A robust machine learning enabled decomposition of shear ground reaction forces during the double contact phase of walking.

Background: Dynamic analyses of walking rely on the 3D ground reaction forces (GRF) under each foot, while only the resultant force of both limbs may be recorded on a single-belt instrumented treadmill or when both feet touch the same force platform.

Research Question: This study aims to develop a robust decomposition of the shear GRF to complete the most accurate decomposition of the vertical GRF [8].

Methods: A retrospective study of 374 healthy adults records (age: 22.

Does an instrumented treadmill correctly measure the ground reaction forces?

Since the 1990s, treadmills have been equipped with multi-axis force transducers to measure the three components of the ground reaction forces during walking and running. These measurements are correctly performed if the whole treadmill (including the motor) is mounted on the transducers. In this case, the acceleration of the treadmill centre of mass relative to the reference frame of the laboratory is nil.

Biomechanical analysis of running in weightlessness on a treadmill equipped with a subject loading system.

One countermeasure used during long-duration spaceflight to maintain bone and muscle mass is a treadmill equipped with a subject loading system (SLS) that simulates gravity. To date, little is known about the biomechanics of running in weightlessness on such a treadmill-SLS system. We have designed an instrumented treadmill/force plate to compare the biomechanics of running in weightlessness to running on Earth.