We measured MVPA ( min per day ) and SED-time ( h per day ) by accelerometry , and indices of total ( body weight , fat mass ( FM ) , BF % and FM index ) and abdominal BF ( waist circumference ( WC ) ) using standard procedures in 231 adults ( 41.3 6.4 years ) with parental history of type 2 diabetes ( ProActive UK ) at baseline , 1-year and 7-year follow-up .