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biomechanics > jumping/landing > Flashcards

jumping/landing Flashcards

1
Q

___ mass resists upward jumping movement

A

larger

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2
Q

larger mass increases ____ downward to landing

A

velocity

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3
Q

what happens when a femur is disproportionally long to the trunk

A

excessive knee and back pain

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4
Q

when we land are we accelerating or decelerating

A

decelerate

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5
Q

is deceleration eccentric or concentric

A

eccentric

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6
Q

what are the two main bending points when landing

A

hips and knees

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7
Q

how much more is our body weight when landing

A

3x

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8
Q

drop jump landing v step landing

A

two legs v one

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9
Q

positive work is concentric or eccentric

A

concentric

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10
Q

how does impulse aid momentum in jumping

A

take off

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11
Q

how does impulse decrease momentum with jumping

A

landing

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12
Q

what affects moment of inertia the most

A

distribution of the mass

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13
Q

ground reaction force (GRF) increase with landing ____ and knee ____

A

height, extension

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14
Q

what can reduce GRF

A

effective instructions and auditory cues

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15
Q

reduced and poorly controlled knee flexion in males or females

A

females

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16
Q

ligaments connect

A

bone to bone

17
Q

main knee ligament

A

ACL

18
Q

how does an ACL get stretched

A

femur and tibia go in opposite directions

19
Q

an ACL stretch is what type of force

A

tensile

20
Q

what does the ACL connect

A

femur to tibia

21
Q

what does the ACL do

A

stability, keep tibia from moving forward

22
Q

how is the ACL commonly injured

A

combined horizontal forces

23
Q

is an ACL tear more common in men or women

A

women

24
Q

___% of ACL injuries are traumatic

A

30

25
Q

___% of ACL injuries are non-contact (atraumatic)

A

70

26
Q

4 main keys to ACL tear prevention

A

strength, plyometrics, neuromuscular training, enhance endurance

27
Q

what muscle weakness causes valgus knees

A

glutes/hip rotators

28
Q

6 proper landing technique

A

shoulders over knees
COG between base of support
feet shoulder width apart
no values at knees
knee in line with foot
soft landing, bend knees

29
Q

heel toe landing results in ____ GRF compared to toe heel landing

A

greater

30
Q

___ strength go the knee extensors is crucial to knee function

A

eccentric

31
Q

glute med action

A

abduction

32
Q

add/abduction is in what plane and axis

A

frontal, AP

33
Q

glute max actions

A

hip extension, ER

34
Q

which muscles are important to reduce knee injuries when lending

A

glute med, max, piriformis, other hip ER

35
Q

which hip valves group is the largest

A

flexors

36
Q

when we land properly the moment arm is larger or smaller

A

smaller

37
Q

what test assesses landing

A

LESS

38
Q

how do we fix landing issues

A

strengthen glutes, increase hip mobility, coach, feedback, plyometrics

biomechanics (14 decks)

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