Fig 1.
Examples of raw data acquired from smartphone sensors (black line), force platform (green line) and inertial measurement unit (blue line). Variables extracted for each analysis are indicated in the plots. Light grey rectangles indicate time windows used for analyses. The smartphone vertical acceleration shown in the plot is that used to extract concentric force and landing impact; for the calculation of time of flight, please refer to the text. Note that early and late dynamic balance were calculated on the resultant acceleration. IMU: Inertial measurement unit.
Table 1.
Validity of smartphone sensors compared to force platform and inertial measurement units.
Fig 2.
Bland-Altman plots between acceleration estimates from smartphone and force platform (time of flight, concentric force, landing impact, early and late dynamic balance), and between orientation estimates from smartphone and inertial measurement unit (sagittal and frontal trunk orientation).