PPE320_Week5_Muscular_Strength_Training[1] - Resistance...

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Arizona State University Resistance Training PPE 320 – Pediatric Exercise Physiology Week 4 Spring 2016
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Arizona State University Learning Objectives Understand the twitch response of a muscle contraction. Understand how muscle length and joint angle affect force production. Compare and contrast various different muscle actions. Describe the potential health-related benefits of resistance training. Know the basic characteristics of a resistance training program for athletes.
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Arizona State University NASPE Objectives D4. Identify neuromuscular adaptations to resistance training in adults. D5. Apply the basic training principles with consideration to safety and proper supervision to enhance muscular fitness in adults. Understand how different training load, repetitions, sets, and rest intervals yield enhanced muscular performance relative to muscular strength, endurance, and power. Display competency in utilizing a variety of resistance equipment (weights, resistance bands, stability balls, body weight) to strengthen the major muscle groups.
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Arizona State University Properties of Muscle Tissue Excitability Can be electrically excited (end plate potential) Conductivity Can conduct an electrical signal (action potential) Contractility Can shorten and produce force
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Arizona State University Phases of a Muscle Twitch
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Arizona State University Summation of Twitches and Tetanus Summation of twitches: A larger twitch occurs when two stimuli occur very close together Additive tension from more twitches Can increase force production Tetanus: Fusion of individual muscle responses (action potentials) Occurs when muscle is stimulated too frequently and muscle twitch becomes prolonged
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Arizona State University Muscle Twitch Responses— Incomplete (A, B, C, and D) and Complete (E) Tetanus
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Arizona State University Temperature and Muscle Contraction Heating a muscle: More rapid muscle contraction and relaxation Faster enzyme action Cooling a muscle: Slower contraction and relaxation Slower energy production Practical application: Difference may contribute to muscle injury after improper/insufficient warm-up.
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Arizona State University Gradations of Response: Force of Contractions of Whole Muscles The all-or-none law applies to the contraction of motor units and muscle fibers, but not whole muscles. Recruitment: Varying the number of motor units activated More motor units = MORE FORCE Rate coding: Increasing or decreasing the rate of firing for the motor units involved
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Arizona State University Motor Unit Recruitment and Force Production Force production can be increased by: 1. Recruiting a greater number of motor units 2. Recruiting more type II motor units (fast twitch or fast oxidative glycolytic) 3. Increasing the action potential firing rate (twitch summation) 4. Recruiting larger myofibrils (i.e. muscle fibers with more actin / myosin crossbridges).
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  • Spring '16
  • Erica Morley
  • Physiology, Arizona State

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