Primary outcome
The primary outcome was self-selected gait speed under SDT (Two inertial sensors (PhysilogThe sequence of walking conditions was randomly defined before starting the gait acquisition, being (1) conventional walking without cognitive demand, named single task (ST); (2) walking interspersing ST and simultaneous dual tasks (SDT), named alternating task (AT); and (3) walking under SDT. For gait as an ST, the participant was asked to walk a linear distance of 60 m (round trip) at a self-selected walking speed in a straight and flat corridor without performing any cognitive task. For walking under AT, the participant was asked to walk the 60-m course, however, interspersing the ST and SDT (walking and counting back by 3 from the number 100), every 5 m. Participants were asked to continue walking at the same walking speed until the final distance. The command to start and finish the dual task every 5 m was given by the evaluator, according to the traffic cones on the floor placed every 5 m on the floor of the corridor. For walking under SDT, the participant was asked to walk uninterruptedly and count back by 3 s from the number 100 until the 60-m course was completed.