Previous studies have shown that increasing afferent input by peripheral electrical stimulation (ES) at sensory threshold enhanced the plasticity of contralateral primary sensory cortex, the excitability of corticospinal tracts, and the functional performance in young adults. Combining afferent input with strength training was more effective than strength training along. ES, which is easy to quantify the dose of afferent input, is a feasible method to provide such training.