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Open Access Highly Accessed Research article

Occupational heavy lifting and risk of ischemic heart disease and all-cause mortality

Christina B Petersen1, Louise Eriksen1, Janne S Tolstrup1, Karen Søgaard2, Morten Grønbæk1 and Andreas Holtermann3*

Author affiliations

1 National Institute of Public Health, University of Southern Denmark, Øster Farimagsgade 5A, 1353, Copenhagen, Denmark

2 Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark

3 National Research Centre for the Working Environment (NFA), Lersø Parkallé 105, 2100, Copenhagen, Denmark

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Citation and License

BMC Public Health 2012, 12:1070  doi:10.1186/1471-2458-12-1070

Published: 11 December 2012

Abstract

Background

Occupational heavy lifting is known to impose a high cardiovascular strain, but the risk of ischemic heart disease (IHD) from occupational heavy lifting is unknown. The objective was to investigate the association between occupational heavy lifting and risk of IHD and all-cause mortality, and the influence of occupational and leisure time physical activity on this association.

Methods

Data were analyzed from 1987, 1994, and 2000 from the Danish National Health Interview Surveys providing a sample of 6,692 working men and 5,921 working women aged 16–85 years without cardiovascular disease at baseline. Conventional risk factors for the outcomes IHD and all-cause mortality were controlled for in Cox analyses.

Results

Among men, heavy lifting was associated with increased risk for IHD (hazard ratio (HR): 1.52, 95% Confidence interval (95% CI): 1.15, 2.02), while a decreased risk was associated with occupational (HR: 0.50, 95% CI: 0.37, 0.68) and leisure time (HR: 0.73, 95% CI: 0.56, 0.95) physical activity. Referencing men with high occupational physical activity and no heavy lifting, men with high occupational physical activity and heavy lifting did not have an increased risk (HR: 1.11, 95% CI:0.68, 1.82), while men with low occupational physical activity and heavy lifting had a substantial increased risk (HR: 2.56, 95% CI:1.52, 4.32). No significant associations were found for all-cause mortality or for females.

Conclusion

These findings indicate an excessive risk for IHD from occupational heavy lifting among men, particularly among those with low occupational and leisure time physical activity.