The PPTs increased significantly more among the SAI group compared with the control group ( P < @ ) for the abductor digiti minimi ( mean difference , @ kPa ; @ % CI : @ , @ kPa ) , tibialis anterior ( mean difference , @ kPa ; @ % CI : @ , @ kPa ) , medial gastrocnemius ( mean difference , @ kPa ; @ % CI : -@ , @ kPa ) , and erector spinae ( mean difference , @ kPa ; @ % CI : -@ , @ kPa ) .