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Biomechanics (Year 2) > Jumping > Flashcards

Flashcards in Jumping Deck (12)
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1
Q

Effect of slow or fast stretch shortening cycle on range of movement?

A

Slow SSC (>250 ms) has larger ROM at joints

Fast SSC (<250 ms) has small ROM at joints

2
Q

What is the series elastic component (SEC)?

A

When stretched, stores elastic energy the increases the force produced

3
Q

What is The contractile component (CC)?

A

Is the primary source of muscle force during concentric

muscle action

4
Q

What is the stretch reflex?

A

When muscle spindles are stimulated the stretch reflex is stimulated, sending input to the spinal cord via type Ia nerve fibres.

Neurons in the spinal cord, impulse travels to the agonist causing a reflexive muscle action.

5
Q

Musculotendinous Unit

A

Elastic energy in tendons and muscles is increased with a rapid stretch.

6
Q

Relationship between CMJ and Sprinting?

A

CMJ and 30m sprint performance are significantly correlated

R= -0.60

7
Q

CMJ: Key Phases

A
Quiet Stance
Start of jump
Contact Phase
Take off
Time in air
Landing
8
Q

What sports had highest CMJ and SJ scores?

A

Male Elite weightlifters

9
Q

Jump and reach, effect of including arm swing?

A

inclusion of arm swing can yield an extra 10-15% more height.

10
Q

Practical implications of improving performances?

A

Improve leg strength/power
improve arm strength/power
segmental co-ordination

11
Q

Key joints in jumping?

A

Knee extensors
Ankle plantar flexors
Hip extensors

12
Q

Key Muscles in jumping?

A

Vastus Lateralis
Rectus Femoris
Gastrocnemius
Gluteus maximums