Coronary Heart-Disease and Physical Activity of Work

The relationship of lipaemia to thrombosis and atheroma

“…(3) The incidence of coronary atherosclerosis is less in subjects with occupations entailing considerable physical exertion than in those with sedentary occupations, irrespective of the social group (Morris, Heady, Raffle, Roberts & Parks, 1953).…”

Exercise and Lipid Abnormalities

“…With follow-up of cardiovascular outcomes in the busmen, the conductors had a lower death rate than the drivers at each age. The age standardized rate was 1.9 per 1000 per year for conductors and 2.7 per 1000 per year for drivers [28]. However, it was noted subsequently that the waist size of the drivers' uniforms was substantially greater than that of the conductors.…”

“…One of the earliest studies was the London Busmen Study [28]. Morris et al noted that there was distinct dichotomy in the level of activity between the drivers of the busses who sat all day and the conductors who collected the fares, had to actively move about the bus, and go up and down stairs on the double-decker buses.…”

Habitual Physical Activity and Myocardial Infarction

“…However, serum cholesterol, which in general is the best predictor of future development of the disease, was the only variable with similar levels in all the occupational groups. Other authors involved in similar studies have faced this unexpected finding [16,17,22]. Probably only a long-term follow-up of this group, or of similar larger groups, can solve this complex problem.…”

“…Whereas theoretical considerations and some epidemiological and patho logical reports suggest that a high level of physical activity protects against the development of MI, and that sedentarity makes men more prone to it [2,3,4,14,20,21,22,24,29,311, one also finds reports with indifferent or opposite conclusions [5,10,11,15,18,27,28,30).…”