Inclusion Criteria:  Post-COVID-19 patients who required hospitalization due to COVID-19 severe infection. Post-COVID-19 patients who required hospitalization and present neuromuscular sequelae due to COVID-19 severe infection.  Exclusion Criteria:  Patient has a demand-type cardiac pacemaker, implanted defibrillator or other implanted electronic device. Active wound infection. Below the knee amputations. Based on the clinicians decision whether the patient is eligible for the study.