“…It is important to note, however, that MEP amplitude reflects the excitability of the corticospinal pathway, and that changes in spinal excitability were not examined in the current study. Nonetheless, evidence demonstrates that after motor training with the upper and lower limbs spinal excitability is not altered ( Lagerquist et al, 2006 ; Mcdonnell and Ridding, 2006 ; Beck et al, 2007 ; Szecsi and Straube, 2007 ; Cirillo et al, 2010 ), suggesting that changes in MEP amplitude in the current study were driven predominately by cortical plasticity. But it remains possible that plasticity in the spinal cord in older adults may compensate for reductions in cortical plasticity.…”