Critical Oxygen

In this episode of the Critical Oxygen podcast, Dr. Robert Jacobs and I discuss how our bodies adapt to exercise. We explore the various cellular disturbances that are sensed by specific sensors and translate into intracellular signaling cascades that drive adaptation. The key themes covered include the importance of stress and adaptation, the specificity of exercise adaptations, energetic and mec...

In this episode of the Critical Oxygen podcast, Coach Aaron Geiser and I discuss the importance of recovery days and down weeks in training. We emphasize the need for individualized approaches and the importance of listening to your body. We also discuss the impact of motivation on performance and the dangers of pushing through lack of motivation. The conversation highlights the benefits of flexib...

In this episode of the Critical Oxygen podcast, hosts Philip Batterson and Jonah Rosner discuss the importance of fueling for running and the optimal carbohydrate intake for endurance athletes. We share our personal experiences with fueling during training and races, emphasizing the need for proper fueling to support performance and recovery. We discuss the recommended carbohydrate intake for diff...

In this episode of Fast Physiology on the Critical Oxygen podcast, I am joined again by Coach Dave Schell where we discuss sweet spot or gray zone training. We start by defining sweet spot training as high zone three to low zone four training, which is has been used to accumulate training stress for time crunched athletes while also improving performance. We explore the history of sweet spot train...

In this episode of the Critical Oxygen podcast, Coach Aaron Geiser and I discuss various recovery tactics beyond sleep and nutrition. We explore the benefits of cold plunge therapy, including improved sleep and mental toughness. Heat therapy, such as saunas and hot baths, may also aid in recovery and heat acclimation. Massage therapy and trigger point therapy are effective in releasing tension and...

This episode of the Critical Oxygen podcast explores the adaptation of mitochondria to exercise. I am joined by Dr. Robert Jacobs where we discuss topics such as the variability in measurements, challenges of wet lab work, dispelling the myth of mitochondrial biogenesis, different populations of mitochondria, hypertrophy of slow twitch fibers, the role of AI in education, and the importance of sea...

In this episode of the Critical Oxygen podcast, Aaron and I discuss the importance of recovery for optimizing athletic performance. We emphasize the role of sleep and nutrition in the recovery process, highlighting the need for adequate sleep duration and quality, as well as sufficient protein intake. We hosts also explore individualized recovery strategies and the use of tools such as cold plunge...

This episode of the Critical Oxygen podcast explores the importance of oxygen in human performance. Dr. Robert Jacobs and I explore the role of mitochondria in energy production, the transfer of electrons and protons, and the process of ATP synthesis. The relationship between oxygen and other energy systems, such as phosphocreatine and glycolysis, is also discussed. The episode highlights the need...

In this episode of Fast Physiology on the Critical Oxygen podcast, Dave Schell and I discuss the nuances and importance of zone two training. We start with a quick introduction of our new series - Fast Physiology, which is designed to dispel the myths surrounding training trends. We define zone two training as the intensity necessary to build volume over time and emphasize the importance of percei...

In this episode of the Critical Oxygen podcast, Coach Aaron Geiser and I discuss how to make indoor training fun. We acknowledge the boredom and monotony of indoor training, especially during the off-season, and share strategies to keep it engaging. We emphasize the importance of variation in cadence, elevation, power, and training modes to stimulate the mind and body. We also discuss the signific...

In this episode of the Critical Oxygen podcast, I am joined by Jason Fitzgerald, a world class running coach and founder of Strength Running. We discuss the importance of consistency and specificity in training, the balance between easy and hard workouts, and the role of VO2 max in endurance performance. We also highlight the principles of endurance training, including consistency, specificity, an...

This episode of the Critical Oxygen podcast explores the concepts of critical power and critical oxygenation. Dr. Robert Jacobs and I discuss the definition and measurement of critical power, including the limitations and variability of the measurement. We also introduce the concept of critical oxygenation and its relationship to critical power. The episode concludes with a discussion on the use o...

In this episode, Dr. Billy Sperlich and I discuss training intensity distributions and the use of wearables in endurance sports. He shares his background in exercise physiology and his interest in triathlon. Dr. Sperlich explains the challenges of defining training intensity distribution and the limitations of research in this area. He highlights the importance of individualization and regularly t...

In this episode of the Critical Oxygen podcast, Aaron Geiser and I discuss VO2max protocols and how to make aerobic development fun. We address misconceptions about VO2 max and the importance of individualized training. We also explore different breathing techniques that may be able to improve performance and discuss the various VO2max protocols available. In this episode, we discuss various aspec...

In this conversation, Dr. Robert A. Jacobs and I discuss his recently accepted paper on carbohydrate oxidation and performance in sub-2 hour marathons. We explore the role of fuel utilization, the impact of exogenous carbohydrate intake, and the limitations of respiratory exchange ratio (RER) as a measurement. We also discuss the importance of training the gut and the balance between carbohydrate...

In this episode of the Critical Oxygen podcast, Aaron Geiser and I answer listener questions about endurance development, periodization, and training in a fasted state. We discuss the importance of balancing volume and intensity in training, and how to structure a long training cycle. We also explore the use of heart rate and watts for training, and the benefits and considerations of training in a...

In this episode, I talk with Coach Sean Seale from Upside Strength. He discusses his background in coaching and how his approach has evolved over the years. We emphasize the importance of bridging the gap between science and training, and the need for coaches to understand the individual needs and preferences of their athletes. We also highlight the benefits of cycling as a training modality and t...

In this episode of the Critical Oxygen podcast, Dr. Robert Jacobs and I discuss exercise economy and efficiency. We explain the importance of zone two training for improving volume and intensity, and it's role in increasing economy. We define exercise economy as the amount of oxygen per wattage or unit speed and discuss its measurement challenges. We also explore the factors that affect econom...

In this episode of the Critical Oxygen podcast, I am joined by coach Michelle Simmons to discuss the intersection of science in coaching! We cover topics such as understanding thresholds and energy systems, the evolution of training and coaching, the role of lactate in training, fueling for performance, the myth of fasted training, carbohydrate and fat oxidation, the importance of being a hybrid a...

Welcome to the Critical Oxygen Podcast! In this episode Dr. Robert Jacobs and I talk about falling in love with exercise training and how it's helped us become better at what we do! Enjoying these podcasts? Don't forget to subscribe to get notified when new episodes are released. If you have a question or topic you want us to address, leave a comment! Follow Phil on Instagram - https://www...

Welcome to the Critical Oxygen Podcast! In this episode Dr. Robert Jacobs and I talk about the importance of skeletal muscle in predicting endurance performance. We focus on the significance of capillaries, myoglobin, and mitochondria in endurance performance, along with research comparing predictors of performance. Here is a link to my master's publication discussing predictors of performance...

This episode of the Critical Oxygen podcast discusses VO2max, the maximum amount of oxygen a person can uptake and utilize during exercise. Dr. Robert Jacobs and I provide a definition and historical context of VO2max, explaining its importance in determining aerobic potential. We then discuss the Fick equation and indirect calorimetry as methods to measure VO2max. The reliability and limitations...

This episode of the Critical Oxygen podcast discusses the concept of thresholds in exercise physiology. Dr. Robert Jacobs and I explore the confusion surrounding thresholds and the various ways they are measured. We also discuss the limitations of lactate testing and the disconnect between research and real-world application. The practical application of thresholds in training and competition is e...

In this episode, Dr. Robert Jacobs and I discuss the concept of thresholds in exercise physiology and the ongoing debate surrounding their existence. We explore the importance of understanding and measuring first threshold, which marks the shift from maximal fat oxidation towards carbohydrate oxidation during exercise. We discuss the challenges of accurately measuring thresholds and the need for t...

In this episode of the Critical Oxygen podcast, Coach Aaron Geiser and I discuss goal setting and how it impacts training. We emphasize the importance of setting SMART goals that are specific, measurable, attainable, realistic, and timely. We also discuss the difference between outcome goals and process goals, and how both can be effective in motivating athletes. We share our own personal goals an...