Mechanical Factors Flashcards

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1
Q

What factors has strength shown to increase?

A

Increases in:

Rate of Force Development, Power, Jump Height

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2
Q

What are the different mechanical, architectural and neural factors?

A

Mechanical –> muscular action, moment arm

Architect –> CSA, pennation angle, fibre type

Neural –> MU’s activated, stimulation frequency

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3
Q

What changes does power and strength training bring to performances?

A

Power –> increase neural drive, force and RFD

Strength –> increase neural drive, RFD and muscle thickness

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4
Q

What are the 3 ways in examining mechanical factors on force generation?

A

Single Fibre (in Vitro - stimulate a single fibre)

Whole Muscle (dependent on fibre type & design)

Joint Level (attached - in Vivo)

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5
Q

What is the difference in single fibre and whole muscle in terms of the force-length relationship?

A

SF = force greatest at intermediate lengths due to increase cross bridge attachments.

WM = combination of contractile and elastic properties -challenged by MTU and fibre length

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6
Q

What is the sticking region?

A

Point in the movement that is the hardest

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7
Q

What is shorter ROM linked to?

A

Improvements in jump height and strength performances

Increase training = angle-specific changes linked to neural control come about

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8
Q

What are some of the mechanical adaptations in terms of the length-tension relationship?

A
  • Rectus Femoris adapts to cope with demands

- Cyclists perform better at shorter RF lengths whereas runners perform better at longer RF lengths

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9
Q

What is the difference between single fibre, whole muscle and joint level in terms of the force-velocity relationship?

A

SF = force exerted lowers as speed of shortening quickens due to limited binding sites

WM = max shortening velocity dependent on fibre type, length, pennation angle - power at max shorten is 1/3 of max velocity

JL = peak torque during concentric lowers as angular velocity quickens - slower this is = increased force

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10
Q

How can types of action affect velocity specificity?

A

1) Eccentric can produce more force than concentric through different mechanisms
2) Eccentric is more efficient
3) Eccentric presents neural control strategies

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11
Q

What are some of the mechanisms proposed from the SSC?

A

1) Reduced metabolic cost
2) Increased time for force generation
3) Increased storage and use of elastic energy

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12
Q

What affect does increasing stiffness/compliance have on our bodies?

A

Stiffness - Reduces contact time
Compliance - enhances performance and force output

Those who have higher stiffness perform better in SSC activities

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13
Q

What is torque variation due to?

A
Attachment location (moment arm. axons)
Contraction of multiple muscles to the net effect of a joint
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14
Q

What is moment arm?

A

Shortest distance from joint centre to the tendon

Affects the magnitude of torque produced by the muscle

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15
Q

What is the calculation for Torque?

A

T = Fd

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16
Q

What is the differences between force/effort arm and resistance arm?

What is needed to overcome resistance torque?

A

Force -> distance from axis to point of force application

Resi -> distance from axis to point of resistance application

Increased effort torque to overcome resistance torque

17
Q

Why are there fluctuations in moment arm? and in what sort of athletes is this common?

A

Moment arm varies over range of movement.

Sprinters have increases in ‘d’ which improves Quad function

18
Q

What do alterations in ‘d’ produce?

A

Increasing ‘d’ = increases force

Reducing ‘d’ = reduces force but good for faster activities

19
Q

What are the physiological consequences of moment arm?

A

Triceps - moment arm is very short distance

Perpendicular from the elbow joint to where the tricep force comes from

20
Q

Is moment arm important?

A

Yes - predicts concentric torque production models