Lecture 4 Postural Control Flashcards
(18 cards)
What is postural control critical to?
Critical to independence in functional task
(Sitting, standing, and walking)
What is postural control
Controlling body’s position in space for dual purposes of stability and orientation
What is postural orientation
Ability to maintain relationships btw the body segments and btw the body and the environment for a task
What is postural stability
Ability to control center of mass (COM) in relationship to base of support (BOS)
what is center of mass
A point at the center of the total body
What is center of gravity (COG)
Vertical projection of the COM
What is base of support
Area of the body in contact with the support surface
What is center of pressure
Center of distribution of the total force applied to the supporting surface
Both the task and the ___ influence the orientation and stability demands of the task
Environment
What are the individual systems for postural control
- Ability to control body’s position in space
- MSK components (joints, spine, muscles)
- Neural components
What are the 3 task constraints
Balance control
Feedback control
Feed forward control
What is balance control
Steady-state, reactive and proactive
What is feedback control
Occurs in response to sensory feedback from an external perturbation
What are feedforward control
Anticipatory postural adjustments made in anticipation of a voluntary movement
What is steady state balance
Body alignment can minimize the effect of gravitational forces
What is background muscle tone
Normal state of all muscles
What postural tone
Activation of anti-gravity muscles
What are stability limits
Point at which a person will change the configuration of BOS to achieve stability
- not fixed boundaries
