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 @ adults ( @ @ years ) with parental history of type @ diabetes ( ProActive UK ) at baseline , @-year and @-year follow-up .