... USA2Department of Work Stress Control, Japan National Institute of Occupational Safety and Health, 6-2 1-1 Nagao, Tama-ku, Kawasaki, 21 4-8 585, Japan3Pain and Fatigue Study Center, Department of ... and hypopnea lasting at least 10 sec-onds or airflow suggesting flow limitation lasting at least 10seconds associated with an arousal. Apnea was defined as a reduction in airflow to less than ... Krieger AC, Rosen A, O'malley RL, Rap-oport DM: Non-invasive detection of respiratory effort-relatedarousals (RERAs) by a nasal cannula/pressure transducersystem. Sleep 2000, 23:76 3-7 71.21....