Squat/Lift Flashcards
Squatting Characteristics
Hip strategy: initiate w/ hip fwd trunk as hips move back GRF farther from hip than knee knees over toes Maintain neutral spine
if vert tibia: COM way back
ex: wall squat strengthens quad not hip
Lifting characteristics
Initiate at hip
Simultaneous hip back trunk fwd
Neutral spine: erector spinae isomet then concent at end
Back muscles dont do actual lifting
Why asses squats
Common exercise ADL Sit-stand/lifiting motion Preferred strategy Produces LE sx- knee pain
Squat
Phases
Lowering: initial stand to peak knee flex
Elevation: Peak knee flex to standing
Squat
Objectives
WB stability
Elevate/lower COM
Squat
WB Stabil Critical events
Hip Stability: neutral hip in frontal/transverse plane
Trunk Stability: neutral spine in saggital plane
Squat
COM Critical events
Equal use hip/knee extensors- hip strategy
Squat
Trunk Stability
Neutral Spine:
flexion torque- wt in front of spine
greatest torque is at thoracis- traps/rhombs working
Lumbar flexed: more torque on muscles, lordotic curve moves from GRF
maintin neutral via trunk muscles: abs, oblqs, back extens to isometrically stabilize trunk
Knee strategy
squat Problems
More likely into valgus: abductors arent used- lose control over secondary plane
Lead with knees: run out of DF range- heels off ground
Try to protect back: squat with upright trunk
Lifting
Phases
Lowering: initial stand to contact with object
Elevation: contact with object to standing
Lifiting
Objectives
WBS
Elevate/Lower COM
Lifting
WB Stability
Hip Stability: neutral hip in frontal plane
Trunk Stability: neutral spine in saggital
Lifting
COM
Equal use hip/knee extensors (hip strategy)
Knee Strategy
Lifting Problems
Want weight as close to body as possible: lever arm increases as lean forward
Lead with knee: not sitting to get close, instead flex spin to reach
Rounded back: extend concentrically to get up
Torque/Moment
rotational potential of forces about axis
F x Lever arm= moment
