THROW Pattern PUSH Pattern

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THROW Pattern PUSH Pattern

• proximal segments in front of projectile with
  distal segments behind projectile
• sequential for ? v
• curvilinear path
• mostly wheel-axle

• all segments behind projectile pushing the
  projectile or load
• simultaneous for ? F
• rectilinear path
• mostly lever motions

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Movement Patterns - Related Skills
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Constraints Throw/Push Continuum

• Mass of projectile
• Volume/Size of projectile
• Shape/Profile of projectile
• Target Area for projectile
• Strength/Power of person
• Skill of person

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OPEN Kinetic Chain CLOSED Kinetic Chain

• Throw or Kick
• End Segment Free e.g. hand, foot
• sequential movement of body segments

• Jump or Push or Pull
• End Segment Restrainede.g. foot, hand
• simultaneous movement of body segments

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Throwlike Patterns

• 1. Proximal Parts Move First
• 2. Distal Parts Lag Behind
• 3. Achieve either maximum distance HORZ or
  VERT OR maximum velocity

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Fig J.1 page 338
1. segment A is accelerated which gives L to
entire system segments A, B, and C 2. A
rotates cw while B and C lag behind 3. A is THEN
decelerated by muscle T 4. To conserve L, B
accelerates cw THEN decelerates, C then
accelerates cw
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Transfer L to arm by reducing/stopping L in
shoulders
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? End Point v due to decreasing r

• See FIG. J.1 on page 338 L mk² x ?
• initial k is from axis a to top of segment C
• when segment A decelerates, the k changes to the
  distance from axis b to top of segment C
• when segment B decelerates, the k changes to the
  distance from axis c to top of segment C

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v r ?

• final velocity of hand or foot or implement _at_
  release/impact determines projectile v
• r ? d from the axis of rotation e.g. joint
  and the contact point of release/impact
• see FIG J.12 on page 352 with regard to r

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Kinetic Link Characteristics

• system of linked segments with a fixed base and a
  free open end
• more massive segments _at_ proximal end
• least massive segments _at_ distal end
• initial motion caused by T applied to base
• T gives entire system L L mk² x ? OR
  L I?

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Sequential Motions

• 1. proximal/massive segments move first givingL
  to entire system
• 2. external T decelerates proximal segments
• 3. to conserve L, next segment, which is less
  massive, accelerates with rotation now occurring
  about a new axis and a smaller k
• 4. Each successive segment/link accelerates
  achieving ? ? than previous segment due to both
  m and k getting progressively smaller

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Airborne Reaction Rotation

• See FIG 15.16 on page 514
• VB spiker abducts hip and/or flexes knees to? I
  (I mk²) in lower extremities
• turntable demo

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Lever Motions Wheel-Axle

• Flexion/Extension
• Protraction/Retraction
• Abduction/Adduction

• Medial/Lateral Rotate
• Pronate/Supinate
• Inversion/Eversion

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Wheel-Axle Motions

• muscle T rotates a bone which becomes an axle
• the wheel is the adjacent segment positioned at
  an angle to the axle
• the wheel r (radius) is modified via
  flexion/extension or adduction/abduction
• see FIG J.6 on page 346 and FIG J.12 on page 352

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THROW / PUSH for Speed and Accuracy
FIG J.8 page 349
FIG J.10 page 350
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Enjoy the Break No Class this Friday