Long working hours and risk for hypertension in Japanese male white collarworkers

Citation
N. Nakanishi et al., Long working hours and risk for hypertension in Japanese male white collarworkers, J EPIDEM C, 55(5), 2001, pp. 316-322
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Envirnomentale Medicine & Public Health","Medical Research General Topics
Journal title
JOURNAL OF EPIDEMIOLOGY AND COMMUNITY HEALTH
ISSN journal
0143-005X → ACNP
Volume
55
Issue
5
Year of publication
2001
Pages
316 - 322
Database
ISI
SICI code
0143-005X(200105)55:5<316:LWHARF>2.0.ZU;2-4
Abstract
Study objective-To evaluate the association of long working hours with the risk for hypertension. Design-A five year prospective cohort study. Setting-Work site in Osaka, Japan. Participants-941 hypertension free Japanese male white collar workers aged 35-54 years were prospectively examined by serial annual health examination s. Men in whom borderline hypertension and hypertension were found during r epeated surveys were defined as incidental cases of borderline hypertension and hypertension. Main results-336 and 88 men developed hypertension above the borderline lev el and definite hypertension during the 3940 and 4531 person years, respect ively. After controlling for potential predictors of hypertension, the rela tive risk for hypertension above the borderline level, compared with those who worked < 8.0 hours per day, was 0.63 (95% confidence intervals (CI): 0. 43, 0.91) for those who worked 10.0-10.9 hours per day and 0.48 (95% CI: 0. 31, 0.74) for those who worked <greater than or equal to> 11.0 hours per da y. The relative risk for definite hypertension, compared with those who wor ked < 8.0 hours per day, was 0.33 (95% CI: 0.11, 0.95) for those who worked <greater than or equal to> 11.0 hours per day. The multi-variate adjusted slopes of diastolic blood pressure (DBP) and mean arterial blood pressure ( MABP) during five years of follow up decreased as working hours per day inc reased. From the multiple regression analyses, working hours per day remain ed as an independent negative factor for the slopes of systolic blood press ure, DBP, and MABP. Conclusions-These results indicate that long working hours are negatively a ssociated with the risk for hypertension in Japanese male white collar work ers.