Louis Passfield, PhD, is an adjunct professor at the University of Calgary and also holds a professorship at the University of Kent. In addition to his academic work, Louis has been involved with British Cycling for several Olympic cycles, and worked with athletes and practitioners in high-performance sports. Much of his recent academic work has been centred around the quantification of training load, which is the topic of today's interview.  IN THIS EPISODE YOU'LL LEARN ABOUT: -Training Load overview: what is it, why do we want to measure it, and a brief history of training load metrics -The limitations and validity concerns of currently available training load metrics -Redefining the gold standard for quantifying training load -Suggestions for future work on coming up with valid and useful training load metrics -Advice for athletes, coaches and practitioners on use of training load metrics today SHOWNOTES: https://scientifictriathlon.com/tts341/ SCIENTIFIC TRIATHLON AND THAT TRIATHLON SHOW WEBPAGE: www.scientifictriathlon.com/podcast/ SPONSORS: Precision Fuel & Hydration - Optimise and individualise your fueling and hydration strategy using the free online Sweat Test and Quick Carb Calculator on precisionfuelandhydration.com. Book a free one-on-one consultation to chat with the team and refine your fueling and hydration even further. Listeners of That Triathlon Show get 15% off their first order of fueling and hydration products. If you didn't catch the discount code in the episode, email Andy and the team at hello@precicionhydration.com and they will be happy to help.  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. LINKS AND RESOURCES: Louis profile on Twitter and Research Gate and his email (right click and select "Copy email address") Validity of the Training-Load Concept - Passfield et al. 2022  Prior exercise impairs subsequent performance in an intensity- and duration-dependent manner - Fullerton et al. 2021 Cycling Performance and Training Load: Effects of Intensity and Duration - Kesisoglou et al. 2020 Continuous Versus Intermittent Running: Acute Performance Decrement and Training Load - Kesisoglou et al. 2021 Metabolic and performance‐related consequences of exercising at and slightly above MLSS - Iannetta et al. 2018 Lactate threshold with Mark Burnley, PhD | EP#330 VLaMax, Polarised training, Fatigue and Complexity with Mark Burnley, PhD | EP#331 Critical Power and VO2 kinetics with Mark Burnley, PhD | EP#257 Nitrate loading, marathons, and endurance sports science with prof. Andy Jones | EP#187 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.