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The chances of you burning muscle at 150bpm are slim to none. In order for muscle wasting to occur, you must undergo extremely long bouts of exercise under malnourishment, and at elevated stress levels. Before muscle starts to waste, the body must no longer have other viable sources of fuel (ie glycogen, fatty acids, amino acids).
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.