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Training Science PodcastAuthor: Paul Laursen & Martin Buchheit
Your hosts of the Training Science Podcast, Martin Buchheit and Paul Laursen, take a weekly deep dive into the real world application of training science in the trenches. Language: en-us Genres: Health & Fitness, Science Contact email: Get it Feed URL: Get it iTunes ID: Get it |
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Does Zone 1 Build a Stronger Heart Than HIIT? New MRI Data with Dr Guido Claessen & Prof Paul Laursen
Episode 202
Thursday, 19 February, 2026
Does high intensity training really build the strongest heart, or is it time in Zone 1 and Zone 2 that truly drives cardiac adaptation?In this episode, Dr Guido Claessen joins us to unpack a landmark longitudinal MRI study on endurance athletes that challenges common assumptions about HIIT and heart remodeling. They explore what actually builds the “athletic heart,” why low intensity volume matters more than most think, and what this means for polarized training.They also tackle the harder questions lifelong athletes worry about including atrial fibrillation, coronary plaque, myocarditis, and how much endurance sport might be too much.________________________Today’s speakers:Prof Paul Laursen https://www.paullaursen.com/ Dr Guido Claessen https://www.linkedin.com/in/guido-claessen-936a18a9/
