|Document ID (ISN)||75730|
|ISSN - Serial title
||0019-8366 - Industrial Health
|Convention or series no.
||Sasaki T., Iwasaki K., Oka T., Hisanaga N.
||Association of working hours with biological indices related to the cardiovascular system among engineers in a machinery manufacturing company
||Oct. 1999, Vol.37, No.4, p.457-463. 17 ref.
||A field survey of 278 engineers (20-59 years) in a machinery manufacturing company was conducted to investigate the association of working hours with biological indices related to the cardiovascular system (heart rate variability, blood pressure and serum levels of magnesium, dehydroepiandrosterone sulfate (DHEA-S) and cholesterol). Average working hours (defined as hours at workplace plus half of the commuting time) and sleeping hours in this study were 60.2 ▒ 6.3hr/week and 6.6 ▒ 0.8hr/day respectively. There was no significant relationship between working hours and biological indices related to the cardiovascular system, but sleeping hours had a strong negative correlation with working hours. Furthermore, the serum DHEA-S level was significantly related to sleeping hours positively. These two results indicate that long working hours might lower the serum DHEA-S level due to the reduction of sleeping hours.
||manufacturing industries; hours of work; machinery; cardiovascular system
||magnesium; Japan; hormones; cholesterol; determination in blood; work time schedules; pulse rate; arterial blood pressure; age-linked differences; sleep pattern
||D - Periodical articles
|Country / State or Province||Japan|
||Ergonomics and work organization
|Broad subject area(s)
||Hours of work