In a Medline-search I found the following letter:
Exercise intensity and longevity in men
Pahor and Carbonin
JAMA 1995; 274(14): 1132-33
Perhaps they came up with some interesting views. I didn't read it
myself yet.
Greetings,
Bas Heijmans
Gaubius Laboratory, TNO-Prevention and Health, Department of Vascular
and Connective Tissue Research, The Netherlands