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Muscle cells need a specific form of energy for contraction and cannot use the energy released directly from breaking down glucose or triglycerides. Rather, body cells must first convert food to adenosine triphosphate (ATP).

So to answer simply, yes. But glycogen isn't used directly. Glycogen is converted to glucose, and then that is converted to ADP+pi, and that is converted finally to ATP, which is actually what fuels locomotion of the muscles when exercising.

This is a very non-detailed answer, but I hope it provides the answer you were looking for. Muscle cells need a specific form of energy for contraction and cannot use the energy released directly from breaking down glucose or triglycerides. Rather, body cells must first convert food to adenosine triphosphate (ATP).

Food is digested and processed into ATP through sever different stages. Glycogen is converted to glucose, and then that is converted to ADP+pi, and that is converted finally to ATP, which is actually what fuels locomotion of the muscles when exercising.

This is a non-detailed answer, but provides the basics of how muscles get energy.

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Q: How is energy provided to the muscles while exercising vigorously?
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