Shuhei Izawa

Biographic Data

ID7635983
NAMEShuhei Izawa
GIVEN NAMESShuhei
FAMILY NAMEIzawa
SIGNATUREIZAWA S
AFFILIATIONSNational Institute of Occupational Safety and Health
ORCID0000-0003-1399-1512
VERIFIEDYes
TOTAL WORKS10
TOTAL CITATIONS0
AUTHOR COUNT10
EDITOR COUNT0
FIRST PUBLICATION YEAR2010
LATEST PUBLICATION YEAR2026
H-INDEX0

  • Effects of irritable bowel syndrome and related cognitive-behavioral and occupational stress factors on the productivity and abdominal symptoms of Japanese workers

    Open AccessNagisa Sugaya, Shuhei Izawa et al.ARTICLEBioPsychoSocial Medicine2026

    OBJECTIVES: This longitudinal study aimed to examine the effects of irritable bowel syndrome (IBS) and related cognitive-behavioral and occupational stress factors on the productivity and abdominal symptoms of Japanese workers. METHODS: An online survey was conducted from October 5 to October 20, 2023 (Time 1), targeting workers aged 20–49 years who were not self-employed or business owners and who worked more than 30 h per week. Data from 1,062 …

  • Appealing to fear to promote self-care behaviors for stress

    Open AccessShuhei Izawa, Kosuke Yamada et al.ARTICLECurrent Psychology2024

  • Multifaceted ORganizational InterventiONs (M-Orion) project for prevention of depression and anxiety among workers

    Open AccessKazuhiro Watanabe, Hiroyuki Hikichi et al.ARTICLEBMC Public Health2024

    UMIN000050949

  • Blunted diurnal interleukin-6 rhythm is associated with amygdala emotional hyporeactivity and depression

    Open AccessYuko Hakamata, Hiroaki Hori et al.ARTICLEFrontiers in Psychiatry2023

    Here we show that the blunted interleukin-6 diurnal rhythm predicts depressive symptoms, modulated by amygdala emotional hyporeactivity and gene-stressor interactions. These findings indicate a potential mechanism underlying vulnerability to depressive disorders, suggesting their early detection, prevention, and treatment through the understanding of immune system dysregulation

  • The Joint Association of Daily Rest Periods and Sleep Duration with Worker Health and Productivity

    Open AccessHiroki Ikeda, Tomohide Kubo et al.ARTICLEInternational Journal of…2022

    A daily rest period (DRP) is a daily inter-work interval that contains sleep opportunity. This study investigates the joint association of DRP and sleep duration with worker health and productivity. A total of 13,306 Japanese daytime workers participated in this web-based cross-sectional survey. Participants reported on their DRPs and sleep duration; moreover, sleep difficulties, mental health, and presenteeism were assessed by the standardized q…

  • Shift-Work Schedule Intervention for Extending Restart Breaks after Consecutive Night Shifts

    Open AccessTomohide Kubo, Shun Matsumoto et al.ARTICLEInternational Journal of…2022

    More knowledge is required to determine the optimal shiftwork schedule to reduce the harmful effects of short restart breaks between shifts. This 5-month intervention study aimed to examine the effectiveness of extended restart breaks from 31 h to 55 h after consecutive night shifts by considering the characteristics of the circadian rhythm to mitigate fatigue and sleep among 30 shift-working nurses. Subjective and objective variables, such as vi…

  • Seasonality in mood and behaviours of Japanese residents in high-latitude regions

    Open AccessYumiko Kurata, Shuhei Izawa et al.ARTICLEBioPsychoSocial Medicine2016

    BACKGROUND: Daylight hours in high-latitude regions tend to be longer than those in Japan in summer, and shorter than those in Japan in winter. For example, daylight hours in London in winter are one-third those of Tokyo. Therefore, this study investigated and compared seasonal changes in mood and behaviours of Japanese individuals living in and outside Japan. METHODS: = 96). First, summer and winter General Health Questionnaire-28 (GHQ28) scores…

  • Effect of prolonged stress on the adrenal hormones of individuals with irritable bowel syndrome

    Open AccessNagisa Sugaya, Shuhei Izawa et al.ARTICLEBioPsychoSocial Medicine2015

    BACKGROUND: The purpose of this study was to investigate the effect of prolonged stress on the salivary adrenal hormones (cortisol, dehydroepiandrosterone [DHEA], DHEA-sulfate [DHEA-S]) of individuals with irritable bowel syndrome (IBS). METHODS: The participants were female college students, including 10 with IBS and 16 without IBS (control group), who were scheduled for a 2-week teaching practice at a kindergarten. Participants were asked to co…

  • Cynical Hostility, Anger Expression Style, and Acute Myocardial Infarction in Middle-aged Japanese Men

    Shuhei Izawa, Yumi Eto et al.ARTICLEBehavioral Medicine2011

    Studies using American and European populations have demonstrated that high levels of anger/ hostility are predictive of coronary heart disease (CHD) mortality. However, Japanese studies did not show consistent relationship between anger/hostility and CHD. This study examines the association of cynical hostility and anger expression style with acute myocardial infarction (AMI) in middle-aged Japanese men through a case-control study. The patients…

  • Effect of day-to-day variations in adrenal cortex hormone levels on abdominal symptoms

    Open AccessNagisa Sugaya, Shuhei Izawa et al.ARTICLEBioPsychoSocial Medicine2010

    INTRODUCTION: The hypothalamic-pituitary-adrenal axis is known to be related to abdominal symptoms, and the relationship between abdominal pain and cortisol secretory patterns has been previously investigated using a cross-sectional approach. Here, we investigated the effect of day-to-day variations in salivary cortisol and dehydroepiandrosterone-sulfate levels on abdominal symptoms in healthy individuals. METHODS: Eleven college students (4 male…