This study aims to evaluate the impact of a non-pharmacological treatment (nutritional therapy and pulmonary rehabilitation) on endothelial function, body composition, and physical functionality in recovered COVID-19 patients.
The primary research question is: What is the effect of a non-pharmacological treatment (nutritional therapy and pulmonary rehabilitation) on endothelial function, body composition, and physical capacity in recovered COVID-19 patients, compared to those receiving conventional medical management? A nutritional treatment combined with L-citrulline supplementation (intervention group) will be compared against conventional treatment alone (control group). Both groups will undergo pulmonary rehabilitation for a 3-month follow-up.
Subjects assigned to the intervention group will be required to:
* Take 4 g of L-citrulline daily for 3 months.
* Attend an interim session at 1.5 months for review of the nutritional treatment and supplementation.
* Keep a record of each supplement intake.