COVID-19(7) coronavirus(5) 6‐minute walk test(4) reduced(4) SARS‐CoV‐2(4) increase in(4) Pulmonary function testing(4) syndrome(4) impairment(4) physical(4) greater(4) Tolerance(4) question(4) Cardiopulmonary(4) Evidence(4) control subject(4) SARS-CoV-2(4) control subjects(4) SARS‐CoV‐2 infection(4) 6MWT(4) heart rate recovery(4) characterized(4) physical activity(4) response(4) New(4) Volume(4) these symptoms(4) acute illness(4) decrease(4) defined(4)