Monday, May 5, 2025

Total carbohydrate/glycogen depletion and supercompensation

Total carbohydrate/glycogen depletion and supercompensation is a concept from exercise physiology, particularly relevant to endurance athletes, and is often used to enhance performance through dietary and training manipulation. Here's a clear breakdown:


1. Glycogen Depletion

Glycogen is the stored form of glucose in the liver and muscles. During prolonged or intense exercise, glycogen stores are used for energy.

  • Depletion Phase: This involves reducing carbohydrate intake and continuing intense training to significantly lower glycogen stores. The goal is to "empty the tank."

2. Supercompensation

After glycogen depletion, the body becomes more efficient at storing glycogen in response to carbohydrate intake.

  • Loading Phase: After depletion, the athlete increases carbohydrate intake (often to 70%+ of daily calories) while reducing training volume.
  • The muscles respond by storing more glycogen than before—sometimes 150–200% of baseline levels.

Why It Matters

  • Endurance Boost: More glycogen means more energy available for long-duration efforts (like marathons or cycling events).
  • Water Retention: Each gram of glycogen stores with ~3–4 grams of water, which can increase muscle volume and body weight.

Modern Perspective

Many athletes now skip the extreme depletion phase and simply load carbs 1–3 days before competition, as it's often safer and nearly as effective.



Sample

7-Day Glycogen Depletion & Supercompensation Plan

Overview

Days 1-3: Glycogen depletion (low-carb, high training)

Days 4-6: Glycogen supercompensation (high-carb, taper training)

Day 7: Competition or performance day

Day 1-3: Depletion Phase

Diet:

- Carbohydrates: 10-15% of daily calories

- Protein: Moderate

- Fat: Higher than normal

Training:

- High-intensity or long-duration workouts (intervals, long runs/rides)

Goal: Burn through glycogen stores

Day 4-6: Supercompensation Phase

Diet:

- Carbohydrates: 70-80% of daily calories (8-12g/kg body weight)

- Protein: Moderate

- Fat: Low

Training:

- Light activity or tapering to conserve glycogen

Goal: Maximize glycogen storage in muscles

Day 7: Race/Event Day

Morning meal: High-carb, low-fiber, low-fat meal 2-3 hours before


7-Day Glycogen Depletion & Supercompensation Plan

Hydration: Maintain fluid intake to match glycogen-bound water

Optional: Carbohydrate gel or drink during event if it's longer than 90 minutes

Sample Carb-Rich Foods (Days 4-6)

- White rice, pasta, bread

- Potatoes, yams

- Bananas, dates, applesauce

- Sports drinks, fruit juices

- Low-fat granola or cereal

Cautions

- Water retention may cause bloating or slight weight gain

- Not recommended for diabetics or people with insulin sensitivity

- Test before race day to understand individual response

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