Question

During the downward phase of a countermovement jump please describe the joint actions at the hips, knee, and ankles, the muscles active during the joint actions, and their muscle actions.

Answer 1

During the downward phase of a countermovement jump, the hip joint undergoes flexion, the knee joint undergoes flexion, and the ankle joint undergoes dorsiflexion. The muscles involved in these joint actions include the hip flexor muscles, quadriceps muscles, and calf muscles. The muscle actions during these joint actions are hip flexion, knee flexion, and ankle dorsiflexion.

Step-by-step explanation:

During the downward phase of a countermovement jump, there are specific joint actions at the hips, knees, and ankles. At the hips, the joint undergoes flexion. At the knees, the joint undergoes flexion, and at the ankles, the joint undergoes dorsiflexion.

The muscles involved in these joint actions are:

• At the hips: hip flexor muscles, such as the iliopsoas and rectus femoris
• At the knees: quadriceps muscles, such as the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius
• At the ankles: calf muscles, such as the gastrocnemius and soleus

The muscle actions during these joint actions are as follows:

• At the hips: hip flexion, which involves the activation of the hip flexor muscles
• At the knees: knee flexion, which involves the activation of the quadriceps muscles
• At the ankles: ankle dorsiflexion, which involves the activation of the calf muscles