Answer to Question 1
Based on their review and examination of the dose-response benefits, Warburton and his associates concurred with other authorities including the Canadian government that a minimum of 30 minutes most days of the week of moderate intensity activity is generally advisable for an optimal risk reduction, and up to 60 minutes is even better. For example, the Canadian government's physical activity public health message is that Every little bit counts, but more is even better-everyone can do it In addition, Warbuton and his colleagues note that in some cases, such as reducing cardiovascular disease risk, even one hour of brisk walking per week confers benefits.
Answer to Question 2
The use of exercise as a strategy to reduce each type of risk appears to confer benefits according to a dose-response relationship. It's not a linear relationship, but rather one in which sedentary individuals who start an exercise program show the most dramatic changes in risk reductions as they go from sedentary to minimally active; gains in dosage build from there with diminishing returns as a person's activity level reaches the maximum on the continuum.
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