What does it mean if HRV is low?

If your heart rate variability is low, it means your heart isn’t changing its beat as much as it should, like a metronome that only ticks one way.

Imagine you're playing with your favorite toy car on the floor. When everything’s calm, the car moves smoothly and steadily, that's like having a normal heart rate variability. But if something surprising happens, like your brother jumps in front of the car, it suddenly stops or changes direction quickly. That’s like when your heart has to work harder or change faster than usual.

Now imagine the toy car only goes forward, no matter what happens around it. It never slows down, never speeds up, just keeps going at the same pace all day. That's what having low HRV feels like for your body. Your heart doesn't get to rest as much or recover as well after a busy moment.

Low HRV is like being tired all the time, even when you're not doing anything hard. It means your body might be working extra hard behind the scenes just to keep going, kind of like how you sometimes need an extra nap after a long day at the park.