What happens to your body after a marathon
A marathon inflicts significant damage: micro-tears in muscles, systemic inflammation (CRP x20-30), glycogen depletion, 2-3 liters of dehydration, and a weakened immune system for 24-72 hours.
The first few hours (H0-H6)
Rehydration: the top priority
Isotonic drink (water + salt + sugar) within the first 30 minutes. Aim for 1.5 L of water per kg lost. Avoid alcohol for the first 6 hours.
Immediate nutrition
Within 30-45 min: carbohydrates (banana, applesauce) + 20-25g of protein (Greek yogurt, shake) to initiate muscle reconstruction.
Day 1: the most difficult day
Cold: your best ally
- Ice bath (10-15 min at 10-15°C): reduces inflammation and accelerates the elimination of metabolic waste
- Alternating hot/cold shower if no bathtub is available
Pressotherapy
This is the ideal time for pressotherapy boots. A 15 to 25-minute session, at a gentle intensity, helps relieve the feeling of heavy legs.
Compression
Wear compression socks all day to maintain venous return and reduce swelling.
Day 2 and Day 3: progressive mobilization
20-30 min walk, protein-rich nutrition (1.6-2g/kg/day), omega-3s, vitamin C. Aim for 8-9 hours of sleep per night.
When to resume training?
- Day 1 to Day 7: rest and active recovery only
- Day 7 to Day 14: light 20-30 min jog if there is no pain
- Day 14 to Day 21: gradual resumption
- Day 28+: return to normal training
- Day 42 (6 weeks): competitions possible
The 5 mistakes to avoid
- Resuming too quickly (maximum risk of injury)
- Eating too little to avoid weight gain (delays recovery)
- Alcohol during the first few days (worsens edema)
- Excessive ibuprofen (blocks muscle repair)
- Ignoring persistent joint pain
Conclusion
Post-marathon recovery is a discipline in its own right. Hydration, nutrition, cold, compression, and sleep are its five pillars. Our equipment at Tout pour le corps is designed to support you during this critical period.