Many people use smartwatches to check their daily steps, sleep, and heart rate. However, a new study shows that many health numbers on these devices are actually computer estimates. They are not always exact measurements of your body.
Sensors in smartwatches use light and motion to collect information. Simple measurements, like step counts and resting heart rate, are usually quite accurate. In contrast, complex numbers like burned calories, sleep stages, and recovery are often less reliable.
Things like sweat, movement, skin tone, and watch fit can also affect the results. Experts say you should look at your personal trends over time instead of trusting one single number.
Difficult words
- estimate — a guess or calculation of a number or valueestimates
- measurement — the exact size, amount, or degree of somethingmeasurements
- accurate — correct and true without any mistakes
- reliable — able to be trusted or believed
- affect — to change or make a difference to something
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- Do you use a smartwatch or another device to track your health? Why or why not?
- Why do you think smartwatch numbers are not always exact?
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