Synchronously recorded gait kinematic data with Inertial Measurement Units and a photogrammetry system for a validation assessment

Description

A gait database of 32 healthy adult subjects was built , volunteers were between 20 and 63 y.o. (33.64 ± 12.44) and 71.88% were females. Every individual underwent a barefoot walking test recorded simultaneously with Inertial Measurement Units (IMUs) and the photogrammetry system Vicon. The dataset contains the kinematic gait information of the hip, knee, and ankle joints in the three planes of motion: sagittal, frontal, and transversal. 

The signals recorded by the IMUs are referred to as I(t) and were captured with a sampling frequency of 50 Hz, and those recorded by the photogrammetry system are called V(t) and were captured with a sampling frequency of 100 Hz. To perform a comparative study of both systems, the V(t) signals must be resampled to 50 Hz. Then, the delay between the two signals must be corrected to align them. Finally, gait cycles can be extracted for each pair of trials following the data information provided, obtaining a pair of waveforms for each gait cycle [I(t), V(t)]. A total of 268 synchronous gait cycles [I(t), V(t)] can be recovered and analyzed in the three planes of motion per limb.

Data information

• raw_data: folder containing the 32 subjects raw kinematic signals recorded with IMUs (sampling frequency 50 Hz) and photogrammetry system (sampling frequency 100 Hz) synchronously.
  
  • For IMUs records:
    • Z: sagittal plane.
    • X: frontal plane.
    • Y: transversal plane.
  • For photogrammetry system records:
    • X: sagittal plane.
    • Y: frontal plane.
    • Z: transversal plane.

• captures_information.xlsx: table containing the delay correction and the samples corresponding to the events of the gait cycles. The delay correction is the number of samples for which each photogrammetry signal V(t), after being resampled to 50 Hz, must be moved to be completely aligned with its synchronous IMUs signal couple I(t).
  • If the delay is positive (+) the V(t) signal must be delayed by adding zeros at the beginning.
  • If the delay is negative (-) the V(t) signal must be moved forward by removing zeros at the beginning.