What HRV measures
Heart rate variability reflects variation between heartbeats and is often used as a proxy for autonomic nervous system balance. Research suggests trends may be useful, but readings are sensitive to context.
How to use HRV carefully
HRV should be interpreted alongside sleep, soreness, mood, training load, and illness signals. It should not be treated as a medical diagnosis.
Studies Reviewed
Heart rate variability and training readiness
moderate evidenceExercise physiology researchers · Sports physiology literature · 2024
HRV-guided training may help some users adjust load, but measurement consistency and context are critical.