Introduction
Weak transcranial direct current stimulation (tDCS, 1–4 mA) alters corticospinal excitability (Nitsche and Paulus The impact of tDCS on the function and excitability of spinal cord pathways has not been well established. The Hoffmann-reflex (H-reflex), the electrical analog of the spinal stretch reflex, is a measure of spinal reflex excitability. Its amplitude reflects the excitability of its pathway, which is influenced by spinal and supraspinal input (Zehr Spinal reflexes contribute to normal and impaired sensorimotor functions in lower extremity (Zehr and Stein 