* a history of chronic obstructive pulmonary disease or other respiratory diseases * a history of arrhythmia,cancer, end-stage renal disease with dialysis, being diagnosed with mental illness, recent stroke within 6 months * inability to participate because of comorbid neurological or musculoskeletal conditions that produce moderate to severe physical disability * need all day oxygen support

* a history of chronic obstructive pulmonary disease or other respiratory diseases * a history of arrhythmia,cancer, end-stage renal disease with dialysis, being diagnosed with mental illness, recent stroke within 6 months * inability to participate because of comorbid neurological or musculoskeletal conditions that produce moderate to severe physical disability * need all day oxygen support

a history of chronic obstructive pulmonary disease or other respiratory diseases a history of arrhythmia,cancer, end-stage renal disease with dialysis, being diagnosed with mental illness, recent stroke within 6 months inability to participate because of comorbid neurological or musculoskeletal conditions that produce moderate to severe physical disability need all day oxygen support

a history of chronic obstructive pulmonary disease or other respiratory diseases a history of arrhythmia,cancer, end-stage renal disease with dialysis, being diagnosed with mental illness, recent stroke within 6 months inability to participate because of comorbid neurological or musculoskeletal conditions that produce moderate to severe physical disability need all day oxygen support