The PPTs increased significantly more among the SAI group compared with the control group ( P < .05 ) for the abductor digiti minimi ( mean difference , 82 kPa ; 95 % CI : 6 , 157 kPa ) , tibialis anterior ( mean difference , 125 kPa ; 95 % CI : 20 , 230 kPa ) , medial gastrocnemius ( mean difference , 83 kPa ; 95 % CI : -6 , 171 kPa ) , and erector spinae ( mean difference , 86 kPa ; 95 % CI : -17 , 188 kPa ) .