RPAs EXPLAINED [Part 3] | Step & Suspensory Strategies

The video tutorial discusses various balance strategies, including ankle, hip, step, and suspensory strategies. It explains the conditions under which each strategy is used, focusing on the step strategy's reliance on the vestibulospinal reflex and muscle activation patterns. The tutorial also covers the suspensory strategy, highlighting its use in activities like skateboarding and football, and the role of proprioception and the vestibular system in detecting perturbations.

What is the primary factor that determines the need for a step strategy?

• Base of support width

• Height of the individual

• Amplitude of perturbation

• Speed of movement

Which muscle is primarily responsible for hip extension during a step strategy?

• Gluteus medius

• Quadriceps

• Gluteus maximus

• Gastrocnemius

What is the role of the gastrocnemius in the step strategy?

• Flexes the hip

• Stabilizes the ankle

• Extends the knee

• Controls anterior tibial translation

In which activity is the suspensory strategy commonly used?

• Running

• Swimming

• Skateboarding

• Cycling

What type of perturbation typically triggers a suspensory strategy?

• Chronic perturbation

• Sudden push

• Acute perturbation

• Quick pull

Which system is primarily involved in detecting perturbations during skateboarding?

• Auditory system

• Visual system

• Vestibular system

• Proprioceptive system

How do proprioceptors influence muscle activation in the suspensory strategy?

• Activate muscles randomly

• Activate muscles in a distal to proximal manner

• Activate muscles in a proximal to distal manner

• Do not influence muscle activation