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Exercise has been convincingly associated with longevity and health. However, what level of exercise conveys the maximal benefit is not yet clear, and some experts postulate that there is an extreme level of intensity that may actually harm.
As part of the Copenhagen City Heart Study, 1098 joggers and 3950 nonjoggers were followed prospectively over a 12-year period. The researchers categorized jogging intensity as light (1 to 2.4 hours/week), moderate (2.5 to 4 hours/week), or strenuous (>4 hours/week). Compared with nonjoggers, joggers were younger and generally healthier (lower blood pressure and body-mass index and lower prevalence of smoking and diabetes). There were 28 deaths among joggers and 128 among nonjoggers.
Not surprisingly, jog…