Benefits of home-based exercise training following critical SARS-CoV-2 infection: a case study
Abstract Purpose: We report for the first time the effect of exercise training in a survivor patient from critical COVID-19 illness. Methods: A 67-yr-old woman who had critical COVID-19 disease underwent a 10-wk home-based exercise training aimed at recovering her overall physical condition. Before and after the intervention, we assessed cardiopulmonary parameters, skeletal muscle strength and functionality, fatigue severity and self-reported persistent symptoms. Results: The patient was hospitalized for 71 days, being admitted in the intensive care unit (ICU) due to respiratory failure. At baseline (3 months after discharge), she presented with severe impairment in cardiorespiratory functional capacity (<50% age predicted VO2peak). After the intervention, remarkable improvements in VO2peak (∆: 45.9%), oxygen uptake efficiency slope (OUES; ∆: 30.1%), HR/VO2 slope (∆: -43.5%), the lowest VE/VCO2 ratio (∆: -7.1%), and exertional dyspnea were observed. In addition, handgrip strength (∆: 22.7%), 30-second Sit-to-Stand (30-STS; ∆:14.3%), Timed-Up-&-Go (TUG; ∆: -15%) performance and Post-COVID Functional Status (PCFS) score (4 vs. 2) were also improved from baseline to post-intervention. Self-reported persistent symptoms were also improved and Fatigue Severity Scale (FSS) score decreased (4 vs. 2.7) from baseline to post-intervention.Conclusions: This is the first evidence that a semi-supervised, home-based exercise training program may be safe and potentially effective in improving cardiorespiratory and physical functionality in COVID-19 survivors. Controlled studies are warranted to confirm these findings.