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MOVEMENT ANALYSIS:, Captura de Pantalla 2022-05-05 a la(s) 12.15.00 p. m.,…
MOVEMENT ANALYSIS:
Chapter 7: lever systems in sport
and physical activity
Lever systems in the body
The levers in the human body are the bones, which make it easier to move something heavy, or to move something quickly.
Main components:
the load
the fulcrum
the effort
the lever.
representation : load (object moved) effort (muscular force), fulcrum (joints) lever (skeleton)
First class levers
Are those in which the lever system works as follows: the fulcrum lies between the effort and the load.
Example: The elbow is the fulcrum, the stress is provided by the triceps due to its insertion point at the elbow and the load is what is thrown.
(if you throw a ball, the ball is the load, the elbow is the fulcrum and the effort would be represented by the triceps).
Second class levers
Are those in which the load is between the effort and the fulcrum.
Example: bottle opener (the fulcrum would be the bottle, the level the bottle opener, the effort the hand that lifts the bottle opener and the load is the force exerted.)
Third class levers
one in which the fulcrum is at one end of the beam, in the center the effort and at the other end the load.
Example:A broom is used as one of this method since you rest your hand on top of it (fulcrum) with the other hand you apply the force (effort) and the load is what is created under the broom when using it this way.
MOST COMMON IN BODY
IMPORTANT: Lever systems in which a force greater than the load to be moved must be applied are said to provide a mechanical disadvantage. move are said to provide a mechanical disadvantage. However, these levers are useful for sport, as they allow us to move the load a great distance, with a large range of motion.
Chapter 8: Planes and axes
of movement
Planes:
Saggitar plane:perpendicular to the ground and at right angles to the frontal planes, which divide the body into halves.
Frontal plane: A vertical plane running from side to side; divides the body or any of its parts into anterior and posterior portions.
Transverse plane: A horizontal plane; divides the body or any of its parts into upper and lower parts.
Axes:
Frontal axis: - horizontal line running from left to right through the body
Vertical axis: - vertical line going through the body from top to bottom
Saggital axis: horizontal line running from front to rear through the body
IN A PLANE AROUND AN AXIS, ALL MOVEMENTS TAKE PLACE.
