
Dave Blow
Jurassic Coast Challenge
Dave's headline numbers
Dave's strategy
Fueling
Carbohydrate is the main fuel you burn when racing. Failing to fuel properly is a leading cause of underperformance in longer races.
Dave struggled with his energy levels at the start of day one, but by adapting his fueling strategy and introducing some variety in the form of solid foods he managed to put a spring back in his step and improve his comfort as the days progressed. In addition to this, due to the multi-day format of this race, Dave was fortunate to be able to refuel between stages at dinner with high-carb foods such as pasta and bread. He struggled to take on more carbs and had a few GI issues and was feeling quite full, which suggests that Dave would have benefitted from some gut training in the weeks prior to ultra events in the future. This would also help him to increase his carb intake per hour to reach the scientific recommendations of 75g/h and contribute to more sustained energy levels.
Hydration
Taking on board an appropriate amount of fluid and sodium is essential to maintaining blood volume and supporting the cardiovascular effort needed to perform on race day.
Whilst the absolute amount of sodium and fluid consumed per hour is important, it’s critical to consider these in relation to each other. This is known as 'relative sodium concentration' and it’s expressed in milligrams per litre (mg/L). How much sodium you’re taking in per litre of fluid is more important than the absolute amount taken in per hour.
Sweat sodium concentration (mg/L) is largely genetically determined and remains relatively stable. Knowing how salty your sweat is enables you to replace a good proportion of your sweat losses, which can range from 200-2,000mg/L.
Given Dave’s losses are Very High (1,850mg/L), nailing his hydration strategy remains important, even when it’s Cold.
Learn moreDave preloaded effectively using PH 1500 immediately prior to each day. This helped make sure he was caught up on the deficit of a day's sweat losses - particularly with his high sweat sodium concentration - to start each stage optimally hydrated. Dave used soft flasks to carry his fluids and made sure he kept them topped up at the aid stations and with the help of his crew. Some more practice with the PF Carb & Electrolyte Drink Mix would have really helped Dave feel confident at tolerating the volume required and help him stick to his hydration strategy in future races.
Caffeine
Beyond the Three Levers of Performance (carb, sodium and fluid), caffeine is one of only a few substances that is proven to improve performance for most endurance athletes as it can help stave off mental and physical fatigue.
Despite Dave’s total caffeine intake per kg of body weight being within the recommended range at ~4.0mg/kg, per day he only consumed ~1.4mg/kg. This is outside the recommended guidelines and we would also encourage Dave to pre-caffeinate with caffeine immediately prior to the race and implement a more consistent caffeine intake throughout the race to help reduce his perceived ratings of exertion and fatigue.
How Dave hit his numbers
Here's everything that Dave ate and drank on the day...
Dave's weapons of choice
Final thoughts
Dave's full stats
Data Confidence?
There is a high level of confidence in the accuracy in the data. The numbers presented are believed to be a very close reflection of reality. There may still be one or two estimations made in the data (an inescapable part of field data) but there is reason to believe that these are accurate and that possible error has been kept to a minimum. It is data that has been collected and recalled as accurately as is possible given the uncontrolled settings/circumstances.