A randomized controlled blinded study in patients treated for Acute Respiratory Distress Syndrome (ARDS) in the mixed medical-surgical intensive care units (ICU) of four academic teaching hospitals in Tehran, Iran were conducted to examine the effects of Varied Rehabilitation Techniques on Survivors of ARDS patients. Patients were randomized in the emergency department at the time of ICU admission to one of four groups labeled groups 1, 2, 3 and 4, respectively.