Fitness
Glycogen Sparing on Keto Endurance
Glycogen sparing on keto endurance stretches limited carb stores on easy long efforts via fat and ketones—hills and fast finishes still need glucose.
Glycogen sparing on keto endurance describes using more fat and ketones at zone 1–2 so limited muscle glycogen lasts longer on long easy efforts—not eliminating glycogen need for hills or finishes. Sparing helps ultrarunners between aid stations; it does not replace carbs for a fast 5K.
Train the pace you plan to race easy.
Common questions
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Does glycogen sparing mean zero carbs on ultras?
Many keto-trained ultrarunners still use targeted carbs at aid stations for climbs and late race pace. Sparing delays depletion; it rarely removes it.
Related terms
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