Surface Electromyography (EMG) recording. EMG data were collected from the right (dominant) thigh: vastus lateralis (VL) was selected as the main knee extensor muscle.
Pre-gelled surface EMG electrodes (circular contact area of 1 cm diameter, BIOPAC Systems, Inc., Goleta, CA, USA) were placed (inter-electrode distance equal to 20 mm) at two-thirds on the line from the anterior spina iliaca superior to the lateral side of the patella [33].