The predominate fuel used by muscle during a 10K race (~50 minutes) is

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During a 10K race, the main source of fuel for muscles is carbohydrate, which can be stored as glycogen in the muscles and liver. This glycogen can be broken down into glucose and used as energy during exercise. While some fat may also be used as fuel during lower-intensity exercise, carbohydrate is the primary fuel source for higher-intensity exercise like a 10K race. Creatine phosphate is a quick source of energy for very short bursts of muscle activity, while protein is not a significant fuel source during exercise.

The Predominate Fuel Used by Muscle During a 10K Race