[header] How to understand the impact of carbohydrate loading [title] Know when to carbohydrate load. [step] For carbohydrate loading to have an impact, you must be doing an endurance activity lasting longer then 90 minutes. The muscles typically store enough energy for 60 to 90 minutes of activity. 
With carbohydrate loading you should have enough energy to last more than 90 minutes without fatigue. [title] Understand how carbohydrate loading impacts performance.