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.
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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
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I’m Louisa Nicola - clinical neurophysiologist - Alzheimer’s prevention specialist - founder of Neuro Athletics.
My mission is to translate cutting-edge neuroscience into actionable strategies for cognitive longevity, peak performance, and brain disease prevention. If you're committed to optimizing your brain- reducing Alzheimer’s risk - and staying mentally sharp for life, you’re in the right place.
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