* history of cardiovascular/pulmonary disease prior to infection * covid-related myocardial injury such as evidence of myocarditis * deep vein thrombosis/pulmonary embolism following covid-19 infection * exercise intolerance resulting from conditions that are not related to cardiorespiratory or autonomic factors (e.g. osteoarthritis or other musculoskeletal diseases); * dependency of supplemental oxygen following covid infection due to cardiovascular and/or pulmonary complications following acute covid infection * body mass index \> 35kg/m2 * age of greater than 65 years.

* history of cardiovascular/pulmonary disease prior to infection * covid-related myocardial injury such as evidence of myocarditis * deep vein thrombosis/pulmonary embolism following covid-19 infection * exercise intolerance resulting from conditions that are not related to cardiorespiratory or autonomic factors (e.g. osteoarthritis or other musculoskeletal diseases); * dependency of supplemental oxygen following covid infection due to cardiovascular and/or pulmonary complications following acute covid infection * body mass index \> 35kg/m2 * age of greater than 65 years.

history of cardiovascular/pulmonary disease prior to infection covid-related myocardial injury such as evidence of myocarditis deep vein thrombosis/pulmonary embolism following covid-19 infection exercise intolerance resulting from conditions that are not related to cardiorespiratory or autonomic factors (e.g. osteoarthritis or other musculoskeletal diseases); dependency of supplemental oxygen following covid infection due to cardiovascular and/or pulmonary complications following acute covid infection body mass index > 35kg/m2 age of greater than 65 years.

history of cardiovascular/pulmonary disease prior to infection covid-related myocardial injury such as evidence of myocarditis deep vein thrombosis/pulmonary embolism following covid-19 infection exercise intolerance resulting from conditions that are not related to cardiorespiratory or autonomic factors (e.g. osteoarthritis or other musculoskeletal diseases); dependency of supplemental oxygen following covid infection due to cardiovascular and/or pulmonary complications following acute covid infection body mass index > 35kg/m2 age of greater than 65 years.