Comparison of Rate of Loading and Frequency Contents of Impact Force between Dominant and Non-Dominant Leg during Anticipated and Unanticipated Sidestep Cutting Tasks

It is reported that a large number of anterior cruciate ligament injuries occurred in effect of impact forces during sidestep cutting. The purpose of this study was comparing loading rate and frequency contents between dominant and nondominant leg during sidestep cutting in anticipated and unanticipated tasks. Squash team players have done side step cutting in direction of dominant and nondominant leg in anticipated and unanticipated situations. The results showed there is no interact effect between dominance and anticipation. The peak of Instantaneous loading rate was higher in nondominant leg. The bandwidth frequency in dominant leg was higher. The frequency of 99.5% of power spectrum was higher in unanticipated sidestep cutting. Also the bandwidth frequency was higher in the anticipated situation. Therefore loading rate and frequency contents can illustrate the functional differences between dominant and nondominant leg. Also, frequency contents can be considerable as risk factors in unanticipated situations.