Effects of the treatment with peripheral electromagnetic stimulation in healthy male soccer players after inducing delayed onset muscle soreness (DOMS) with one hour of resistance exercises with an eccentric component: A randomized controlled trial

The players will perform a conventional warm up, similar to a normal practice, afterwards they will follow Howatson et al. protocol (1 hour duration) to induce DOMS which will consist in 10 series of 10 repetitions of jumps from a box 40 cm height. Afterwards they will perform 3 series of 10 repetitions of a Bulgarian squat, front squat and one leg squat. While the players perform the exercises the physical therapist in charge of the protocol and of the supervision of the players will be asking how they feel, to adapt the loads to achieve at least a 7 out of 10 in the modified Borg scale or the 70% of their 1RM Once they have finished the exercise protocol, the players that are in the intervention group will receive their first session of electromagnetic stimulation of a total of 3. Each session, first one after the exercise protocol and the next two will be administrated at the same hour in 3 consecutive days with the same stimulation protocol. This stimulation protocol consist in a total of 5 trains of pulses at 100hz of frequency of a duration of 5 seconds with 55 seconds rest. The intensity will be a sensitive threshold, the player should feel the current induced by the magnetic field but the physical therapist expert in electrotherapy can not see a muscle contraction The placebo group will receive the same treating protocol the same days and hours of the day with the difference that in this players the electromagnetic coil will be placed 10 cm above the stimulation point. The stimulation point will be the femoral nerve located in the proximal and medial side of the thigh, while the players lays on a supine position