Sports Nutrition: Macronutrient Timing, Hydration Strategies, and Ergogenic Aids for Peak
Athletic Performance
Introduction
Nutrition is the fuel for training and competition. Proper timing of carbohydrates, proteins, and
fats, combined with strategic hydration and evidence-based supplements, can improve
endurance by 5–10 %, strength by 8–15 %, and recovery speed dramatically. This document
provides university-level detail on nutrient metabolism, timing windows, hydration science, and
legal ergogenic aids.
Section 1: Macronutrient Roles and Requirements
Carbohydrates: primary fuel (5–12 g/kg/day depending on sport).
Proteins: muscle repair and adaptation (1.6–2.2 g/kg/day for athletes).
Fats: hormone production and long-duration energy (20–35 % of total calories).
Section 2: Nutrient Timing – The Anabolic Window and Beyond
Pre-exercise (1–4 h): high-GI carbs + moderate protein.
During exercise (>60 min): 30–60 g carbs/hour (gels, drinks).
Post-exercise (0–2 h): 1.2 g/kg carbs + 0.4 g/kg protein for glycogen resynthesis.
Daily periodization: carb cycling for endurance athletes.
Section 3: Hydration and Electrolyte Science
Sweat rates: 0.5–3 L/hour.
2 % body-weight loss impairs performance by 10–20 %.
Sodium replacement: 300–600 mg/L in drinks.
Hyponatremia risk in ultra-endurance events.
Practical tools: pre/post weighing, urine color charts.
Section 4: Evidence-Based Ergogenic Aids
Creatine monohydrate: +5–15 % strength/power, 20–30 g loading phase.
Caffeine: 3–6 mg/kg improves endurance and alertness.
Beta-alanine: buffers lactate, effective after 4–10 weeks.
Beetroot juice (nitrates): lowers oxygen cost of exercise.
Sodium bicarbonate: for 400–1500 m events.
Section 5: Sport-Specific Nutrition Plans
Soccer: high-carb loading day before match + intra-game gels.
Bodybuilding: precise protein timing around workouts.
Marathon: 60–90 g carbs/hour during race.
Section 6: Common Mistakes and Monitoring
Over-reliance on supplements instead of whole foods.
Ignoring female athlete triad.
Blood biomarkers: ferritin, vitamin D, cortisol.
Conclusion
Strategic nutrition turns good athletes into elite performers. Timing, hydration, and proven aids
must be individualized and periodized alongside training