The BFR training program was effective in increasing the maximal dynamic strength in both the leg-press ( 19.6 % , P < 0.001 ) and knee-extension exercises ( 25.2 % P < 0.001 ) , as well as in the timed-stands ( 15.1 % , P < 0.001 ) and timed-up-and-go test ( -4.5 % , P = 0.002 ) .