Welcome to my podcast. I am Doctor Warrick Bishop, and I want to help you to live as well as possible for as long as possible. I’m a practising cardiologist, best-selling author, keynote speaker, and the creator of The Healthy Heart Network. I have over 20 years as a specialist cardiologist and a private practice of over 10,000 patients.

Episode Summary

Dr. Warrick Bishop, a cardiologist, author, and CEO of the Healthy Heart Network, hosts this solo episode focused on fitness and longevity. He explores the differences between two key performance and health metrics — VO2max and lactate threshold — and explains why both matter for long-term health and aging.

Key Takeaways:

• VO2max measures the maximum amount of oxygen your body can use during intense exercise, essentially reflecting the strength and efficiency of your cardiovascular delivery system.
• A useful analogy is comparing VO2max to engine size — a high VO2max is like having a V8 engine that delivers plenty of fuel to the muscles.
• Two athletes can have identical VO2max scores yet perform very differently, which is what led elite coaches to investigate lactate as an additional metric decades ago.
• Lactate threshold reflects mitochondrial efficiency — how well the body's cells actually use the oxygen delivered to them, not just how much oxygen arrives.
• When lactate levels begin to rise during exercise, it signals that the mitochondria are being overwhelmed and the body is switching to a less efficient energy pathway.
• Lactate threshold is considered the most powerful predictor of endurance performance and long-term metabolic health.
• VO2max and lactate threshold measure different things: cardiovascular fitness versus cellular and mitochondrial fitness, respectively.
• Elite athletes and their coaches have long used both metrics together to design more targeted and effective training protocols.
• Knowing your lactate threshold allows you to tailor training to raise that threshold, improving cellular efficiency at higher exercise intensities.
• Lactate testing is beginning to enter the longevity science space, complementing the already well-established use of VO2max as a marker for healthy aging.