Sleep-related risk of occupational injuries in Japanese small and medium-scale enterprises.

A cross-sectional study evaluated the contribution of daily sleep habits to occupational injuries. A self-administered questionnaire solicited answers about sleep, symptoms of depression, occupational injury, demographics, presence of diseases and lifestyle factors from 2,903 workers between the ages of 16-83 (mean 45) yr in small and medium-scale enterprises. Eight sleep habits were queried and dichotomized: 1) less or more than 6 hr of daily sleep, 2) taking more or less than 30 min to fall asleep (Difficulty initiating sleep; DIS), 3) awakening during sleep more or less than 3 times/wk (Difficulty maintaining sleep; DMS), 4) early morning awakening more or less than 3 times/wk (EMA), 5) definitely/somewhat difficulty waking up or not, 6) sleeping very poorly/not so well at night or not, 7) definitely/somewhat insufficient nightly sleep or not, and 8) difficulty in breathing during sleep more than once/week or less.

Electron microscopic study of subcapsular cell hyperplasia in the adrenal glands of IQI/Jic mice.

Hyperplastic cells in subcapsular cell hyperplasia (SCH) lesion in adrenal glands of female IQI/Jic mice were examined by electron microscopy. These cells were small and polygonal, and had irregular nuclei, elongated mitochondria with lamellar cristae and dense lipid droplets. While these cells showed different features, some of them had desmosomes and basement membranes, and a few round mitochondria with tubular cristae as endocrine cells.

Temperature rises in the crystalline lens from focal irradiation.

Many types of ophthalmic instruments produce a concentrated focal irradiance in the lens. Instruments that illuminate large areas of the retina-known as "Maxwellian-view," are but one example, and there are concerns about the potential hazards associated with this optical system. The transfer of the heat generated in the human eye in Maxwellian-view illumination or similar focal-beam situations was simulated using a mathematical model to determine the temperature elevations induced in the human eye.

[Survey on visual and musculoskeletal symptoms in VDT workers].

With the spread of visual display terminals (VDT) in offices, the numbers of workers using VDT and the working hours at such equipment have increased rapidly in recent years. Also, preventive measures for fatigue have been proposed and the office-working environment has been improved. To examine the effects of the rapid changes in working conditions and environment on the health of VDT workers, we conducted a questionnaire survey in 2002.

Association of sickness absence with poor sleep and depressive symptoms in shift workers.

A cross-sectional study was conducted to evaluate the contribution of daily sleep habits and depressive symptoms to sickness absences of shift workers. A self-administered questionnaire that solicited answers about sleep, symptoms of depression, sickness absence, diseases/injuries, and lifestyle factors was submitted to a sample of 522 rotating shift workers between the ages of 18-59 (mean 27) yrs of an electric equipment manufacturing company. The seven features of sleep queried were daily hours of sleep, time to fall asleep, awakening during sleep, early morning awakening, sleep well at night, sufficiency of sleep, and excessive daytime sleepiness at work.

The historical development of occupational health in Australia: Part I 1788-1970.

In 1788 the British Empire established a penal colony in Sydney Cove. By virtue of their unique demographic, the earliest occupations consisted predominately of convict or prison guard. Initial health hazards included disease, traumatic injury and punishment.

Musculoskeletal disorders among professional nurses in mainland China.

Although musculoskeletal disorders represent a significant occupational issue for professional nurses worldwide, few epidemiological studies have been conducted in mainland China. Therefore, we investigated 180 nurses (84.1 percent response rate) from a teaching hospital in Shijiazhuang, Hebei Province, using a previously validated, self-reporting musculoskeletal disorder survey.

Hand dermatitis among nurses in a newly developing region of Mainland China.

Although hand dermatitis (HD) is a common occupational problem for nurses worldwide; few, if any, epidemiological studies of this disease have been conducted in Mainland China. Therefore, we administered a previously validated questionnaire to 306 nurses from a large teaching hospital in Shijiazhuang city, Hebei province. A total of 282 replies were received (92.

Musculoskeletal complaints and psychosocial risk factors among Chinese hospital nurses.

Background: Musculoskeletal complaints represent a common occupational problem for health care workers throughout the world. Despite their sizeable numbers, however, few epidemiological studies have investigated musculoskeletal complaints among Chinese hospital nurses. Objective To assess the prevalence of, and risk factors for, musculoskeletal complaints among hospital nurses in mainland China.

Health effects of exposure to ethylene glycol monoethyl ether in female workers.

Ethylene glycol monoethyl ether (EGEE) is a solvent commonly used in industry. To find the health effect of the solvent exposure in women, we did an investigation on 32 female workers exposed to EGEE in factories manufacturing photopolymer sensitization plate, and 20 subjects working in the same companies without potential exposure to the solvent. The mean age was 35.

A study on the effect of lead on event-related potentials among lead-exposed workers.

Objectives: In order to clarify the effect of lead on higher cerebral functions, lead-exposed workers (Pb group) and controls were examined for event-related potentials.

Subjects And Methods: Fourteen lead-exposed workers with a mean age of 57.1 yr (SD=4.

Effects of static load on the weight and protein content in the leg muscles of the mouse: a simulation of prolonged standing in the workplace.

To simulate the effects of prolonged standing in the workplace on the leg muscles, we subjected mice to centrifugation for 6 wk. The absolute wet weight of leg muscles and internal organs of mice were measured after exposure to 3G by centrifugation for 6 wk and at 2 wk after removal of centrifugation. The weight of the soleus muscle (antigravity muscle) significantly increased after 6-wk exposure to centrifugation, but it decreased to its control weight 2 wk after removal of centrifugation.

Diesel exhaust particles in the work environment and their analysis.

Diesel engines are widely used in industries, for example transportation, mining, and construction, because they efficiently produce high power. In diesel exhaust particles (DEP), the number of ultrafine particles, less than around 100 nm, is dominant in contrast to mass size distribution. Carcinogenic PAHs may be adsorbed on DEP at high concentrations.

Ultraviolet irradiation increases the sensitivity of cultured human skin cells to cadmium probably through the inhibition of metallothionein gene expression.

We previously developed an apparatus that can irradiate cultured cells with monochromatic ultraviolet (UV) rays to exactly assess the biological effects of UV components on mammalian cells. Using this device, we studied the effects of UV in and near the UVB region on the general as well as specific protein synthesis of the human skin-derived NB1RGB cells. We found that Cd-induced synthesis of metallothioneins (MTs), which are the proteins involved in the protection against heavy metals and oxidative stress, is inhibited by UV at 280 nm more extensively than total protein synthesis.

Brain microdialysis study of the effects of hazardous chemicals on the central nervous system 2. Toluene exposure and cerebral acetylcholine.

The microdialysis technique was applied to detect the changes in the activity of acetylcholine (ACh) neurons in the rat brain. The effects of intraperitoneal (i.p.

Job stress, social support, and prevalence of insomnia in a population of Japanese daytime workers.

To clarify the relationship between perceived job stress, social support and prevalence of insomnia in Japanese daytime workers, 1161 male white-collar employees of an electric equipment manufacturing company (age, 23-60 years, mean age of 37.0) were surveyed by means of a mailed questionnaire. Perceived job stress was evaluated with the Japanese version of the generic NIOSH job stress questionnaire.

Work environment and hand dermatitis among nurses in a Chinese teaching hospital.

Objective: The aim of this study was to investigate the effects of the working environment on hand dermatitis (HD) prevalence among nurses in a Chinese teaching hospital.

Methods: We utilised a previously validated, self-reporting survey which was translated into Chinese.

Results: The prevalence of HD among nurses was 18.

Post-lunch nap as a worksite intervention to promote alertness on the job.

A worksite study was conducted to examine whether a 15-min nap during a post-lunch rest period would affect subsequent alertness, performance, and nocturnal sleep in eight factory workers under a 3-week protocol. Subjects were asked to take the nap at 12:30 h on a reclining chair during the nap week, and to remain awake during the no-nap week. The order of these 2 weeks was counterbalanced between the subjects.

Hand dermatitis among female nursing students in tropical Australia.

Although hand dermatitis is known to affect nursing students worldwide, the prevalence among their Australian counterparts has not been elucidated and the relative contribution of tropical environments is unclear. Therefore, we conducted the first investigation of hand dermatitis among 232 female, undergraduate nurses in tropical Australia using a previously validated methodology. Hand dermatitis prevalence rose from 10.

Development of action checkpoints for comfortable computer work.

We developed a manual including a checklist format for undertaking measures to prevent fatigue in visual display terminals (VDT) workers. With this manual, problems related to VDT work can be recognized by using checklists which allow for self-evaluation by the workers. The manual helps the workers to consider measures for improvement by themselves and will contribute to better occupational health education.

Quantitative analysis of tridymite and cristobalite crystallized in rice husk ash by heating.

The quantities of two forms of crystalline silica, tridymite and cristobalite, in heated rice husk ash (RHA) samples were determined by X-ray diffraction (XRD) and chemical methods. Two RHA samples, containing 93% SiO2 and 2-3% K2O, were prepared from charcoaled rice husk products and heated to above 900 degrees C. The crystalline silica made up over 60-80% of the total silica in the heated RHA samples based on the XRD analysis.

Comparative investigation of several sperm analysis methods for evaluation of spermatotoxicity of industrial chemical: 2-bromopropane as an example.

Reproductive toxicity of 2-bromopropane (2BP), a substitute for ozone layer-depleting chloro-fluorocarbon, was found among the workers in an electronics factory in Korea in 1995. Furthermore the importance of testicular toxicity has been realized since the problem of endocrine disruptors arose all over the world, but manual methods must rely on subjective assessment. Recently, computer-assisted sperm analysis (CASA) was proposed but this system requires vast investment.

Medial plantar nerve conduction velocities among patients with vibration syndrome due to rock-drill work.

Objective: The present study was aimed at clarifying the effect of vibration syndrome (VS) on the peripheral nervous system in the lower extremities of patients with VS due to rock-drill work.

Methods: Fifty-three patients with VS due to previous exposure to vibration from rock-drilling work and 55 age-matched controls were examined for sensory nerve conduction velocities in the medial plantar nerve (SCV-P). The patient group was divided into three subgroups, outdoor rock-drill workers with vibration-induced white finger (VWF) (N = 10), tunnel workers with VWF (N = 27) and tunnel workers without VWF (N = 16).