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Kate Battersby

The RAT 50km

5th August, 2023
England
Cornwall
Top 50
strava
Running, Ultra - 50km
14°C
, Mild
7hrs 14mins
more race details

Kate's headline numbers

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?
?
~115
g
Carb per hour
Recommended 75g/h
~553
ml
Fluid per hour
Recommended 250-750ml/h
~1,281
mg
Sodium per litre
Recommended 1200-1600mg/L
~6.2
mg
Caffeine per kg
Recommended 3-6mg/kg

Kate'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 75g/h
~115
g
Kate's Energy Rating
8
/10
"I kept it quite steady for the first half as I had a bit of a niggle from an ankle roll the weekend before but it definitely loosened as the race went on. I felt like I was getting stronger as the day went on even in a storm! I had so much energy left in the tank in the last 10k, and strangely had no DOMS afterwards either. So considering this I wish I went for it a bit more."
Our thoughts

Kate did extremely well to average ~115g of carb per hour across her seven hour race. She used a combination of carbohydrate in her bottles and gels to hit a target intake that many competitors would struggle to match. This is testament to the gut training Kate has undertaken in the two years prior to this race. The impressive carbohydrate intake during this race will have contributed to her lack of DOMS post race too, which is why we suggest fueling adequately during training sessions when you need to recover quickly.

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.

Pre-loaded electrolytes
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T - 60mins: Drank ~500ml of strong electrolyte drink
Fluid per hour
Recommended 250-750ml/h
~553
ml
Sodium per litre
Recommended 1200-1600mg/L
~1,281
mg
Kate's Hydration Rating
9
/10
"I felt well hydrated throughout, I didn't need to pee during the race but was able to go straight after. I was really glad I bought a new hydration pack which could hold more fluid as I could be more self-sufficient during this race than my previous races. "
Our thoughts

The fact that Kate didn’t feel the need to pee, but also reported no cramping or dehydration related issues (i.e. headaches or performance decline), highlights that she all but nailed her intake here. Kate’s perception of her hydration strategy being a 9 (out of 10) gives us confidence that she can take a similar approach going forwards to her future races, while considering any variance in environmental conditions. For example, she’d need to drink a greater volume of fluid if her sweat rate increases due to warmer temperatures.

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
?
Consuming caffeine in the hours before the start may have increased perceived energy levels
Caffeine per kg
Recommended 3-6mg/kg
~6.2
mg
Our thoughts

While Kate didn’t report any caffeine intake before the race, she did still hit the recommended 6 mg of caffeine per kilo of bodyweight through the four PF 30 Caffeine Gels she took at even intervals throughout the race. Because caffeine has a half life of four to five hours (meaning half is still left in your system after this time), Kate will have felt the performance enhancing effects of reduced perceived effort and enhanced focus right through to the finish line.

How Kate hit her numbers

Here's everything that Kate ate and drank on the day...

Kate's weapons of choice

Final thoughts

Kate's Satisfaction Rating
8
/10
I had the best weekend - I loved it! Even the savage weather! I feel like I've got my fueling strategy locked down now, so I'm really looking forward to seeing what my body can do with an all out effort at the next one!
Kate
After nailing her fueling strategy for her first ultra at Maverick Exmoor earlier in 2023, Kate feels after this ‘RAT race’ that she’s unlocked a new potential for performance and is looking forward to testing her limits. She is providing her body with plenty of available energy via her fueling, but will need to be conscious of her fluid and sodium intake depending on the weather conditions at her next event.
PF&H

Kate's full stats

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?
?
Overall
833g total carb
115g per hour
4,000ml total fluid
553ml per hour
5,125mg total sodium
708mg per hour
1,281mg
Sodium per litre
400mg total caffeine
6.2mg 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 some confidence in the quantities and brands of products consumed but the data may lack specifics (e.g. volumes specific flavours). A high number of estimations have been made and the room for error is moderate-high. There may also be the possibility that some intake has been grossly over- or under-estimated.

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