Fatigability in Long COVID-19

Inclusion Criteria: * ambulatory patients (with or without a gait aid) * 50 years of age or older * with a confirmed diagnosis of COVID-19 by polymerase chain reaction (PCR) test, antibody test or clinical diagnosis * the symptom of fatigue reported greater than 12-weeks post-infection (reporting fatigue: yes/no) * receiving care at the DC VAMC * the ability to speak and read English, and orientation to person, place, and time * the comparison group will include ambulatory patients (with or without a gait aid) * 50 years of age or older * with a confirmed diagnosis of COVID-19 by PCR test, antibody test or clinical diagnosis * without the symptom of fatigue reported greater than 12-weeks post-infection * receiving care at the DC VAMC * the ability to speak and read English, and orientation to person, place, and time Exclusion Criteria: * \<50 years of age without a confirmed diagnosis of COVID-19 by PCR test * antibody test or clinical diagnosis or with a confirmed diagnosis of COVID-19 of \<12-weeks * non-ambulatory individuals * Veterans who do not use the DC VAMC as their main site for care * body mass index 40 kg/m2 * diagnosis of psychiatric disorder(s) * any medically uncontrolled cardiovascular * musculoskeletal disease, or other conditions that, in the opinion of the principal investigator, could make participation in the study unsafe * any orthopedic or joint pain which would prevent the participant from safely engaging in the study protocol * additio…