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Trial registered on ANZCTR

Registration number

ACTRN12622000841774

Ethics application status

Approved

Date submitted

12/05/2022

Date registered

15/06/2022

Date last updated

15/06/2022

Date data sharing statement initially provided

15/06/2022

Type of registration

Prospectively registered

Titles & IDs

Public title

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

Scientific title

Secondary ID [1]

none

Universal Trial Number (UTN)

Trial acronym

Linked study record

Health condition

Health condition(s) or problem(s) studied:

Delayed onset muscle soreness

Condition category

Condition code

Musculoskeletal

Other muscular and skeletal disorders

Physical Medicine / Rehabilitation

Physiotherapy

Intervention/exposure

Study type

Interventional

Description of intervention(s) / exposure

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

Intervention code [1]

Rehabilitation

Intervention code [2]

Treatment: Devices

Comparator / control treatment

the control group will receive a placebo treatment Wich it will consist in the same application with the same device and the same intensity but placing the coil 10 cm higher to the stimulation point, This distance does not allowed the electromagnetic field to stimulate the nerve.

Control group

Placebo

Outcomes

Primary outcome [1]

Superficial electromyography for vastus medialis with the Mdurance device will be used to asses muscle activation.

Timepoint [1]

It will be measured pre intervention, immediately post intervention, 24, 48 and 72 hours(primary endpoint) after the intervention

Primary outcome [2]

isometric strength measured with a dynamometer for leg extension

Timepoint [2]

It will be measured pre intervention, immediately post intervention, 24, 48 and 72 hours(primary endpoint) after the intervention

Primary outcome [3]

Pain to pressure measured with an algometer in Zone 1 of the quadriceps, from 0 to 3 cm with respect to the upper pole of the patella.

Timepoint [3]

It will be measured pre intervention, immediately post intervention, 24, 48 and 72 hours(primary endpoint) after the intervention

Secondary outcome [1]

pain will be also measured with the visual analogue scale with a maximum score of 100.

Timepoint [1]