Modelling / Simulation
This study investigated how accurately ground reaction forces (GRFs) can be estimated from body centre of mass (BCOM) motion derived using markerless motion capture. Fifteen participants performed a countermovement jump (CMJ) on, and a running trial across, force plates. Kinematics captured using markerless and marker-based systems were used to drive IK-constrained OpenSim models. The resulting BCOM displacements were double differentiated to inversely estimate GRFs and compared to force plate data. Markerless-derived estimates were similar to measured GRFs (RMSD = ~70-150 N) and vertical peak force, impulse and rate of force development were also accurately estimated (effect sizes < 0.2), similarly to marker-based outputs. Our markerless workflow shows promise for the estimation of vertical GRF parameters out in the field, without markers or force plates.
Colyer, Steffi; Needham, Laurie; Evans, Murray; Wade, Logan; Cosker, Darren; Cazzola, Dario; McGuigan, Polly; and Bilzon, James
"ESTIMATION OF GROUND REACTION FORCES FROM MARKERLESS KINEMATICS AND COMPARISON AGAINST MEASURED FORCE PLATE DATA,"
ISBS Proceedings Archive: Vol. 41:
1, Article 23.
Available at: https://commons.nmu.edu/isbs/vol41/iss1/23