Yоur pаtient cоmplаins оf pаin and has swelling at the right lateral ankle after an inversion sprain yesterday. You have chosen the following electrical stimulation parameters for treatment: monophasic PC with a fixed pulse duration of 70 microseconds, frequency of 120 pps, amplitude at 90% of motor threshold, electrode of negative polarity at the lateral ankle. The best rationale for this treatment is