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Journal of Occupational Health

Toshiaki Sasaki, Masumi Asakura, Chigusa Ishioka, Tatsuya Kasai, Taku Katagiri, Shoji Fukushima
OBJECTIVES: IARC has classified one type of multi-walled carbon nanotubes (MWCNTs), MWNT-7, as possibly carcinogenic to humans (Group 2B); however, other types of MWCNT were categorized as not classifiable as to their carcinogenicity to humans (Group 3). In vitro chromosomal aberration assays of MWNT-7 showed polyploid formation but not structural abnormalities. This study investigated the influence of the shape and size of MWCNT on in vitro induction of chromosomal aberrations. METHODS: Microscopic analysis and viable cell counting were used to assay for chromosomal aberrations and cytotoxicity induced in a Chinese hamster lung cell line (CHL/IU) exposed to different MWCNTs...
October 7, 2016: Journal of Occupational Health
Yumiko Maekawa, Juan Ramos-Cejudo, Atsuko Kanai
OBJECTIVES: Although using mental health services is an effective way to cope with work-related stressors and diseases, many employees do not utilize these services despite their improvements in recent years. The present study aimed to investigate the interaction effects of workplace climate and distress on help-seeking attitudes, and elucidate the reasons for mental health service underutilization in Japan. METHODS: A questionnaire was distributed to 650 full-time male Japanese employees...
October 7, 2016: Journal of Occupational Health
Rajesha K Nairy, Narayana Yerol, Nagesh N Bhat, Utkarsha Desai, Kapil Shirsath, Usha Yadav, Rajesh K Chaurasia, Sapra B K
OBJECTIVE: In the present study an attempt was made to estimate coefficients of dose response curves for PCC aberrations induced by CalyculinA and Okadaic acid, using(60)Co gamma radiation and 8 MeV pulsed electron beam for biodosimetry application. MATERIALS AND METHODS: The modified method outlined by Puig et al. 2013 was used to conduct Calyculin A and Okadaic acid induced PCC assay in human blood lymphocytes.Chemical treatment was given for the last 1 h of a 48 h culture...
October 7, 2016: Journal of Occupational Health
Norio Sugawara, Manabu Saito, Kazuhiko Nakamura
Since December 1, 2015, the Japanese government has required employers to conduct the Stress Check Program. The Ministry of Health, Labour and Welfare announced that this program should focus on the primary prevention of mental health problems. Although employers are obliged to perform screening for mental health problems and a physician's interview, employees are not mandated to participate in this program. Classical occupational health studies have accumulated evidence indicating that quantitative or qualitative workload is associated with mental health problems...
September 30, 2016: Journal of Occupational Health
Jun Ojima
OBJECTIVES: The International Agency for Research on Cancer (IARC) and Japan Society for Occupational Health (JSOH) classified wood dust as a human carcinogen. Former studies have suggested that sanding with a portable sander is one of the processes that are liable to cause highest exposure to wood dust. However, the wood dust by sanding operation has not been investigated sufficiently. In this study, the generation rate and the particle size distribution of the wood dust produced by handheld sanding operation were observed by laboratory experiments...
September 30, 2016: Journal of Occupational Health
Takami Okada, Akira Ogami, Byeong Woo Lee, Chikara Kadoya, Takako Oyabu, Toshihiko Myojo
OBJECTIVE: Titanium dioxide nanoparticles are widely used as UV filters in cosmetics and as a photocatalyst. We evaluated pulmonary responses to different crystal forms of TiO2 nanoparticles. METHODS: We used 4 different TiO2 samples with similar specific surface areas (anatase, rutile, amorphous, and P25). Each sample was suspended in distilled water and intratracheally instilled to male Wister rats at the dose of 1 mg per rat. Five rats per group were sacrificed at 3 days, 1 month, and 6 months after instillation, and bronchoalveolar lavage fluid was collected from the right lung to determine the total cell count and polymorphonuclear cell (PMN) counts...
September 30, 2016: Journal of Occupational Health
Tagayasu Tanaka, Ryoichi Inaba, Atsuhito Aoyama
OBJECTIVES: This study investigated the actual situation of noise and low-frequency sounds in firework events and their impact on pyrotechnicians. METHODS: Data on firework noise and low-frequency sounds were obtained at a point located approximately 100 m away from the launch site of a firework display held in "A" City in 2013. We obtained the data by continuously measuring and analyzing the equivalent continuous sound level (Leq) and the one-third octave band of the noise and low-frequency sounds emanating from the major firework detonations, and predicted sound levels at the original launch site...
September 30, 2016: Journal of Occupational Health
Ayako Hino, Akiomi Inoue, Kosuke Mafune, Toru Nakagawa, Takeshi Hayashi, Hisanori Hiro
OBJECTIVE: This study investigated the impact of changes in psychosocial work characteristics on insulin resistance (IR) among Japanese male workers. METHODS: Subjects were 1,815 male workers who received a comprehensive health examination and requested measurement of their serum insulin level in Fiscal Years (FY) 2008 and 2011. Psychosocial work characteristics, including job demands, job control, and workplace social support (from supervisors and coworkers), were assessed in each of the job demands-control and demand-control-support models...
September 30, 2016: Journal of Occupational Health
Tsukimi Tsukada, Hisataka Sakakibara
OBJECTIVES: This study aimed to examine effective assessment methods of falls in the workplace. METHODS: There were 436 employees (305 males and 131 females) of electrical appliance manufacturers included in this study. In 2014, a baseline survey was conducted using the fall scores questionnaire and the self-check risk assessment of falls and other accidents in the workplace (physical function measurement and questionnaire). In 2015, the occurrence of falls in the past year was investigated...
September 30, 2016: Journal of Occupational Health
Chadayu Udom, Prawit Janwantanakul, Rotsalai Kanlayanaphotporn
OBJECTIVES: Low back pain (LBP) is one of the most prevalent musculoskeletal disorders in the general population, especially among manual laborers. Moreover, it often brings about lost wages and additional medical expenses. However, the potential risk factors for LBP are unknown. This study aimed to estimate the prevalence of LBP and to determine the individual, occupational, and psychosocial factors associated with LBP among rubber farmers. METHODS: A cross-sectional survey was conducted among 450 Thai rubber farmers using cluster random sampling...
September 30, 2016: Journal of Occupational Health
Wanhyung Lee, Kwanyoung Hong, Sung-Shil Lim, Jin-Ha Yoon
OBJECTIVES: Many aging workers wish to continue working as long as they can for a better life in the future. However, symptoms of pain are a key obstacle in the continuation of work among older workers. The impact of pain on work is understudied. Thus, we investigated the relationship between pain characteristics (total site and severity) and aging workers' working life expectancy scale (WoLES) in Korea. METHODS: We included 1,979 participants (1,175 men and 804 women) from a well-established survey of a nationally representative population: the Korean Longitudinal Study of Ageing...
September 30, 2016: Journal of Occupational Health
Yoshiko Kubo, Yoko Hatono, Tomohide Kubo, Satoko Shimamoto, Junko Nakatani, Barbara J Burgel
OBJECTIVES: This study aimed to develop the Career Anchors Scale among Occupational Health Nurses (CASOHN) and evaluate its reliability and validity. METHODS: Scale items were developed through a qualitative inductive analysis of interview data, and items were revised following an examination of content validity by experts and occupational health nurses (OHNs), resulting in a provisional scale of 41 items. A total of 745 OHNs (response rate 45.2%) affiliated with the Japan Society for Occupational Health participated in the self-administered questionnaire survey...
September 30, 2016: Journal of Occupational Health
Hironobu Abiko, Mitsuya Furuse, Tsuguo Takano
OBJECTIVES: In the use of activated carbon beds as adsorbents for various types of organic vapor in respirator gas filters, water adsorption of the bed and test gas humidity are expected to alter the accuracy in the estimation of breakthrough data. There is increasing interest in the effects of moisture on estimation methods, and this study has investigated the effects with actual breakthrough data. METHODS: We prepared several activated carbon beds preconditioned by equilibration with moisture at different relative humidities (RH = 40% - 70%) and a constant temperature of 20°C...
September 30, 2016: Journal of Occupational Health
Iman Dianat
OBJECTIVES: This study was conducted to determine the prevalence of musculoskeletal symptoms and associated risk factors among Iranian handicraft workers engaged in different hand sewing tasks. METHODS: Data were collected using questionnaires (including the Nordic Musculoskeletal Questionnaire) as well as direct observations of posture (using the Rapid Upper Limb Assessment [RULA] method) from 632 workers including carpet handicraft workers (n=222), textiles handicraft workers (n=209), and leather handicraft workers (n=201) in Tabriz, Iran...
September 30, 2016: Journal of Occupational Health
Akiomi Inoue, Norito Kawakami, Hisashi Eguchi, Akizumi Tsutsumi
OBJECTIVES: The present study aimed to examine the buffering effect of workplace social capital (WSC) on the association of job insecurity with psychological distress in Japanese employees. METHODS: 2,971 employees from two factories of a manufacturing company in Japan completed a self-administered questionnaire including the scales on job insecurity, WSC, psychological distress, demographic and occupational characteristics, and quantitative workload. Using psychological distress (defined as a total score of the K6 scale ≥5) as a dependent variable, multiple logistic regression analyses were conducted...
September 30, 2016: Journal of Occupational Health
Chenghong Han, Lihai Liu, Shiping Du, Jianhua Mei, Ling Huang, Min Chen, Yongliang Lei, Junwen Qian, Jianyong Luo, Meibian Zhang
OBJECTIVES: Occupational exposure to paraffin is an infrequent cause of lipoid pneumonia (LP) and related data are scare. We investigated the possible relationship between three rare cases of chronic LP and occupational exposure to paraffin aerosol in an iron foundry. METHODS: The three cases of LP and their workplaces were investigated using data from field investigations, air monitoring, pulmonary radiological examinations, cell staining, and lung biopsies. RESULTS: The patients had long-term occupational exposure to paraffin...
September 30, 2016: Journal of Occupational Health
Makiko Nakano, Akiyo Tanaka, Miyuki Hirata, Hiroyuki Kumazoe, Kentaro Wakamatsu, Dan Kamada, Kazuyuki Omae
OBJECTIVES: To report the occurrence of an advanced case of indium lung disease with severely progressive emphysema in an indium-exposed worker. CASE REPORT: A healthy 42-year-old male smoker was employed to primarily grind indium-tin oxide (ITO) target plates, exposing him to indium for 9 years (1998-2008). In 2004, an epidemiological study was conducted on indium-exposed workers at the factory in which he worked. The subject's serum indium concentration (In-S) was 99...
September 30, 2016: Journal of Occupational Health
Jörn Nielsen, Patrik Nilsson, Anna Dahlman-Höglund, Kerstin Kronholm Diab, Maria Albin, Monica Kåredal, Bo Jönsson, Aneta Wierzbicka, Anders Gudmundsson
OBJECTIVE: Hairdressers have an increased risk for airway symptoms especially when using hair-bleaching powder containing persulfate. To minimize exposure, dust-free bleaching powder (DFP) has been made available. We studied the effects of regular powder (RP) or DFP on the airway symptoms of hairdressers with hair-bleaching associated rhinitis. METHODS: Twelve hairdressers each performed three hair-bleachings on a wig in an exposure chamber. Half of the subjects used RP and half used DFP...
September 30, 2016: Journal of Occupational Health
Mareike Reimann
OBJECTIVES: This study investigated whether the association between perceived psychological contract breach (PCB) and employee mental health is moderated by the cognitive-motivational pattern of overcommitment (OC). Linking the psychological contract approach to the effort-reward imbalance model, this study examines PCB as an imbalance in employment relationships that acts as a psychosocial stressor in the work environment and is associated with stress reactions that in turn negatively affect mental health...
September 30, 2016: Journal of Occupational Health
Dan Han, Yue Yang, Lin Zhang, Chao Wang, Yue Wang, Wen-Qiao Tan, Xue-Ying Hu, Yong-Hui Wu
OBJECTIVE: The purpose of this study was to investigate the effects of Nickel (Ni) -smelting fumes on oncogenic proteins in vivo and in vitro. METHODS: Ni fallout beside a Ni smelting furnace in a factory was sampled to study its toxic effect. The effects of Ni-smelting fumes on the regulation of PI3K and ERK signaling pathways and the important downstream hypoxia inducible factor, HIF-1α, were studied both in NIH/3T3 cells and in the lung tissue of rats. NIH/3T3 cell transformation induced by Ni-smelting fumes was also observed...
September 30, 2016: Journal of Occupational Health
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