Angular kinematics of performance + analysis of injury

Question 1

Define ‘Kinematic chain’

Answer 1

The series of movements required to complete a movement task.

Question 2

Who created a 3 phase, 8 stage model for the tennis serve?

Answer 2

Kovacs & Ellenbecker, 2011

Question 3

How do you calculate tangent velocity?

Answer 3

V = r * ω

Question 4

Define the difference between passive and active marker systems.

Answer 4

Passive marker systems use reflective markers to reflect infrared radiation back towards a camera whilst active marker systems use a driver box with connected markers.

Question 5

Explain the difference between chronic and acute injuries.

Answer 5

Chronic injuries are characterised by repeated stress/overuse whilst acute injuries are caused by sudden traumatic events.

Question 6

Identify the two joints in the ankle joint complex.

Answer 6

Talocrural and subtalar (talocalcaneal) joints

Question 7

Where is the talocrural joint located?

Answer 7

Between the distal tibia/fibula and the proximal talus.

Question 8

Where is the subtalar joint located?

Answer 8

Between the distal talus and the proximal calcaneus.

Question 9

What did Ferber et al., (2009) link with chronic injury during running?

Answer 9

• Amount and rate of pronation

- Time to maximal pronation

Question 10

Assuming angular velocity remains constant, how can we manipulate tangent velocity?

Answer 10

Change the radius of rotation. Larger radius = higher tangent velocity.