
It records overall movement, much like a pedometer
It’s harmless – it runs on a battery, like your watch
There isn’t an ‘on’ and ‘off’ switch
You don’t need to be an ‘active’ person for the device to
work
There is no screen to look at
It can’t tell what type of activity you’re doing**
It can’t tell where you are, it’s not a tracking device**
I’ve worn it myself and nobody even noticed**
It is expensive for researchers, but has no street value**
**might be especially important when talking with teenagers
How the accelerometer works:
what you tell participants
Kelli L. Cain, San Diego May 2014
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