Efficacy of Non-invasive Neuromodulation Treatments for COVID-19 Sequelae

The goal of this clinical trial is to demonstrate the effectiveness of non-invasive Neuromodulation as a therapy in neurological, respiratory and musculoskeletal pathologies derived from the consequences of Covid-19. It will also estimate the impact of non-invasive neuromodulation treatment on the functionality and quality of life of patients with COVID-19 sequelae.The main question it aim to answer is: \- Is non-invasive neuromodulation effective as a therapy in neurological, respiratory and musculoskeletal pathologies derived from the consequences of Covid-19. Researchers will compare non-invasive neuromodulation to a placebo (treatment with the machine turned off). Participants will: * Be evaluated before starting treatment. * Be evaluated 3 weeks after. * Be evaluated at 5 weeks, or 15 sessions or completion of treatment. * Be evaluated 6 weeks after finishing the treatment or 11 weeks after starting treatment.

The waves of Sars-Cov-2 disease continue to be continuous and we are increasingly aware of the consequences it causes both in the respiratory system, musculoskeletal system and in the central and peripheral nervous system. Likewise, non-invasive neuromodulation acts with a pump of ions, generating endogenous stimuli that modulate the central nervous system. The aim of this clinical trial is to demonstrate the effectiveness of non-invasive Neuromodulation as a therapy in neurological, respiratory and musculoskeletal pathologies derived from the consequences of Covid-19. To carry out this study, pain was measured with the visual analogue scale. It was also measured the joint amplitude, a muscle assessment with the help of a strength dynamometer, the patient's independence with the Katz index and the functionality of the lower or upper limbs, depending on the affected joint.