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Epidemiol Health > Volume 44; 2022 > Article
Epidemiology and Health 2022;44: e2022073-0.
DOI: https://doi.org/10.4178/epih.e2022073    Published online Sep 7, 2022.
The associations of job strain and leisure-time physical activity with the risk of hypertension: the population-based Midlife in the United States cohort study
Xinyue Liu1  , Timothy A. Matthews2  , Liwei Chen1  , Jian Li2,3 
1Department of Epidemiology, Fielding School of Public Health, University of California Los Angeles, Los Angeles, CA, USA
2Department of Environmental Health Sciences, Fielding School of Public Health, University of California Los Angeles, Los Angeles, CA, USA
3School of Nursing, University of California Los Angeles, Los Angeles, CA, USA
Correspondence  Jian Li ,Email: jianli2019@ucla.edu
Received: Jul 13, 2022  Accepted after revision: Sep 7, 2022
Abstract
OBJECTIVES:
Job strain is positively associated with incident hypertension, while increasing leisure-time physical activity (LTPA) can reduce incident hypertension. However, the joint associations of job strain and LTPA with incident hypertension among United States workers have yet to be investigated. This study examined the independent and joint associations of job strain and LTPA with incident hypertension.
METHODS:
This prospective cohort study (n=1,160) utilized data from the population-based Midlife in the United States study. The associations of job strain and LTPA at baseline with incident hypertension during follow-up were examined using Cox proportional hazards models. High job strain was derived from a combination of high job demands and low job control, and high LTPA was defined as engagement in moderate or vigorous LTPA at least once per week.
RESULTS:
During 9,218 person-years of follow-up, the hypertension incidence rate was 30.6 (95% confidence interval [CI], 27.3 to 34.3) per 1,000 person-years. High job strain was associated with a higher risk for hypertension than low job strain (adjusted hazard ratio [aHR], 1.29; 95% CI, 1.00 to 1.67). High LTPA was associated with lower hypertension risk than low LTPA (aHR, 0.77; 95% CI, 0.60 to 0.98). Hypertension risk was higher among workers with high job strain and low LTPA than among those with low job strain and high LTPA (aHR, 1.70; 95% CI, 1.18 to 2.43).
CONCLUSIONS:
Job strain and LTPA showed positive and inverse associations, respectively, with incident hypertension. The combination of high job strain and low LTPA was associated with the highest risk for hypertension.
Keywords: Exercise, Hypertension, Job strain, Occupational stress, Physical activity
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