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PRINCIPLES OF BIOMECHANICS

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PRINCIPLES OF BIOMECHANICS BUILDING BLOCKS OF EXERCISE SEVEN PRINCIPLES Grouped into four(4) categories Category 1 = Stability Category 2 = Maximum Effort Category 3 ... – PowerPoint PPT presentation

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Title: PRINCIPLES OF BIOMECHANICS


1
PRINCIPLES OF BIOMECHANICS
  • BUILDING BLOCKS OF EXERCISE

2
SEVEN PRINCIPLES
  • Grouped into four(4) categories
  • Category 1 Stability
  • Category 2 Maximum Effort
  • Category 3 Linear Motion
  • Category 4 Angular Motion
  • Pages 231 234 in textbook

3
Stability - Principle 1
  • Proper stability balance are essential to
    efficient movement.
  • See notes on stability from earlier in unit.

4
Max Effort - Principle 2
  • Production of maximum force requires the use of
    all possible joint movements that contribute to
    the tasks objective.
  • With more joints coming into play, the more
    muscles there will be to contract leading to
    greater force being exerted.

5
Principle 2
  • Example Throwing a ball
  • Use as many body joints as possible

6
Max Effort - Principle 3
  • Production of maximum velocity requires the use
    of joints/muscles in order from largest to
    smallest.

7
Principle 3
  • Example Use legs to shoot in basketball
  • Bend from legs to generate more force

8
Linear Motion Principle 4
  • The greater the applied impulse or force, the
    greater the increase in velocity.
  • The harder you hit an object, the farther it will
    travel.

9
Principle 4
  • Principle of Impulse crouch before you take off
    to jump.
  • Reverse Impulse absorbing forces when catching
    an object or landing after a jump. ( in order to
    lessen the load on joints and disperse the large
    forces at work)

10
Linear Motion Principle 5
  • Movement usually occurs in the direction
    opposite that of the applied force.
  • Examples Resistance of water in swimming,
    pushing off floor before jumping, etc.
  • Related to Newtons 3rd Law (Reaction)

11
Angular Motion -Principle 6
  • Angular motion is produced by the application of
    a force acting at some distance from an axis.

12
Angular motion
13
Principle 6
  • Angular velocity increases closer the object is
    to the axis of rotation.
  • Examples figure skating spinning, diver
    spinning, throwing a curve ball.

14
Angular Motion -Principle 7
  • Angular momentum is constant when an athlete or
    object is free in the air (or airborne).

15
Applying PrinciplesCase 1
  • You are coaching a peewee football team and you
    notice that one of your 50kg linemen is getting
    knocked down very easily and often. As a result,
    your 9-year old all-star quarterback has suffered
    his 5th concussion and is forced to eat all of
    his meals through a straw.

16
Case 1
  • Principle 1 Work on stability of linemen.
  • Principle 3 Large to small muscles when
    pushing off opponent.
  • Principle 4 Hit opponent harder to protect
    quarterback.
  • Anything else?

17
Applying PrinciplesCase 2
  • When Silken Lauman was a young rower she pulled
    the oars with her arms and then pushed with her
    legs, causing her boat to not travel as fast as
    she would like. Somehow she became one of the
    best rowers in the world.

18
Case 2
  • Principle 3 Largest to smallest muscles.
    Generate force from legs and then arms.
  • Principle 5 Resistance of oars in watermore
    efficient strokes.
  • Anything else?

19
Applying PrinciplesCase 3
  • Ben Johnson could run the 100m in 10 seconds.
    After pumping his body full of steroids, he cut
    his time to a world record time of 9.79 seconds
    in 1988.

20
Case 3
  • Principle 4 Greater applied force, greater the
    reaction. Push off ground harder with steroids.
  • Principle 5 Movement occurs in opposite
    direction of applied force. Push off starting
    blocks harder with steroids.
  • Anything else?
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