A neurostimulation system and method of blocking a neural axon. Time-varying electrical energy is conveyed to a blocking site on the neural axon for an initial phase. The conveyed electrical energy has an amplitude and frequency during the initial phase sufficient to block action potentials from propagating along the neural axon from a location proximal to the blocking site to a location distal to the blocking site. The time-varying electrical energy is conveyed to the blocking site on the neural axon for a subsequent phase contiguous with the initial phase. The conveyed electrical energy has a decreased amplitude and a frequency during the subsequent phase sufficient to maintain blocking of the action potentials along the neural axon from the location proximal to the blocking site to the location distal to the blocking site.
