Metabolic Mastery, brought to you by KORR Medical Technologies, is the podcast about everything VO2 Max and beyond. Tips on testing, new research, and much more. Hosted by Dr. Marc Humbert and Dr. Cameron Garber Doctors of Physical Therapy (DPT)
Ep. 75 - Dr. Craig Broeder: The Metabolic Cart Secrets: Why Most Devices Get It Wrong
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Dr. Craig Broeder has spent 45 years at the top of exercise physiology and metabolic testing, training under legends like Jack Wilmore, David Costill, and George Brooks, running biopsy-heavy research trials, and leading elite performance projects for Red Bull's world-class athletes.
In this episode of Metabolic Mastery, hosts Dr. Marc Humbert and Dr. Cameron Garber sit down with Dr. Broeder to unpack decades of hard-won lessons on what separates accurate metabolic testing from guesswork, from calibration pitfalls to genetic limits on VO2 max, and why so many popular fitness devices get it dangerously wrong.
You Will Learn:
How Dr. Broeder's path from professional musician to exercise physiologist began, and the mentors (Wilmore, Costill, Ivy, Coyle) who shaped his career
Why mixing chamber, breath-by-breath, and mini mixing chamber metabolic systems each have unique strengths and blind spots
The real-world calibration mistakes (temperature, humidity, drying lines) that silently corrupt test data
Shocking accuracy findings from a published Cardio Coach validation study — including one popular consumer system with error rates up to 16.9%
Inside the Heritage Project: what large-scale genetic research reveals about how much of your VO2 max improvement is really genetics vs. training
Behind-the-scenes stories from Red Bull's altitude performance research with elite cyclists and runners
Why knowing a client's history, goals, and psychological comfort with testing is just as important as the protocol itself
How Dr. Broeder used metabolic testing to help a client recover from a severely underfed metabolism (800 to 1,290 calories) without weight-loss drugs
6 Oct 2026
Ep. 74 - Daniel Krumbach: The Zoning Mistake: Why Your Heart Rate Zones May Be Wrong
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Most people buying a metabolic analyzer have no idea how much data they're leaving on the table. In this episode of Metabolic Mastery, hosts Dr. Marc Humbert and Dr. Cameron Garber sit down with Daniel Krumbach, CORE's Director of International Sales and a certified exercise physiologist, chartered physiotherapist, and strength and conditioning specialist with 30 years of testing experience, to break down how to get the absolute most out of your cardio coach.
They cover why VO2 max alone only tells half the story, the hidden difference between metabolic and ventilatory zoning methods, the testing mistakes that quietly wreck your data, and why retesting (not just testing) is where the real transformation happens.
You Will Learn:
Why VO2 max is just "the sexy thing to sell", and what data actually drives real programming decisions
The critical difference between metabolic (RER-based) and ventilatory (VE/VO2, VE/VCO2) zoning methods, and why they can produce zones 20-30 beats apart
How to identify a client's true physiological limiter (cardiovascular, respiratory, or metabolic) and zone accordingly
Why "peak" and "max" aren't the same thing, and how missing a true max (RER of 1.15+) leaves critical zone-five data off the table
The proper testing protocol: a 5-minute low-intensity warm-up, correctly sized increments, and tests lasting 9-12 minutes
Why RMR and VO2 max testing should never be done in isolation from each other
How VO2 pulse and peak VO2/breathing frequency can reveal undiagnosed cardiac and respiratory issues
Why retesting, not a one-and-done test, is what truly drives client retention and long-term results
How mismatched fat/carb utilization at rest vs. during exercise points directly to nutrition issues
29 Sept 2026
Ep. 73-Dr.Thomas George: The Doctor Who Lost 120 Pounds:Inside the Science of Adaptive Thermogenesis
Get A Demo: https://korr.com/contact/video-demo/ (https://korr.com/contact/video-demo/)
Dr. Thomas George didn't set out to become an obesity medicine specialist — a traumatic brain injury and a 120-pound weight gain got him there. In this episode of Metabolic Mastery, Dr. Mark Humbert and Dr. Cameron Garber sit down with Dr. George, founder of Wellspring Weight and Wellness, to unpack the science and story behind sustainable weight management.
Dr. George shares his own journey from competitive martial artist to 330 pounds and back, and how a neuroendocrinologist's diagnosis changed the way he sees — and treats — obesity. The conversation dives deep into adipocyte biology, why "it's not about the weight," the real data behind adaptive thermogenesis, and why so many patients on GLP-1 medications still hit frustrating plateaus.
You Will Learn:
Why obesity is best understood as a "disease of diseases" and what that means for treatment
How the personal fat threshold and adipocyte hypertrophy drive metabolic dysfunction
What resting energy expenditure testing reveals about adaptive thermogenesis — and why its effects can persist up to six years
Why GLP-1/GIP medications don't fix metabolism on their own, and what's missing from many prescribing plans
How building metabolically healthy muscle protects against weight regain and sarcopenia
Why exercise matters more for maintenance than for initial weight loss
How cultural food patterns (Mediterranean, Inuit, Hispanic heritage diets) inform sustainable eating
Why calorie quality, density, and dosage matter more than any single "diet"
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Who has been a guest on Metabolic Mastery
Names identified in recent episode analyses. Showing up to five guests.
Marc Humbert
Cameron Garber
Daniel Crumback
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Apple Podcasts (US)
4.3 / 5
9 ratings
Spotify
5.0 / 5
3 ratings
Podcast Authority Score: 43 / 100
A composite of feed quality, social presence, YouTube performance and engagement. Read the methodology.
Quality
73
Social presence
0
YouTube
0
Engagement
31
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