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Fig. 1. Parameters monitored by wearable devices with related normal range values.
very competitive and is still expanding, with new companies
doing significant business with relatively inexpensive devices
(e.g., Xiaomi with Mi Band). Wearable devices can be classified
according to different aspects, such as application (e.g.,
sport and fitness, patient monitoring, home healthcare), type
(e.g., smartwatches, activity trackers, chest strap monitors,
smart clothing), and measured parameters (e.g., HR, sleep,
activity).
Power consumption is surely an important aspect for the
improvement of these devices, and energy harvesting techniques
can be exploited [11]. Wrist-worn devices are surely
more common than chest-strap ones, mainly thanks to the
ease of wearing them in everyday life activities (even if their
accuracy is generally lower, especially during intense activities)
and lack of stigma. Fitbit is the most applied device in the
literature, with step counting-with a mean absolute percentage
error (MAPE) equal to 6.3%, and energy expenditure with

Instrumentation & Measurement Magazine 24-6

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