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Cardio exercise: How much do you really need?
ZOE Science & Nutrition
Different Energy Pathways in Muscles
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Muscles use different energy pathways, some requiring oxygen and others not. Strength exercises use pathways that don't need oxygen, but can only be sustained for short bursts. Cardio exercises, on the other hand, use oxygen and are known as aerobic exercise. These activities improve cardiovascular and respiratory systems. While strength training may visibly change muscles, the main benefits of cardio exercise are internal. VO2 max measures the capacity of the heart and muscles to utilize oxygen.
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