮した研究は少ない。本研究は,両役割間のネガティブおよびポジティブなスピルオーバーが心理的ストレス反応に与える影響を,縦断データを用いて検討することを目的とした。方法ベースライン調査(T1:2008年11月)は都内某区の保育園に子どもを通わせる共働き夫婦を対象に実施され2,992名が回答した。フォローアップ調査(T2:2010年1月)は,T1調査時にT2調査への参加に同意した1,466名を対象に実施され,963名が回答した(追跡率65.7%)。本研究では,両調査での有効回答者894名(男性394名,女性500名)を分析対象とした。解析は,心理的ストレス反応(T2)を従属変数とし,以下のステップで独立変数を追加投入する階層的重回帰分析を男女別に行った。ステップ1:基本属性(T1),ステップ2:心理的ストレス反応(T1),ステップ3:仕事領域変数(T1:量的負担,裁量権,サポート),ステップ4:家庭領域変数(T1:量的負担,裁量権,サポート),ステップ5:WLB変数(T1:仕事から家庭へのネガティブ・スピルオーバー,家庭から仕事へのネガティブ・スピルオーバー,仕事から家庭へのポジティブ・スピルオーバー,家庭から仕事へのポジティブ・スピルオーバー)結果男性ではステップ5で,仕事から家庭へのネガティブ・スピルオーバー(T1)が,心理的ストレス反応(T2)と正の関連を示していた。女性では家庭での量的負担(T1)が正の関連を,家庭での裁量権(T1)が負の関連を示していた。ポジティブ・スピルオーバーは,男女ともに心理的ストレス反応(T2)と有意な関連を示さなかった。結論男性では仕事から家庭へのネガティブなスピルオーバーが1年後の心理的ストレス反応の高さに関連している一方,女性では家庭の量的負担と裁量権が1年後の心理的ストレス反応に関連していた。わが国の共働き夫婦の精神的健康を考える際,男性では仕事から家庭へのネガティブなスピルオーバーに,女性では家庭での負担の低減と裁量権を上げることの重要性が示唆された。本研究ではポジティブ・スピルオーバーは,男女ともに1年後の心理的ストレス反応と有意な関連を示さなかったが,さらに他の健康アウトカムとの関連を含め研究が行われるべきである。(著者抄録)

未就学児を持つ共働き夫婦におけるワーク・ライフ・バランスと精神的健康 : 1年間の縦断データから

島田恭子, 島津明人, 川上憲人

厚生の指標（厚生労働統計協会） 59 （ 15 ） 10 - 18 2012年12月

研究論文（学術雑誌）, 共著, 査読有り, ISSN 0452-6104

海外のリワーク事情 : オランダの復職支援システムに注目して (特集気分障害のリワークプログラム)

島津明人, 今村幸太郎

臨床精神医学（アークメディア） 41 （ 11 ） 1601 - 1606 2012年11月

研究論文（学術雑誌）, 査読有り, ISSN 0300-032X

HEALTH INEQUALITIES AMONG JAPANESE WORKERS: JAPANESE STUDY OF HEALTH, OCCUPATION AND PSYCHOSOCIAL FACTOR

Tsutsumi A., Inoue A., Kurioka S., Miyaki K., Takahashi M., Shimazu A., Kosugi Y., Enta K., Eguchi H., Kawakami N.

INTERNATIONAL JOURNAL OF BEHAVIORAL MEDICINE 19 S19 - S20 2012年09月

研究論文（学術雑誌）, 査読有り, ISSN 1070-5503

LONGITUDINAL EFFECTS OF WORK-FAMILY SPILLOVER: IMPACTS ON PSYCHOLOGICAL DISTRESS AMONG JAPANESE DUAL-EARNER COUPLES WITH PRESCHOOL CHILDREN

Shimada K., Shimazu A., Bakker A. B., Demerouti E., Kawakami N.

INTERNATIONAL JOURNAL OF BEHAVIORAL MEDICINE 19 S18 - S19 2012年09月

研究論文（学術雑誌）, 査読有り, ISSN 1070-5503

TOWARDS HEALTHY EMPLOYEES IN A HEALTHY ORGANIZATION: A WEB-BASED QUESTIONNAIRE FOR WORKPLACE ASSESSMENT (ACTIVE)

Shimazu A., Kawakami N.

INTERNATIONAL JOURNAL OF BEHAVIORAL MEDICINE 19 S328 - S328 2012年09月

研究論文（学術雑誌）, 査読有り, ISSN 1070-5503

Sleep and fatigue associated with levels of worktime control and worktime variability: a cross-sectional investigation

Takahashi M., Kubo T., Liu X., Togo F., Shimazu A., Tanaka K., Uchiyama T.

JOURNAL OF SLEEP RESEARCH 21 270 - 270 2012年09月

研究論文（学術雑誌）, 査読有り, ISSN 0962-1105

ORGANIZATIONAL JUSTICE AND PSYCHOLOGICAL DISTRESS AMONG JAPANESE WORKERS WITH HIGH OR LOW JOB INSECURITY: FINDINGS FROM THE JAPANESE STUDY OF HEALTH, OCCUPATION, AND PSYCHOSOCIAL FACTORS RELATED EQUITY (J-HOPE)

Inoue A., Kawakami N., Tsutsumi A., Shimazu A., Miyaki K., Takahashi M., Kurioka S., Eguchi H., Enta K., Kosugi Y., Sakata T.

INTERNATIONAL JOURNAL OF BEHAVIORAL MEDICINE 19 S312 - S313 2012年09月

研究論文（学術雑誌）, 査読有り, ISSN 1070-5503

WORKAHOLISM AND SLEEP QUALITY AMONG JAPANESE EMPLOYEES: FINDING FROM A PROSPECTIVE COHORT STUDY

Kubota K., Shimazu A., Kawakami N., Takahashi M.

INTERNATIONAL JOURNAL OF BEHAVIORAL MEDICINE 19 S108 - S109 2012年09月

研究論文（学術雑誌）, 査読有り, ISSN 1070-5503

Do workaholism and work engagement predict employee well-being and performance in opposite directions?

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

Industrial Health （Industrial Health） 50 （ 4 ） 316 - 321 2012年08月

研究論文（学術雑誌）, 査読有り, ISSN 00198366

This study investigated the distinctiveness between workaholism and work engagement by examining their longitudinal relationships (measurement interval=7 months) with well-being and performance in a sample of 1,967 Japanese employees from various occupations. Based on a previous cross-sectional study (Shimazu & Schaufeli, 2009), we expected that workaholism predicts future unwell-being (i.e., high ill-health and low life satisfaction) and poor job performance, whereas work engagement predicts future well-being (i.e., low ill-health and high life satisfaction) and superior job performance. T1-T2 changes in ill-health, life satisfaction and job performance were measured as residual scores that were then included in the structural equation model. Results showed that workaholism and work engagement were weakly and positively related to each other. In addition, workaholism was related to an increase in ill-health and to a decrease in life satisfaction. In contrast, work engagement was related to a decrease in ill-health and to increases in both life satisfaction and job performance. These findings suggest that workaholism and work engagement are two different kinds of concepts that are oppositely related to well-being and performance. © 2012 National Institute of Occupational Safety and Health.

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Validation of the Japanese version of the recovery experience questionnaire

Shimazu A., Sonnentag S., Kubota K., Kawakami N.

Journal of Occupational Health （Journal of Occupational Health） 54 （ 3 ） 196 - 205 2012年08月

研究論文（学術雑誌）, 査読有り, ISSN 13419145

Objectives: The aim of this study was to validate the Japanese version of the Recovery Experience Questionnaire (REQ-J), which assesses how individuals unwind and recuperate from work during leisure time (i.e., psychological detachment, relaxation, mastery and control). Methods: The translated and back-translated REQ was administered via the Internet to 2,520 Japanese employees from various occupations. Exploratory and confirmatory factor analyses were conducted to evaluate factorial validity. The relationship with potential predictors and consequences of recovery experiences were investigated to evaluate construct validity. Internal consistency was examined to evaluate its reliability. Results: A series of confirmatory factor analyses revealed that the hypothesized four-factor model fit the data best. Construct validity was generally supported by expected correlations of recovery experiences with possible predictors and consequences. Cronbach's alpha coefficient for each of the four subscales was sufficient (0.85-0.89). Conclusions: This study confirmed that the REQ-J is an adequate measure of recovery experiences that can be used in the Japanese context.

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社会格差と健康の心理社会的メカニズム : 仕事の要求度と資源の媒介効果の検討 (社会格差と健康 : ストレス科学の貢献)

島津明人, 窪田和巳, 高田未里

ストレス科学 : 日本ストレス学会誌（日本ストレス学会） 27 （ 1 ） 60 - 66 2012年07月

研究論文（学術雑誌）, 査読有り, ISSN 1349-4813

社会格差と健康　ストレス科学の貢献　社会格差と健康の心理社会的メカニズム　仕事の要求度と資源の媒介効果の検討

島津明人, 窪田和巳, 高田未里, 川上憲人

ストレス科学（日本ストレス学会） 27 （ 1 ） 60 - 66 2012年07月

研究論文（学術雑誌）, 査読有り, ISSN 1349-4813

本研究では,学歴と心理的ストレス反応との関連における仕事の要求度と仕事の資源の媒介効果を検討した。2,520名のさまざまな職種の労働者を対象にWEBを利用した調査を行い,2,514名のデータを解析に用いた(男性1,255名,女性1,259名:平均年齢44.4歳,SD=12.9)。仮説モデルは共分散構造分析によって検討した。分析の結果,次の3点が明らかになった:1)学歴は仕事の要求度を通じて心理的ストレス反応と正の関連を有していること,2)学歴は仕事の資源を通じて心理的ストレス反応と負の関連を有していること,3)学歴の心理的ストレス反応に対する直接効果は有意ではないこと。結果より,学歴は心理的ストレス反応に対して,直接効果ではなく間接効果を有していること,また,その間接効果においては,学歴が仕事の要求度と仕事の資源を通じて,それぞれ正および負の関連を有していることが示唆された。(著者抄録)

職場のメンタルヘルス対策における第一次予防 : 科学的根拠にもとづくセルフケアを中心に (特集メンタルヘルスの現状と対策 : 地域・職場・学校における)

島津明人

保健の科学（杏林書院） 54 （ 5 ） 315 - 319 2012年05月

研究論文（学術雑誌）, 査読有り, ISSN 0018-3342

Folate intake and depressive symptoms in Japanese workers considering SES and job stress factors: J-HOPE study.

Miyaki K, Song Y, Htun NC, Tsutsumi A, Hashimoto H, Kawakami N, Takahashi M, Shimazu A, Inoue A, Kurioka S, Shimbo T

BMC psychiatry （BMC Psychiatry） 12 33 2012年04月

研究論文（学術雑誌）, 共著, 査読有り, ISSN 1471-244X

Background: Recently socioeconomic status (SES) and job stress index received more attention to affect mental health. Folate intake has been implicated to have negative association with depression. However, few studies were published for the evidence association together with the consideration of SES and job stress factors. The current study is a part of the Japanese study of Health, Occupation and Psychosocial factors related Equity (J-HOPE study) that focused on the association of social stratification and health and our objective was to clarify the association between folate intake and depressive symptoms in Japanese general workers.Methods: Subjects were 2266 workers in a Japanese nationwide company. SES and job stress factors were assessed by self-administered questionnaire. Folate intake was estimated by a validated, brief, self-administered diet history questionnaire. Depressive symptoms were measured by Kessler's K6 questionnaire. " Individuals with depressive symptoms" was defined as K6≧9 (in K6 score of 0-24 scoring system). Multiple logistic regression and linear regression model were used to evaluate the association between folate and depressive symptoms.Results: Several SES factors (proportion of management positions, years of continuous employment, and annual household income) and folate intake were found to be significantly lower in the subjects with depressive symptom (SES factors: p < 0.001; folate intake: P = 0.001). There was an inverse, independent linear association between K6 score and folate intake after adjusting for age, sex, job stress scores (job strains, worksite supports), and SES factors (p = 0.010). The impact of folate intake on the prevalence of depressive symptom by a multiple logistic model was (ORs[95% CI]: 0.813 [0.664-0.994]; P =0.044).Conclusions: Our cross-sectional study suggested an inverse, independent relation of energy-adjusted folate intake with depression score and prevalence of depressive symptoms in Japanese workers, together with the consideration of SES and job stress factors. © 2012 Miyaki et al.; licensee BioMed Central Ltd.

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ひきこもり青年の親の困難感尺度の開発(Development of a scale of difficulties experienced by parents of children with hikikomori syndrome)

船越明子, 宮本有紀, 島津明人

三重県立看護大学紀要（三重県立看護大学研究支援委員会） 15 39 - 55 2012年03月

研究論文（学術雑誌）, 査読有り, ISSN 1343-8905

ひきこもり青年の親の直面する困難感を測定する評価尺度を開発し、その信頼性と妥当性について検討した。ひきこもりの親176名からデータを収集した。尺度の有効性を確認するために、予備的確認的因子分析を行った。基準関連妥当性を評価するために、家族の困難感尺度得点はCES-D、QOLと比較し、変数は相関係数によってひきこもり青年と関連した。3構造尺度を構築し、婚姻関係の困難(5項目)、子供との精神的な葛藤(7項目)、支援資源利用の困難(6項目)に一致した。二次構造モデルは、3因子モデルが適切であることを示すが、goodness-of-fit基準は満たしていなかった。総スコアは、WHO/QOLスコアとは有意に負の相関を、CES-Dスコアとは有意に正の相関を示した。内的整合性は十分な値であった。

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島津 明人

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