Steady
What is HRV?
Heart-rate variability (HRV) is the tiny change in time between heartbeats. Higher variation often tracks with a calmer, more recovered state — lower variation can show up when you are strained, sick or short on sleep.
Not the same as heart rate
Heart rate counts beats per minute. HRV looks at the spacing between those beats. Two people can share a similar resting heart rate and still show very different HRV patterns.
Wearables estimate HRV from optical sensors or from Apple Watch platforms that surface values into Apple Health. Numbers can bounce day to day, so trends matter more than a single reading.
Why people pay attention
- Recovery context — after hard training, travel or a rough night, HRV often dips.
- Everyday strain — work pressure, illness and poor sleep can pull the same signal.
- Breathing and calm — slow breathing practices sometimes raise short-term HRV.
In Steady: HRV helps shape the stress picture on your phone and Watch — calm, elevated or stressed — using readings already in Apple Health, kept on your device.
How to read it without overthinking
Compare today to your own recent baseline, not to a stranger on the internet. Age, fitness, medications and measurement timing all change absolute values. Morning readings in similar conditions are easier to compare than mixed evening samples.
If a number looks odd once, wait for the next few days. Persistent change alongside sleep loss, illness or big life stress is usually more informative than a single spike.
Where Steady fits
Steady is built to show HRV beside sleep, fasting and the rest of your day — so the signal has context. It is a wellness view, not a diagnosis.
Steady is a wellness companion, not a medical device. This guide is for everyday understanding only and is not clinical advice.