The Principles of Performance Podcast 125 – Heart Rate Variability, Stress and Endurance Training with Marco Altini
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Jan 22, 2025 
Marco Altini, a scientist and developer at the crossroads of health and technology, shares his expertise on heart rate variability (HRV) and performance. He emphasizes HRV's crucial role in assessing athletes' stress responses and optimizing recovery. The conversation covers the interplay between wearables and physiological data, stressing the need for understanding individual differences. Altini also discusses the importance of zone training for endurance fitness, offering insights into training strategies that maximize performance while managing stress.
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HRV Explained
- HRV measures the variation between heartbeats, not just the rate itself.
- This variation reflects the body's stress response via the autonomic nervous system.
HRV Formulas
- Many different formulas exist for calculating HRV, creating a standardization challenge.
- However, RMSSD has become more consistently used, improving data comparison across platforms.
Accurate HRV Measurement
- Chest straps provide true HRV data (electrical heart activity), while other wearables measure pulse rate variability (PRV).
- Consider measurement timing and body position, as they influence data interpretation, morning measurements being generally preferred.
