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Competitive Jump Rope

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Jen Evans

on 26 October 2012

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Transcript of Competitive Jump Rope

Biomechanics of the Triple Under Jen Evans Competitive Jump Rope Importance of the Triple Under Technique Biomechanical Concept of Dynamic Equilibrium Biomechanical Concept of Center of Gravity Biomechanical
Concept of Torque Errors of the Ankle Joint -competition event
-repetitive force loading
-restricted for children
-foundation of many tricks -not starting in anatomical position
-a few regular jumps and double unders beforehand Torque is the rotary effect of a force, or the angular equivalent of linear force Dynamic Equilibrium is the concept that indicates a balance between applied forces and inertial forces for a body in motion, which means that all acting forces result in equal and oppositely directed inertial forces (Hall, 2012). Center of gravity is the point around which the mass and weight of a body are balanced, no matter how the body is positioned.

Center of gravity may also be called the center of mass and mass centroid.

This implies that all torques (not the weights) on the opposite sides of the center of gravity are equal (Hall, 2012). Landing flat-footed and landing "heavily" are two common errors. -growing in popularity
-almost no research
-cross-training exercise for
other sports (Lee, 2003) Biomechanics -technique spread by word of mouth (Dobrolowski, 2011)
-possible reduction of injury
-trainers and coaches need to know proper technique What is the proper biomechanical technique for a triple under (rope passes under body three times before hitting the ground again)? Upper Body Lower Body -flexion (to extension) during take-off
-knees and hips
-ankles in dorsiflexion (to plantar flexion)
-equal weight on both feet
-mid-air is somewhat personal choice
-flex hips or knees
-proper landing technique
-balls of feet
-flexion of joints (Cronin, Bessel,
& Finn, 2008) -shoulders have ballistic motion (recreational)
-wrists have angular movement (3 full rotations)
-elbows start extended and then flex
-(Duzgun, Baltaci, Colakoglu, Tunay, & Ozer, 2010)
-shoulders stabilize for competitive jumpers Torque is the force multiplied by the perpendicular distance from the force’s line of action. The greater the torque at the axis of rotation, the more likely it will be that rotation will occur (Hall, 2012). Center of Gravity = ([Mass of Arms x Center of Mass Position] + [Mass of Legs x Center of Mass Position] + ...etc.)/ Total Mass Young jumpers typically do not distribute the force over time during landing J (Impulse)=Force x Time "When a vertical jump is executed, the larger the impulse generated against the floor, the greater the jumper's takeoff velocity and the higher the resulting jump." --Hall, 2012 Errors of the Knee Joint -continuous flexion of the knee -more force on knee during landing -center of gravity changes (fall backward) Possible Improvements Ankle -learn the proper technique -rolling of the foot from ball to heel -practice without the rope Knee -land more upright -straighten legs sooner -may be due to limiting factor of the arms Conclusion What is the proper biomechanical technique for a triple under (rope passes under body three times before hitting the ground again)? Three biomechanical concepts are: -Torque
-Dynamic Equilibrium
-Center of Gravity Works Cited

Cronin, J. B., Bressel, E., & Finn, L. (2008). Augmented Feedback Reduces Ground Reaction Forces in the Landing Phase of the Volleyball Spike Jump. Journal Of Sport Rehabilitation, 17(2), 148-159.

Dobrolowski, S. (2011, September 2). Applied physiology of singles rope skipping. Unpublished typescript, University of British Columbia, Vancouver, Canada.

Duzgun, I., Baltaci, G., Colakoglu, F., Tunay, V., & Ozer, D. (2010). The Effects of Jump-Rope Training on Shoulder Isokinetic Strength in Adolescent Volleyball Players. Journal Of Sport Rehabilitation, 19(2), 184-199.

Hall, S. (2012). Basic biomechanics. New York City, NY: McGraw Hill.

Lee, B. (2003). Jump rope training. Champagne, IL: Human Kinetics. Thanks for your time!
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