RPAs EXPLAINED [Part 1] | Ankle Strategies

The video tutorial explains ankle strategies used to maintain balance during small perturbations. It covers the role of proprioceptors in detecting shifts in the center of gravity and the sequence of muscle activation from distal to proximal. The tutorial details how different perturbations (anterior, posterior, lateral) affect muscle activation, emphasizing the importance of a wide base of support and small perturbation amplitude. It also introduces the concept of muscle groups like triceps surae and tibialis anterior in maintaining balance.

What is the primary function of proprioceptors in the ankle joint?

• To detect changes in temperature

• To sense the relative position of the ankle

• To measure blood flow

• To control muscle contraction

Which condition is necessary to elicit an ankle strategy?

• A fast movement

• A narrow base of support

• A wide base of support

• A high amplitude perturbation

Which strategy is used when the perturbation amplitude is too large for an ankle strategy?

• Hip strategy

• Suspensory strategy

• Jump strategy

• Step strategy

In an ankle strategy, which muscles are activated first?

• Distal muscles

• Abdominal muscles

• Proximal muscles

• Shoulder muscles

Which muscle group is primarily responsible for correcting anteriorly directed perturbations?

• Quadriceps

• Hamstrings

• Triceps surae

• Biceps

What happens to the heel during a small perturbation in an ankle strategy?

• It remains on the ground

• It lifts off the ground

• It moves laterally

• It rotates

What challenge might individuals with limited dorsiflexion face during posterior perturbations?

• Increased muscle strength

• Enhanced proprioception

• Difficulty maintaining balance

• Inability to plantar flex

Which muscle is primarily activated during posteriorly directed perturbations?

• Soleus

• Gastrocnemius

• Rectus femoris

• Tibialis anterior

What is the role of the tibialis posterior during lateral perturbations?

• To invert the subtalar joint

• To evert the subtalar joint

• To flex the knee

• To extend the hip

During a right lateral ankle strategy, which muscles are used to correct eversion?

• Hamstrings

• Quadriceps

• Fibularis longus and brevis

• Tibialis anterior