Comparison of the Effect of Core Trunk and Lower Limb Muscle Fatigue on Landing Kinematics and Fear of Movement in Young Athletes with and without Anterior Cruciate Ligament Reconstruction

Comparison of the effect of core trunk and lower limb muscle fatigue on landing kinematics and fear of movement in young athletes with and without anterior cruciate ligament reconstruction. In this study, 84 people participated and were divided into 8 groups of 12: case (two groups of 12 with anterior cruciate ligament reconstruction) and control (two groups of 12 matched healthy people). The participants in the study were randomly divided into two groups: central muscle fatigue (Groups 1) and lower limb fatigue (Groups 2). Each subject was administered the landing error and single-leg landing tests, as well as the Tampa Fear of Motion Score Questionnaire, and the results were recorded as pre-test data. Then, each subject was subjected to fatigue intervention according to the group, and then a post-test was conducted. The results showed that in the post-fatigue stage, there was a significant difference in all research variables between the ACLr1 group with control 1 and control 2, as well as control 1 with ACLr2 and ACLr2 with control 2. (P<0.50). However, no significant difference was observed in the ACLr1 group with ACLr2 and control 1 with control 2 (P>0.50). The results of intra-group comparisons showed that in the post-fatigue stage, there was a significant difference in all research variables between the ACLr1 group with Control 1 and Control 2, as well as Control 1 with ACLr2 and ACLr2 with Control 2 (P<0.50). However, no significant difference was observed in the ACLr1 group with ACLr2 and control 1 with control 2 (P> 0.50). In a general conclusion, the results showed that central and lower limb fatigue leads to changes in landing performance in individuals with ACL reconstruction, which makes it necessary to consider the role of fatigue on landing kinematics and its role in return-to-sports criteria and prevention of re-injury.