McCutchen going sub-5 and improving his Ironman bike split by more than 10 minutes in just 12 months

Going sub-5 for the bike leg of an Ironman is a true milestone. Getting even faster after this benchmark is clearly harder, but not impossible. Just look at age–grouper Matthew McCutchen (47) from Aliso Viejo, California.

McCutchen is a good example of a triathlete who qualified for IRONMAN Kona, using INSCYD. He’s a married stay-at-home dad with two kids who improved his Ironman bike split by more than 10 minutes in just 12 months.

He started to work with triathlon coach Joby Gutierrez of FC Endurance (an INSCYD licensed coach based in Orange County, California) in 2014 after a year off from racing. Since then he has qualified for the Ironman World Championships three times in a row: in 2015, 2016 and 2017 (with a fourth qualification back in 2012 when he was used to train with Purple Patch).

McCutchen raced at Ironman Texas in both 2017 and 2018, with IM Texas 2018 being his 100th triathlon and his 19th IM race overall. Last year he clocked 4:56:46 for the bike fragment, while this year he finished the same course in 4:43:09. A staggering 13 minutes faster!

If you’ve read something about this year’s IM Texas, and look at the McCutchen’s bike split, you may be tempted to think “oh, yeah, but IM Texas this year was cursed with a huge drafting problem!”. That is why you should also look at his power file in order to have a full picture of his performance.

Comparing the power files

If you look at the watts that McCutchen averaged in both circumstances, you get a better insight into his race day achievement. Last year McCutchen completed the IM Texas course with a normalized power of 221 watts, while this year his normalized power was 231 watts. That’s exactly 10 watts more this year. That is a big improvement and it should be read as: the 2018 faster bike split came from his own body and not from drafting (otherwise the wattage would have been lower). And there’s no doubt that the use of INSCYD over the last eight months gave his coach an extra and powerful tool to boost his performance.

Coach Joby Gutierrez and INSCYD

Joby Gutierrez started to use INSCYD (both on himself and on his athletes) in September 2017. He tested McCutchen with a Critical Power protocol 18th  September, a little less than a month before the Ironman World Championships, which was held 14 October. McCutchen had qualified for his first World Championships at the now-defunct Ironman New York (2012) and back-to-back at Ironman Texas for the 2015, 2016 and 2017 editions of the IM World Champs. From 2015 he averaged 13 hours of training per week.

In the first test performed in September, McCutchen (117 cm for 76 kg) showed a pretty high VO2max for an age grouper (58 ml/min/kg). Giving the results he already achieved through his triathlon career (he completed his first race, an Olympic distance, in Los Angeles in 1995), that was no surprise. His VLamax, on the other hand, was a bit high (0.45 mmol/l/s); therefore, in order to perform in endurance events at his full capacity and improve even at an already high level, the main goal for Gutierrez was to lower VLamax.

Coach Gutierrez: “My goal for Texas was to keep the VO2max at the same level and just lower the VLamax. So I modified some of his training to achieve that. And that brought him from 0.45 to 0.25 which at his race intensity allowed him to be less dependent on additional carbohydrates.”

As in all competitions lasting several hours, one limiting factor is nutrition, specifically the amount of carbohydrates one could take in during race.

With INSCYD you can easily see how training changes your metabolic performance

Adjusting carbohydrate combustion and intake

The new training schedule that Gutierrez planned after McCutchen’s first test in September targeted a specific reduction in carb combustion. McCutchen utilized 415 kcal carbohydrates per hour in September 2017 at the given power output of 230 watts. This equals 99 gram of carbohydrates per hour. The second test – performed in March 2018 – showed a total utilization of 324 kcal/h (equal to 77.5 g/h) at the same power output. In other words, he needed less carbohydrates for the same amount of power.

Learn how to create your own fueling and pacing plan, using carbohydrate combustion rates, read this article (free whitepaper available)!

At the same time, McCutchen improved his ability to use fats as a fuel, going from 425 kcal/h up to 561 kcal/h during the same tests and at the same power output. With the combination of the improved use of fats and the reduced use of carbs, his stomach distress was resolved and his ability to stay in the FatMax/aerobic zone improved over the course of only 3 months. Although McCutchen was first tested in September, raced in Kona in October and also in Ironman Arizona in November, he then had an off-season until the end of December and started the new training structure in January.

How they reduced VLamax

In between, a little re-tune of his “grinder routine” after the first INSCYD test was the way to reduce his VLamax. “Big-gear work has always been a big part of his training,” says Gutierrez. “But I reduced the amount of big-gear workout above threshold intensity, and I reduced the intensity of his big-gear work closer to his threshold. I wanted his big-gear work stay at around steady-state and not increasing the accumulation of his lactate. But we also did big-gear work at the upper-end of his Fat-Max zone with longer duration (15-20 minutes). We also made sure that on his weekend rides he wasn’t going anaerobic in any of his effort. And if it was, it was very short in duration.”

Do you want to know more about your VLamax and how to reduce it and perform better in long-distance events? Start training for real, start using INSCYD!

For coaches and labs

Watch Inscyd in action

With INSCYD, you can tailor training programs with unparalleled precision, ensuring your athletes achieve their peak performance faster and more efficiently.

Don’t let your athletes settle for anything less than their absolute best. Book a Free Demo with INSCYD today and experience firsthand how you can elevate your coaching game.

Joby Gutierrez

Joby Gutierrez started to use INSCYD (both on himself and on his athletes) in September 2017. Joby takes a unique approach to training – preparing athletes for the physical endurance and mental perseverance needed to excel. Learn more about Joby and his work here: FC Endurance

Related Posts

INSCYD partner Velocity

INSCYD PARTNERS WITH VELOCITY

Velocity is a new performance-driven indoor cycling app that is designed to make cyclists faster by customizing their training to their physiology. To accomplish this, Velocity will leverage INSCYD’s proprietary software and comprehensive experience with elite athletes to provide riders with their unique metabolic profile. Readers may think of Zwift when hearing “indoor cycling app”,…

Read more
Aya Sinay testing triathlete

3 Tips For Triathlon Coaches – From an IRONMAN Kona Coach

Aya Sinay has raced as a triathlete in IRONMAN Kona (Hawaii) twice and has been a successful triathlete coach for over 10 years. In this article, she shares 3 important tips that all triathlete coaches should read. Get ready to boost your athletes’ performance and your coaching business. Spread the knowledge! Share this article with…

Read more
INSCYD coach Tenille Hoogland

How women can train and fuel for their unique physiology

Lift heavy is the number one tip that all female athletes in perimenopause and beyond can take on to stay strong and play to their best. Eat more protein is another. But what about those endurance goals that we love training for? How do you balance “going long” with doing strength and intensity? How do…

Read more
INSCYD test. Partner: Triathlon Training Academy

INSCYD test: protocol, results, cost and more.

This article covers everything you need to know about the INSCYD testing protocols, test results, testing cost and many more. Let’s start by addressing a common misunderstanding. Image: INSCYD partner Triathlon Training Academy Before we can dive into the INSCYD test, we have to understand what INSCYD is. INSCYD is a software tool that allows…

Read more

The Future of Cycling Training: Insights from Former Pro Cyclist

Together with former professional cyclist and INSCYD user Peter Pouly, we talk about the future of cycling training and how that affects endurance coaches and their business. Peter is a former professional cyclist (5x National Champion Cross-Country Mountain Bike, 5x winner Haute Route Alps, 1x winner La Marmotte) and now works as a Directeur Sportif for…

Read more