Back handspring Back 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 ID: 605599
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Slide1
Biomechanical analysis:Back handspringBack Tuck
Amanda
Heringer
Tara Gentry
Christy JefferySlide2
DefinedBack 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
.Slide3
Motion Analysis
Slow Motion Back handspring
Slow Motion Back tuck
Full Speed Round-off Back handspring TuckSlide4
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. Slide5
Anatomy The adductor muscles allow for the legs to squeeze together during the upside down phase of movement.Slide6
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. Slide7
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. Slide8
Back Handspring Phases
Phases of a Back Handspring
1. Starting Position/Set
Phase
2. Pushing Off Phase
3. Pushing Back Phase
4. Arching of the Back Phase
5.
Handstand
/Touchdown Phase
6-7 Snap Phase
8-9 LandingSlide9
Standing Back Tuck Phases
1
2
3
4 5
6
Phases of a Standing back tuck
1. Starting
Position/ Set Phase
2.
Build up/Pushing off
3. Lift off
4. Initial entry
5. Tuck
6. Landing
Slide10
Frictional forceSlide11
EnergyWork = KE + PESlide12
DisplacementSlide13
Center of gravity
Phase 1
Phase 2
Phase 3
Phase 4
Phase 1 – Center of gravity is moved to behind the body
Phase 2 – Center of gravity is thrown back into an arch
Phase 3 – Angular momentum allows center of gravity to pass over head/hands
Phase 4 – Center of gravity is returned to starting positionSlide14
VelocitySlide15
Newton’s Second Law in ActionFull Twist:
Frictional force creating torque along the longitudinal axis.Slide16
Conservation of Angular momentumStanding vs. Running Approach
Round off
H = I
= mk
2
Slide17
Moment of Inertia Slide18
Manipulating the Moment ArmWhich position reduces the moment of inertia?Slide19
Biomechanics Gone WrongSlide20
Questions?