A few years ago, an ECG (electrocardiogram) meant a visit to the doctor and a set of sticky electrodes. Today, an ECG watch lets you take a quick heart rhythm reading from your wrist, at home or on the go. But what can an ECG smartwatch really tell you, and where are its limits? This guide explains it in plain language.
What is an ECG?
An ECG records the electrical signals that make your heart beat. The pattern of those signals shows your heart rhythm: whether your heart beats regularly or irregularly. A hospital ECG uses 12 leads (electrode positions) to look at the heart from many angles. A smartwatch takes a simpler, single-lead recording between your wrist and your finger.
How does an ECG watch work?
An ECG watch has an electrode on the back that touches your wrist, and another on the case or button that you touch with a finger of your other hand. This closes a small circuit across your chest, so the watch can record your heart's electrical activity for a short time, usually around 30 seconds.
What an ECG watch can do
- Check your heart rhythm for atrial fibrillation (AFib), an irregular heart rhythm that can lead to stroke or heart failure if it goes unnoticed. AFib can come and go, so being able to check when you feel something unusual is valuable.
- Record readings you can share with your doctor, so they see what your rhythm looked like at the moment you had symptoms.
- Track your heart around the clock: most ECG watches also measure your heart rate continuously, day and night.
What an ECG watch can't do
- It can't detect a heart attack. A single-lead ECG doesn't show the information doctors need for that. If you have chest pain, call emergency services.
- It doesn't replace a 12-lead ECG or a diagnosis from your doctor.
- It only records while you take a reading. Continuous heart rate tracking is not the same as a continuous ECG.
How to take an accurate ECG reading
- Wear the watch snugly on your wrist, with the sensor touching your skin.
- Sit down and rest your arms on a table. Movement can disturb the reading.
- Start the ECG on the watch and touch the electrode with a finger of your other hand.
- Stay still and relaxed until the reading is finished.
- Save or share the result in the app, especially if you had symptoms.
What to look for when buying an ECG watch
- ECG with AFib check as the core feature.
- 24/7 heart rate monitoring for the bigger picture.
- Extra health tracking such as respiration rate, body temperature, steps and calories.
- Battery life: a watch you have to charge every night is easy to forget. Several days is better.
- Phone compatibility: make sure it works with your iPhone or Android phone.
- Medical clearance: some ECG features from major brands carry regulatory clearance (such as FDA clearance in the US). If that matters to you, check the specific product's documentation.
The VitalityWatch ECG Watch Pro
Our ECG Watch Pro with AFib detection combines an ECG check with everyday health tracking:
- ECG reading to check your heart rhythm for AFib.
- 24/7 heart rate monitoring, day and night.
- Respiration rate and body temperature monitoring.
- Steps and calories for your fitness goals.
- Up to 7 days of battery with daily use, 20 days on standby.
- Works with iPhone and Android through the DeepFit app, and is easy to set up.
Want to compare it with other VitalityWatch devices? Read AI Health Watch explained or see all health devices.
Frequently asked questions
Is an ECG watch accurate?
For checking heart rhythm, a single-lead ECG watch can give useful readings when you sit still and wear it correctly. It is not a replacement for a medical ECG or a diagnosis. Share any concerning reading with your doctor.
Can an ECG watch detect AFib?
Yes. Checking for atrial fibrillation is the main purpose of the ECG function on watches like the ECG Watch Pro.
Should I wear an ECG watch at night?
Yes, if you want continuous heart rate tracking while you sleep. The ECG reading itself is something you take on demand.
Do ECG watches work for men and women?
Yes. ECG works the same way for everyone; just make sure the strap fits your wrist comfortably.
See today's price and details on the ECG Watch Pro.
Disclaimer: This article is for general information only and is not medical advice. VitalityWatch devices are not intended to diagnose, treat, cure or prevent any disease. If you have chest pain or think you may be having a heart problem, call your local emergency number.