Biomechanics and movement Flashcards

1
Q

What is Movement, (definition)

A

Movement, or motion, is the state of changing something’s place, position or posture, in relation to the environment.

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2
Q

Principles of movement

A

does it look Smooth, effortless, is it effective, does it look disjointed?

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3
Q

What factors influence effect movement?

A

strength / endurance
posture/self carriage
Awareness (proprioception, interoception, kinasthesia)
Functional mobility
Recruitment pattern
Balance
Neuromuscular responses
Kinematic sequencing, timing and co-ordination
Dissociation
Flexibility
Confidence, beliefs, attitudes, intention, motivation

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4
Q

What effect does poor posture have on movement?

A

Doesn’t enable as much:

smooth movement,
Range of movement

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5
Q

What effect does proprioception have on movement?

A

Need to be aware of what our body is doing to move effectively at any one time

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6
Q

What effect does functional ability have on movement?

A

enables us to carry out tasks that we want to or need to do

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7
Q

What effect does recruitment pattern have on movement?

A

Important muscles are recruiting at the right time. (post-injury muscles can be sluggish)

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8
Q

What effect does balance have on movement?

A

Be able to keep balance in various positions

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9
Q

What effect do neuromuscular responses have on movement?

A

They need to be working well to enable movement

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10
Q

What effect do kinematic sequencing, timing, coordination have on movement?

A

Enables us to move fluidly and be coordinated when we move

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11
Q

What effect does dissociation have on movement?

A

The ability for joints to be working independently - e.g. being able to move one body part without another moving.

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12
Q

What effect does flexibility have on movement?

A

gives us range within the joint, and also muscle to allow for effective/efficient movement.

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13
Q

What effect does confidence, beliefs, attitude, intention and motivation have on movement?

A

belief that they can get back to do that movement if you think you can you will!

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14
Q

What effect do strength and endurance have on movement?

A

The ability to perform the movement and thus repeat it if necessary.

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15
Q

Why is movement analysis important as a physio?

A

Alerts you to painful structures (e.g observing a limp)

Identifies faulty structures (e.g as a patient goes down into a squat one heel lifts off the ground which can indicate stiffness in the ankle)

reduces stress on the body and possible injury (can prevent future problems - research has shown that improved general strength can help with efficiency)

Improve movement efficiency (

Helps patients function / improve performance

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16
Q

How is biomechanics defined?

A

the study of the structure and fuction of biological systems by the application of (Newtonian) mechanics.

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17
Q

What is kinematics?

A

Description of motion

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18
Q

What is Kinetics

A

Description of motion consideration of force as the cause of motion.

19
Q

What is Newtons law of inertia

A

An object will stay at rest and an object in motion will stay in motion unless acted upon by an outside force.

the reluctance to change what it is doing.

E.G if a football is rolling, it will keep rolling unless something stops it… if a ball is at rest it will stay at rest until a force moves it.

20
Q

2 newtons law of acceleration

A

The acceleration of an objet is directly proportional to the force action on it and inversely proportional to the mass of the object.

As the force acting on the object increases, the acceleration of the object also increases (hitting a hockey ball with hockeystick)

As the mass of the object increases the acceleration decreases.

Sprinter with a large muscle mass - generate more force from their muscles but the need to generate more force to move the mass.

21
Q
  1. Newtons law of action and reaction
A

To every action there is an equal and opposite reaction ;

eg. when walking your body pushes ono the ground as you move and then the ground pushes back through your foot.

22
Q

What is force?

A

An influence that changes the state of rest or motion of a body of object.

Force is a concept
usually the result of an action.

A body’s state of being is either at rest or in motion and can be changed by another body - normally a pulling or pushing action.

23
Q

What is force influenced by?

A

Magnitude
direction
point of application

F = mass x acceleration

24
Q

What is a force system?

A

When there are more than one force occurring or being applied (eg. tug of war)

25
Q

What is 1D (1-Dimensional) Colinear force system?

A

Where the forces are acting in the same plane and along the same line of action. They may pull in the same or opposite directions.

e.g tug of war

26
Q

What is 2D (2-Dimensional) Co-planar force system?

A

Where the forces are acting on the same plane but not the same line of action.

eg - turning a steering wheel… one hand pulls up and the other pulls down but they are moving in a different direction but the same line of plane.

27
Q

What is 3D 3-Dimensional force system?

A

Forces are acting in more than one plane - most common but difficult to analyse.

28
Q

Types of forces:

A

Gravity: attraction of any object to the earth. Acceleration due to gravity can be seen when an object falls to earth.

Ground reaction force (GRF):
Newtons 3rd law - when a foce is applied to the ground this force is reflected back up through the foot.

Centripetal force: where a body or object moving in a straight line will continue to do so until force is applied (Newtons law of inertia).

Frictional: Where there is a resistance when 2 objects move over one another.

Internal/external:

29
Q

Internal forces example

A

Muscle contraction

Ligament tension

30
Q

External forces examples

A

Gravity
Ground force reaction
Wind resistance

31
Q

Forces acting on your body

A

Compression: Push or squeeze (e.g. disc compression in the spine as the day goes on - shorter at the end of the day than upon awakening)

Tension: Pulling on an object
(Body muscles, ligaments and tendons, constantly being put under tension)

Bending: tension and compression ( when one side of an object is compressed and the other side is put on tension.)

Torsion:
Twisting around an axis (more injury-related problems) when a part of the object is fixed and part twists (ankle sprain)

Shear: Moving two directions at once (more injury-related problems) two directions of movement occurring Force can cause something to snap by moving in two directions. (skiing accident)

32
Q

What is work?

A

Linear = Force x distance of displacement

Rotational = Movement (torque) x joint angular displacement

33
Q

Power

A

the rate at which work is performed.

34
Q

How can you increase power?

A

Increase force component - Increase strength (muscle)

Negative effects =
More mass = heavier

Power is nothing without control

35
Q

Levers

A

Rigid bar/rod (usually a bone in the body) that rotates round a fixes point (axis or fulcrum)

36
Q

what is a 1st order lever?

A

RAF
Axis between resistance and force.

e.g atlanto-occipital joint

37
Q

What is a 2nd order lever

A

ALF
Axis, resistance, force

Resistance between axis and force.

Calf - when going up on your toes.

38
Q

What is a 3rd order lever?

A

ARF

Force between the resistance and axis

Eg. Elbow join and bicep (bicep curl) (most common in the body)

39
Q

Lever advantages

A

Mechanical
Increased range of motion

(you can’t have both)

40
Q

What does a 1st class lever help with?

A

Either mechanical advantage or increased range of motion depending on the effort. If arm load is bigger it can have a mechanical advantage.

41
Q

What does a 2nd class lever help with?

A

Always has the load further from the pivot point - therefore you can move a larger load - a bigger mechanical advantage)

42
Q

What does a 3rd class lever help with?

A

Load is further from the pivot than the effort - will increase range but an increased amount of effort is required to get there. (mechanical disadvantage but increase in range)

43
Q

Lever length is important…

A

When prescribing exercising.

Press-up - having knees down reduces the lever.