PE 2800 Lecture Notes - Lecture 15: Knuckleball

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Published on 15 May 2017
Core Concepts of Kinesiology
Article by Jackie L. Hudson
Range of Motion
o distance that a body, body part, or an object moves during a time interval of interest
o ROM  force
o Ex: wt. lifter ROM when force (fatigue)
Speed of Motion
o speed  force
o Ex: walk jog run ( speed and force needed)
o ROM + time
Number of Segments
o Amount of ROM
o Minimal ROM = inactive
o Mod-max ROM = active
o Ex: archerymost are stationary
o Ex: javelinmost are mobile
o Novicethrowing—freeze out certai segets, skill improves more segments used
o Mastermay use too many segments (strong mover on a sub-max movement)
Nature of Segments
o Forward, backward, R/L, twisting
o Twisting generates the greatest speed, requires the most skill
o To change amount of long-axis motion, change nature by change speed of segment
o Degree of stability or mobility
o Greatest stability is achieved by maintaining the line of gravity near the middle of the
o Ex: golfneed a degree of mobility during swing, but also more stability
o mobility  BOS
o accuracy  stability
o Ex: speed of bicycle  stability
o Ex: thrower ROM  BOS
o Body action are times and sequenced
o Jerky or sporadic uncoordinated
o Smooth or graceful coordinated
o Skilled movers, move body segments in
o unison when activity is heavy
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