Muscle Timing in Injured and Non-Injured Leg of Athletes With Chronic Ankle Instability in Response to a Visual Stimulus During Forward Jumping Publisher Pubmed



Fereydounnia S¹ ; Shadmehr A¹ ; Talebian Moghadam S¹ ; Olyaei G¹ ; Jalaie S¹ ; Tahmasebi A²
Source: Journal of Bodywork and Movement Therapies Published:2016

Abstract

Objective: 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. Methods: Surface electromyography was performed on injured and non-injured leg of eight athletes with chronic ankle instability during forward jumping. Results: Results showed that premotor time of the peroneus longus was significantly longer in non-injured leg compared with injured leg (489.37 ± 220.22 ms vs. 306.46 ± 142.92 ms, 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 ± 318.62 ms vs. 715.12 ± 328.72 ms, P = 0.022). No significant difference was noted in the timing of other calf muscles (> 0.05). Conclusion: 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. © 2015 Elsevier Ltd.