This study is a prospective, multi-center, and non-invasive cohort study. All participants are diagnosed with Asthma, COPD and ILD. We use SARC-Calf questionnaire, Frailty questionnaire and Grip strength as a tool for prescreen. According to the 2019 Asian Sarcopenia Consensus, participants are examined by SARC-Calf questionnaire, grip strength test and a physical performance test, including sit-stand test, short physical performance battery (SPPB), gait speed test and six-minute walk test. Bioelectrical impedance analysis (BIA) and Dual-energy X-ray absorptiometry (DXA) are applied to all participants by to analyze body composition. Participants are further classified into no Sarcopenia group, Sarcopenia group, and severe Sarcopenia group to derive the prevalence.
