Keywords patient outcome assessment, exercise tests, muscle strength, functional status, anthropometry Abstract Objective: To inform selection of physical measures for studies of ARDS survivors within 12 months of ARDS Methods: Secondary analysis of data from 6-month survivors participating in a U.S. multicenter prospective study (ARDSNet Long-Term Outcome Study [ALTOS], N=134) or a multi-site prospective study in Baltimore, MD (Improving Care of Acute Lung Injury Patients [ICAP], N=99).