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Dave Blow

Jurassic Coast Challenge

22nd March, 2024
England
Weymouth
5th, M40-44
Running, Ultra - 136.6km
8.5°C
, Cold
17hrs 3mins
more race details

Dave's headline numbers

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?
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~57
g
Carb per hour
Recommended 75g/h
~434
ml
Fluid per hour
Recommended 500-1,000ml/h
~1,174
mg
Sodium per litre
Recommended 1600-2000mg/L
~4.0
mg
Caffeine per kg
Recommended 3-6mg/kg
Image Credits: Raff Hussey

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.

Carb-loaded
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T - 1-4hrs: Ate a carb rich meal (Low in fat & fibre)
Didn't pre-fuel
?
Dave would benefit from taking in a final dose of carb <30 minutes before
Carb per hour
Recommended 75g/h
~57
g
Dave's Energy Rating
8
/10
"Day one started off okay, but I had to slow down on eating due to feeling sick which really affected my energy. I managed to build it back up on day 2 and 3 and actually felt better as each day progressed, despite my legs feeling shot from the start. Eating the flapjack bites really helped mix it up."
Our thoughts

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.

Dave1850mg/L
Dave has been Sweat Tested to dial in his hydration plan

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 more
Pre-loaded electrolytes
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T - 60mins: Drank ~500ml of strong electrolyte drink
Fluid per hour
Recommended 500-1,000ml/h
~434
ml
Sodium per litre
Recommended 1600-2000mg/L
~1,174
mg
Dave's Hydration Rating
7
/10
"Across the three days, I made a real effort to keep drinking, but I think I might have overdone it on the Carb & Electrolyte Drink Mix on day one. By switching up my fluids with plain water and PH 1000 tabs I felt a lot better, but still struggled to drink enough on the last day."
Our thoughts

Dave 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.

Didn't pre-load caffeine
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Consuming caffeine in the hours before the start may have increased perceived energy levels
Caffeine per kg
Recommended 3-6mg/kg
~4.0
mg
Our thoughts

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 Satisfaction Rating
9
/10
I was really pleased to be able to finish the race. It started off quite tough with a bad first day, particularly with GI issues but I was happy to be able to make a comeback and finish strong. In future I would definitely try to include more proper food from the start of each day when the intensity was lower and do more gut training with the drink mix.
Dave
For Dave’s first multi-day running event, he navigated his GI and energy issues to comfortably complete the race (and finish 5th overall) and be welcomed by the PF&H team at the finish line.
PF&H

Dave's full stats

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Overall
971g total carb
57g per hour
7,400ml total fluid
434ml per hour
8,690mg total sodium
509mg per hour
1,174mg
Sodium per litre
300mg total caffeine
4.0mg per kg

Data Confidence
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We rate each of our case studies from 1-5 based on the level of accuracy, and our confidence in the data.
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2
3
4
5

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.

Dave's recent case studies

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