Posture Flashcards
what changes with movement?
center of mass
where does the BOS extend to and from?
tip of heels to tip of toes
where does the COM sit for a child?
12th vertebra
where does the COM sit for an adult?
S2
how much sway is there in the sagittal plane?
16 degrees
how much sway is there in the frontal plane?
12 degrees
what type of components are ground reaction forces?
verticall
where is the center of pressure in standing?
between feet
where is the center of pressure in unilateral standing?
in foot
when the line of gravity passes through the axis of rotation, what happens?
no gravitational torque,
minimal muscle activity
when the line of gravity is distant from the axis, what occurs?
flexion or extension moment
some rotation
requires muscle activation
during a flexion moment, where is the line of gravity?
posterior
during extension moment, where is the line of gravitY?
anteiror
what occurs during a kyphotic and lordotic posture?
Shortening of C extensors
shortening of hip flexors
stretched C flexors
stretched hip extensors
what occurs during flat back posture?
shortened hamstrings
stretched hip flexors
what occurs during sway back posture?
hamstrings are shortened
lumbar extensors are shortened
neck flexors are stretched
hip flexors are stretched
what occurs during hyperextended knee?
stretch on posterior capsule
line of gravity is far anterior
what happens to the quad activity in hyperextended knee?
decreased
at 15 degrees of knee flexion, what occurs?
increase in quad activity to 22% MVC
at 30 degrees of knee flexion, what occurs?
increase in quad activity to 51% MVC
what occurs during posterior pelvic tilt?
straightening of spine
what occurs during anterior pelvic tilt?
anterior sheer
thoracic kyphosis
cervical spine lordosis
what occurs during kyphosis/dowagers hump/gibbus deformity?
increase in anterior compression
what occurs during forward head posture?
increased c/s lordosis
increase compression of facets
increased extensor muscle activity
