In the between-group comparison , there was a decrease in pain perception ( P = 0.004 ; F ( 1,38 ) = 9.62 ; R ( 2 ) = 0.20 ) and an increase in the PPT of both SIJs , in the right side ( P = 0.001 ; F ( 1,38 ) = 21.29 ; R ( 2 ) = 0.35 ) and in the left side ( P = 0.001 ; F ( 1,38 ) = 20.63 ; R ( 2 ) = 0.35 ) .