Glycogen

Glycogen is the most important storage form of glucose in the human body and represents a rapidly available energy reserve. Chemically, it is a highly branched polysaccharide that is stored above all in the liver and in the skeletal muscles. Glycogen enables the body to store excess glucose temporarily and to release it again quickly when needed in order to avoid energy shortages. Characteristic of glycogen are its compact structure and its high accessibility for enzymes. Thanks to the pronounced branching, glucose can be mobilized within a short time. While liver glycogen primarily serves to stabilize the blood sugar level, muscle glycogen is used directly on site for energy production during physical activity.

What functions does glycogen fulfill in the body?

Short-term energy store: Glycogen provides rapidly available energy, especially during physical exertion or abstinence from food.
Stabilization of the blood sugar level: Liver glycogen is broken down when needed in order to keep the glucose level in the blood constant.
Energy supply of the musculature: Muscle glycogen delivers energy for contraction, strength performance and endurance.
Buffer function in metabolism: Glycogen balances out fluctuations between food intake and energy consumption.
Support of performance capacity: Well-filled glycogen stores are decisive for physical and mental performance capacity.
Basis for fast metabolic reactions: Through the rapid build-up and breakdown, the body can react flexibly to exertion.

How does glycogen work in the body?

The effect of glycogen results from its dynamic build-up and breakdown:

Storage (glycogenesis): Excess glucose is converted into glycogen under the influence of insulin and stored.
Mobilization (glycogenolysis): When energy is needed, glycogen is broken down enzymatically and glucose is released.
Tissue-specific use: Liver glycogen serves the entire organism, muscle glycogen exclusively the respective muscle.
Rapid availability: The pronounced branching allows many enzymes to gain access at the same time.

What happens when glycogen gets out of balance?

Depleted glycogen stores

Drop in performance
Rapid fatigue
Increased feeling of hunger

Overfilled stores

Limited storage capacity
Excess glucose is converted into fat

Individual differences

Storage capacity and use vary depending on training status, nutrition and metabolic state.

Conclusion

Glycogen is the central energy store for short-term exertion and connects food intake, blood sugar regulation and physical performance capacity. Thanks to its rapid mobilization, it ensures that energy is available at any time according to demand. A balanced glycogen balance is therefore essential for metabolic stability and performance capacity.