Downhill Running Science: Eccentric Loading, the Repeat Bout Effect & Descending Technique

Email us your listener questions or hot or nots at microcosmcoaching@gmail.com.Check us out online at microcosm-coaching.comDownhill running is a technical skill, not a fitness problem, and this week Zoë Rom and TJ David break down the science of eccentric loading, the repeat bout effect, and how to descend faster without trashing your quads. They go inside the muscle to explain what actually happens to your sarcomeres on a long descent, why delayed onset muscle soreness peaks a day or two later instead of immediately, and why force output can stay down for up to a week even after the soreness clears. From there it's the practical stuff: how braking multiplies eccentric load, why sitting back is the single most common descending error, how to train your eyes on technical terrain, why fear itself makes descending harder, and where strength work genuinely helps versus where it can't replace actual practice. Plus Hot or Not on blood donation for endurance athletes, the red blood cell and iron math every runner should understand before donating, and how to time it around a race build, and random race pacers. In the listener question, a runner training for their second 50 miler on seven hours a week asks whether elite ultra training is fundamentally different from everyone else's. Short answer: same recipe, different dose. The episode opens with training through summer heat, racing amid wildfire uncertainty, and why holding your goal race lightly is a useful gut check.