“…One paper, due to its age, used strips of inked moleskin on a paper walkway [25] to determine spatio-temporal parameters. Two studies used tri-axial accelerometers (SMI, MP6000, InvenSense), either placed on the lower back at level L4 [26] or on the trunk and foot [30], another study used different accelerometers (Locomotion Evaluation and Gait System, LEGSys™, BioSensics, Cambridge, MA) placed on the lower limbs [22], whole inertial sensors (OPAL IMUs, APDM, Portland, USA), fixed with a belt or elastic straps at the lower back (L4–5) and frontal to the left and right ankle joints [6] or inertial sensors placed on the rollator used [17]. In one study, the rollator was instrumented with four single axis load cells (Futek LCM300, FUTEK Advanced Sensor Technology Inc., Irvine, California) and corresponding transmitters (Mantracourt T24-ACMi, Mantracourt Electronics Ltd., Exeter, UK).…”