RPAs EXPLAINED [Part 2b] | Hip Strategies

The video tutorial explains the hip strategy used for balance control, focusing on muscle activation in response to different perturbations. It covers posterior, anterior, and lateral directed perturbations, detailing how muscles like the paraspinals, hamstrings, rectus abdominis, and obliques are activated to maintain balance. The tutorial emphasizes the importance of a narrow base of support and the role of the vestibular apparatus in detecting shifts in the center of gravity.

What is the primary factor that elicits a hip strategy in balance control?

• Wide base of support

• Low center of gravity

• High center of gravity

• Narrow base of support

Which sensory system is primarily responsible for detecting shifts in the center of gravity during a hip strategy?

• Auditory system

• Visual system

• Vestibular apparatus

• Somatosensory system

During a posterior directed perturbation, which muscle group activates first to control the shift in the center of gravity?

• Abdominals

• Gluteus maximus

• Paraspinals

• Quadriceps

In an anterior directed perturbation, which muscle acts as a hip flexor?

• Paraspinals

• Gluteus medius

• Hamstrings

• Rectus femoris

What is the main difference in movement range between anterior and posterior directed perturbations?

• Posterior has a larger range

• Both have the same range

• Neither involves movement

• Anterior has a larger range

In a laterally directed perturbation, which muscles are primarily responsible for returning the body to a neutral position?

• Ipsilateral muscles

• Contralateral muscles

• Anterior muscles

• Posterior muscles

Why does the contralateral knee bend during a lateral shift in balance?

• To maintain a straight posture

• To decrease weight bearing on the same foot

• To increase weight bearing on the opposite foot

• To increase the range of motion