METHODS	We conducted a multicenter randomized controlled trial in Canada between 2003 and 2005 that randomly assigned 242 breast cancer patients initiating adjuvant chemotherapy to usual care ( n = 82 ) , supervised resistance exercise ( n = 82 ) , or supervised aerobic exercise ( n = 78 ) for the duration of their chemotherapy ( median , 17 weeks ; 95 % CI , 9 to 24 weeks ) .\