Transcript Biomechanics of Jumping and Landing

Biomechanics of
Jumping
Biomechanics of Jumping
Applications
Sports that Focus on Jumping
Sports that Depend on Jumping
Maximimizing Vertical Height
Maximimizing Horizontal Displacement
Landing
Biomechanics of Jumping
The Body as a Projectile
Center of Gravity Follows a Parabola
Acted Upon by Gravity
Body May Move Around the C of G
Rarely Influenced by air resistance
Biomechanics of Jumping
Factors Determining Path of C of G
Velocity at Take-off
Angle of Trajectory at Take-off
Height of C of G at Take-off
Aerodynamic factors
Biomechanics of Jumping
Maximizing Vertical Height
Velocity at Take-off …….maximize, but
Angle of Trajectory at Take-off………..90 degrees, but
Height of C of G at Take-off…………as high as possible, but
Key – Velocity compromised
to optimize take-of angle
Key – Adjust body position in
flight to optimize relationship
to C of G
Biomechanics of Jumping
Maximizing Horizontal Displacement
Velocity at Take-off …….maximize, but
Angle of Trajectory at Take-off………..90 degrees, but
Height of C of G at Take-off…………as high as
possible, but
Key – Velocity optimized and
take-of angle compromised
Key – Role of the free arm
and free leg
Biomechanics of Jumping
Aerodynamics
The Extent of the Influence is a Function of the
Relative Velocity
Examples –
Long Jumper and Headwind – Drag
Ski Jump and Headwind - Lift
Biomechanics of Jumping
Landing
Basic Objective – Change the
Body’s Momentum to Zero
Impulse = Force x Time
As Time Increase Force
Decreases
Factors –
Joint Motions
Landing Surface Compliance
Other ………