Men who worked in rotation according to shifts in factories, hotels, railway companies and other types of employment with 24 hours of operating time face a higher risk for prostate cancer than those who worked in the daytime.
According to a study from research group on epidemiology of government support. "Men are 3.5 times more likely to get prostate cancer than those who work at regular hours and also 2.8 times more likely to die from cardiovascular disease, including brain attack (stroke)," the group said that sponsored by the Ministry of Health, Labour and Welfare of Japan.
The little research done in Japan to examine the influence of work schedules are not regularly on health. Recent research on the relationship between rotating shifts and risk of prostate cancer will be the first of its kind in world, says the group.
Acting as head of the research group's Akiko Tamagoshi, an assistant professor at Nagoya University who has studied the relationship between human health and social conditions.
According to the researchers, the biological clock inequalities caused irregular work schedule seems to be the main cause. "The increases in blood pressure and increased stress are also seen as a cause of cardiovascular disease," explained the group.
Risk of shift workers suffering from cardiovascular diseases are becoming increasingly high if they have other risk factors - 6.5 times greater for those with high blood pressure, 3.1 times for those who smoked, 3.6 times for those who drink beer and 6.1 times the fat man with a body mass index of more than 25.
Hour rhythm of the body creates psychological as when to sleep and body temperature. The researchers suggested that the internal clock will be disrupted if humans exposed to strong light when working in the middle of the night, thus increasing the risk of causing sleeping problems and breast cancer.
Approximately 20 percent of the firm's offices in Japan have employees who work after 22:00 o'clock, with half of them work according to shift its turn, according to a survey by the ministry.
The researchers said that the offices with the operation time of 24 hours should review their employee management system, including providing prostate cancer checks and giving special consideration to employees who have a higher risk for cardiovascular disease.
By using 1988-1999 health data on 110,000 people throughout Japan, the survey analyzed the 16 000 male workers aged between 40 to 79 years to examine the risks they face or the possibility of prostate cancer and 18 000 male workers aged between 40 to 59 years to examine the risk cardiovascular disease.
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