mechanism of body movementstaff.ui.ac.id/system/files/users/jull.kurniarobbi/... · mechanism of...
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Mechanism of Body Movement
J. KurniarobbiSports Medicine Program - FMUI
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Movement is the Sign of Survival for Life
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The Science of Movement
• Kinesiology is the study of the human body during movement. There are many disciplines within kinesiology including anatomy, neuromuscular physiology, and biomechanics.
• Biomechanics is part of kinesiology that deals with the investigation and application of mechanics to human body
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Structures Implied in Movement
• Bones• Joints
• Muscles• Brain and nerve
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Bone Functions in Movement• Support• Levers & linkages that allow for movement• Shock absorption, force transmission• Provide broad surfaces for muscle
attachment• Support weight• Dissipate loads• Alter angle of muscle insertion
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Types of Bones Long bones Short bones Flat bones Irregular bonesSesamoid bones
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Types of Joints
• Immovable–Skull–Pelvis
• Moveable– Hinge– Gliding– Pivot– Saddle– Ball & Socket– Condyloid
•With each movable joint comes set of muscles
•Muscle have origin and insertion (usually into bone)
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Muscles of the Body
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Functions of Muscles
• Produce movement• Maintain postures and positions• Stabilize joints
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Typesof Muscle
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How Does Muscle Move a Joint?
• Muscle fibers generate force
• The force is vector sum of the forces of its fibers
• The magnitude of that force is often erroneously called “force”
• The direction of that force is called “Force Generating Axis”
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Joint MotionsJoint Motions
• Abduction• Adduction• Flexion• Extension• Hyperextension• Circumduction• Internal Rotation• External Rotation
• Horizontal adduction
• Horizontal abduction
• Plantarflexion• Dorsiflexion• Inversion• Eversion• Right/left tilt
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Planes of Movement
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Kinematic and Kinetic
• Kinematic:Analysis of motion/movement allowed by organism body
• Kinetic:Analysis of forces involve in organism motion/ movement
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Head and Neck Kinematic
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Shoulder Joint Kinematic
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Arm and Hand Kinematic
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Trunk Kinematic
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Upper and Lower Leg Kinematic
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Hand and Foot Kinematic
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Brain
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Nerve
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Roles of Muscle in Movement
Agonist• Muscle that produces desired movementAntagonist• Oppose motion of agonistStabilizer• Muscles that act in one segment so that
movement in an adjacent segment can occurNeutralizer• Muscles that eliminate an undesired action of
another muscle
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Muscle Roles
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Muscle Actions
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Muscle Attachment
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Levers in the Human BodyLevers in the Human Body
• Lever is a rigid bar rotating on an axis• Fulcrum (axis)- point of support, axis of
rotation• Moment arm- perpendicular distance from
line of action of a force to the axis of rotation
• Torque (moment)
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Lever Systems
•First ClassForce-Axis-Resistance
•Second ClassForce-Resistance-Axis
•Third ClassResistance-Force-Axis
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First Class Lever• A lever in which the
muscular force and resistance force act on opposite sides of the fulcrum
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Second Class Lever
• A lever in which the muscle force and resistance force act on the same side of the fulcrum, but the resistance force acts at a point closer to the fulcrum than the muscle force
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Third Class Lever
• A lever in which the muscle force and resistance force act on the same side of the fulcrum, but the muscle force acts at a point closer to the fulcrum than the resistance force.
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Movement
• Basic movement:walk, run, jump, throw, catch, strike etc
• Goal oriented movement:writing, typing, bicycling etc
• Adaptive movement:use of prosthetics, crutches etc
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Walking
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Walking
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Running
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Running
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Jump Forward
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Jump Upward
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Summary• Movement is a complex process involving
bones, muscles, joints, brain and nerve working in harmony
• Body movement consists of body segment motions
• Structure defines movement or movement defines structure?
• Study of human movement is a frontier in health and medical sciences
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Movement is universal need of mankind