June 2009 references and further reading
Defining a moderate-intensity workout
Marhsall SJ, Levy SS, Tudor-Locke CE, et al. Translating physical activity recommendations into a pedometer-based step goal. American Journal of Preventive Medicine 2009; 36(5):410-415
Meet the METs, Harvard Health Letter, September 2008
Exercise equals angioplasty for leg pain
Spronk S, Bosch JL, den Hoed PT, Veen HF, Pattynama PM, Hunink MG. Intermittent claudication: clinical effectiveness of endovascular revascularization versus supervised hospital-based exercise training--randomized controlled trial. Radiology 2009; 250:586-95.