BIOMECHANICAL ANALYSIS:

BACK HANDSPRINGBACK TUCK

Amanda Heringer

Tara Gentry

Christy Jeffery

DEFINED Back handspring: an acrobatic move in which

a person executes a complete revolution of the body by lunging headfirst from an upright position into a handstand and then pushing off (i.e., "springing") from the floor with the hands so as to leap back to an upright position.

Back tuck: Gymnastics flips are acrobatic moves in which a person executes a complete rotation of the body while in mid air, with hips passing over the head, without hands touching the floor. TUCK: legs together, with knees fully bent and drawn

to the chest.

MOTION ANALYSIS

Slow Motion Back handspring

Slow Motion Back tuck

Full Speed Round-off Back handspring Tuck

ANATOMY During take off

and landing the quadriceps and gluteal muscles create the most power.

Gluteus Maximus is the main pushing muscle of the buttocks.

ANATOMY The adductor

muscles allow for the legs to squeeze together during the upside down phase of movement.

ANATOMY The abdominals are

used in essentially every move of a back handspring and back tuck.

Furthermore, the abdominals contract to pull the legs and pelvis over the top.

ANATOMY The muscles of the

arms, chest, and back work together to assist and oppose each other.

In a backhand spring they all aid to pass through the handstand position and push off the floor.

BACK HANDSPRING PHASES Phases of a Back Handspring 1. Starting Position/Set Phase 2. Pushing Off Phase3. Pushing Back Phase 4. Arching of the Back Phase5. Handstand/Touchdown Phase6-7 Snap Phase8-9 Landing

STANDING BACK TUCK PHASES

1 2 3 4 5 6

Phases of a Standing back tuck1. Starting Position/ Set Phase2. Build up/Pushing off3. Lift off4. Initial entry5. Tuck6. Landing

FRICTIONAL FORCE

ENERGYWork = KE + PE

DISPLACEMENT rrarclength

θ

CENTER OF GRAVITY

Phase 1 Phase 2 Phase 3 Phase 4

Phase 1 – Center of gravity is moved to behind the bodyPhase 2 – Center of gravity is thrown back into an archPhase 3 – Angular momentum allows center of gravity to pass over head/handsPhase 4 – Center of gravity is returned to starting position

VELOCITYt

NEWTON’S SECOND LAW IN ACTION

Full Twist:

Frictional force creating torque along the longitudinal axis.

I

T

CONSERVATION OF ANGULAR MOMENTUM Standing vs. Running Approach Round off H = I = mk2

MOMENT OF INERTIA

MANIPULATING THE MOMENT ARM Which position reduces the moment of

inertia?

BIOMECHANICS GONE WRONG

QUESTIONS?