/

Hattie Harnden

Pro

Enduro MTB British Championships

18th August, 2024
Scotland
Forest of Ae
1st, FPRO
Cycling, Mountain bike - 35km
16°C
, Mild
4hrs 20mins
more race details

Hattie's headline numbers

?
?
?
~47
g
Carb per hour
Recommended 60g/h
~346
ml
Fluid per hour
Recommended 250-750ml/h
~1,040
mg
Sodium per litre
Recommended 700-1100mg/L
~3.1
mg
Caffeine per kg
Recommended 3-6mg/kg

Hattie'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)
Didn't pre-fuel
?
Hattie would benefit from taking in a final dose of carb <30 minutes before
Carb per hour
Recommended 60g/h
~47
g
Hattie's Energy Rating
9
/10
"My energy was a bit lacking early on, but once I got going it was really stable. I never felt hungry, but towards the end I was thinking about eating as I hadn't eaten any 'real food' for a while."
Our thoughts

For this multi-stage race, Hattie rode for four and a half hours, with five timed technical downhill sections throughout. She focused on fueling the day before with high-carb foods like rice, pasta and some sports nutrition products. Then, during race day she took small, frequent doses of carb to top up her circulating glucose levels. Since Hattie’s intake fell below the general recommendations of ~60-75g per hour for a race of this duration and intensity, she has room to improve this part of her strategy. The logistics of this race, including frequent technical sections and some stop-start points, necessitated easily digested carbs like sports nutrition products, so Hattie could increase her intake by incorporating more of these. She could also consider taking a PF 30 Gel or Chew immediately before the gun goes off to boost her energy levels, helping to kickstart her fueling strategy and prevent the slow start she experienced.

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.

Hattie880mg/L
Hattie 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 Hattie’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
Didn't pre-load electrolytes
?
Drinking a strong electrolyte drink before the race could have helped Hattie start optimally hydrated
Fluid per hour
Recommended 250-750ml/h
~346
ml
Sodium per litre
Recommended 700-1100mg/L
~1,040
mg
Hattie's Hydration Rating
8
/10
"It was really humid which made me really thirsty, but I was able to fill up my bottles a couple of times at the pits so it never really bothered me."
Our thoughts

Hattie isn’t a very heavy sweater and has only moderate sodium losses, so whilst it was humid on race day in Scotland, she didn’t feel like her sweat losses were excessive. She managed to drink frequently and refill her bottles twice during small breaks, using PH 1000 (Drink Mix) and some PF Carb Only Drink Mix to maximise ‘bang-for-buck’ in her bottles. This likely replaced a large enough proportion of her sweat and electrolyte losses and helped her avoid any effects 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
~3.1
mg
Our thoughts

Hattie missed her pre-race coffee so decided to take some caffeine gum shortly before the race began to have the stimulant circulating in her blood. Along with a mid-race top up using a PF 30 Caffeine Gel, she achieved the minimum effective dose to obtain performance benefits including increased focus, giving her the edge on the technical timed sections by minimising mistakes whilst at high speeds.

How Hattie hit her numbers

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

Hattie's weapons of choice

Final thoughts

Hattie's Satisfaction Rating
10
/10
I think I rode really well, and physically I couldn't have given any more. Considering in this style of racing it's normal to crash a few times, I only hit the deck once so I'm pretty pleased!
Hattie
Hattie secured her 17th (!!!) national title, and her first in the Enduro category since she began bike racing in 2014. Her fuel and hydration strategy has been improved greatly in recent months, but she still has some areas to work on to further support her performance. Taking a pre-race carb hit, and stuffing her jersey pockets with some extra Gels or Chews will help prevent the slow start she had on race day.
PF&H

Hattie's full stats

?
?
?
Overall
204g total carb
47g per hour
1,500ml total fluid
346ml per hour
1,560mg total sodium
360mg per hour
1,040mg
Sodium per litre
200mg total caffeine
3.1mg 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.
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.

Hattie's recent case studies

see all
Nail your next event with a FREE Fuel & Hydration Plan
Get started