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Only excessive amounts of cardio would cause you to lose muscle because over-training tips the scale towards the catabolic side. It's difficult to generalize and pinpoint one specific amount as too much, but I think it's safe to assume that just about anyone could do up to 45 -60 minutes of cardio a training beginner marathon day, training beginner marathon 6 to 7 days a week without losing any muscle - as long as the proper nutritional support is provided. Trainer John Parillo training beginner marathon has always been an advocate of lots of aerobics, even for his bodybuilder clients who are trying to gain muscle mass. "Aerobics can enhance your recovery from weight training by promoting blood flow and oxygen transport to your muscles," says Parillo. "Aerobics forces oxygen through your body, increasing the number and size of your blood vessels. Blood vessels are the 'supply routes' that transport oxygen and nutrients to body tissues, including muscles, and carry waste products away for muscular growth, repair and recovery.
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