There has been an abundance of research investigating risk factors for anterior cruciate ligament (ACL) injury and demonstrating the importance of biomechanical characteristics, particularly in females. However, there have been many different landing tasks used with varying demands. Previous research has demonstrated that different landing tasks significantly alter demand and biomechanical characteristics. However it is unknown how changes in landing demand using the same task may alter landing biomechanics related to ACL injury. Therefore, the purpose of this study was to examine the effects of jump distance during a double-leg stop-jump on biomechanical risk factors of ACL injury and muscle activation and examine the contribution of sensorimotor characteristics on these biomechanical characteristics.
Fifty-three recreationally active healthy females were recruited to participate in this study. Each participant underwent a single test session that included demographic and anthropometric assessment, dominant knee threshold to detect passive motion, landing biomechanics and muscle activation measurement, and dominant knee time to peak torque and peak torque testing. Biomechanical and muscle activation parameters relative to ACL injury were compared between jump distances using repeated measures ANOVA. Multiple linear regression was used to assess the relationship between the biomechanical characteristics and sensorimotor characteristics (threshold to detect passive motion, time to peak torque, and peak torque).
The results of this study demonstrated that increases in jump distance significantly increased landing demand and significantly impacted risk factors for ACL injury and muscle activation strategies. These findings illustrated that studies utilizing tasks with different demands cannot directly compare results or make inference to injury risk based previous findings. This study suggested that a jump distance of 40% to 60% body height is used during a double-leg stop-jump task to assess landing biomechanics related to ACL injury. Additionally, sensorimotor characteristics had significant relationships with knee flexion angle at initial contact, peak knee flexion, and peak knee abduction moment. Further research is needed to identify sensorimotor characteristics that contribute to frontal plane knee motion during landing.
|Advisor:||Sell, Timothy C.|
|School:||University of Pittsburgh|
|School Location:||United States -- Pennsylvania|
|Source:||DAI-B 77/08(E), Dissertation Abstracts International|
|Keywords:||ACL, Biomechanics, Knees, Landing, Proprioception, Sensorimotor|
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