Is Exercise for Weight Loss a Waste of Time? / Doping Convictions, Conundrums and Coital Contaminations / Heat Stress Hacks

Discourse

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Show notes

In this Spotlight, we kick off with three doping stories in Discourse Digest. Ruth Chepngetich got a three year ban, up from two, then down from four, and keeps the marathon world record nobody believes in. We discuss why her case is so frustrating for sport. Imogen Simmonds has been cleared to compete despite an Anti Doping Rule Violation, after she convinced a panel that her positive test was the result of contamination by her partner during intimate contact. And Oier Lazkano has been provisionally suspended by the UCI for athlete biological passport (ABP) abnormalities that date back to 2022. Ross explains the biological passport principles, why a suspension based on the ABP is so rare, and why it might have taken this long to bring the case against Lazkano.

In Centre Stage (42:23), two papers on metabolic costs of exercise were published last week, with contradictory findings. We first explore a paper that proposes a metabolic limit of 2.5 our basal metabolic rate, and where that study fits into our understanding of exercise and metabolism. Then we consider another paper that contradicts that understanding by refuting the idea that our bodies constrain certain metabolic functions when we exercise in the equivalent of what Ross calls 'physiological austerity'. We try to explain why these studies contradict one another, the importance of energy balance in metabolism, and why there's a bit of truth in both models on opposite sides of the issue.

Our Listener Lens (1:10:12) is inspired by a question from Leon, who asks about using heat as a way to increase cardiovascular stress without overloading his legs. We discuss how heat may be beneficial even without that cardiovascular benefit, why HR may not be the best metric to judge intensity against, and how the approach might be a handy hack, but only part of the approach with a few words of caution.

And Finally (1:20:52), Gareth wonders whether the sub-2 hour marathon is more impressive than the sub-11 hour 100 mile record?

Links

• Sean Ingle's article on Nike's new shoes
• Article interviewing Pontzer about the constrained model
• The Pontzer study on ultra endurance athletes and the metabolic ceiling
• The study that disputes Pontzer's constrained model, arguing instead for an additive effect of exercise
• A discussion on X that eventually brings two authors together to discuss the contradictory findings
• A comment in Nature on the debate and an attempt to find some middle ground

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