Use the following three figures to answer the following two questions. Question

Question

Use the following three figures to answer the following two questions.

Question 1: Focus on the maximum EMG tracing for the gastrocnemius (GA) and tibialis anterior (TA) muscles in Figure 3. Explain what accounts for the increase in EMG tracing for these two muscles between walking and running in the context of concentric, eccentric, and isometric contraction during dorsiflexion and plantarflexion of the ankle.

Question 2: Explain the relationship between innervation of the tibialis anterior muscle (provided by the deep peroneal nerve) and its EMG tracing.

Initial Contact (Heel strike) .HIP: 25° flexion ·KNEE: 0°-5·ANKLE: 0° (90 *) Hip stabilized by extensor activity of hamstrings and gluts Knee stabilized by cocontraction of quads and hamstrings Ankle pre-tibial muscles dorsiflex ankle, positioning foot for initial contact. Figure 1. Muscle groups involved with the initial heel strike phase.

Explanation / Answer

1. EMG tracing is maximum during running as compared during walking in case of GA EMG shows fluctuation during stance phage and TA shows chages during initial stance and Deceleration phage.

2. As we know the TA is responsible for ankle dorsiflexion which is maximum at heel strike during initial stance so that the EMG shows fluctuation during that period and during runing the fluctuation is maximum places as DF occurs many times

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