jumping/landing

Question 1

___ mass resists upward jumping movement

Answer 1

larger

Question 2

larger mass increases ____ downward to landing

Answer 2

velocity

Question 3

what happens when a femur is disproportionally long to the trunk

Answer 3

excessive knee and back pain

Question 4

when we land are we accelerating or decelerating

Answer 4

decelerate

Question 5

is deceleration eccentric or concentric

Answer 5

eccentric

Question 6

what are the two main bending points when landing

Answer 6

hips and knees

Question 7

how much more is our body weight when landing

Answer 7

3x

Question 8

drop jump landing v step landing

Answer 8

two legs v one

Question 9

positive work is concentric or eccentric

Answer 9

concentric

Question 10

how does impulse aid momentum in jumping

Answer 10

take off

Question 11

how does impulse decrease momentum with jumping

Answer 11

landing

Question 12

what affects moment of inertia the most

Answer 12

distribution of the mass

Question 13

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

Answer 13

height, extension

Question 14

what can reduce GRF

Answer 14

effective instructions and auditory cues

Question 15

reduced and poorly controlled knee flexion in males or females

Answer 15

females

Question 16

ligaments connect

Answer 16

bone to bone

Question 17

main knee ligament

Answer 17

ACL

Question 18

how does an ACL get stretched

Answer 18

femur and tibia go in opposite directions

Question 19

an ACL stretch is what type of force

Answer 19

tensile

Question 20

what does the ACL connect

Answer 20

femur to tibia

Question 21

what does the ACL do

Answer 21

stability, keep tibia from moving forward

Question 22

how is the ACL commonly injured

Answer 22

combined horizontal forces

Question 23

is an ACL tear more common in men or women

Answer 23

women

Question 24

___% of ACL injuries are traumatic

Answer 24

30

Question 25

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

Answer 25

70

Question 26

4 main keys to ACL tear prevention

Answer 26

strength, plyometrics, neuromuscular training, enhance endurance

Question 27

what muscle weakness causes valgus knees

Answer 27

glutes/hip rotators

Question 28

6 proper landing technique

Answer 28

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

Question 29

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

Answer 29

greater

Question 30

___ strength go the knee extensors is crucial to knee function

Answer 30

eccentric

Question 31

glute med action

Answer 31

abduction

Question 32

add/abduction is in what plane and axis

Answer 32

frontal, AP

Question 33

glute max actions

Answer 33

hip extension, ER

Question 34

which muscles are important to reduce knee injuries when lending

Answer 34

glute med, max, piriformis, other hip ER

Question 35

which hip valves group is the largest

Answer 35

flexors

Question 36

when we land properly the moment arm is larger or smaller

Answer 36

smaller

Question 37

what test assesses landing

Answer 37

LESS

Question 38

how do we fix landing issues

Answer 38

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