Inertial measures of motion for clinical biomechanics: comparative assessment of accuracy under controlled conditions - changes in accuracy over time.

However, a closer look at the changes in the accuracy during that 60s period revealed a time effect more or less significant depending on the system and the direction of motion, with a worst-case drop in accuracy for all systems revealed for 3-axes sustained rotations (mean increase in difference of 2.0° for Xsens MTx, 5.2° for APDM Opal, 1.1° for Inertial Labs OSv3).

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