*3.1. Participants*

Foot–floor-contact, knee-angle, and surface EMG signals were recorded from 23 healthy adults (11 males and 12 females). Average volunteer characteristics (±SD) were: height = 173 (±10) cm; mass = 63.3 (±12.4) kg; and age = 23.8 (±1.9) years. Subjects have never presented pathological condition or undergone orthopedic surgery that might have a ffected leg mechanics. Moreover, volunteers with joint pain, neurological pathologies, and abnormal gait were not recruited. Overweight and obese subjects (body mass index ≥ 25) were excluded from the study. The present research was undertaken following the ethical principles of the Helsinki Declaration and was approved by local ethical committee.
