10 - Understanding Movement Patterns Flashcards

1
Q

Which muscles are involved in the stretch-shortening cycle?

A

Gluteus maximus, quadriceps, soleus, gastroc

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2
Q

What is the stretch-shortening cycle responsible for?

A

making movements more efficient

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3
Q

What happens to the metabolic cost of running due to the stretch-shortening cycle?

A

-reduced by 30%

due to the elastic energy storage and return in tendons of the leg reduces work done by muscles

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4
Q

Which tendons are involved in the stretch-shortening cycle?

A

Achilles tendon, patella/quadriceps tendon, plantar fascia

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5
Q

What is the body considered as during the flight phase of a jump?

A

a projectile

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6
Q

What is jump height determined by?

A

the take-off velocity

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7
Q

What is take-off velocity determined by?

A

the power generated by the leg extensor muscles during the concentric phase of the take off

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8
Q

When does peak power occur?

A

1/3 max shortening velocity

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9
Q

How does the stretch-shortening cycle increase jump height?

A
  • during the counter movement the extensor muscles of the lower limbs are stretched in the eccentric phase
  • this can enhance the force output
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10
Q

Why is muscle tendon unit shortening increased?

A

due to the recoil speed of the tendon

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11
Q

How is force maximised?

A
  • a larger stretch will sore more elastic energy
  • the quicker the changeover
  • there is an optimal size of stretch
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12
Q

What is the optimum size of the stretch?

A
  • too small = more energy could have been stored

- too much = speed of changeover is likely to decrease

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