Master triathlon nutrition
Expert tips on pre-training fuelling, carbohydrate intake, and race-day strategies. Optimize endurance, recovery, and performance for events like IRONMAN 70.3 and IRONMAN with these proven guidelines.
Introduction
Proper nutrition plays a vital role in triathlon training and racing, ensuring you maintain peak performance and endurance. From early morning training sessions to long-distance races like IRONMAN, understanding pre-training fuelling, carbohydrate consumption during exercise, and race-day nutrition can make or break your performance. This guide offers actionable insights into optimizing your diet for every stage of your triathlon journey, helping you fuel smarter and perform stronger.
Pre-Training Fuelling Guidelines
Optimal Fuelling
- Optimal fuelling should ideally start with carbohydrate intake 2-3 hours before exercise even begins.
- Liver glycogen stores are short-lasting because they are used to maintain blood glucose levels at rest and during light activity.
- Replenishing these stores by consuming carbohydrates before endurance exercise ensures an adequate supply of glucose to muscles and to the brain.
Early Morning Training
- If you train early in the morning it can be difficult to consume the recommended amount of carbohydrate in the suggested window of one to three hours prior to exercise.
- In this situation, you should try to eat a small snack or sports nutrition product (containing approximately 30-40 grams of carbohydrate) immediately before exercising.
- Alternatively, you could start to consume carbohydrates very early during the session (for example, within the first 10-15 minutes of the session they might use an energy gel or chew).
Evening Training
- To accommodate the typical daytime work schedule, you may choose to complete training sessions in the evening prior to dinner.
- Preparation for an evening session will depend on the type (intensity and duration) of the session.
- For long and/or intense sessions, you should consume a high-carbohydrate breakfast and lunch, and make sure to eat a light meal or snack one to four hours prior to exercising.
- A moderate amount of carbohydrate at breakfast and lunch is usually sufficient to fuel easier and/shorter evening sessions.
Fuelling Guidelines During Training & Racing
Up to 1 Hour
- If you have properly fuelled prior to exercising, hydrating the body with water and/or sports drinks is sufficient for most athletes exercising less than one hour.
- If you have multiple training sessions in a day, carbohydrate consumption in amounts typically provided in sport drinks (6% to 8%), especially for those who exercise in the morning after an overnight fast, will help maintain blood glucose levels and improve performance.
1 to 2.5 Hours
- For training sessions lasting up to 2.5 hours, you should consume 40 to 60 grams of carbohydrate per hour.
- Foods and fluids should be consumed in regular short intervals, such as every 15 to 20 minutes, to allow time for gastric emptying and absorption.
- Training is an ideal time for you to experiment with foods and nutrition products to determine which you prefer. This should all be determined well ahead of an actual IRONMAN competition.
Over 2.5 Hours
- For training sessions lasting more than 2.5 hours, you should consume a minimum of 60-70 grams of carbohydrate per hour, and up to 90-120 grams of carbohydrate per hour.
- When aiming at the upper limit of carbohydrate intake it is critical to select products with multiple carbohydrate sources including glucose, glucose polymers (such as maltodextrin and dextrose) and fructose. Foods and fluids should be consumed in regular intervals, such as every 15 to 20 minutes in order to minimize the risk of gastrointestinal issues.
Race Nutrition Guidelines
Carbohydrate Loading
- Since carbohydrates are the limiting fuel source for endurance athletes, the goal in the days leading up to an event is to ensure both muscle and liver glycogen stores are optimised.
- The carbohydrate loading period can vary depending on your preferences but will typically be 24 to 72 hours in duration.
- For IRONMAN and IRONMAN 70.3 events, you should consume 10 to 12 grams of carbohydrate per Kg bodyweight for 24 to 36 hours in combination with an exercise taper.
Pre-race Nutrition Guidelines
- Consuming a meal 3 to 4 hours pre-race (containing between 3 and 4 grams of carbohydrate per kg bodyweight) is preferable to give you sufficient time to digest and absorb the food as well as minimising the risk of gastrointestinal issues.
- Alternatively, you could consume a carbohydrate-rich meal two to three hours before the event, and this meal should contain between 2 and 3 grams of carbohydrate per kg bodyweight.
- If you choose to eat closer to the race (between 90- and 60-minutes pre-race) you should consume 1 to 1.5 grams of carbohydrate per kg bodyweight. Carbohydrates should be mainly derived from liquid or semi-solid solid foods including carbohydrate-rich drinks, gels, chews, or energy bars.
- Between 10- and 15-minutes pre-race, consuming 25-50g of carbohydrates in the form of a gel or chew is advised.
Race Nutrition
- Fuelling during the bike leg of a 70.3 or IRONMAN event is critical to set up a good run leg. During the bike, you should aim to consume a minimum of 60-70 grams of carbohydrate per hour, and up to 90-120 grams of carbohydrate per hour, depending on your individual tolerances.
Summary
Effective nutrition is essential for triathlon success, as it fuels endurance, supports recovery, and enhances overall performance. You should prioritize pre-training carbohydrate intake to replenish liver glycogen and maintain blood glucose levels, with tailored strategies for morning and evening sessions. During training, hydration and precise carbohydrate consumption (40–120 grams per hour, depending on session duration) are crucial, with regular intervals ensuring proper absorption and minimizing gastrointestinal issues.
In race preparation, carbohydrate loading 24–72 hours prior and well-timed pre-race meals help maximize glycogen stores. During the race, especially in events like IRONMAN, consuming 60–120 grams of carbohydrates per hour on the bike sets the foundation for a strong run. Following these guidelines ensures optimal energy availability, allowing you to perform at your best throughout your triathlon journey.
Checkout these useful links for further help and information:
https://www.infinitnutrition.com.au/ & https://www.centrednutrition.com.au/
