Exercise Expert: The Workout That Reverses 20 Years of Aging

Six days before he sat down for this conversation, he ran a marathon. Then he explained what the race did to his brain. When you run 26 miles and your glycogen runs out, your brain still needs energy, so it starts stripping the fatty myelin off its own neurons and burning it for fuel. MRI scans caught a 20% drop in myelin up to two months after a marathon, and cognitive testing showed real impairment for about a month. In this episode, Louisa sits down with Brady Holmer, exercise physiologist, 2:24 marathoner, and author of VO2 Max Essentials, for one of the most practical conversations on aerobic fitness, brain health, and longevity the show has recorded. They cover why "marathon brain" is real but temporary, the menopause parallel where a starved brain catabolizes its own white matter, and whether pre-loading ketones or omega-3s can protect your myelin through a hard endurance effort. Then Brady breaks down VO2 max the way almost nobody does: not as a heart-and-lung number, but as a five-step oxygen cascade running from your lungs to your mitochondria, and why the bottleneck moves from your heart to your muscles as you age. You will learn the exact VO2 max floor below which everything becomes a maximal effort, the "50 at 50" target, and why women should aim for 40 to 50. Brady also lays out how the brain itself gates your fitness through myokine signaling, why the one to two hours after training may matter more than sleep for adaptation, and the truth about "non-responders" and the IGF binding protein biology behind trainability. Then the protocols: why the Norwegian 4x4 beats Tabata for VO2 max, how sauna and post-exercise ketones amplify the same session, why sleep consistency beats sleep duration, and the single weekly workout Brady says everyone should be doing for both VO2 max and brain health over the next decade. Reduce your risk of Alzheimer's with my science-backed protocol for women 30+: https://go.neuroathletics.com.au/youtube-sales-page Subscribe to The Neuro Experience for evidence-based conversations at the intersection of brain science, longevity, and performance. TOPICS DISCUSSED 00:00 Intro: Marathon Brain and the Number That Predicts How Long You Live 00:40 Does Running a Marathon Really Damage Your Brain? 01:04 The Study: 20% Myelin Loss on MRI After a Marathon 02:16 Impaired Cognition for a Month, Then Full Recovery 03:28 Why It Happens: The Brain Burns Its Own Myelin for Fuel 04:44 The Menopause Parallel: Brain Glucose Starvation and White Matter 05:57 Can Ketones and BHB Protect the Brain During a Marathon? 06:42 How Marathon Runners Should Fuel to Protect Cognition 08:22 VO2 Max: The Strongest Predictor of Mortality and Longevity 09:00 The Oxygen Cascade: What VO2 Max Actually Measures 11:08 Why VO2 Max Matters More As You Age 12:10 The VO2 Max Floor for Frailty and Daily Living 13:11 VO2 Max as a Brain Metric: Averages by Age and Sex 14:20 The "50 at 50" Target and What Women Should Aim For 15:09 The Female Masters Athlete Study and the VO2 Max Bank Account 16:01 How Your Brain Knows It Is Getting Fitter: Myokines 17:41 Mouse Studies: Block the Brain Signal, Lose the Adaptation 18:37 The Post-Workout Recovery Window That Drives Adaptation 19:53 What Kind of Rest Actually Works After Training 20:50 KetoneIQ: Clean Fuel for the Brain 21:50 Qualia Magnesium: Recovery and Deep Sleep 22:45 The Mission: Why Science Is the New Breaking News 27:25 Attacking VO2 Max From a Different Angle: What Is Your Bottleneck? 28:06 Central vs Peripheral: Heart, Muscle, and Mitochondria 30:20 Spotting Mitochondrial Dysfunction With a Simple Lactate Test 33:18 Training Each Link in the Oxygen Cascade 34:41 Targeting the Lungs: Inspiratory Muscle Training 36:19 Iron, Hemoglobin, and Heat as an Altitude Mimic 38:56 Exercise Hemolysis: Why Runners Break Down Red Blood Cells 39:59 Why Investors and CEOs Are Chasing VO2 Max 40:42 What Is Good for the Heart Is Good for the Brain 42:02 Exercise Snacks vs Deliberate Training as You Age 44:41 HIIT for Stroke Volume: Why the Norwegian 4x4 Works 45:43 4x4 vs Tabata and the 2 to 8 Minute Interval Sweet Spot 46:57 Using Heart Rate and Exertion to Train VO2 Max 48:02 Where AI Is Entering Endurance Coaching 49:14 Timeline Mitopure: Powering Your Mitochondria 50:16 Cozy Earth: Better Bedding, Better Sleep 51:04 Responders vs Non-Responders and the IGFBP Biology 55:35 How to Amplify Adaptation From the Same Training Load 56:39 Heat, Post-Exercise Ketones, and Getting the Basics Right 58:14 Sleep Consistency Beats Sleep Duration 01:00:24 The One Weekly Workout for VO2 Max and Brain Health Thank you to our sponsors KetoneIQ: https://ketone.com/NEURO for 30% OFF Qualia: https://qualialife.com/NEURO for 50% off Timeline: https://timeline.com/NEURO for Mitopure Cozy Earth: https://cozyearth.com use code NEURO for 20% off I’m Louisa Nicola - clinical neurophysiologist - Alzheimer’s prevention specialist - founder of Neuro Athletics. 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