Katie Alger April 21, 2011 Breaking Down the Worm.

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Presentation transcript:

Katie Alger April 21, 2011 Breaking Down the Worm

What is the worm? An iconic break-dancing move also known as the “kick-worm” or the caterpillar First invented in the 1920s Seen during the 1970s punk emergence Popularized in the infancy of 80’s hip-hop dance funk

Is it useful? Listed as a “life skill” on eHow.com Recommended for: Parties Bat mitzvahs Sweet 16s Weddings Spring fling

How do I do it? Lie flat on the ground with your palms near your head and your elbows at your sides. Prop your toes up on the floor with your feet close together. Using your toes, pick up your feet, legs and hips in a fluid motion. Follow through with lifting your body as your feet and legs go back down to the floor. Lift up the top half of your body with your hands, palms down. Lift up your head as your body arcs to the top of your torso. Fall back down into the flat on the floor position. Repeat these steps over and over as you move across the room or dance floor.

Demonstration (forwards)

Backwards

Muscles Involved? Arms bear a lot of weight, while lower back and abdominal muscles are used to whip the body through the undulating motion. Recruit fast twitch muscle fibers Generate short bursts of strength (more power) and speed (higher Vmax).

Difference in Motion? To the naked eye (without the aid of a high speed camera), the motion of the forwards and backwards worm look almost the same When performing the worm, the two types feel much different (forward hurts!) Question: Which parts of the body move differently during the two versions?

Tracking the Movement (forwards) Center of mass Hands Feet Knees (below)

Backwards Breakdown Center of mass Knees Feet Hands (below)

Underlying Questions Which part of the body generates the most momentum? Are there large differences in momentum between the two versions of the worm?

Assumptions Weight distribution 50% of body mass supported by center of mass 45% supported by knees 5% by feet Velocities used are correct from LoggerPro

Forwards Momentum Feet Knees Center of mass X velocity = .4559 m/s Y velocity = 2.642 m/s X + Y vectors added = 2.68 m/s p=mv=(.05*52.3)(2.68) = 7.01 kg m/s Knees X velocity = .7847 m/s Y velocity = 1.612 m/s X + Y vectors added = 1.78 m/s p=mv=(.45*52.3)(1.78) = 41.89 kg m/s Center of mass X velocity = .4410 m/s Y velocity = 1.015 m/s X + Y vectors added = 1.092 m/s p=mv=(.50*52.3)(1.092) = 28.55 kg m/s

Backwards Momentum Feet Knees Center of mass X velocity = 1.045 m/s Y velocity = 4.680 m/s X + Y vectors added = 4.78 m/s p=mv=(.05*52.3)(4.78) = 12.49 kg m/s Knees X velocity = .9938 m/s Y velocity = 2.501 m/s X + Y vectors added = 2.688 m/s p=mv=(.45*52.3)(2.688) = 63.26 kg m/s Center of mass X velocity = .8081 m/s Y velocity = 1.801 m/s X + Y vectors added = 1.97 m/s p=mv=(.50*52.3)(1.97) = 51.51 kg m/s

Direct Comparison Forward Momentum Backward Momentum Center of Mass 28.55 kg m/s 51.51 kg m/s Knees 41.89 kg m/s 63.26 kg m/s Feet 7.01 kg m/s 12.49 kg m/s Movement of the knees generated the most momentum in both cases. Backwards movement creates more momentum than forwards. Why?

Why are the values so different? Center of mass, knees, and feet lift higher when going backwards Greater change in Y value  faster velocity  more momentum

Why are the values so different? Forward motion takes longer per undulation (1.4 s/cycle versus 1 s/cycle) Longer cycle time  shorter change in X over same time period  slower velocity  less momentum

Future Directions Does backwards motion really create more momentum? Increase sample size Is the impact on trunk, knees, and feet much different between the two types? Use force plates. Which version of the worm would be a better exercise? Break down energy to see calories burned.

Questions?