Unit_4_Lecture_1 - Kinesiology 1223 Todays Lecture Movement...

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Kinesiology 1223 Today’s Lecture Movement Roles of Muscles, Human Leverage Systems, Torque, Types of Muscle Tension, Lever Systems, and Graded Contraction, Smooth Muscle, Length-Tension Changes, Regulation of Contraction (p. 291-295, 324- 325, 420-425, 431-434) Be Prepared ! Read Topics Before Lecture! Next Lecture: Smooth Muscle Continued, System of Integration and Coordination, Nervous System Functions and Organization, CNS, PNS, ANS, Cells of the Nervous System, Structure and Function, Nerves and Nerve Tracts (p. 442-475)
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Quiet Please Turn off cell phones, PDA’s and beepers
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Unit 4 Muscular System – Part II Begin systems of Integration and Coordination Nervous System – Part I
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How muscles cause movement Physiological process: Myosin cross bridges pull actin Sarcomere shortens Develops tension Pulls on bone attachment sites Movement occurs
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How muscles cause movement continued Only way muscle can cause movement To cause movement at specific joint: Muscle must cross joint Have attachments on either side of joint
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Movement Roles of Muscles Describes muscle activity during a movement 1) Agonist or Prime Mover Muscle primarily responsible for causing movement Ex. Quadriceps = PM for knee extension
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Movement Roles of Muscles cont. 2) Antagonist Opposes particular movement of agonist Antagonistic movements and muscles (hip): Movement Agonist Antagonist Flexion Iliopsoas Gluteus Max. Extension Gluteus Max. Iliopsoas
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Iliopsoas Gluteus maximus
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Movement Roles of Muscles cont. 3) Synergists Muscles help another muscle Synergy – cooperative action Heavy load Some positions: Biceps: Synergist during fast supination or heavy load
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Movement Roles of Muscles cont. Synergists Neutralizer: Type of synergist Neutralizes unwanted movements 2 joint muscle simultaneously causes motion at both joints But we don’t want 2 movements
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Movement Roles of Muscles cont. If we only want supination Must neutralize flexion Triceps neutralizes elbow flexion during supination
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Movement Roles of Muscles Movement Role – depends on movement situation Triceps Prime mover – elbow extension Antagonist during elbow flexion Neutralizer during supination with extended elbow
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Human Body Leverage System Body functions in movement as a system of levers Bones, joints and muscles constitute lever system Lever - type of simple machine Use to gain an advantage in Force, Speed or Range
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Human Body Leverage System cont. Advantage: Able to do less and get more
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This note was uploaded on 11/16/2010 for the course KINESIOLOG 1223 taught by Professor Rooney during the Spring '09 term at Temple.

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Unit_4_Lecture_1 - Kinesiology 1223 Todays Lecture Movement...

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