Cardiovascular Physiology
Zone 2 Aerobic Base: Cellular Mechanisms of Mitochondrial Biogenesis
Zone 2 training (60-70% max heart rate) represents the intensity where blood lactate clearance equals lactate production. This metabolic state stimulates PGC-1α expression, driving new mitochondrial synthesis and optimizing long-chain fatty acid oxidation.
• 3 to 4 sessions per week (45-60 min each).
• Maintain nasal breathing or conversational pace.
• Blood lactate benchmark: 1.5 - 2.0 mmol/L.