FS Balance and Coordination

the maximum distance a person can intentionally move or displace his/her COM in each direction without losing balance or taking a step/repositioning the feet.

Limit of Stability (LOS)

In a healthy adult, the LOS in standing is how large in the AP direction?

12 degrees

In a healthy adult, the LOS in standing is how large in the ML direction?

16 degrees

When a pertubation is small, you utilize the _____ strategy to maintain/regain stability.

ankle

Can you sway more forwards or backwards?

Forwards (d/t direction of foot projection)

To maintain balance, we have to keep our ______ _____ _____ _______.

COM over our BOS

T/F: If a platform you are standing on is pulled backward, you natural sway will be backward and your compensatory response will be forward.

False

Older adults typically choose to utilize which reactive control strategy? (hip or ankle)

Hip

What did the cell say to his sister when she stepped on his foot?

Mitosis

T/F: PD have a decreased sway during quiet stance which makes it harder for them to initiate gait.

True

T/F: PD patient's agonist and antagonist muscles are turning on more than necessary and don't have correct timing in sitting.

True

T/F: Touch contact w/ cane is enough to reduce postural sway.

True

During hip strategies which two muscles activate first?

abdominals and paraspinals

Is the ankle strategy activation distal-proximal or proximal-distal?

distal-proximal

If the platform you are standing on is pulled backward, your natural reaction to the sway ______ and to counteract that, you need to produce a ______ sway.

forward, backward

During ankle strategy, what muscles (2) are activated first?

gastroc and anterior tibialis

It is easier to control our COM if our BOS is ______.

large

Is the hip strategy activation distal-proximal or proximal-distal?

proximal-distal

if your COM goes outside of your BOS, you will need to perform a _______ strategy to regain balance.

stepping

This reactive control strategy realigns COM within BOS by using rapid steps in the direction of the displacing force.

stepping strategy

3 sensory inputs used to achieve balance/equilibrium

visual, vestibular, somatosensory