Balance: Exam 1 Flashcards
Balance is controlling ______ OVER ________ in ANY GIVEN SENSORY ENVIRONMENT
COG over BOS
Motor plans are ___________
Goal driven!!!
“where do I want to be?”
“What do I want to do?”
NORMAL execution req’s these things
- ROM
- strength/endurance
- feet
- ankles
- hips
- trunk
- neck
- eyes
Balance is common among MANY dx’s
Is knowing the dx important?
ex’s
- MS
- progressive
- TBI
- one time thing
- cerebellar strokes vs. peripheral vestib dysf.
- these can be similar dysf’s
Balance and the ICF model
- body structure/function
- balance contributes to a LARGER scale!!!
Terms involved w/ Balance
COG
BOS
Limits of Stability—how far can they go w/out feeling unstable?
COG
*where avg mass is loc’d*
pt @ which ALL wt of object can be considered concentrated
normal or avg loc?
see pics
When COG is IN BOS====>
Stability
BOS
*think surface
Surface that experiences pressure as the result of weight and gravity, and the area contained therein
Limit of Stability or
LOS
farthest dist a person can what?
- Farthest dist. in any direction a person can lean (away from midline) w/out altering original BOS by stepping, reaching or falling
Pt @ which you cannot catch balance w/out moving feet or re-positioning
What direction is usually the furthest LOS?
FRONT
3 VARIABLES that affect balance
- surface cond’s
- visual envir’s
- Intentions/task choice
Demands of the system
NOTE: fluctuate continuously, producing CHANGING DEMANDS on the systems that control balance
- Loc. of COG, BOS, LOS
- surf cond’s
- visual envir’s
- intentions/task choices
Sensory Systems:
Peripheral (3 components)
- Somatosensory
- Visual
- Vestibular
Sensory Systems
Central (3 components)
- compares sides body + diff sensory modalities
-
integrates sensory info
- compares 3 sensory comps
-
resolution of sensory conflict
- NOTE: motion sickness is an INABILITY to resolve this conflict
Somatosensation is made up of….
proprio
kinesthesia
Somatosensation comes from your what?
joints
ligs
mm’s
skin
Somatosensation provides info about mm _________ and joint__________
mm length, stretch,
joint pos. and pressure
2 roles of vision:
Central (focal)
Peripheral (ambient) or perception of mvmt
2 components of Central vision (Focal)
- environment orientation and perception of verticality
- obstacle motion and avoidance
Peripheral vision of ambient
PERCEPTION OF MVMT
detects what?
- detects motion of SELF in relation to the environment
Vestibular
provides info regarding what and during what?
- regarding:
- head pos. in relation to gravity
- during:
- linear and rotary mvmt
This type of perception compares input w/ 3 systems:
*NOTE: brain performs BEST w/ input from ALL systems
Central Sensory perception
Central Sensory perception
Conflict
- brain recognizes these “discrepancies” and selects the BEST input
Central Sensory Perception
Unresolved sensory conflict
impaired balance
dizziness
nausea
vomiting
Remember the Systems Model !!!
see pics
Balance===result of interactions b/w individual, task, environment that you perform the task in
The Systems model
what is the cycle driven by?
- purposeful choices of the indiv. and demands placed ON the indiv. by the environment
Systems Model for Balance
*remember the basics—–>
Plan—-> Execution
see pics
Motor Planning and Execution
Consists of Reflexes and 3 diff. types of postural responses
- Automatic
- Anticipatory
- Volitional
*ALL dependent on task/goal
VOR and VSR contribute to orientation of:
eyes
head
body
VOR
what does it do and what is the input vs. output
INPUT: vestibular
OUTPUT: ocular
aligns head in pos. while the eyes are moving
***remember hockey game ex. Dr. Najeeb
VSR
what does it do and what is the input vs. output
INPUT: vestibular
OUTPUT: spinal
maintains posture (spinal) in resp. to same input (vestibular)
AUTOMATIC Postural Resp’s
- Righting rxns
- postural/balance strats.
“Righting” Rxns aka
straightening things out
Righting rxns
*remember…..this is like when someone is talking to you so you turn your head to see them and the body stays facing one way….but then eventually we turn our whole body that way as a righting rxn
Orientation of the head and trunk
fixing our body to match where our gaze is going!!!
3 types of Righting
- Optical and Labyrinthine righting
- labyrinthine==inner ear
- Body-on-head righting
- head/body alignment
- Body-on-body righting
- upper/lower body alignment
**ALL keep head/neck UPRIGHT relative to ground
Optical & Labyrinthine Righting
- Vestib tells us which way gravity pulling
-
VIS + VESTIB===checks body tilt, keeps eyes in line w/ horizon
- so if we are tilted or leaning over, it keeps our eyes in line w/ horizon
Auto. Postural Responses are NOT
quick reflexes