Seventy-three patients ( meanSD , 5512years ) with overweight ( body mass index ( BMI ) , 34.54.8 ) and moderate or severe OSAS ( Apnea-Hypopnea Index , 41.720.9 ) scheduled for CPAP prescription were randomized to a control group ( CPAP and advice on the association between weight and OSAS ) or an experimental group ( CPAP and a 6-month behavioral medicine intervention targeting PA and EB ) .