ask our dietitian your question todayheart rate cardio and fat burning

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Is it true that you need to find the perfect balance of your heart rate during cardio, or else you will start to burn muscle instead of fat? – Daniel M.


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No. The use of MUSCLE for energy doesn’t really happen during exercise. What you are referring to is associated with a prolonged under consumption of calories over a period of days.  – Debbie J., MS, RD

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Debbie James is a registered dietitian. Any views or opinions presented in this article are solely those of the author and do not necessarily represent the opinions or recommendations of Fitness International, LLC.