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[19]. The whole system (insole and optical fiber sensors) has a
total weight of only 150 g, which does not influence the natural
pattern of the gait [19]. Moreover, the sensor data are sent
to a host computer via Bluetooth, which enables high portability
of the system along with high autonomy since the average
power consumption is about 150 mA, indicating the possibility
of using commercially available power banks for operation
over about 10 hours.
In order to verify the capabilities of the 3D-printed multiplexed
insole, three analyses were performed, including
plantar pressure mapping with the user standing on the insole,
and the center of pressure (CoP) and ground reaction
force (GRF) assessment during gait. The results are summarized
in Fig. 4 and can be further verified in [17]. The plantar
pressure mapping shows the possibility of estimating regions
of abnormal pressure concentration as well as other abnormalities
such as pronated and supinated feet. It is also worth
noting that the integration of all 15 pressure measurement
points resulted in the estimation of the users' body mass with
errors lower than 3.4%. For the CoP assessment compared

Instrumentation & Measurement Magazine 24-5

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