Abstract
The aim of this study was to investigate premotor time, motor time and reaction time of the injured and non-injured leg muscles of athletes with chronic ankle instability in response to a visual stimulus during forward jumping. Surface electromyography was performed on injured and non-injured leg of eight athletes with chronic ankle instability during forward jumping. Results showed that premotor time of the peroneus longus was significantly longer in non-injured leg compared with injured leg (489.37±220.22ms vs. 306.46±142.92ms, P=0.031); on the contrary, motor time of the peroneus longus was significantly shorter in non-injured leg compared with injured leg (569.04±318.62ms vs. 715.12±328.72ms, P=0.022). No significant difference was noted in the timing of other calf muscles (P>0.05). According to the results of this study, rehabilitation protocols, regarding ankle instability, need to put greater emphasis on tasks that require proper timing of muscles and muscle re-education so that protocols could reduce residual symptoms after sprain and prevent recurrent sprains.
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