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Dave Blow

Bowline CC Charnwood Hills Race

4th February, 2024
England
Leicestershire
Top 50
Running, Half marathon - 23.3km
12°C
, Mild
1hr 54mins
more race details

Dave's headline numbers

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?
?
~79
g
Carb per hour
Recommended 30g/h
~262
ml
Fluid per hour
Recommended 100-500ml/h
~1,000
mg
Sodium per litre
Recommended 1600-2000mg/L
~2.8
mg
Caffeine per kg
Recommended 3-6mg/kg

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)
pre-fueled
?
T - 15mins: Took in a final dose of carb
Carb per hour
Recommended 30g/h
~79
g
Dave's Energy Rating
9
/10
"My energy levels felt good but I was very frustrated to not be able to push on in the last few kilometres. The energy was there but the legs didn't want to play ball."
Our thoughts

Dave pushed his carb intake past scientific recommendations for a race of this duration but tolerated it comfortably. He had undertaken some serious gut training in the lead up to this race in the hope he could tolerate a high carb intake and keep energy levels up. This preparation paid off, as on race day, he didn’t have any GI issues. With a strong carb intake like this in such a short race, Dave is in a good position physiologically to take this strategy into longer races like his upcoming Jurassic Coast Challenge. Dave also worked hard on carb loading in the days leading up to the race, using it to excuse his double lunch servings in the office! Particularly for a race of this duration, it is extremely important to carb-load effectively in order to maximise energy stores.

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 Mild.

Learn more
Pre-loaded electrolytes
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T - 60mins: Drank ~500ml of strong electrolyte drink
Fluid per hour
Recommended 100-500ml/h
~262
ml
Sodium per litre
Recommended 1600-2000mg/L
~1,000
mg
Dave's Hydration Rating
8
/10
"I drank what I felt I wanted throughout the day and didn't get thirsty. "
Our thoughts

It's evident from the cramp Dave experienced in the latter stages that he didn’t quite replace enough of his sweat losses. With his high sweat sodium concentration and relatively high sweat rate from his calculations on the day, it’s crucial for Dave to focus on drinking the right strength electrolyte (and in his case, a high strength one). He should consider increasing his sodium intake for his next race to avoid accumulating a deficit and hopefully prevent the cramping issues he experienced this time around. A simple way to do this would be by switching the Carb and Electrolyte Drink Mix he used for Carb Only Drink Mix and personalising his hydration by using additional PH 1500 (tablets).

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.

Pre-caffeinated
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T - 0-4hrs: Had a final hit of caffeine
Caffeine per kg
Recommended 3-6mg/kg
~2.8
mg
Our thoughts

Dave used some caffeine to help boost his alertness during the race by having a coffee with his breakfast and a PF 30 Caffeine Gel 15 minutes out from the start. As Dave was slightly under the recommended range of 3-6 milligrams per kilogram of bodyweight, he could look to increase his intake slightly to help with the perception of fatigue he experienced towards the back end of the race, and get all of the ergogenic benefits associated with caffeine.

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
4
/10
I’m pretty gutted to be honest. Although my time and average pace wasn’t far off past years and the conditions were tough, if I could’ve held out for the last 2km I would’ve been very pleased with the run. It was very frustrating to be managing cramp in the closing stages.
Dave
Dave had a solid race at his childhood town in Charnwood, despite feeling disappointed with his result. Some alterations to his hydration strategy during the next race, particularly a higher sodium intake, will help to avoid the fatigue and cramp he felt towards the end of the run.
PF&H

Dave's full stats

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?
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Overall
150g total carb
79g per hour
500ml total fluid
262ml per hour
500mg total sodium
262mg per hour
1,000mg
Sodium per litre
200mg total caffeine
2.8mg 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.
1
2
3
4
5

There is an adequate level of accuracy in the data collected and the numbers reported. The athlete manages to recall what they ate and drank including most specifics (brands flavours quantities plausible estimations of volumes). However there are estimations made within the data which affect the overall confidence level in the data reported.

Dave's recent case studies

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