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Lower limb Muscle Activity During Forefoot and Rearfoot Strike Running Technique.

Authors: Landreneau LL, Watts K, Heitzman JE, Childers WL

Distance running offers a method to improve fitness, but also has a risk of lower limb overuse injuries. Foot strike technique has been suggested as a method to alter loading of the lower limb and possibly minimize injury risk.  However, there is a dearth of information regarding neuromuscular response to variations in running techniques.  The purpose of this investigation was to compare the EMG activity that occurs during FFS running and RFS running, focusing on the biceps femoris, semitendenosis, rectus femoris, vastus medialis oblique, tibialis anterior (TA), medial head of gastrocnemeus (MGas), lateral head of gastrocnemius (LGas), and soleus.  A 3D motion capture system was used to collect kinematic data and electromyography was used to define muscle activity. The authors found that the ankle was significantly more plantarflexed during FFS running (p = .0001) but there were no significant differences in knee and hip angles (p = .618 & .200, respectively).  There was significantly less activity in tibialis anterior (TA) (p < .0001) and greater activity in the MGas (p= .020) during FFS running.  The LGas and soleus did not change activity (p = .437 & .490, respectively).  Therefore, FFS running demonstrated lower muscular activity in the TA and increased activation in the MGas.

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