Fatigue resistance: the number that predicts your race
Two equally fit athletes, completely different races. Here's what separates them.
TheFeed promotes the concept of fatigue resistance, a measure of an athlete's ability to maintain effort late in a race. The company highlights the work of David and Megan Roche, who have developed a field test to calculate a fatigue resistance number that can predict long-race performance. This number is trainable, with increased carb intake being a key lever to improve it.
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Everywhere in endurance sports right now, people are talking about fatigue resistance — and for good reason. It's a rare, relatively new idea: the one that explains why two equally fit athletes can have completely different races at mile 20.
Nobody has done more to define, measure, and prove it than David and Megan Roche. David rewrote the Leadville record book with it.
What is fatigue resistance?
Fatigue resistance is your ability to hold your effort — pace, power, output — late in a race instead of feeling it compromised.
You can think of fatigue resistance as the gap between what you can do fresh and what you can do three hours in.
The Roches built a simple field test around it over a decade ago — run moderate for 90 to 120 minutes, then go hard for 10 minutes, and compare that effort to what you can do fresh.
The offset between the two is your fatigue resistance number, and they've found it can predict long-race performance better than almost anything you can measure while rested.
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