After a 4-wk run-in period , 103 participants ( 72 male , 31 female , 39-70 yr , mean + / - SD body mass index = 32.9 + / - 5.7 kg x m ( -2 ) ) were randomly assigned to four groups for 22 wk : aerobic training , resistance training , combined aerobic and resistance exercise training , or waiting-list control .
