Physical demands at work, physical fitness, and 30-year ischaemic heart disease and all-cause mortality in the Copenhagen male study

Andreas Holtermann*, Ole Steen Mortensen, Hermann Burr, Karen Søgaard, Finn Gyntelberg, Poul Suadicani

*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

Abstract

Objective: No previous long-term prospective studies have examined if workers with low cardiorespiratory fitness have an increased risk of cardiovascular mortality due to high physical work demands. We tested this hypothesis. Method: We carried out a 30-year follow-up of the Copenhagen Male Study of 5249 employed men aged 40-59 years. We excluded from follow-up 274 men with a history of myocardial infarction, prevalent symptoms of angina pectoris, or intermittent claudication. We estimated physical fitness [maximal oxygen consumption (VO2Max)] using the Åstrand cycling test and determined physical work demands with two self-reported questions. Results: In the Copenhagen Male Study, 587 men (11.9%) died due to ischaemic heart disease (IHD). Using men with low physical work demands as the reference group, Cox analyses - adjusted for age, blood pressure, smoking, alcohol consumption, body mass index, diabetes, and hypertension - showed that high physical work demands were associated with an increased risk of IHD mortality in the least fit [VO2Max range 15-26, N=892, hazard ratio (HR) 2.04, 95% confidence interval (95% CI) 1.20-3.49] and moderately fit (VO2Max range 27-38, N=3037, HR 1.75, 95% CI 1.24-2.46), but not among the most fit men (VO 2Max range 39-78, N=1014, HR 1.08, 95% CI 0.52-2.17). We found a similar, although slightly weaker, relationship with respect to all-cause mortality. Conclusions: The hypothesis was supported. Men with low and medium physical fitness have an increased risk of cardiovascular and all-cause mortality if exposed to high physical work demands. Ours observations suggest that, among men with high physical work demands, being physically fit protects against adverse cardiovascular effects.

OriginalsprogEngelsk
Sider (fra-til)357-365
Antal sider9
TidsskriftScandinavian Journal of Work, Environment and Health
Vol/bind36
Udgave nummer5
DOI
StatusUdgivet - sep. 2010

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