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Document ID (ISN)75730
CIS number 00-1775
ISSN - Serial title 0019-8366 - Industrial Health
Year 1999
Convention or series no.
Author(s) Sasaki T., Iwasaki K., Oka T., Hisanaga N.
Title Association of working hours with biological indices related to the cardiovascular system among engineers in a machinery manufacturing company
Bibliographic information Oct. 1999, Vol.37, No.4, p.457-463. 17 ref.
Abstract 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.
Descriptors (primary) manufacturing industries; hours of work; machinery; cardiovascular system
Descriptors (secondary) magnesium; Japan; hormones; cholesterol; determination in blood; work time schedules; pulse rate; arterial blood pressure; age-linked differences; sleep pattern
Document type D - Periodical articles
Country / State or ProvinceJapan
Subject(s) Ergonomics and work organization
Broad subject area(s) Physiology, ergonomics
Browse category(ies) Hours of work
Cardiovascular diseases