Participants will receive first one session of automated mechanical peripheral stimulation (AMPS) with intensity at the pain threshold. Then, after a 2-week washout, they will receive one session of a simulated automated mechanical peripheral stimulation (SHAM) with intensity at the sensory threshold.

Participants will receive first one session of simulated automated mechanical peripheral stimulation (SHAM) with intensity at the sensory threshold. Then, after a 2-week washout, they will receive one session of automated mechanical peripheral stimulation (AMPS) with intensity at the pain threshold.

Automated mechanical pressure reaching the pain threshold in four specific points at the foots soles

Time spent for the participant to rise from a standard chair without armrests, walk 3 meters straight at their preferred speed, turn, walk back to the chair and sit down again. Participants will perform the test twice and the lowest total duration will be considered as the outcome. The outcome measure is assessed as a difference or change from baseline to immediately after the intervention (about 1 hour from baseline assessment).

Stabilometric variables of the center of pressure assessed using a 3D Force Plate (Kistler, US). Outcomes include anteroposterior and mediolateral velocity, root mean square and area) of the center of pressure. The outcome measure is assessed as a difference or change from baseline to immediately after the intervention (about 1 hour from baseline assessment).

R-R intervals (time between every electrocardiogram R waves) will be recorded using a Polar V800 (Polar Electro Oy, Finland) and its variability will be quantified using linear and nonlinear methods. The outcome measure is assessed as a difference or change from baseline to immediately after the intervention (about 1 hour from baseline assessment).

Participants will be asked to: 1) firmly sit on a chair without armrests for at least 10 s; 2) stand up freely and keep the position for at least 10 s; 3) close the eyes during orthostatic position for at least 5 s; 4) control balance keeping the eyes closed while nudged by the clinician; 5) open the eyes and maintain upright position for at least 10 s; 6) perform a 360º turn around himself/herself; 7) sit down on the chair; and 8) walk as straight as possible for at least 10 m. The Tinetti test total score ranges from 0 to 28. The lower the score on the Tinetti test, the lower the functional mobility and the higher the risk of falling. The outcome measure is assessed as a difference or change from baseline to immediately after the intervention (about 1 hour from baseline assessment).