Masashi Masuda

ORCID: 0000-0002-4285-5563
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About
Contact & Profiles
Research Areas
  • Occupational exposure and asthma
  • Air Quality and Health Impacts
  • Indoor Air Quality and Microbial Exposure
  • Workplace Health and Well-being
  • Occupational and environmental lung diseases
  • Cognitive Abilities and Testing
  • Employment and Welfare Studies
  • Healthcare professionals’ stress and burnout
  • Occupational Health and Safety Research
  • Cognitive Functions and Memory
  • Myasthenia Gravis and Thymoma
  • Heart Rate Variability and Autonomic Control
  • Lymphatic System and Diseases
  • Nutrition and Health in Aging
  • Nutritional Studies and Diet
  • Blood Pressure and Hypertension Studies
  • Nonmelanoma Skin Cancer Studies
  • Noise Effects and Management
  • Diagnosis and treatment of tuberculosis
  • Sex work and related issues
  • HIV/AIDS Research and Interventions
  • Tuberculosis Research and Epidemiology
  • Cytokine Signaling Pathways and Interactions
  • Pneumonia and Respiratory Infections
  • Obesity, Physical Activity, Diet

University of Occupational and Environmental Health Japan
1992-2023

ANDI
2021

National Center for Global Health and Medicine
2019

Human Resource Development Center
2018

No scoring system has ever been used to estimate the prognosis of individual tuberculosis (TB) patients.To develop and validate a prognostic score.This retrospective cohort study conducted in Japan comprised development (n = 179; mean age 65.9 ± 18.8 years) validation 244; 64.3 20.1 score among patients with newly diagnosed smear-positive non-multidrug-resistant pulmonary without human immunodeficiency virus infection. The (raw score) was defined by modifying logistic regression formula...

10.5588/ijtld.12.0476 article EN The International Journal of Tuberculosis and Lung Disease 2012-12-11

The present study aimed to estimate cumulative incidence of overweight and obesity describe 5-year longitudinal changes in body mass index (BMI) a large occupational cohort Japan.Participants were 55 229 Japanese employees, who aged 20-59 years attended at all subsequent annual health check-ups between 2009 2014. Mixed model analysis was performed examine the effects age by gender on BMI change, with as random variable. Cumulative (23.0≤ <27.5 kg/m2 ) (BMI ≥27.5 calculated. Logistic...

10.1002/1348-9585.12095 article EN cc-by Journal of Occupational Health 2019-11-02

Background: We examined the association between socioeconomic and health status, lifestyle sickness presenteeism among Japanese workers during COVID-19 epidemic. Methods: A cross-sectional study using an Internet-monitor survey was conducted in December, 2020 Japan. Of 33,302 participants, we analyzed 27,036 participants (13,814 men 13,222 women) who reported experience with presenteeism. Results: The odds ratio (OR) of associated unmarried versus married status 1.15. Respective figures for...

10.1097/jom.0000000000002415 article EN Journal of Occupational and Environmental Medicine 2021-10-14

The aim of the study is to examine relationship between toner-exposed work and health indices related respiratory disorders confirm baseline a cohort clarify effect toner exposure in manufacturing plants. Subjects were 1614 male workers (809 805 referents) who engaged plants Japan (Fuji Xerox Co., Ltd). age subjects was from 19 59 years, average 40.2 years(median 40 SD 7.67). We conducted pulmonary function test (PEFR, VC, FVC, FEV(1.0)%, V25/Ht) blood cell (RBC, Hb, Hct, Plt, WBC, contents...

10.1177/0960327109105152 article EN Human & Experimental Toxicology 2009-06-01

Abstract Objectives We aimed to explore the relationship between objective cognitive functioning and work performance among Japanese workers. Methods From February November 2019, this cross-sectional study enrolled workers aged 18–65 years from 10 companies located in a metropolitan area of Japan. emailed invitations participate employees that had agreed cooperate with study. measured question, “How would you rate your (compared optimum performance) over past 4 weeks?” Responses were made...

10.1002/1348-9585.12385 article EN cc-by-nc-nd Journal of Occupational Health 2023-01-01

In this baseline study, part of a cohort study to clarify the effect toner exposure on respiratory system, we surveyed 803 male workers and 802 referents with regard their subjective symptoms chest X-ray results. We also examined individual history, current working conditions, personal levels toner. There was significantly higher prevalence “coughing sputum” related complaints among toner-exposed in 30 40-year age groups. The group toner-exposure history showed odds ratio, by logistic...

10.1177/0960327109105160 article EN Human & Experimental Toxicology 2009-06-01

This study examines the relationship between toner-handling work and its health effects on self-reported respiratory symptoms. The subjects were 1,504 male workers in a Japanese toner photocopier manufacturing company. Personal exposure measurement, pulmonary function tests, chest X-ray examination, measurement of biomarkers, questionnaire about symptoms performed annually. discusses results. We found that group showed significantly higher prevalence breathlessness than never-toner-handling...

10.1155/2014/826757 article EN cc-by BioMed Research International 2014-01-01

Objectives: This study examines the relationship between toner exposure and its health effects in terms of biomarkers which are known to assess damages humans caused by toxic material exposure. Methods: The subjects were 1504 male workers aged below 50 2003 a Japanese photocopier manufacturing company. Personal measurements, pulmonary function tests, chest X-ray examinations, biomarker measurement, questionnaire about respiratory symptoms conducted. We will report measurement this study....

10.1177/0960327113512339 article EN Human & Experimental Toxicology 2014-07-24

This study uses pulmonary function tests and chest x-ray examinations to examine the relationship between toner-handling work its health effects.The subjects were 1504 male workers in a Japanese toner photocopier manufacturing company, age range from 19 50 years 2003. Personal exposure measurements, tests, examinations, biomarker questionnaire about respiratory symptoms conducted. The present reports results of conducted subjects, which includes cross-sectional on handling non-handling...

10.1177/0960327113520018 article EN Human & Experimental Toxicology 2014-07-16

The purpose of this study was to examine the effects toner-handling work on respiratory symptoms and diseases. We conducted a prospective cohort 1468 workers between 2003 2013. included 887 581 non-toner-handling workers, employed in one toner copier manufacturing enterprise. Toner-handling were subdivided into two groups based 8-h time-weighted average exposure concentration for each category baseline survey. compared incidence disease longitudinal changes prevalence subjective among three...

10.3390/atmos10110647 article EN cc-by Atmosphere 2019-10-25

Objectives We aimed to determine whether remote cognitive training (CT) is feasible and has the potential improve function work performance in Japanese workers. Methods From June September 2020, this intervention time series study enrolled workers aged 18–65 years from 10 companies located a metropolitan area of Japan. Cognitive tests self-administered questionnaires were completed by participants three times: at baseline, after 12 weeks CT, further following cessation. measured with...

10.3389/fpsyg.2024.1404518 article EN cc-by Frontiers in Psychology 2024-07-31

This report shows the relationship between toner exposure and respiratory effects for individuals with a longterm occupational toner-handling history, from 2004 to 2013.Authors studied 752 Japanese male workers in handling workshops. A total of 673 men who participated an annual monitoring survey were analyzed this study. The following was performed same season each year: personal measurements, biological markers, function tests, chest X-ray, chronic symptoms incidences diseases. To evaluate...

10.13075/ijomeh.1896.01285 article EN cc-by-nc International Journal of Occupational Medicine and Environmental Health 2018-12-17

Abstract Background Exposure to toner, a substance used in photocopiers and printers, has been associated with siderosilicosis other adverse effects. However, these findings are limited, there is insufficient evidence on the long-term effects of toner exposure. Using longitudinal analysis, this study aimed examine work involving exposure respiratory system over time. Methods We conducted prospective cohort Japanese copier manufacturing enterprise between 2003 2013. The included total 1468...

10.1186/s12890-020-01320-6 article EN cc-by BMC Pulmonary Medicine 2020-10-27

To examine workplace factors associated with willingness to undergo human immunodeficiency virus (HIV) testing during health checkups.This cross-sectional study used an Internet-based self-administered questionnaire obtain data from a pool of 24,287 Japanese workers. Binary and multiple logistic regression analyses evaluated the association between HIV testing. Data were adjusted for sex, age, marital status, education, history testing.We gathered information 4,143 (17.1%) respondents, whom...

10.1265/ehpm.23-00054 article EN cc-by Environmental Health and Preventive Medicine 2023-01-01

Abstract Background: Exposure to toner, a substance used in photocopiers and printers, has been associated with siderosilicosis other adverse effects. However, these findings are limited, there is insufficient evidence on the long-term effects of toner exposure. Using longitudinal analysis, this study aimed examine work involving exposure respiratory system over time. Methods: We conducted prospective cohort Japanese copier manufacturing enterprise between 2003 2013. The included total 1468...

10.21203/rs.2.24156/v1 preprint EN cc-by Research Square (Research Square) 2020-02-21

Abstract Background We examined the association between socioeconomic and health status, lifestyle sickness presenteeism among Japanese workers during COVID-19 epidemic. Methods A cross-sectional study using an Internet-monitor survey was conducted in December, 2020 Japan. Of 33,302 participants, we analyzed 27,036 participants (13,814 men 13,222 women ) who reported experience with presenteeism. Results The odds ratio ( OR of associated unmarried versus married status 1.15. Respective...

10.1101/2021.07.23.21260909 preprint EN medRxiv (Cold Spring Harbor Laboratory) 2021-07-25
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