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Movement Analysis of the Back handspring. December 8, 2005. Catie O’Reilly Kurstin Meenan Andrea Maillett Bob Kniffen Lisa Stuart. Background and Goals. Gymnastics Introduced to the United States in 1830’s First large scale competition was held in 1896 in Athens, Greece

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Movement analysis of the back handspring l.jpg

Movement Analysis of the Back handspring

December 8, 2005

Catie O’Reilly

Kurstin Meenan

Andrea Maillett

Bob Kniffen

Lisa Stuart


Background and goals l.jpg
Background and Goals

  • Gymnastics

    • Introduced to the United States in 1830’s

    • First large scale competition was held in 1896 in Athens, Greece

    • There are many levels of gymnastics activity including recreational, non-elite competitive (levels 1-7), high level competitive (levels 8-10) and elite.

  • The Back handspring

    • Part of progression to more difficult skills

    • Performed numerous times in training and competition

    • From a stand, a backward jump in an arched position to the hands (passing through a handstand) followed by a quick snap-down of the legs, finishing in a standing position

    • Goals

      • Perform skill in controlled and graceful manner

      • Perform skill according to standards set by the sport of gymnastics (body alignment etc)


Phase 1 sit and swing l.jpg
Phase 1 – “sit and swing”

  • Most important part of the back handspring

  • Stand with arms above head

  • Bend at hip and knee joints to lower buttocks down and back (shifts the center of gravity)

    • Knees should not bend past 90o

  • While bending, arms swing down and then up overhead in a continuous motion

  • Lean backward and push forcefully with legs – projecting the gymnast upwards and backwards


Muscles and joints of phase 1 l.jpg

“Sit”

Muscle

Eccentric

Quadriceps

Hamstrings

Gastrocnemius

Gluteus Maximus

Concentric

Rear deltoids

Stabilization

Abdominal muscles

Joint Movements

Flexion of hips, knees, ankles

Extension of shoulders

“Swing”

Muscles

Concentric

Quadriceps

Hamstrings

Gastrocnemius

Anterior Deltoids

Gluteus Maximus

Trapezius

Joint Movements

Extension of hips, knees, ankles, back

Shoulder flexion

Muscles and Joints of Phase 1


Phase 2 passing through the handstand position l.jpg
Phase 2 – passing through the handstand position

  • Arch back and reach for the floor

    • Body is still very tight

  • Hands touch floor

    • Large compressive forces at wrist and hand

    • Elbows flex slightly to absorb shock (compression forces are an average of 2.37 times the body weight)

  • Angular momentum created in phase 1 keeps the body rotating backwards


Muscles and joints of phase 2 l.jpg

Eccentric

Triceps

Wrist extensors

Concentric

Gluteus maximus

Erector spinae group

Deltoids

Trapezius

Quadriceps

Stabilization

Biceps

Abdominal muscles

Vertebrae extend

Shoulders keep extending

Hips, knees and ankles remain extended

Muscles and Joints of Phase 2

Muscles

Joint movements


Phase 3 push off and snap down l.jpg
Phase 3 – Push off and snap down

  • Angular momentum generated during phase 1 allows passage through handstand position

  • Hands press on floor (push off)

    • Helps the body maintain adequate angular momentum to continue the movement

  • Flight path of the body was determined by the velocity and height of the center of gravity at the time of takeoff (Phase 1)


Muscles and joints of phase 3 l.jpg

Concentric

Wrist extensors

Triceps

Latissimus dorsi

Trapezius

Deltoids

Levator scapula

Hip Flexors

Stabilization

Abdominal muscles

Erector spinae group

Extension

Wrists

Elbows

Flexion

Hips

Muscles and Joints of Phase 3

Muscles

Joint movements


Phase 4 landing l.jpg
Phase 4 –Landing

  • Feet touch floor, head and torso come up

  • Joint flexion

    • Hip (32o), knee (22.4o), ankle (-0.5o)

  • Eccentric forces during landing provide a rotating effect in the opposite direction of BHS movement

  • Angular momentum and linear translation are decreased to zero


Muscles and joints of phase 4 l.jpg

Eccentric

Quadriceps

Hamstrings

Gastrocnemius

Gluteals

Stabilization

Core muscles

Flexion

Hip

Knee

Ankle

Muscles and Joints of Phase 4

Muscles

Joint movements


Center of gravity l.jpg
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 position


Angular momentum l.jpg
Angular Momentum

  • Center of gravity is behind the body during the sit and swing (Phase 1)

  • An explosive push at this point generates the angular momentum needed to project the gymnast upwards and backwards

  • Angular momentum generated during phase 1 is enough to allow the gymnast to pass through the handstand position

  • A push with the arms and shoulders while passing through the handstand position generates slightly more angular momentum to make the landing sharp

  • Angular momentum is returned to zero during the landing (when feet hit the floor)

  • The landing is controlled by flexing at the knees, hips and ankles – this slows down the body and dissipates the energy

Phase 1

Phase 2

Phase 3

Phase 4


Mass moment of inertia l.jpg
Mass Moment of Inertia

  • Defined as the resistance to change in angular velocity

  • How this concept applies to the back handspring

    • Not enough power generated during phase 1 of the exercise

    • Cannot complete exercise in the desired extended position

    • Bend knees to decrease moment arm

Moment arm


Limitations l.jpg
Limitations

  • Flexibility

    • Back, shoulder, hips

  • Strength

    • Ability to generate enough angular momentum

    • Ability to support bodyweight on hands

  • Balance

  • Ability to get past mental fear


Specific exercises l.jpg
Specific exercises

  • Handstand

    • With snap down

  • Squat jumps

  • Core strengthening

  • Pushups

  • Bridge

  • Shoulder stretches

  • General stretching


Common injuries l.jpg
Common Injuries

  • Floor exercises are the most common cause of injury, due to the large number of bends, twists, and landings required in those routines

  • The ankle and foot are the most common site of injury in both males and females.

  • Injuries also occur to the lower back, knee and wrist/hand.

  • Muscle pulls (strains)

  • Stress fractures

  • Tendonitis

  • Lumbar spine injuries are common in gymnastics because of the repetitive hyperextension and excessive training



Video cont l.jpg
Video (cont…)


References l.jpg
References

  • http://www.ausport.gov.au/fulltext/2000/vic/gymnastics.asp

  • http://www.safeusa.org/sports/gymnasti.htm

  • http://www.medscape.com/viewarticle/408524_5

  • http://www.coachesinfo.com/category/gymnastics/65#3

  • Tonry, Don; Sports Illustrated Women’s Gymnastic, Harper &Row, publishers, New York, 1980

  • Koh TJ, Grabiner MD, Weiker GG. Technique and ground reaction forces in the back handspring.American Journal of Sports Medicine. 1992 Jan-Feb;20(1):61-6.

  • Hay, James G; The Biomechanics of Sports Techniques. Benjamin Cummings; 1993.

  • Sands, Bill et al. Scientific Aspects of Women’s Gymnastics, S. Karger Publishers, 2004


Questions for final exam l.jpg
Questions for final exam

  • During phase 1 of a back handspring (“sit and swing”) what begins the backward rotation of the body

    • Keeping the head lifted

    • Leaning forward

    • Transfer of the center of gravity behind the body

    • A running start

    • Bending your legs past 90o

  •  2. During phase 1 of the back handspring you extend which of the following

    • ankle

    • hip

    • knee

    • All of the above

  • When passing through the handstand position of a back handspring elbows should be completely straight to absorb shock

    • True

    • False

  • What’s the most important part of a back handspring

    • Arching the back

    • Snapping the legs down

    • Take off from the floor

    • Ability to hold a handstand

    • None of the above

  • If a gymnast doesn’t have enough force during the takeoff phase of a back handspring, which of the following would decrease the moment of inertia allowing them to complete the exercise

    • Bending the elbows

    • Bending legs

    • Straddling legs

    • Keeping head forward


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