tokens: Regional analysis showed a reduction in the worst affected segment 15 and 30 minutes after exercise ( - 27 . 9 ( 7 . 2 ) % and - 28 . 6 ( 5 . 7 ) % , both p < 0 . 01 ) , and at 30 minutes after dobutamine ( - 32 ( 5 . 3 ) % , p < 0 . 01 ) .