STS Flashcards
define sit to stand
moving body mass forward from large BOS to small c ext of LE to raise body over feet
define sitting down
moving body mass down from small BOS to large c UE flexing forward and LE flexing to control descend
true or false
sitting down is the reverse of standing up
false
true or false
in sit to stand and sitting down HKA angular displacements are similar
true
muscle activity during sit to stand
iliopsoas - initiates flexion of trunk
major ext force during thigh off - concentric of quads
muscle activity during sitting down
eccentric control of extensors at HKA to control descent
other considerations during sit to stand
momentum
other considerations during sitting down
longer duration d/t lack of visual input
phases of STS
pre-extension phase and extension phase
discuss pre-extension phase of STS
feet moved post to knee
HAT flexion at hips
generation of horizontal linear momentum
discuss extension phase of STS
conversion of horizontal linear momentum to vertical momentum
HKA ext - starts at knees
critical components of STS
foot placed back ng 10 cm and 75° dflexion
flexion of extended HAT at hips
knee hip and ankle ext - at least 3/5 MMT
mechanical requirements of STS
generation of horizontal and vertical momentum
generating and sustaining LE forces
postural stab at thighs-off
discuss significance of foot placement in STS
dictates:
- the distance body has to move forward to pos COM over feet
- amount of muscle force of HKA
BOBATH: standing up 1 foot in front = inc loading on post foot
MRP: sabay
discuss significance of timing and trunk rotation in STS
momentum from HAT is a major contributor to elicit proper ext of LE
inc hip flexion velocity or more horizontal momentum = dec force for LE ext
not too fast and slow: 1-2 secs dapat