Does occupational physical activity (being a conductor) reduce the incidence of coronary heart disease compared to sedentary work (being a driver) in London busmen?
This classic epidemiological study demonstrates that occupational physical activity is associated with a lower incidence of coronary heart disease and sudden death compared to sedentary work.
The incidence of coronary heart disease (CHD) is less in the middle-aged conductors of London's double-decker buses than in the drivers of the same age.In particular, the "sudden death" rate of con- ductors under 50 is one-third that of drivers (Morris, Heady, Raffle, Roberts, and Parks, 1953; Morris and Raffle, 1954).By using information on sizes of uni- forms, Morris, Heady, and Raffle (1956) showed also that the girth of conductors was less than that of drivers in each 5-year age group from 25-29 to 60-64.This paper brings the evidence up to date and presents new information.Data about the rate of occurrence of all first clinical attacks in the two
Heady et al. (Sun,) studied this question.
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