Sports Nutrition 3 Days Before a Standard-Distance Triathlon: The Science of Carbohydrate Loading

Introduction

A standard-distance triathlon’s 2-3 hours of exertion will deplete glycogen stores. “Carb Loading” in the 3 days before the race can raise muscle glycogen from 400g to 700-800g, buying an extra 20-30 minutes. This article covers the scientific approach and a menu using Taiwanese ingredients.

1. The Principle of Carb Loading

Key concepts:

• Muscle glycogen stores determine performance in efforts over 90 minutes
• Begin tapering training volume 36-48 hours before the race
• Simultaneously increase carbohydrate ratio to 65-70%
• Slightly reduce protein and fat

2. Day-by-Day Nutrition Plan (3 Days Before the Race)

Using a Sunday race as an example:

3. Sample Menu with Taiwanese Ingredients

Friday breakfast:

• 1 large bowl of oatmeal porridge (80g oats + milk + honey)
• 1 banana
• 1 egg
• 500ml water

Friday lunch:

• 1 large plate of pasta (oil-free sauce)
• 100g chicken breast
• Salad (light dressing)
• 500ml sports drink

Friday dinner:

• 1.5 bowls of white rice
• 1 piece of grilled fish
• Stir-fried vegetables (light oil)
• 1 bowl of red bean soup

4. Foods to Avoid

Taboos for the 3 days before the race:

• High-fiber foods (beans, brown rice, multigrain bread): prone to bloating
• High-fat foods (fried foods, fatty meat): slow to digest
• Spicy foods (hot pot, spicy flavors): irritate the stomach and intestines
• Alcohol: causes dehydration
• Unfamiliar foods: gastrointestinal risk
• Fresh raw seafood: risk of food poisoning

5. Hydration and Electrolytes

Each day for the 3 days before the race:

• 2.5-3 liters of water
• 1 liter of electrolyte drink
• Urine color a pale yellow is normal

Practical Tips

• Don’t overdo carbs to the point of gaining more than 2kg in body weight
• Finish dinner by 6 PM the day before the race
• Choose a familiar breakfast (3 hours before the race)
• Restaurant options near race accommodation are limited for Fulong and Kenting events; find them in advance
• Bring backup (toast, bananas, sports drinks) in case food cannot be found

Conclusion

Carb loading is not about “binge eating” but “precisely adjusting ratios.” Athletes who execute it well can gain an extra 30-60 seconds in the final 5km—it’s an underrated key detail. First-timers are advised to do a trial run during training first.

Related Reading

• Carb-Loading Three Days Before Race Day: Complete Plan and Practical Examples
• Marathon Carb Loading 3 Days Before: Complete Guide to Food Choices and Portion Calculations
• Marathon Pre-Race Carb Loading: A Practical 3-Day High-Carbohydrate Meal Plan
• Nutritional Supercompensation Strategy for the Week Before the Race: Maximizing Glycogen Stores