Nutrient Timing — Pre, Intra, and Post-Workout
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When you eat matters less than total daily intake, but sensible peri-workout nutrition supports performance and recovery — especially for endurance and twice-daily training.
Detail
Nutrient timing is the strategic intake of macronutrients around exercise. The ISSN's evidence-based position is that total daily protein and carbohydrate are the dominant factors; precise timing offers a smaller, situational benefit that matters most for fasted training, two-a-day sessions, and prolonged endurance.
Pre-workout (1–4 h before): A meal with carbohydrate (to top off glycogen) and protein supports performance and primes recovery. Closer to training, choose smaller, easily digested, lower-fat/fiber options to limit GI distress.
Intra-workout: Generally unnecessary for sessions under ~60 minutes. For prolonged endurance, in-exercise carbohydrate (~30–60 g/h, up to ~90 g/h with mixed glucose-fructose for very long efforts) sustains output and spares glycogen (see Endurance Fueling). Caffeine timing also falls here (see Caffeine as an Ergogenic Aid).
Post-workout: Provide protein (~0.25 g/kg or 20–40 g) to stimulate muscle protein synthesis and carbohydrate to begin glycogen restoration. The urgency is low when the next meal is within a few hours, but high when recovery time is short (e.g., ~1.2 g/kg/h carbohydrate when <4 h between sessions — see Recovery Nutrition).
The overarching priorities: hit daily totals, distribute protein every 3–4 h (see Protein Distribution Across the Day), then refine timing for the specific training context.
Key facts
- Daily totals dominate; timing is a situational optimization.
- Timing matters most for fasted training, two-a-days, long endurance.
- Pre (1–4 h): carbs + protein; lighter/lower-fiber closer in.
- Intra: usually only needed >60 min — ~30–60 g carb/h (up to ~90 g/h very long).
- Post: ~20–40 g protein + carbs; rapid carb (~1.2 g/kg/h) only if <4 h to next session.
Connections
- The "Anabolic Window" — Evidence vs Hype — the post-workout protein window, de-hyped.
- Protein Distribution Across the Day / Carbohydrate Timing for Endurance — the macro-specific timing.
- Recovery Nutrition — restoring glycogen and repairing muscle.
- Endurance Fueling — intra-exercise carbohydrate.
Sources
See how this applies in practice, with honest limits on what the plan changes.
Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.