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Lauren Puretz

Lauren Puretz

Ram Party Ultra

17th May, 2025USAColorado Springs1st, FPRO

Lauren's headline numbers

~77g
Carb per hour
Recommended 90g/h+
~250ml
Fluid per hour
Recommended 250-750ml/h
~1,901mg
Sodium per litre
Recommended 800-1200mg/L
~4.1mg
Caffeine per kg
Recommended 3-6mg/kg

Lauren'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

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 90g/h+
~77g
Lauren's Energy Rating8/10

"I had no cramp or bonks and no GI issues. "

Our thoughts

Even though Lauren consumed ~385g of carbohydrate across 5 hours of racing, this averages out to be below the recommended 90g/h. Increasing this intake, even just by 10g/h, could be helpful for Lauren’s energy levels and further reduce the risk of bonking. The altitude and intensity may have suppressed her appetite slightly, so having a structured plan will be imperative in order to make sure she can stick to consistent fueling at similar races. During this race, her carb sources came from a mix of products she’d trained with, including some gels and drink mixes. The variety likely helped avoid flavour fatigue through different textures and flavours, another key factor she can take into her next race.

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.

Lauren1044mg/L

Lauren has been Sweat Tested to dial in her 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 Lauren's losses are on the moderate side, getting her hydration strategy right is still important if she wants to perform at her best.

Learn more
Pre-loaded electrolytes

T - 60mins: Drank ~500ml of strong electrolyte drink

Fluid per hour
Recommended 250-750ml/h
~250ml
Sodium per litre
Recommended 800-1200mg/L
~1,901mg
Lauren's Hydration Rating5/10

"I should have stopped to refill my flasks but I didn't feel dehydrated or hot at any point. With the gusts of wind and water at aid stations I was able to stay cool throughout."

Our thoughts

Lauren knew from her Sweat Test that her sweat sodium concentration was moderate, and although race conditions were dry, the elevation and gusty winds increased her risk of fluid losses. She adapted by appropriately preloading with a high concentration of sodium before the race and using a strategic electrolyte plan during the event, relying on a combination of drink mix and electrolyte capsules. Although her sodium intake was sufficient to compensate for her sweat losses, her fluid intake was on the low side and she recognised this post-race, noting she should’ve refilled with fluids more throughout. This combined with missing a planned refill of her bottle meant that the relative concentration of sodium of the fluid she *did* consume was higher than planned. Thankfully, she was able to use some cooling strategies at an aid station to keep her core body temperature in check and prevent any further negative impacts of dehydration.

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

T - 0-4hrs: Had a final hit of caffeine

Caffeine per kg
Recommended 3-6mg/kg
~4.1mg
Our thoughts

Lauren used just over ~200mg of caffeine, between two PF 30 Caffeine Gels and a pre-race coffee. This put her comfortably within the recommended range of 3–6mg/kg for performance benefits. Importantly, this was a protocol she had practiced and tolerated well ahead of time, and she reported no jitters or side effects. Instead, she felt mentally alert throughout, especially in the latter stages.

How Lauren hit her numbers

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

Before race (>30 mins)
  • 1 x Waffle
  • 1 x Cup of coffee
  • 1 x Cup of water
  • 1 x Serving of sodium bicarbonate
Pre-race (<30 mins)
During

Final thoughts

Lauren's Satisfaction Rating8/10

I felt like I was stuck in cruise control, like I could go faster but couldn't get into that gear. But I still ran my goal time so it wasn't that far off.

Lauren

Lauren returned to racing after a tough day in her last race at Black Canyon, and she did so with a bang, taking 33 minutes off the course record and claiming the win at altitude on a dry, dusty day in Colorado. Lauren demonstrated how a practiced, well-calibrated nutrition strategy can support consistency and confidence on race day, especially in tough terrain and high-altitude conditions. To build on this, Lauren could look to increase her carb and fluid intake slightly or plan a mid-race refill point if future races are hotter and/or longer.

PF&H

Lauren's full stats

Overall
385g total carb77g per hour
1,250ml total fluid250ml per hour
2,377mg total sodium475mg per hour
1,901mgSodium per litre
200mg total caffeine4.1mg per kg

Data Confidence

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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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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