postural control = controlling the body's position in space for dual purpose of
________________ and __________________
stability, orientation
______________________ is critical to independence in functional tasks (sitting, standing,
walking, reaching, grasp)
postural control
____________________ is the ability to "not fall over"; the ability to control the center of
mass (COM) in relationship to the base of support (BOS)
postural stability
_____________________ is the ability to maintain the relationship between body segments
and between body and environment for a task
postural orientation
__________________ is the ability to orient the body in relation to the line of gravity
postural verticality
T/F: all tasks require postural control
true
,Where is the COM usually located in an adult?
S2
Center of Mass (COM) is a point at the center of ____________________
total body mass
What is Center of Gravity?
vertical projection of COM
What is Base of Support (BOS)?
area of body in contact with support surface
What is Center of Pressure (COP)?
center of distribution of total force applied to supporting surface
Postural verticality requires what 3 systems to function correctly?
vestibular, visual, somatosensory
A systems framework suggests that postural control AKA balance (like all aspects of
motor control) emerges from an interaction of what 3 things?
task, individual, environment
systems framework: what 3 categories fall under postural tasks?
steady state, proactive, reactive
systems framework: what 3 categories fall under individual?
motor, sensory, cognitive
, systems framework: what 3 categories fall under environment?
sensory context, support surfaces, cognitive load
Task and environment influence ___________ and ____________ demands of a task
orientation, stability
Specific orientation and stability requirements vary according to what?
task and environment
What is steady state?
ability to control COM relative to BOS in predictable and non-changing conditions
examples of steady state tasks
sitting, standing, walking at a constant speed
What is proactive (anticipatory) balance control?
ability to activate muscles in the legs and trunk for balance control in advance of
potentially destabilizing voluntary movements
examples of tasks that require proactive (anticipatory) balance control
stepping up onto a curb, lifting a bag of groceries
What is reactive balance control?
ability to recover a stable position following non-expected pertubation
examples of tasks that require reactive balance control
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