The Relationship Between Lower Extremity Muscle Activity and Knee Flexion Angle During a Jump-landing Task

The Relationship Between Lower Extremity Muscle Activity and Knee Flexion Angle During a Jump-landing Task

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Objective. To determine relationships between lower extremity muscle activity and knee flexion angle during a jump-landing task. Subjects. Thirty recreationally active people free from previous ACL injury. Methods. Muscle activity of the lower extremity and knee flexion angle were recorded during 10 trials of the jump-landing task. Data was analyzed using correlation and multiple regression statistical analyses. Results. Eight significant negative relationships were found, VMO, GMAX activity and Q:H ratio with knee flexion angle at initial contact (VMO: r = -0.382, P = 0.045, GMAX: r = -0.385, P = 0.043, Q:H ratio: r = -.442, P = .018). VMO, VL, and GMAX activity with peak knee flexion angle (VMO: r = -0.687, P = 0.00, VL: r = -0.467, P = .011, GMAX: r = -0.386, P = 0.043). VMO and VL activity with knee flexion displacement (VMO: r = -0.631, P= 0.00, VL: r = -0.453, P = 0.014). Q:H ratio and GMAX activity predicted 34.7% of knee flexion angle variance at initial contact (R2 = 0.347, P = 0.006). VMO activity predicted 47.1% of peak knee flexion angle variance (R2 = 0.471, P = 0.000). VMO and VL activity predicted 49.5% of knee flexion displacement variance (R2 = 0.495, P = 0.000). Conclusions. Increased quadriceps and GMAX activation, with a lack of hamstring and gastrocnemius activation, showed a relationship with decreased knee flexion angle and we speculate this movement pattern to be a potential risk-factor for ACL injury.For the gluteus maximus MVIC, the subject was positioned on a table prone, knee flexed to 90 degrees, with a strap placed over the ... These testing positions are similar to the manual muscle tests described by Hislop and Montgomery ( Hislop, anbsp;...


Title:The Relationship Between Lower Extremity Muscle Activity and Knee Flexion Angle During a Jump-landing Task
Author: Meghan C. Walsh
Publisher:ProQuest - 2008
ISBN-13:

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