The exercise group showed an exercise-induced reduction in total CTT ( baseline : 54.2 8.0 vs 30.3 6.1 ) , which was significantly different from that experienced by the control group over the 12-wk period ( 48.6 9.3 vs 48.3 12.3 ; P = 0.027 ) ; however , the exercise-induced decreases in CTT involving the three colonic segments examined ( right , left and recto-sigmoid ) showed no significant differences from the control group .