Objective. To determine the effect of induced gastrocnemius/soleus tightness on lower extremity kinematics and muscle activity. Design. Cross-sectional. Subjects. Healthy recreationally active subjects (n = 30, mean Height +/- SD = 173.5 +/- 12.1, Mean Weight +/- SD = 72.0 +/- 16.4). Measurements. Clinically measured dorsiflexion was assessed prior to collection of kinematic data. Participants performed five trials of an overhead squat with a 10 degree incline wedge placed under each foot (wedge condition) and without the wedge (no wedge condition). Three dimensional kinematics for the hip, knee, and ankle and electromyography of the VL, VMO, lateral gastrocnemius, and soleus were collected during the squatting tasks. Separate repeated measures ANOVAs were performed to determine differences in kinematics and EMG during the wedge and no-wedge conditions. Results. During the wedge condition, sagittal and frontal plane motion at the knee and muscle activity of the vastus medialis oblique, vastus lateralis, and soleus, were significantly different as compared to the no wedge condition. Conclusion. Based on our findings, limiting dorsiflexion range of motion leads to compensations at the knee and changes in muscle activity in the lower extremity that may have implications in overuse and acute knee injury.repeated three times each for gastrocnemius and soleus flexibility measures. ... were reinforced with pre- wrap and athletic tape and were verified and checked for cross-talk with manual muscle testing prior to moving on with data collection.
|Title||:||The Relationship Between Dorsiflexion Range of Motion and Lower Extremity Movement Patterns and Muscle Activation|
|Author||:||Elisabeth Corliss Macrum|
|Publisher||:||ProQuest - 2008|