Heart Rate Variability: A Window into Health and Aging

In this episode, Dr. Matt Kaeberlein sits down with Joel Jamieson to explore the science of heart rate variability and how it connects to longevity, recovery, and performance. 

Joel shares his journey from training elite fighters to becoming a global authority on HRV training, emphasizing that healthspan is built on consistency, balance, and resilience rather than endless high-intensity workouts. 

The discussion dives into why VO2 max is one of the strongest predictors of longevity, how the parasympathetic nervous system and vagus nerve health regulate stress and recovery, and why zone 2 cardio, metabolic flexibility, and steady improvements in cardiovascular health matter more than chasing short-term results. 

This conversation reframes strength vs endurance, highlights key anti-aging biomarkers, and shows how recovery science can transform both athletes and everyday people seeking lasting health.