Olli-Pekka Nuuttila is a doctoral researcher at the University of Jyväskylä. In this interview we discuss his recent study comparing two-week blocks of either increased volume (70% increase over baseline) or increased intensity (5 interval sessions per week), and how the findings can be applied in the real world.   IN THIS EPISODE YOU'LL LEARN ABOUT: -How does a two-week block of volume or intensity impact performance (3000m running time trial), subjective markers of recovery, and hormonal/biomarkers of recovery and stress? -The impact of adding a recovery week after a two-week focused block on volume or intensity -Individual variations in response and non-responders or trivial responses -When and how to incorporate volume blocks or intensity blocks in your training SHOWNOTES: https://scientifictriathlon.com/tts327/ 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.  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: Olli-Pekka's Twitter and ResearchGate Physiological, Perceptual, and Performance Responses to the 2-wk Block of High- versus Low-Intensity Endurance Training - Nuuttila et al. 2022 Acute Physiological Responses to Four Running Sessions Performed at Different Intensity Zones - Nuuttila et al. 2020 A Scientific Approach to Improve Physiological Capacity of an Elite Cyclist - Ronnestad et al. 2017 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.