The latest smartwatches move from tracking health to monitoring

 Over the past six months, the pandemic has probably kept you quieter than you'd like. But because COVID-19 and this year's flu virus are circulating right now, you may be more eager than ever to track your fitness activities and better understand what's happening inside your body.

Insights into your health may come directly from your wrist. Apple's latest Series 6 smartwatch, starting at $399, plus some watchOS 7 software updates available on older models, can help you measure your heart and lung health and blood oxygen consumption, as well as detect irregular heartbeats, overexposure to loud noises and how much sleep you're getting.

The smartwatch shares data with a companion health app on an iPhone or Android device. Notably for those enrolled in Medicare, certain smartwatches can be purchased at a discount as a membership benefit for certain Medicare Advantage plan participants.

4 features of some smartwatches

1. Ecg. Apple took a major step in consumer hands in 2018 by adding an ECG app to its Series 4 Apple Watch models, which has been extended to Series 5 and Series 6. The app is called ECG, rather than the better known acronym electrocardiogram, and it detects atrial fibrillation, an irregular heartbeat that is a major risk factor for stroke.

2. Measure skin. Fitbit has added an electrodermal (EDA) sensor to its Fitbit Sense Watch ($330). When you place your palm on the surface of the device, the sensor can detect subtle electrical changes in the amount of skin sweat. Taking into account your heart rate, sleep and activity data, Fitbit calculates a stress management score between 1 and 100, with higher numbers indicating fewer physical signs of stress and lower numbers indicating more signs.

3. Sleep tracking. Certain devices, including high-end Fitbits and Galaxy smartwatches, track the quality of your sleep down to each sleep stage and how many times you wake up in the middle of the night. Apple's watch is more about setting the conditions for a good night's sleep, starting with the bedtime relaxation program.

4. Blood oxygen. Fitbit, Garmin, Mobvoi, Samsung, and now the Apple 6 series all measure blood oxygen levels. Series 6 takes measurements from a set of four green, red and infrared leds on its back and four photodiodes spaced and isolated between them to determine the color of your blood.

Measurements are collected automatically throughout the day or while you sleep. You can also launch the app to take a manual reading by stabilizing your wrist on the table with the watch display facing up, clicking "Start," and then patiently waiting for the timer to count down to 15 seconds.

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