The Scientific Guide to Long-Distance Nutrition for Triathletes
Long-distance triathlons (3.8 km swim, 180 km bike, 42.2 km run) place extraordinary demands on energy and fluid balance. Race durations ranging from 8 to over 14 hours require a precise nutrition strategy.
75–90 min
Range with Full Glycogen Stores at High Intensity
14-30 %
Triathletes suffer from gastrointestinal discomfort
2-4 %
Weight loss due to sweating has been shown to reduce performance
Why nutritional mistakes determine whether you cross the finish line or DNF
The muscle and liver glycogen stores of an averagely trained athlete hold about 1,500–2,000 kcal, while fat stores amount to 80,000–100,000 kcal even in lean athletes. During intense endurance exercise near the anaerobic threshold, the stored glycogen—even when reserves are fully replenished—lasts for about 75–90 minutes—a fraction of the race duration in a long-distance event.
Regardless of the distance, dehydration and carbohydrate depletion are considered the most likely causes of exhaustion in triathlon, while gastrointestinal complaints, hyperthermia, and hyponatremia become particularly relevant during longer competitions.
Scientifically Based
The Scientific Guide to Long-Distance Nutrition for Triathletes
Preparation
36–48 hours before the start
In the last 36–48 hours before the start, many long-distance athletes rely on carb loading to fill their muscle glycogen stores beyond normal levels. A carbohydrate intake of 10–12 g per kg of body weight per day is recommended, along with a reduction in training volume. Studies show that supercompensated glycogen stores can improve performance by about 2–3% during exercise lasting more than 90 minutes.
3–4 hours before the start
A carbohydrate-rich meal (1–4 g carbohydrates/kg body weight) with low fiber and fat content. Hydration: 5–10 ml/kg body weight spread over the last 2–4 hours before the start.
Fuelling
During the competition
Der Kohlenhydrattransporter SGLT-1 sättigt bei ca. 60 g Glukose/Stunde. Durch Komporter (SGLT-1 bzw. GLUT-5) aufgenommen werden — lässt sich die Absorption auf bis zu 90 g/Stunde steigern. In Studien mit Halbdistanz-Triathleten verbesserten kombinierte Kohlenhydrate gegenüber reiner Glukose die Oxid
Since the cycling segment offers the most comfortable position, the majority of food intake takes place there. The transition to the running segment, with reduced carbohydrate availability, often forces athletes to slow their pace. Important: Systematic gut training during preparation has been shown to improve carbohydrate tolerance.
Hydration & Electrolytes
36–48 hours before the start
A fluid loss of 2–4% of body weight is considered a tolerable target range. Endurance performance has been shown to decline even at 2–4%. The average sodium concentration in sweat is 820 mg/L—"salty sweaters" lose significantly more.
Warning: Hyponatremia
Serum sodium levels below 135 mmol/L result from excessive fluid intake beyond sweat loss and can be life-threatening in severe cases.
Recovery
Glycogen
Complete recovery: 1.0–1.2 g of carbohydrates per kilogram of body weight per hour during the first 2–4 hours, divided into several portions.
Rehydration
In cases of severe dehydration (≥5% body weight loss) and a short recovery period (<12 h): Replace 125–150% of fluid loss (1.25–1.5 L per kilogram lost).
In a study of ultra-distance athletes, the average energy intake was 3,643 kcal, compared to an estimated energy expenditure of 11,009 kcal—a deficit of approximately 67%. Post-race nutrition must go beyond mere glycogen replenishment to account for a complete energy balance.
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