AI quick summary
- Aim for 1.0–1.2 g of carbohydrate per kilogram of body weight per hour for the first 4 hours after a glycogen-depleting ride, with 0.3–0.4 g/kg of protein.
- The '30-minute anabolic window' is a myth — total daily protein and adequate carbohydrate across the day matter far more than a single post-ride shake.
- A 3:1 or 4:1 carb-to-protein ratio is the practical target; chocolate milk, rice and eggs, or oats and whey all hit it.
- Add 20–25 g of high-leucine protein at each meal to maximise muscle protein synthesis across the day, not just post-ride.
/ 01
What you are recovering from
A hard ride does two things that post-ride nutrition needs to undo. It depletes muscle and liver glycogen, sometimes severely if the ride was long or intense. It also damages muscle fibres — micro-tears in the contractile proteins that need to be repaired and reinforced before the next session. Glycogen restoration is mainly a carbohydrate problem; muscle repair is mainly a protein problem. Both run in parallel, and both are sensitive to dose and timing.
A third concern is fluid and electrolyte balance. A rider who finishes 2 kg lighter than they started is short 2 L of fluid plus the sodium that left with it, and rehydration needs both water and salt — pure water suppresses thirst before the deficit is closed.
/ 02
Carbohydrate dosing for glycogen replenishment
The maximum rate of muscle glycogen synthesis is about 5 mmol/kg/hour, reached with 1.0–1.2 g of carbohydrate per kilogram of body weight per hour in the first 4 hours after exercise. A 70 kg rider targets 70–85 g of carb per hour for 4 hours, then returns to normal meal frequency. Lower intakes (0.8 g/kg/hr) still work but slow the process; nothing beyond 1.2 g/kg/hr adds further speed, because the transporter (GLUT4) is saturated.
If the next session is more than 24 hours away, ordinary meals over the day restore glycogen fully and the post-ride window is much less critical. The window matters when the next session is the same day — stage racers, twicers, and back-to-back training days need aggressive fuelling immediately.
/ 03
Protein dosing and the leucine threshold
Muscle protein synthesis (MPS) is triggered by a dose of around 20–25 g of high-quality protein containing roughly 2–3 g of the amino acid leucine. Below that threshold, MPS barely responds; above it, the response saturates. For a 70 kg rider, 0.3–0.4 g/kg of protein per meal — about 20–30 g — maximises the MPS signal, and the same dose should repeat every 3–5 hours across the day. Total daily protein of 1.4–2.0 g/kg/day for endurance cyclists covers both repair and adaptation.
Plant-based proteins can hit the leucine threshold but usually need a slightly larger portion or a blend (rice + pea, or soy + wheat) to match the amino acid profile of whey or milk.
Post-ride recovery targets by rider body weight
| Body weight | Carb (g) per hour × 4 hr | Protein (g) per meal | Fluid (ml) per kg lost |
|---|---|---|---|
| 60 kg | 60–72 | 18–24 | 1,250–1,500 |
| 70 kg | 70–84 | 21–28 | 1,250–1,500 |
| 80 kg | 80–96 | 24–32 | 1,250–1,500 |
| 90 kg | 90–108 | 27–36 | 1,250–1,500 |
/ 04
The carb-to-protein ratio
The classic 4:1 or 3:1 carb-to-protein ratio in recovery products comes from studies showing added protein accelerates glycogen storage modestly beyond carbohydrate alone, and reduces muscle soreness. For most riders hitting the carb and protein targets above, the ratio takes care of itself. The simplest mental model: every post-ride plate should be mostly carbohydrate (rice, pasta, oats, bread), a palm of protein (eggs, chicken, tofu, whey), and a small amount of colour (vegetables, fruit) for micronutrients.
/ 05
Real-food options and the 30-minute myth
The 30-minute 'anabolic window' was overplayed. Muscle protein synthesis stays elevated for at least 24 hours after exercise, and glycogen restoration runs at near-maximal rates whenever carbohydrate is available. The window is real but wide — getting a balanced meal within 1–2 hours of finishing is sufficient for almost everyone. The exception is the rider doing two sessions in a day, where every minute of delayed glycogen storage costs time in the second session.
Real food beats supplements for most riders: 500 ml of chocolate milk lands at roughly 30 g carb and 16 g protein; two eggs on rice gives 35 g carb and 12 g protein; a bowl of oats with milk, banana, and a scoop of whey hits 75 g carb and 30 g protein. Shakes are convenient, not magical.
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