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Jonny Green

Amstel Gold Sportive

19th April, 2025
Netherlands
Limburg
Completed
Cycling, Road - 240km
11°C
, Mild
11hrs 36mins
more race details

Jonny's headline numbers

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?
?
~82
g
Carb per hour
Recommended 75g/h
~431
ml
Fluid per hour
Recommended 250-750ml/h
~793
mg
Sodium per litre
Recommended 700-1100mg/L
0
mg
Total caffeine

Jonny'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-rich meal
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T - 1-4hrs: Ate a carb rich meal (Low in fat & fibre)
pre-fueled
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T - 15mins: Took in a final dose of carb
Carb per hour
Recommended 75g/h
~82
g
Jonny's Energy Rating
8
/10
"For the first 7 hours, my energy levels were really good, and I had a healthy cadence and power. Then from hours 7 to 10, I did struggle, and had to nurse it up the climbs at times, which I’m putting down to undertraining for that amount of elevation."
Our thoughts

For a 10-hour ride with 3,000m / 9845ft of climbing, Jonny built, practised and executed a consistent fueling strategy that got him close to his target of 90g of carb per hour. He managed to average ~82g/h across his elapsed time which is well in line with the guidelines for rides of this duration and intensity. To achieve this, he took one PF 90 Gel each hour, except for hours 3-4 and 7-8, where he swapped these for PF 60 Chew Bars. He stuck to his pre-planned gels and chews, and impressively had no stomach discomfort despite taking on more fuel than he has in past races. Looking ahead to Unbound Gravel in a couple months, Jonny plans to further refine his fueling. He reported some extended periods without fueling and then having to take larger doses of gel than he wanted. To help fuel more consistently, he could explore other carbohydrate setups particularly for a more technical course (likely with the help of PF 300 Flow Gel in Flow Flasks).

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.

Jonny901mg/L
Jonny 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.

Whilst Jonny’s losses are on the moderate side, getting his hydration strategy right is still important if he wants to perform at his best.

Learn more
Pre-loaded electrolytes
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T - 60mins: Drank ~500ml of strong electrolyte drink
Fluid per hour
Recommended 250-750ml/h
~431
ml
Sodium per litre
Recommended 700-1100mg/L
~793
mg
Jonny's Hydration Rating
8
/10
"I’ve never monitored it so rigorously in a race before, but doing so definitely paid off. I could probably do with considering temperatures and drinking more when the heat gets up."
Our thoughts

As a member of the PF&H Marketing Team, Jonny is well aware of his sweat sodium concentration (901mg/L) thanks to a Sweat Test. He matched the concentration of his intake to his losses to help maintain fluid and electrolyte balance by using PH 1000 across the first four hours of the ride before switching to plain water and Electrolyte Capsules (having 2 per every 500ml water bottle). He stuck to his plan of drinking ~500ml of fluid per hour, which he felt was sufficient for much of the ride and supported his performance. However, as temperatures rose, Jonny acknowledged he could’ve increased his fluid intake. He also didn’t pee during the 11 hours he was on the bike, which may indicate underdrinking and a bit of dehydration. Ahead of Unbound, Jonny should perform some sweat rate data collection, both in controlled conditions like in the Precision Performance Lab, and out in the real world, to get a picture of how his sweat rate varies in different environments and therefore how much he should be drinking under varying race conditions.

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
Total caffeine
0
mg
Our thoughts

Jonny chose not to use caffeine during the event, as he hasn’t noticed a clear benefit from it in the past and was mindful of the potential negative side effects. That said, as a regular coffee drinker with a good caffeine tolerance, it’d be worth trialling a strategic caffeine dose through PF 30 Caffeine Gels in training ahead of future races. Caffeine is a well-researched ergogenic aid with a strong body of evidence showcasing its performance-enhancing effects for endurance exercise.

How Jonny hit his numbers

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

Jonny's weapons of choice

Final thoughts

Jonny's Satisfaction Rating
7
/10
My fueling and hydration were good, but my cycling effort across the race was not consistent.
Jonny
Jonny executed his most meticulous fueling and hydration strategy for what was his longest race yet. This supported his performance throughout the ride and gave him valuable insights to carry forward as he builds towards the more technical and humid Unbound Gravel race in Kansas. Jonny should focus on refining the timing of his fuel intake and continue to train his gut in practice, as well as collect some sweat rate data to help him prepare for adjusting his fluid intake to match his sweat losses in changing race conditions.
PF&H

Jonny's full stats

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?
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Overall
957g total carb
82g per hour
5,000ml total fluid
431ml per hour
3,967mg total sodium
342mg per hour
793mg
Sodium per litre

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.

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