Kyle Smith
Challenge The Championship
Kyle's headline numbers
Kyle'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.
Kyle averaged a similar hourly carb intake in Samorin as he did during his previous middle-distance race in Singapore, but his execution was quite different. His total bike intake was ~44g higher for a similar duration, so his average intake was ~153 grams per hour (vs ~131g/h in Singapore). Following a similar trend to most of our triathlon case study data, Kyle’s intake was ~27% lower during the run. This still gave him enough energy to run his fastest ever half marathon ‘off-the-bike’, and one of the fastest middle-distance triathlons ever. Kyle’s clearly spent a long time training his gut to tolerate this very high intake, which supports the emerging scientific literature that highly trained athletes can tolerate >120g/h of carbs.
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.
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 Kyle’s losses are on the low side, getting his hydration strategy right is still crucial when it’s hot and/or humid as his higher sweat rate in these conditions can result in significant net losses over the duration of a race.
Learn moreKyle has a very low concentration of sodium in his sweat as you can see from the graphic above. But we also know he loses large volumes of sweat when racing at a high intensity, based on several sweat rate tests he’s conducted in training under similar environmental conditions. Because of this, fluid replacement is a high priority for Kyle compared to some of his peers. Along with his impressive tolerance of carbs, Kyle has also trained his gut to tolerate high amounts of fluid intake per hour.
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.
As a frequent caffeine user, Kyle’s tolerance to the stimulant is likely quite high. So, by taking four PF 30 Caffeine Gels strategically across the race (one ~10 minutes pre-swim, two during the bike and one early on the run), Kyle could maximise his blood caffeine levels at all times to lower his perception of effort. This is a staple part of his strategy, and something we’ve seen him execute several times without issue, so we wouldn’t recommend any changes going forward.
How Kyle hit his numbers
Here's everything that Kyle ate and drank on the day...
Kyle's weapons of choice
Final thoughts
Kyle's full stats
Data Confidence?
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.