Daniel Muniz, PhD, is a senior lecturer at the University of Hertfordshire. Some of his recent work involves big data analysis (from Strava) of marathon runners, where Daniel and his co-authors set out to explore how decoupling (changes in the ratio of internal to external workload, like heart rate to pace) can be an important parameter in marathon (and possibly broader endurance) performance.     IN THIS EPISODE YOU'LL LEARN ABOUT: -What does decoupling mean and how can it be calculated?  -How a lesser degree of decoupling is associated with better marathon performance -What are the physiological underpinnings of decoupling?  -What do we know about training interventions to reduce decoupling?  -Is decoupling independent of other markers of performance (like Critical Speed) or can it be improved by improving more traditional markers of performance?  -Using big data from Strava to calculate Critical Speed based on training data only SHOWNOTES: https://scientifictriathlon.com/tts343/ SCIENTIFIC TRIATHLON AND THAT TRIATHLON SHOW WEBPAGE: www.scientifictriathlon.com/podcast/ SPONSORS: ROKA - Exceptional quality triathlon wetsuits, trisuits, swimskins, goggles, performance sunglasses as well as prescription eyeglasses and sunglasses.  Online vision test for prescription updates and home try-on options available for eyeglasses. Ships from the US, UK and EU. Trusted by world-leading athletes such as  Lucy Charles-Barclay, Javier Gómez Noya, Flora Duffy, Morgan Pearson, Summer Rappaport and others in triathlon, cycling, speed skating, and many more. Visit roka.com/tts for 20% off your order. ZEN8 - The ZEN8 Indoor Swim Trainer is a one of a kind swim bench for time-crunched triathletes looking to improve their swim technique, power and propulsion, and consistency of swim training. It is very affordable, about the price of a pair of running shoes, and Zen8 offer free shipping in the US and the UK. Best of all, you can try it risk-free. If you don't love it after two weeks, send it back and get a full refund. Get 20% off your order at zen8swimtrainer.com/tts. LINKS AND RESOURCES: Daniel's profile on Research Gate and Twitter Decoupling of Internal and External Workload During a Marathon: An Analysis of Durability in 82,303 Recreational Runners - Smyth et al. 2022 Calculation of Critical Speed from Raw Training Data in Recreational Marathon Runners - Smyth et al. 2020 Durability in endurance sports with Ed Maunder, PhD and Stephen Seiler, Phd | EP#295 The Importance of ‘Durability’ in the Physiological Profiling of Endurance Athletes - Maunder et al. 2021 RATE AND REVIEW: If you enjoy the show, please help me out by subscribing, rating and reviewing: www.scientifictriathlon.com/rate/ CONTACT: Want to send feedback, questions or just chat? Email me at mikael@scientifictriathlon.com or connect on Instagram, Facebook, or Twitter.