Objectives To investigate a hypothesized positive association between employment in occupations where heavy lifting is likely to occur, and the risk of ischaemic heart disease (IHD). Material and Methods Male blue-collar workers from Denmark (N = 516 180) were monitored with respect to hospital treatment or death due to IHD, through national registers over the years 2001–2010. Poisson regression was used to estimate relative rates of IHD between “workers in occupations which, according to an expert opinion, are likely to involve heavy lifting” and “other blue-collar workers.” Prevalent cases were excluded from the analysis. Results The rate ratio was estimated at 0.97 (95% confidence interval (CI): 0.94–1.00) for deaths or hospitalizations due to IHD and 1.07 (95% CI: 0.94–1.21) for deaths due to IHD. Conclusions The results do not support the hypothesis that occupational heavy lifting is an important risk factor for IHD.
Objectives To prospectively investigate if the risk of chronic neck/shoulder pain is associated with work stress and job control, and to assess if physical exercise modifies these associations. Material and Methods The study population comprised 29 496 vocationally active women and men in the Norwegian Nord-Trøndelag Health Study (HUNT Study) without chronic pain at baseline in 1984–1986. Chronic neck/shoulder pain was assessed during a follow-up in 1995–1997. A generalized linear model (Poisson regression) was used to calculate adjusted relative risks (RRs). Results Work stress was dosedependently associated with the risk of neck/shoulder pain (p trend < 0.001 in both sexes). The women and men who perceived their work as stressful “almost all the time” had multi-adjusted RRs = 1.27 (95% confidence interval (CI): 1.1–1.47) and 1.71 (95% CI: 1.46–2), respectively, referencing those with no stressful work. Work stress interacted with sex (p < 0.001). Poor job control was not associated with the risk of neck/shoulder pain among the women (RR = 1.04, 95% CI: 0.92–1.19) nor the men (RR = 1.09, 95% CI: 0.95–1.26). Combined analyses showed an inverse dose-dependent association between hours of physical exercise/week and the risk of neck/shoulder pain in the men with no stressful work (p trend = 0.05) and among the men who perceived their work as “rarely stressful” (p trend < 0.02). This effect was not statistically significant among the women or among men with more frequent exposure to work stress. Conclusions Work stress is an independent predictor of chronic neck/shoulder pain and the effect is stronger in men than in women. Physical exercise does not substantially reduce the risk among the persons with frequent exposure to work stress.
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