ILO Home
Go to the home page
Site map | Contact us Français | Español

CISDOC database

Document ID (ISN)112405
CIS number 12-0163
ISSN - Serial title 0355-3140 - Scandinavian Journal of Work, Environment and Health
Year 2011
Convention or series no.
Author(s) Hamazaki Y., Morikawa Y., Nakamura K., Sakurai M., Miura K., Ishizaki M., Kido T., Naruse Y., Suwazono Y., Nakagawa H.
Title The effects of sleep duration on the incidence of cardiovascular events among middle-aged male workers in Japan
Bibliographic information Sep. 2011, Vol.37, No.5, p.411-417. 30 ref.
Internet access The_effects_of_sleep_duration_[INTERNET_FREE_ACCESS] [in English]
Abstract This survey was conducted to investigate the relationship between sleep duration and cardiovascular events among male workers, accounting for occupational factors that might confound the true relationship. A total of 2282 male employees of a metalworking factory in Japan aged 35-54 years were followed for 14 years. The risk of cardiovascular events was compared among 4 groups stratified based on sleep duration at baseline. Cardiovascular events included stroke, coronary events and sudden cardiac death. The hazard ratios for events were calculated using a Cox proportional hazards model, with the 7-7.9-hour group serving as a reference. The model was adjusted for potential confounders including traditional cardiovascular risk factors and working characteristics. During 14 years of follow-up, 64 cardiovascular events were recorded including 30 strokes, 27 coronary events and 7 sudden cardiac deaths. After adjustment for possible confounders, the hazard ratios for cardiovascular and coronary events in the <6-hour group were 3.49 and 4.95, respectively. There was no significant increment in the risk of stroke for any sleep duration groups.
Descriptors (primary) cardiovascular diseases; sleep deprivation; male workers; older workers; risk factors
Descriptors (secondary) Japan; cross-sectional study; statistical evaluation; metalworking industry
Document type D - Periodical articles
Subject(s) Occupational physiology
Occupational pathology
Metal production and metalworking
Broad subject area(s) Occupational medicine, epidemiology
Physiology, ergonomics
Browse category(ies) Cardiovascular diseases
Older workers