The relationship between dorsiflexion range of motion and lower extremity movement patterns and muscle activation

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Macrum, Elisabeth Corliss
- Affiliation: College of Arts and Sciences, Department of Exercise and Sport Science

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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 plus minus SD = 173.5 plus minus 12.1, Mean Weight plus minus SD = 72.0 plus minus 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.

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	The relationship between dorsiflexion range of motion and lower extremity movement patterns and muscle activation	2019-04-10	Public	Download