Job strain, social support in the workplace, and haemoglobin A1c in Japanese men
N Kawakamia, K Akachib, H Shimizua, T Haratanic, F Kobayashid, M Ishizakie, T Hayashif, O Fujitag, Y Aizawah, S Miyazakii, H Hiroi, S Hashimotoj, S Arakik
a Department of Public
Health, Gifu University School of Medicine, Gifu 500-8705, Japan, b Sanyo
Electric Co, Japan, c National
Institute of Industrial Health, Japan Ministry of Labour, d Department of Psychosocial Medicine,
Aichi Medical University, Japan, e Health
Care Center, Kanazawa Medical University, Japan, f Hitachi Health Care Center, Japan, g Division of Psychiatry, Kariya General
Hospital, Japan, h Department of
Hygiene and Public Health, Kitasato University School of Medicine,
Japan, i NKK Corporation, Japan, j Department of
Epidemiology and Preventive Health Sciences, School of Health Sciences
and Nursing, University of Tokyo, Japan, k Department of Public Health and Occupational
Medicine, Graduate School of Medicine
Correspondence to: Dr N Kawakami, Department of Hygiene and Preventive Medicine, Okayama University Medical School, 2-5-1 Shikata-cho, Okayama 700-8558, Japan norito{at}med.okayama-u.ac.jp
Accepted 6 July 2000
OBJECTIVES
To examine
the association between job strain (defined in the model of job demands
and job control) and social support at the workplace with levels of
glycosylated haemoglobin A1c (HbA1c)
METHODSAll male
employees aged 40-60 in a manufacturing firm, Japan, were invited to
take part in the study. A blood sample was taken from the participants
and HbA1c (%) was measured. Job strain and social support at the
workplace were assessed with the job content questionnaire (JCQ). After
excluding those who had a history of diabetes mellitus or other chronic
diseases, data from 268 male day workers were analyzed.
RESULTSAge adjusted
average concentrations of HbA1c were significantly higher in the
highest quartile group of job strain or the lowest quartile group of
social support at the workplace (p<0.05). Multiple linear regression
analysis indicated that job strain was significantly and positively
related to HbA1c (p<0.05), whereas social support at the workplace was
significantly and negatively related to HbA1c (p<0.05), both after
controlling for other covariates.
CONCLUSIONSGreater
job strain and lower social support at the workplace may be associated
with increased concentrations of HbA1c. Increased blood glucose may be
a physiological mediator between job strain or social support at the
workplace and coronary heart disease.
Keywords: job strain; social support; glycosylated haemoglobin; Japan
© 2000 by Occupational and Environmental Medicine
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