HRV Health Decoder

HRV varies significantly by age, gender, and fitness. For adults aged 25–35, an RMSSD of 40–60ms is average, 60–80ms is good, and above 80ms is excellent. Athletes often exceed 100ms. The trend over time matters more than any single reading.

HRV is influenced by sleep quality, stress, alcohol, exercise intensity, hydration, and illness. A single night of poor sleep can drop HRV by 20–40%. Chronic stress suppresses HRV over weeks.

Use a chest strap (Polar H10 is gold standard) or a smartwatch with optical HRV (Polar, Fitbit, Garmin). Measure first thing in the morning while still lying in bed. Look for the RMSSD value in your device’s app.

Generally yes — higher HRV indicates better autonomic nervous system flexibility and stress resilience. However, unusually high HRV spikes can indicate overreaching or illness onset. Consistency and personal trends matter most.