Hiroki Ikeda

ORCID: 0000-0001-8760-8964
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About
Contact & Profiles
Research Areas
  • Sleep and Work-Related Fatigue
  • Sleep and related disorders
  • Workplace Health and Well-being
  • Sleep and Wakefulness Research
  • Ergonomics and Musculoskeletal Disorders
  • Circadian rhythm and melatonin
  • Behavioral Health and Interventions
  • Physical Activity and Health
  • Heart Rate Variability and Autonomic Control
  • Blood Pressure and Hypertension Studies
  • Psychosomatic Disorders and Their Treatments
  • COVID-19 and Mental Health
  • Employment and Welfare Studies
  • Urban Transport and Accessibility
  • Balance, Gait, and Falls Prevention
  • Musculoskeletal pain and rehabilitation
  • Motivation and Self-Concept in Sports
  • Cardiomyopathy and Myosin Studies
  • Urban and spatial planning
  • Underground infrastructure and sustainability
  • Action Observation and Synchronization
  • Neurobiology of Language and Bilingualism
  • Advanced MRI Techniques and Applications
  • Technostress in Professional Settings
  • Fibroblast Growth Factor Research

National Institute of Occupational Safety and Health
2016-2024

Japan Organization of Occupational Health and Safety
2017-2024

Shinshu University
2024

Kobe University
2022

Japanese Red Cross Society Wakayama Medical Center
2018-2020

Kansai Medical University
2010-2020

National Center of Neurology and Psychiatry
2012-2019

National Institute of Mental Health
2014-2019

Ikeda Municipal Hospital
2018

Institute of Occupational Safety
2017

Objective: We aimed to examine the effects of daily rest period (DRP) on resting blood pressure (BP) and fatigue determine optimal DRP for daytime workers. Methods: Fifty-four employees participated in a 1-month observational study. BP was measured thrice at workplace. Employees underwent pre- post-survey usual assess subjective health outcomes. To DRP, criteria were set as 11, 12, 13, 14 hours. Results: Workers with shorter had high diastolic fatigue. Diastolic higher short group than long...

10.1097/jom.0000000000000968 article EN Journal of Occupational and Environmental Medicine 2017-04-01

Circadian typology, or "morningness" and "eveningness," is generally assessed using the Morningness-Eveningness Questionnaire (MEQ), a 19-item scale that could be burdensome in large-scale surveys. To overcome this, 5-item version known as reduced morningness-eveningness questionnaire (rMEQ), which sensitive to assessment of circadian was developed; however, validated Japanese rMEQ yet established. This study aimed develop validate rMEQ. Five essential items for were selected from existing...

10.1080/07420528.2024.2334048 article EN Chronobiology International 2024-04-01

Abstract Objectives: Several health issues are associated with irregular sleep patterns. However, it is unclear what causes workers to irregularly. The work interval (WI) between the end of one day’s working hours and start next contains opportunities, an WI may result in sleep. This study investigated this association among Japanese daytime workers. Methods: recruited 141 without shiftwork for a 14-day observational study. Participants reported duration, timing, time bed (TIB: difference...

10.1093/joccuh/uiae009 article EN cc-by Journal of Occupational Health 2024-01-01

This study aimed to describe the sleep quantity, quality, and daily rest periods (DRPs) of Japanese permanent daytime workers.Information about usual DRP, quality (Japanese version Pittsburgh Sleep Quality Index: PSQI-J) 3,867 workers in Japan was gathered through an Internet-based survey. information analyzed divided into following eight DRP groups: <10, 10, 11, 12, 13, 14, 15, ≥16 h.The durations for h groups were found be 5.3, 5.9, 6.1, 6.3, 6.5, 6.7, 6.9 h, respectively. The trend...

10.1539/joh.17-0165-oa article EN cc-by-nc-sa Journal of Occupational Health 2017-12-27

Multisensory integration is a key factor in establishing bodily self-consciousness and adapting humans to novel environments. The rubber hand illusion paradigm, which can immediately perceive illusory ownership an artificial hand, traditional technique for investigating multisensory the feeling of ownership. However, long-term learning properties have not been previously investigated. Moreover, although sleep contributes various aspects cognition, including memory, its influence on has yet...

10.1371/journal.pone.0085734 article EN cc-by PLoS ONE 2014-01-17

Abstract Background The European Union’s Working Time Directive stipulates recovery periods as “Eleven consecutive hour daily rest (DRPs) between working days.” In Japan, adopting this regulation has been discussed. Objective To examine the association weekday DRPs and from fatigue by conducting a one-month observational study using monitoring application (fatigue app) on smart tablet. Methods Fifty-five daytime employees at an information technology company participated in study. Visual...

10.1539/joh.2018-0073-oa article EN cc-by-nc-sa Journal of Occupational Health 2018-08-16

During the Coronavirus disease 2019 (COVID-19) pandemic, social isolation and impaired interaction could be factors that cause mental health problems. This study investigated association between conversation time in daily life among Japanese employees.In August 2021, a web-based cross-sectional survey was conducted with 1000 employees. Weekly assessed four domains (family members, friends, someone workplace, others), using version of Kessler Psychological Distress Scale (K6 scale). total...

10.1002/1348-9585.12334 article EN cc-by-nc Journal of Occupational Health 2022-01-01

A daily rest period (DRP) is a inter-work interval that contains sleep opportunity. This study investigates the joint association of DRP and duration with worker health productivity. total 13,306 Japanese daytime workers participated in this web-based cross-sectional survey. Participants reported on their DRPs duration; moreover, difficulties, mental health, presenteeism were assessed by standardized questionnaires. The participants divided into 10 groups based duration. Logistic regression...

10.3390/ijerph191711143 article EN International Journal of Environmental Research and Public Health 2022-09-05

Self-awakening is the ability to awaken without external assistance at a predetermined time. Cross-sectional studies reported that people who self-awaken have sleep/wake habits different from those of use means wake sleep. However, no longitudinal study has examined self-awakening. The present investigated self- awakening, both habitual and inconsistent, compared awakening by in relation schedules for five consecutive years 362 students (starting mean age 15.1 ± 0.3 years). Students...

10.2147/nss.s33861 article EN cc-by-nc Nature and Science of Sleep 2012-09-01

Higher wake promotion against sleep drive boosts cognitive processing, but it also seems to increase the risk of insomnia by reinforcing an obsession with in neurotic patients. To explore whether a personality trait neuroticism simultaneously facilitates wake-promoting ability and devaluation via common regional prefrontal function under sleep-restricted condition, working memory tasks were administered 49 healthy humans after 2-h restriction. demonstrated high-load task was correlated lower...

10.1111/psyp.12180 article EN Psychophysiology 2014-02-20

The aim of this study was to clarify the relationship between sleep disturbances and depression in daytime workers using a structured interview. A total 1,184 were enrolled. We evaluated difficulty initiating (DIS), maintaining (DMS), early morning awakening (EMA), global insomnia scores (ISs) all participants. As result, prevalences DIS, DMS, EMA 16%, 46%, 22 %, respectively. IS significantly correlated with score. Additionally, although subscales (i.e., EMA) associated score, main factor...

10.2486/indhealth.2017-0055 article EN Industrial Health 2017-01-01

This study aimed to examine hemodynamic responses and the necessity of breaks under long working hours. Thirty-eight healthy males conducted PC-based work from 9:10 22:00. Nine 10-minute short two (a 1-hour break a 50-minute break) were provided, measured regularly during this period. The results showed that systolic blood pressure increased hours cardiovascular burden Cardiac decreased, but vascular continually periods without breaks. breaks, however, benefitted workers by preventing...

10.1038/s41598-018-32908-y article EN cc-by Scientific Reports 2018-09-24

This observational study aimed to determine how 1-year changes in work time control (WTC) have an impact upon objectively measured fatigue and sleep among employees.Thirty-nine employees were divided into two groups according whether or not their WTC increased from baseline 1 year later. Psychomotor vigilance task (PVT) wrist actigraphy used measure sleep, respectively. Self-reported outcomes also measured.The group showed gradual improvements PVT performance quality over the course of...

10.1097/jom.0000000000000858 article EN Journal of Occupational and Environmental Medicine 2016-09-07

Abstract Purpose We aimed to cross-sectionally investigate how work and sleep conditions could be associated with excessive fatigue symptoms as an early sign of Karoshi (overwork-related cerebrovascular cardiovascular diseases; CCVDs). Methods distributed a questionnaire regarding work, sleep, 5410 truck drivers, the riskiest occupation for overwork-related CCVDs, collected 1992 total samples (response rate: 36.8%). The research team 1564 investigation reports required compensation Karoshi....

10.1007/s00420-021-01655-5 article EN cc-by International Archives of Occupational and Environmental Health 2021-02-01

Summary The daily rest period (DRP) is the inter‐work interval and can include a sleep opportunity, leisure time, other non‐work time. A longer DRP may allow workers to increase time in bed (TIB) adjust timing, that reduce problems such as short duration, debt, social jetlag, poor quality. present study examined longitudinal association between these among Japanese daytime workers. DRP, TIB on workdays, quality (Pittsburgh Sleep Quality Index [PSQI]), debt jetlag were measured November 2016...

10.1111/jsr.13449 article EN cc-by Journal of Sleep Research 2021-07-26

Abstract Objective A sufficient duration of time off after work is necessary to ensure workers’ health. Better quality off-job can also facilitate recovery from fatigue, but its quantitative influence largely unknown. We aimed examine how (as measured by the frequency emailing work), and associated with psychological detachment, actigraphic sleep, saliva cortisol using a 1-month observational study. Methods The participants were 58 daytime employees working at an information technology...

10.1002/1348-9585.12300 article EN cc-by Journal of Occupational Health 2021-01-01

The cognitive ability to self-monitor one’s current performance is important for hospital nurses maintain safety and health. However, studies on the effects of rotating shift work self-monitoring are insufficient. We examined differences in accuracy across shifts a three-shift system among 30 female ward (mean age 28.2 years). Their was calculated by subtracting predicted reaction times psychomotor vigilance task performed just before exiting workplace from actual times. A mixed-effect model...

10.1080/07420528.2023.2193270 article EN cc-by-nc-nd Chronobiology International 2023-03-27

We investigated completion phenomenon for proverbs in cases demonstrating transcortical sensory aphasia due to a variety of diseases. Lack this was exclusively observed patients with focal atrophy. These showed selective and consistent impairment word comprehension without phonemic cue effects naming. The present other cerebral In these patients, deficits were not words, or words comprehended inconsistent some observed. previous study, we reported that phenomena multiplication tables, serial...

10.3233/ben-1993-6304 article EN DOAJ (DOAJ: Directory of Open Access Journals) 1993-01-01

More knowledge is required to determine the optimal shiftwork schedule reduce harmful effects of short restart breaks between shifts. This 5-month intervention study aimed examine effectiveness extended from 31 h 55 after consecutive night shifts by considering characteristics circadian rhythm mitigate fatigue and sleep among 30 shift-working nurses. Subjective objective variables, such as vital exhaustion, distress, hair cortisol, salivary C-reactive protein, mattress sensor sensation, were...

10.3390/ijerph192215042 article EN International Journal of Environmental Research and Public Health 2022-11-15

Objectives The present study examined hemodynamic responses of normotensive and untreated hypertensive participants under simulated long working hours (LWH) – 13 in an experimental laboratory study. Methods Thirty-five men participated this Twenty-two these were categorized into the group (systolic blood pressure (SBP) ≤140 mmHg diastolic (DBP) ≤90 mmHg); one participant was excluded due to missing data, leaving twenty-one with a mean age 49.2 years. Another thirteen high (SBP=140–160 or...

10.5271/sjweh.3752 article EN Scandinavian Journal of Work Environment & Health 2018-07-08

Mental health problems are prevalent among the working population and must be resolved. We conducted a web-based large-scale study of workers, including baseline survey two follow-up surveys, to investigate associations between self-care behaviors in daily life (e.g., stress coping, sleep, diet, exercise), work environment improvements, mental Japanese employees from various industries. In this protocol, we demonstrate design demographic data participants survey. Invitations participate were...

10.2486/indhealth.2023-0068 article EN Industrial Health 2023-09-14

This study aimed to clarify haemodynamic responses of different age groups simulated long working hours.Men three participated in this (16 their 30s (mean 33.9±2.7 years old), 15 40s (45.5±2.9) and 16 50s (54.1±2.7)). All participants conducted 12 45-min personal computer-based tasks from 09:00 22:00. Nine 10-min 15-min breaks between task periods, a 1-hour break at noon, 50-min the evening were provided. Haemodynamic measured during periods. had normal resting systolic blood pressure (SBP...

10.1136/oemed-2019-105915 article EN Occupational and Environmental Medicine 2019-07-24
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