A long held belief is that cardio “kills gains” or causes muscle loss. The idea behind this is that while running, glycogen (stored energy) in muscles is depleted, then muscle is the next source of energy.
However, muscle is not typically a first resort to break down for energy in the body. Fat is the primary stored energy source after glycogen. With large volumes of cardio, your body will start to take energy from your fat.
Cardio can actually aid muscle gain in reasonable amounts. This is due to the fact that your cardiovascular abilities increase, allowing you and your muscles to more efficiently use oxygen. The ultimate result is the ability to work harder.
The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
1) An investigation into the effect of skeletal muscle metabolic function & cardio-respiratory fitness on exercise capacity in the presence and absence of disease - Jones Siana
2) Comparisons of Resistance Training and “Cardio” Exercise Modalities as Countermeasures to Microgravity-Induced Physical Deconditioning: New Perspectives and Lessons Learned From Terrestrial Studies - James Steele, Patroklos Androulakis-Korakakis
3) Efficacy of cardio resistance training and concurrent training on resting metabolic rate and respiratory rate among sedentary males - Selvamurugamani, Dr. PK Senthilkumar
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