The non-invasive neuromodulation experimental group, are treated 20 sessions with the NXSignal non-invasive neuromodulation device (NESA)

The non-invasive neuromodulation placebo group, are treated 20 sessions with the NXSignal non-invasive neuromodulation device (NESA)

The electrodes will be placed with the help of gloves and adapted socks for 1 hour, each session, until 13 intervention sessions are completed. In addition, depending on the session, an adhesive electrode will be placed at the level of C7. Characteristics of microcurrents: pulsed monophasic rectangular wave with a pulse of 1.3 s and pause of 300 ms, voltage 3 millivolt and intensity 0.5 μA

The instrument will be used to measure the change of pain before and after the intervention will be the Visual Analogue Scale (VAS).

Participants will be asked to mark the level of their pain on a 100 mm, no hatched VAS scale marked at one end as "no pain" and at the other as "worst pain imaginable".

The Pittsburgh Sleep Quality Index (PSQI) will be used. It consists of 19 self-administered questions and 5 questions assessed by the patient's partner or roommate (if available). Only the self-administered questions are included in the score.

The higher the total score, the worse the sleep quality. Thus, a total score less than or equal to five on the Pittsburgh scale indicates that, in general, your sleep quality is optimal, while a total score greater than five suggests that you have sleep problems, of greater or lesser severity.

The Stroke-specific quality of life scale ( ECVI-38) is a specific scale for stroke patients. This instrument includes 38 items divided into eight subgroups: physical status, communication, cognition, emotions, feelings, basic activities of daily living, common activities of daily living and socio-familial functioning.

The format presents five response possibilities: 5 represents the worst situation and 1 represents the absence of the problem.

The Barthel index for the level of independence in performing activities of daily living.

The purpose of this questionnaire is to assign a score to each patient based on his or her degree of dependence in performing a series of basic activities. The values assigned to each activity depend on the time taken to perform them and the need for aids to complete them.

activity of daily living include: eating, transferring between chair and bed, personal grooming, toileting, bathing/showering, transferring, going up/down stairs, dressing/dressing, stool control and urine control.

The activities are assessed by assigning a score between 0, 5, 10 and 15 points and the final result can vary between 0 (completely dependent) and 100 points (completely independent).