Apple Watch Series 7: Buyer's Guide, Should You Buy?

Apple Watch

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Apple Watch Series 7: Buyer's Guide, Should You Buy?

The Apple Watch Series 7 offers the same health monitoring features available with the Series 6. A second-generation optical heart rate sensor calculates metrics like calorie burn, resting heart rate, and a heart rate that's too high, and the electrical heart rate sensor can be used for taking electrocardiograms, while LEDs and infrared light enable blood oxygen monitoring. A built-in accelerometer and gyroscope enable other important health-related features such as fall detection.

The Apple Watch can detect a low heart rate, a high heart rate, and an abnormal heart rate, monitoring for health problems like atrial fibrillation and sending notifications when anomalies are detected.

Blood Oxygen Monitoring

The sensors on the back of the Apple Watch enable the blood oxygen monitoring feature available in the Apple Watch Series 7. Blood oxygen saturation in a healthy individual is around 95 to 100 percent, and when the percentage of oxygen in the blood drops below that, it can be indicative of a serious health issue that needs immediate attention.

Green, red, and infrared LEDs shine light onto the blood vessels in the wrist, with photodiodes measuring the amount of light reflected back. Apple's algorithms then calculate the color of the blood, which is an indication of how much oxygen is present.

Bright red blood is well oxygenated, while darker blood has less oxygen, and that is how the Apple Watch makes its determination about blood oxygen level. Like the Series 6, the Series 7 can measure blood oxygen between 70 and 100 percent.

Blood oxygen measurements can be taken on-demand using the Blood Oxygen app installed on the Apple Watch. To take a measurement, make sure the Apple Watch is snug on the wrist, open the app, stay still, and keep the wrist flat. Tap the Start button and then hold your arm steady for 15 seconds.At the end of the elapsed time, the Apple Watch provides a reading of your blood oxygen level, with the data stored in the Health app on the iPhone.

The Apple Watch Series 7 also takes some blood oxygen measurements in the background and this is set up when the Apple Watch is set up. These settings are available in the Health app on the iPhone. Tap Browse > Respiratory > Blood Oxygen > Set Up Blood Oxygen.

Blood oxygen measurements happen when there is no movement, and based on your daily activity, the number of readings per day and the time between readings varies. Blood oxygen measurements result in a bright light on the wrist that can be distracting in dark rooms, so background measurements can be turned off for Sleep Mode and Theater Mode if desired through the Apple Watch's Settings app.

During sleep, blood oxygen measurements are only taken if the Track Sleep with Apple Watch option is enabled and the watch is being used for Sleep Tracking purposes.

Keeping still is essential for accurate measurements, and the watch must be able to make good contact with the top of the wrist through a snug wristband. Apple says that tattoos can impact performance, as can skin perfusion or the amount of blood flowing through the skin. In cold weather, for example, readings can be affected.

Postures like having the arm hanging at your side or fingers in a fist position can result in unsuccessful measurements, as can motion, and if the resting heart rate is above 150 beats per minute, the Apple Watch won't be able to provide a successful blood oxygen reading.

According to Apple, blood oxygen measurements taken with the Apple Watch Series 7 are not meant for medical use and are designed for "general fitness and wellness purposes." Because blood oxygen monitoring does not require the same regulatory approval as ECG readings, it is available in more than 100 countries, with a list that can be found on Apple's website.

ECGs

Electrodes in the back of the Apple Watch and the Digital Crown work together to allow users to take single-lead electrocardiograms, just like in the Apple Watch Series 4. An ECG measures the electrical activity of the heart and can be used to diagnose health conditions by a doctor.

ECGs are captured by holding a finger on the Digital Crown of the Apple Watch and can detect a sinus rhythm (normal), an abnormal result, or, sometimes, an inconclusive result that should be shared with a doctor. The ECG is able to detect atrial fibrillation at heart rates above 100 beats per minute.

A single-lead ECG like the Apple Watch means there are two points of contact measuring the electrical sensations of your heart. Clinical electrocardiograms done by your doctor can have six to 12 leads for greater accuracy, but the Apple Watch offers the convenience of being able to take an ECG anytime anywhere in approximately 30 seconds.

Because regulatory clearance is required for the ECG feature, it is limited to Apple Watch users in select countries, with a list available on Apple's Feature Availability website. Apple is continually bringing ECG functionality to new countries.

Sleep Tracking

The Apple Watch Series 7 can be worn at night to monitor your sleep, with Apple providing data on how long you sleep each night. The feature also offers up useful tools for getting a better night's sleep, with details available in our Sleep Tracking guide.

Sleep tracking is available on older Apple Watch models as well, as it is enabled through software rather than hardware, but newer models have battery efficiency and faster charging so you can charge your Apple Watch quicker in the morning after a night's sleep.