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Exercise Science Performance Task

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by

rebecca chen

on 17 January 2014

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Transcript of Exercise Science Performance Task

Biomechanics of a Badminton Forehand Overhead Clear (Right Handed)
By: Rebecca Chen
What Does it Look Like?
Newton's Laws
The Law of Acceleration
The greater the acceleration of the swing, the greater the force applied to the bird on contact
Force/acceleration can be controlled
Racket Strings
Tension usually between 18-30 lbs

Thicker strings= more control
Thinner strings= more power
Low tension strings= greater speed/more power
High tension strings= more control

Pros- 26 lbs + vs. Amateurs- 23-26 lbs
Racket Types
Racket Head Speed x Racket Head Weight = Power
Lighter Weight Racket
Usually used for playing doubles (more control)
Racket weight: 93-98 g (includes grip and string)
Balance point: 270-275 mm (measured from the handle to the shaft)
Headlight feeling
Heavier Weight Racket
Usually used for playing singles (more power)
Racket weight: 96-100 g (includes grip and string)
Balance point: 280-290 mm (head heavy)
Racket Stiffness
Less Stiff (flexible shaft): More control & easier to maneuver
More Stiff (less flexible shaft): Suited for more powerful players
Racket Head Shape
Isometric construction frame
Large sweet spot
Transmits less shock
More prone to vibration (longer strings)
More powerful
Can add more tension to strings than conventional racket (Oval Head)
Grip
Different sizes of grips for different hand sizes
Different grips are made of different materials (eg. Regular, Strong, Dry, Moist, Towel, Mesh, Tacky, etc.)
Comfort/Reduce sweat/Control
The Law of Reaction
Pushing on the floor, floor pushes back (gives power for the shot-kinetic linking)
Bird hits the strings of the racket & the strings push back on the bird, allowing the bird to move in the opposite direction
Rotational Motion
Rotation of the trunk for maximum power
Force doesn't act through centre of mass
Off centre (more force is put onto the back foot than the front)
Levers
Class I Lever
Resistance
Fulcrum
Load is the bird (not shown in photo)
If more force is put into the swing, then the bird (load) will move farther
Arm extension (longer lever) allows for more power
Major Muscles
All muscles in the body work together (kinetic linking)
Muscles of the abdomen
Muscles of the rotator cuff
Pectoralis major, Latissimus dorsi
Muscles that position the scapula
Deltoid, Coracobrachialis, Teres major
Elbow flexors & extensors
Muscles in the forearm (supination & pronation)
Muscles of the hand/wrist
Hip Flexors & extensors
Quadriceps & Hamstrings
Muscles of the leg & foot
Major Joints
Ball & Socket (Hip)
Hinge (Elbow)
Gliding (Foot)
Ellipsoid (Wrist)
Shoulder
Knee
Facet (Spine)
Potential Injuries
Ankle Sprain
Meniscus Tear- caused by sudden twisting movement of knee
Muscle Strains- Hamstring, Gastrocnemius, etc.
Tennis Elbow- Chronic overuse injury caused by over tension of strings, change of grip size, poor recovery
Patellar Tendonitis (Jumper's Knee)- caused by repetitive jumping & landing on hard surface with poor footwear
Wrist sprain
Rotator cuff tear
Purpose of the Skill
Used to hit the bird deep to the back of the court
Gives you more time to prepare for next shot (allows you to return to base- centre of court)
Sets you up for the next shot (forces other player to the back of the court & creates space at the front)
Phase 1- Preliminary Movements
Lower centre of mass = more stability
Grip
Hold racket as if shaking hands
V shape between thumb and index finger
V is pointed toward the opposite shoulder
Phase 2- Backswing

Weight is shifted onto the rear foot (balls of the feet)
Left arm out for balance & hand points at the bird to improve timing of shot
Right arm is back (prepare for swing)
(Elbow is bent and wrist is locked)
Body is turned perpendicular to the net (non racket shoulder faces the net)
Phase 3- Force Producing Movements
Left leg is forward (Right leg is back)
Body turns toward the net during swing
Right arm (racket arm) swings forward
Weight shifts to front foot (left foot)
Principles Applied
Maximum effort- all parts of the body are used during the swing (arms up & swinging, body extends, legs move & extend)
Maximum Velocity- Parts of the body are used from largest (body) to smallest (hands & wrist)
Impulse- F=ma (speed of the racket)- the greater the force applied, the greater the impulse
Phase 4- Critical Instant
When the racket hits the bird
Bird is hit with the racket face slightly tilted backward
Contact is made at the highest point possible (extend arm) and slightly in front of the right shoulder (not directly above)
Wrist unlocks with a whip like action as the bird is hit
Motion is similar to throwing a ball
Phase 5- Follow Through
Racket follows through- ends up on the left side of the body
Right leg forward (weight shifted to front foot)
Move back to base (prepare for next shot)
Principles Applied
Angular Motion (Torque)- Arm is brought closer to the body during the follow through (from right side to left side), which produces more force & a higher velocity results
Pronation of the forearm & flick of the wrist generates racket speed
Angular Momentum- bird is hit with a slight angle (racket face is tilted back slightly) which causes the bird's trajectory to be an arc
While the bird is in the air, the momentum is constant and the direction of motion doesn't change
Rookie vs. Pro
Rookie Errors
Doesn't turn body when getting ready to swing & hit
Elbow drops too low when swinging (means you need to move the arm farther during the swing--> less acceleration & force)
Doesn't extend arm all the way when hitting (limits how fast & how far the bird will travel)
Should make contact with the bird higher in the air
Right foot should be in front after the swing (follow through)
"Shuffle"
Types of Birds
Feather Bird
Made of 16 feathers (goose/duck)
Most professional badminton players use them
Tend to be quicker than the plastic ones
More consistent flight
Gets damaged easily- affects game play
Weigh more than plastic bird
Plastic Bird
Very durable
Used more by recreational badminton players & beginners
Less consistent speed & flight
Need to be aware of quality (Where you're buying it from)
Olympic Disqualification
In the 2012 Olympics, 8 players were disqualified
Disqualified for throwing their games (deliberately trying to lose)
Tried to manipulate their place in the round robin standings
Attempted to choose opponents in knockout phase of tournament
Works Cited
"Badminton - Shuttlecocks." Teach PE. N.p., n.d. Web. 14 Jan. 2014.
<http:// www.teachpe.com/badminton/shuttlecocks.php>.
Fitz-Gerald, Sean. "Eight badminton players disqualified from Olympics for
match-fixing." National Post. N.p., 1 Aug. 2012. Web. 14 Jan. 2014. <http://sports.nationalpost.com/2012/08/01/eight-badminton-players-disqualified-from-olympics-reports/>.
"How to choose a badminton racket." X Badminton Tricks. N.p., n.d. Web. 14
Jan. 2014. <http://www.xbadmintontricks.com/2010/11/how-to-choose-a-badminton-racket/>.
"The Contribution of Technology on Badminton Rackets." Prospeed. N.p., n.d.
Web. 14 Jan. 2014. <http://www.prospeed.com.my
choosing_racquets.html>.
Eyes looking forward
Leaning forward slightly
Knees bent
Weight on the balls of the feet
Split Step
Full transcript