Physical activity and risk of breast cancer, colon cancer, diabetes, ischemic heart disease, and ischemic stroke events: systematic review and dose-response meta-analysis for the Global Burden of Disease Study 2013
Because of the limits of the search for studies and the natural attention beig naturally paid to the good studies mostly done in affluent countries, this review does not include older studies of the mortality of people working in very heavy manual jobs. These studies found that mortality is very high in these people, despite the self-selection of the participants.
Of course, on the one hand, the high mortality of the people involved in these jobs is explainable in part by their harsh living conditions. But, on the other hand, it would be naive to draw the line far to the right in the region of very high physical activity. The authors of this review do not do this, but it is worth remembering the harm of very hard physical activity.
Rapid Response:
On the upper end
Because of the limits of the search for studies and the natural attention beig naturally paid to the good studies mostly done in affluent countries, this review does not include older studies of the mortality of people working in very heavy manual jobs. These studies found that mortality is very high in these people, despite the self-selection of the participants.
Of course, on the one hand, the high mortality of the people involved in these jobs is explainable in part by their harsh living conditions. But, on the other hand, it would be naive to draw the line far to the right in the region of very high physical activity. The authors of this review do not do this, but it is worth remembering the harm of very hard physical activity.
Competing interests: No competing interests