PE 202 - Chap. 3 Fundamentals of Applied Kinesiology

  1. Agonist
    is a muscle that causes a desired motion. (prime mover)
  2. Antagonists
    muscles that have the potential to oppose the action of the agonist muscle.
  3. Synergist muscles
    assist the agonist in causing a desired action.
  4. Co-contraction
    Agonist and antagonist muscles contract together and a joint must be stabilized.
  5. Concentric contraction
    • Muscle acts as the motive force and shortens
    • as it creates tension.

    Motion is created by the muscle contraction.
  6. Eccentric contraction
    Muscle resists force and lengthens as it creates tension.

    • Motion is controlled (slowed) by the muscle contraction.
  7. Center of gravity (COG)
    • body’s mass is balanced on either side in all planes
    • (frontal, sagittal, and transverse)

    A point where gravity is enacting a constant downward pull.
  8. Line of Gravity
    Gravity acts on the body in a straight line through its COG toward the center of the earth.
  9. Base of support (BOS).
    • is the area beneath the body that is encompassed when one continuous line connects all points of
    • the body that are in contact with the ground.
  10. Law of inertia
    • A body at rest will stay at rest and a body in motion will stay in motion
    • (with the same direction and velocity)
    • unless acted upon by an external force
  11. Law of acceleration
    Force (F) acting on a body in a givendirection is equal to the body’s mass (m) multiplied by its acceleration (a).
  12. Law of reaction
    Every applied force is accompanied by an equal and opposite reaction.
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PE 202 - Chap. 3 Fundamentals of Applied Kinesiology
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