"Glycogen reserves" refers to the stored form of glucose (sugar) in our bodies. It is like a backup energy source that our muscles and liver store for future use when we need extra energy. Full definition
Increased glycogen reserves help support muscle growth and energy levels. (fitnessandpower.com)
When you have hypothyroidism your liver loses its ability to respond efficiently due to low glycogen reserves and your adrenaline levels can continue to rise causing an increase in cortisol. (outsmartdisease.com)
Whether in training or competition, the body depends on glycogen reserves. (blog.bridgeathletic.com)