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Triathlon

A COMPETITION BEGINS AT THE REFRESHMENT STATION.

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.

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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.

Step 1

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.

Step 2

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.

Step 3

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.

Step 4

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“By kilometer 30 at the latest, I’m usually completely drained”—how can this be avoided during a race (marathon)?

You should simulate a race situation during training to get a feel for WHAT to eat or drink, in what AMOUNT, and at what TIME during the race, so you can avoid unpleasant surprises or symptoms caused by a drop in blood sugar levels. It’s also beneficial to eat plenty of carbohydrates (pasta, bread, dried fruit, etc.) in the days leading up to a marathon so that the energy stores in your muscles (glycogen stores) are well-filled. Additionally, for optimal preparation, your diet should be carefully planned in the hours leading up to the race.

There are also caffeinated sports drinks (e.g., Isomax Isotonic Sports Drink). When should these ideally be consumed?

Caffeine, in the right dosage, can boost performance both within 60 minutes BEFORE and/or DURING a prolonged endurance activity. Especially after the first half of a longer endurance session, consuming caffeine can delay the usual onset of fatigue and thus contribute to improved performance.

Doesn’t caffeine cause the body to lose fluid during exercise?

The scientific evidence does not confirm any link between moderate caffeine intake (< 5 mg/kg body weight) during exercise and a negative impact on fluid balance or even dehydration.

What should one make of carb loading? How exactly does it work?

Carboloading is a proven strategy for replenishing glycogen stores in the muscles (i.e., the body’s energy reserves). These strategies have changed significantly in recent years. Today, simplified methods are recommended: In the three days leading up to the competition, focus on a diet high in carbohydrates and low in fiber and fat, while simultaneously reducing your training volume. Foods rich in carbohydrates—such as pasta, rice, mashed potatoes, dried fruit, and fruit smoothies—are well-suited for this so-called “carb-loading phase.” Some easy-to-follow tips include: At meals, serve yourself two spoonfuls more of rice or pasta than usual; choose a banana for dessert instead of low-calorie berries; and eat an energy bar or a handful of raisins as a snack between meals. It’s important to know that effective carb-loading causes the body to retain additional water, since carbohydrates are stored in glycogen stores along with water. This increases your body weight. That means you’ll have to “carry around” a little extra weight. It’s therefore important to try out this sports nutrition strategy before a long and intense training session. Carb loading can definitely have a positive effect on longer endurance efforts!

When is the ideal time for cyclists to lose weight?

A reduced energy and carbohydrate intake should be planned for the off-season so that neither performance nor recovery is compromised. A diet can also increase the risk of injury and illness and should therefore be carefully planned and tailored to the individual cyclist.

What should vegetarians and vegans keep in mind?

A poorly planned omnivorous diet is no more balanced than a poorly planned vegetarian diet. A well-thought-out lacto-ovo-vegetarian or vegan diet appears to adequately meet an athlete’s nutritional needs. With a vegan diet, special attention should be paid to the intake of vitamins D and B12, omega-3 fatty acids, and the minerals iron and zinc. Vegans and vegetarians often have lower muscle creatine stores. In such cases, a suitable creatine supplement can be a sensible addition to their diet. This is because well-stocked creatine stores allow for more intense training, which can improve repeated sprint performance, for example.

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