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A Spotlight dedicated to the news, as we split the Spotlight show into a news segment and a science segment. Today is the news segment, which covers:

• 3:02 A look back at the New York City Marathon, won by Kenyans Hellen Obiri in a course record, and Benson Kipruto in a photo finish. We talk pacing micro-adjustments, late end spurts and misjudged fatigue and sprint finishes
• 17:44 Joe Klecker ran a 2:10 in NYC, but caught our eye because he planned to take in 175 g per hour of carbs in the form of almost 3 L of fluid. An insanely high intake, but one that he discussed in a recent podcast with The Coffee Club. We talk about that strategy, his experience of it, and how it fits in the new carbohydrate paragigm
• 35:22 WADA are making moves to consider banning Ozempic and drugs like it. Gareth and Ross discuss whether WADA are over-reaching, or whether they need to pay attention to the possible impact of the weight loss drug in sport, with Ross expressing doubts that it has long term performance benefits given how it works
• 44:53 Elite athlete Laura Hottenrott recently raised concerns about the frequency of blood testing doping controls she has been subjected to. We discuss whether that concern is legit, and whether performance might be harmed as a result of frequent blood sampling for doping control?
• 53:00 Gareth wonders how you could go about establishing who the greatest sporting nation in the world are? We discuss how you might weight sporting events and figure out who the ultimate all-round sporting champion is
• 57:27 Gareth's gears are grinding at the short short list for women's track athlete of the year - Femke Bol and Sydney McLaughlin Levrone, neither of whom had the seasons that Melissa Jefferson Wooden or Beatrice Chebet had. We wonder why the better performing, more regularly racing athletes got snubbed?

Links

• The Coffee Club interview with Klecker. It's cued to start on the carbohydrate discussion
• WADA has its eyes on Ozempic - the article with quotes from WADA on the possibilities of banning the drug

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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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In this week's show, we tackle intriguing physiological questions raised by listeners, explore whether different types of exercise interfere with one another to undermine training benefits, and run the Spotlight across stories from the sports world.

In Digest this week (10:02):

• One of the great swimmers of the last decade, Ariane Titmus, has retired in her prime, leaving us to ponder the difference between athletes who go early and those who hang on. And cynically, those who switch to The Enhanced Games, which this week announced another former Olympian to its ranks. We discuss the carrot of the Enhanced Games, and how it capitalizes on incentives to entice athletes to join the movement
• We wonder whether tennis players are playing too much, and whether the data support claims made by players like Taylor Fritz, who believe a combination of the calendar, courts and balls are threatening their welfare?
• In doping, 21% of athletes competing for Great Britain at the Commonwealth Games admitted to doping in the previous twelve months. That's only slightly better than the results of the same survey in Spanish athletes, which put the figure at 36%. Ross and Gareth discuss why the true figure is likely higher, and what it means for doping and anti-doping's effectiveness

Our Center Stage topic (45:19) is a paper that explores a phenomenon called "the interference effect", where different types of exercise aimed at endurance or power/strength, have been thought to cancel each other out, undermining the adaptations from training. We explain the origins of that theory, and explore why things are not necessarily as simple as they seemed, with some practical advice for all those who like to mix their training types.

In Listener Lens (1:08:33), Ali Robinson showcases what Discourse has to offer, making a fantastic observation about our most recent guest, cyclist Andrew Feather, and his physiological capacity. He introduces us to concepts of anaerobic capacity, or the W prime, and Ross explains how we can all use this concept (runners too!) to understand our performance limits, and design effective interval training sessions, including a challenge to Gareth to test his capacity and design training.

And Finally, we introduce a paper on a metabolic ceiling that limits endurance athletes, with a promise to explore it in a future Spotlight edition

Show notes

• Taylor Fritz shares views on load in tennis in an X exchange with fans
• Tennis website with data on rally length and ace rate
• Surveys reveal a minimum prevalence of doping in athletes
• The original WADA investigation on doping prevalence, 2011
• Our Center stage paper - the interference effect for power and endurance training

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Show notes

This week on Spotlight, we dive DEEP into the world of physiology, pacing, fatigue and the brain. Using some enthralling races from Kona and Chicago at the weekend, and your Discourse questions and comments, we explore how pacing 'errors' happens, and the physiological consequences of those mistakes. We kick off of with our Discourse Digest segment (00:00) and news that Femke Bol will take a swing at the 800m next year. An exciting development, but what will it involve in terms of training and tactics, and what can we expect from the Dutch star?

We then move on to the Chicago Marathon (15:56), won by Jacob Kiplimo, emerging as a real star of the Marathon. His success contained a very specific type of "failure" though, as he was on course to break the World Record right up to 35km, and then...physiology hit. Ross explains how fragile pacing is for elite marathoners, and why physiology collected on its 'loan' for Kiplimo. Another physiological "failure" happened in the Kona Ironman (29:26) where Lucy Charles-Barclay and Taylor Knibb raced so aggressively that they first rode and then ran each other to the point of proverbial physiological destruction. We explore how pacing in the context of a warm day caused those dramatic scenes.

In Centre Stage (44:57), it's all about the carbs. Tim Noakes has a paper arguing that you need only 10g/h of glucose during exercise. He uses his "Central Governor" model to explain how the brain is monitoring and regulating blood glucose level to protect the brain, such that the 90g per hour or more being consumed by elites is wasteful and unnecessary, part of an 'old model'. We don't see it the same way, and Ross explains concepts of regulation of performance by the brain, a subject he did his PhD thesis on. We discuss heat, altitude, and fuel, to unpack how the truth behind fatigue, performance and pacing regulation, unlocking more insight on those pacing implosions in Chicago and Kona.

In Ross Replies (1:06:59), listener Ian asks a great question about using data from a specific test where you lie down then stand up, and use HR to tell you how recovered you are. Ross explains why that test exists, its limitations, and offers tips for how to make more of data, while avoiding some traps.

And Finally (1:21:31), we see again that cycling is allergic to the truth, Gareth learns the truth about NZ Rugby Representation, and we tip our hats to Natalie Grabow.

Links

• A race report from that dramatic Kona women's race
• The full Taylor Knibb statement
• The Noakes Tweet
• Ross' PhD thesis on Anticipatory Regulation
• Article on orthostatic testing for HR and HRV
• The Six who Sat podcast that Gareth mentioned on the show

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Show notes

It's a Bro-Science discussion today, as listener David inspired debate with a post on his epic Zone 2 indoor ride, and got us thinking - how do we spot Bro Science? Is it all bad? What are the alarm bells that should make us cautious, and how can we learn from the experiences and anecdotes of other people while staying credible. That's our Center Stage topic (47:45).

Before that, we whip around the world for a Discourse Digest (1:38) that looks at NCAA 'trafficking' in Kenyan athletes, a win-win, but also maybe a loss for some. We talk Caster Semenya's off-now-on case to fight for inclusion into women's sport, and explore why it's about male advantage, not natural advantage. We also visit rugby, where head impacts and concussions are the focus of a big new study, a new player load guideline, and a link with neurodegenerative diseases in the wake of sad news of Lewis Moody's MND diagnosis.

In Ross Replies (1:05:45), Gareth asks about training when fatigued, inviting discussion about the body's physiological resource budget, and how we spend it on stress as opposed to recovery. Listener Lens (1:11:41) fields another listener question, this time from Gianni, about the importance, or necessity, of breakfast before training. And Finally (1:14:52), Tua Tagavailoa has been advised that to prevent concussions, he needs more carbs. It's an idea detached from both reality and theory, but we discuss how it might have come about, and how ideas without basis become entrenched by unquestioning media and public.

Link

• Chris Chavez post about NCAA Recruiting
• DW article on Semenya's legal case
• The entertaining LetsRun article on Tokyo 2025
• The large NZ study on neurodegenerative disease in rugby players
• World Rugby's Load Guidelines
• Former guest James Smoliga's article on Tua Tagavailoa's sugar-concussion prevention belief

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Join Discourse and contribute to the Spotlight, and join the conversation - a small monthly donation gets you membership to our community, and that allows you to drive discussion around these shows, and get even more value and insight from what other listeners are sharing.

Show notes

In Spotlight this week, we look back at a packed weekend of sports action and offer insights on the big events. We kick it off with the AFL (1:39), where the Grand Final was played, and where listener Josh sent in an article exploring how the body shape and size of players have evolved over the years. Gareth wonders whether the players adapt to the game, or whether the game adapts to the athleticism of its players, and Ross explains the physiological equivalent of 'form follows function'.

Then we move to Rugby (9:56), where England were crowned World Champions at the weekend, crowing an unbeaten World Cup cycle in which they've averaged 50 points a match and not lost a single match. The final wasn't exactly smooth sailing, and Gareth and Ross share some thoughts on what impressed us, and where Canada may have fallen short, with hopes for continued growth in the game.

From Rugby to cycling for a brief last look back at the Rwanda World Champs (23:10), but where off-bike news in the form of the UCI back-pedal on handlebar widths and other policy changes are the main focus of conversation.

Cycling gives way to golf (38:48), and the Ryder Cup, which looked like a foregone conclusion until it wasn't, and one of the year's great sports spectacles unfolded in New York. We learn how Europe used data analytics and simulations to optimize its foursome and fourball combinations, and wonder when data becomes a hinderance as opposed to a helper in sport?

In response to a spate of serious ACL injuries in the NFL and in football (51:58), Gareth wonders whether something is happening, perhaps related to the training and conditioning of athletes, or the turf, to increase ACL injury risk? Ross is less sure, explaining how rare injuries can throw up misleading 'patterns', compounded by media bias.

We wrap up with some doping stories (55:52), including the CAS decision in the case of Erriyon Knighton, who was initially cleared of doping when he was able to show contamination of an oxtail meal he consumed. But CAS didn't see it the same way, and he got a four year ban because of their interpretation of the pharmacokinetics and the relative levels of the banned substance in the oxtial compared to in his urine. We also go to Kenya, where an athlete admitted not only to taking EPO, but explaining how he obtained it. Whether it's a truthful account is anyone's guess.

And finally (1:03:16), the NFL came to (Dublin) town last weekend, and the juxtaposition of some high profile rugby players and the NFL kicked off a conversation comparing the two sports. We end with a semi lighthearted look at the helmet and pad culture of American Football, and offer thoughts on why rugby's lack of protective equipment doesn't necessarily make it more dangerous.

Links

• Taller, leaner, faster AFL players
• You can read the Knighton CAS decision here
• No Laying Up Golf Analytics Podcast

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The 2025 UCI World Road Cycling Championships in Kigali, Rwanda, delivered plenty of drama and debate, and SOS host Mike Finch was there to witness the action first-hand and ask if this was the best championships of the century. We also have the post-race interviews with the big stars and discuss whether Remco Evenepoel can really upset the two-time World Champion Tadej Pogacar at the upcoming European championships on October 5 and the season-ending Il Lombardia a week later.

***Join Discourse and contribute to the Spotlight, and join the conversation - a small monthly donation gets you membership to our community, and that allows you to drive discussion around these shows, and get even more value and insight from what other listeners are sharing.

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