Heart Rate Variability: Why Your Body Knows Before You Do
You wake up. Your alarm went off at 6am. You have a hard interval session scheduled. Your legs feel okay-ish. You’re not sure if you’re ready for it. Heart rate variability — HRV — is the metric that answers that question more reliably than anything else currently accessible to consumer athletes. Here’s why. What HRV Actually Measures Your heart doesn’t beat with perfect mechanical regularity like a metronome. Even at rest, there’s slight variation in the time between beats. That variation — measured in milliseconds — is HRV. ...