Week 10 Flashcards
(16 cards)
1
Q
GPS
A
measure position latitude and longitude via satellite system
2
Q
positional differentiation
A
- fixed location reference to correct orbiting satellite error (precise location and distance in sport)
3
Q
doppler effect/shift
A
- measure change in signal frequency
4
Q
how accelerometers work
A
IMU example
- measures gravity / how much sensor yields or bends
- how much metal compresses sensor
- use electrodes to measure g-force and gauge acceleration
5
Q
player load
A
- sum of all accelerations from all three planes for IMU device
6
Q
sequence of kicking
A
- preparation (role of step length)
- angle of approach (best when square to target)
- backswing (max hip extension and knee flexion)
- forward swing (summation of velocity)
- impact (basic projectile motion)
- follow through (foot in contact longer and dissipate force)
7
Q
how to shoot farther in basketball
A
- greater lower limb contribution (knee and hip flexion)
- joint angular velocity increase
- elbow peak velocity increase before shoulder
- lower release angle for greater horizontal velocity
- high velocity of throw
8
Q
female difference with shooting joint angles
A
- backward trunk lean and larger shoulder flexion angle for release height while males has vertical trunk and shoulder/elbow/wrist alignment
9
Q
ACL anatomy
A
- attaches to anterior intercondylar area of tibia
- posterior and laterally upwards
- attaches to medial side of lateral condyle
10
Q
ACL role
A
- prevent forward sliding of tibia in femur in flexion
- check hyperextension
- lax in flexion and taught in extension
- resist translation of tibia while hamstrings and quads provide support
11
Q
ACL injury mechanisms
A
- sidestepping
- knee valgus and internal rotation (running)
- further loading 0-30 degree knee flexion
- slight knee flexion, abduction movement and internal rotation transverseally during movement/sidestepping
12
Q
ACL risk factors
A
- sport (winter sport, basketball/lateral movement sports)
- female (higher q angle)
- kinematics - decreased knee flexion and increase knee abduction
13
Q
PCL anatomy
A
- attaches to posterior intercondylar area of tibia
- travel anteriorly and medially upwards
- attach to lateral side of medical femoral condyle
- stronger than ACL
14
Q
PCL role
A
- prevent backward movement of tibia
- forward sliding of femur
- prevent knee over-flexion
15
Q
PCL injuries
A
‘ruckman’s curse’
- frontal collision of bent knee (femur in sliding motion)
- heavy landing following fall or collision)
16
Q
how to reduce risk of PCL
A
- lower limb strengthening
- muscle activation strategies
- education and training on landing
- more knee flexion
- trunk or torso position (lean in desired direction)
- foot placement closer to midline and decrease knee abduction load)
