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Muscle Contractions

Muscle Contractions. Homework Review. Do Now. Review. All muscle must be stimulated In between axon and muscle is a neuromuscular junction Motor axon breaks into several branches called axon terminals Each branch forms a neuromuscular junction with a single muscle cell

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Muscle Contractions

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  1. Muscle Contractions

  2. Homework Review Do Now

  3. Review

  4. All muscle must be stimulated • In between axon and muscle is a neuromuscular junction • Motor axon breaks into several branches called axon terminals • Each branch forms a neuromuscular junction with a single muscle cell • 1 neuron stimulates many muscle fibers • Motor unit – neuron and all the muscles it stimulates Review

  5. Neuron and muscle fibers DO NOT touch • Separated by small, fluid filled gap called the synaptic cleft • Acetylcholine (neurontransmitter) carries the impulse across the gap and delivers the message • If enough acetylcholine is released, the permeability of the receiver changes, allowing for sodium to enter the surface • Results in possible muscle contraction Review

  6. 3 Different types of muscle contraction that are used in a variety of situations • Isometric • Eccentric • Concentric Types of Muscle Contraction

  7. Isometrics are when there is a muscle contraction, but not change in muscle length • Great strengthening tool, used when pain is felt in a ROM • Example: Planks, Pushing a wall, wall squat • Can exert considerable force on an immovable object, even though not movement occurs Isometrics

  8. Most widely known form of muscle contraction • During contraction, muscle length shortens to overcome resistance • Example: Bicep curl Concentric

  9. Commonly underutilized muscle strengthening technique • Resistance is greater than the muscular force being produced • Leads to a lengthening of the muscle while contracting, instead of a shortening • Not to say that the weight has to be too heavy to lift Eccentric

  10. There are a countless number of ways to improve in strength training • Functional Exercises • Isometrics • Progressive Resistance Exercise • Isokinetics • Plyometrics Resistance Training Techniques

  11. What does functional mean to you? • Functional has to do with “sport specific” exercises • Ladder drills • LAX stick • Football • Basketball • “Kinetic Chain” Functional Exercises

  12. Students are going to work in groups • Due Monday, each group must determine a concentric, eccentric and isometric exercise for their muscle group given. Students will pick muscle group out of a hat Homework

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