Chapter 14 Flashcards
(15 cards)
Center of gravity
Balance point of the body, linear forces and torque equal zero
How does COG relate to balance
Positioning of the cog depend if it is good or bad
Postural adaptations (front back side)
Front lean back
Back lean forward
Side Lean opposite
Balance vs stability
Balance-control of body with no movement
Stability- if moved it can return back to normal position
If an object is balanced does that mean it’s stable?
No, one legged balance
3 main factors of stability
Size of base of support
Line of gravity within base of support
Cog height
Other factors affecting stability
Mass
Friction
Segmental alignment
Proprioception, vision, vestibular
How does mass affect stability
More mass more stable
How do we challenge the proprioceptive system?
Eyes closed, one leg balance, run
Postural sway
Pendulum like motion of the body
What determines how much postural sway someone has?
Increased age One leg balance Height of cog Eyes closed Neurological impairments
Ankle balance strategies
Slight motion to counteract movement
Hip strategy
Larger disturbances and when ankle fails- someone pushes you
Strength and stability relationship
More stable = more strength
Strength training on unstable surfaces
Unstable less strength but more work on the stabilizing muscles
