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Marathon Carbohydrate Fueling: A Scientific Energy Strategy

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Why Carbohydrates Matter

  • Muscle glycogen stores are limited (400-600g)
  • A marathon requires 2.5-4 hours
  • Carbohydrates are the most efficient fuel

Pre-Race Carbohydrate Loading

Period Carbohydrate Intake
Normal days 5-6 g/kg body weight
Loading days 8-10 g/kg body weight

In-Race Fueling

Race Duration Carbs per Hour Fueling Interval
0-90 minutes 0-30g Optional
90 minutes-3 hours 30-60g Every 15-20 min
Over 3 hours 60-90g Every 15-20 min

Fueling Options

  • Energy drinks: Replenish fluids and electrolytes simultaneously
  • Energy gels: Lightweight, concentrated 20-30g carbs
  • Solid foods: Bananas, energy bars (slower to digest)

Key Principles

Never try anything new on race day

All fueling products must be tested during training.

Conclusion

A scientific fueling strategy ensures sufficient energy throughout a marathon and prevents hitting the wall.

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