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Cards In This Set
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Classification of muscle produced movements
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Postural movement
ballistic movement
tension movements
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Postural movement
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Holding still-fixating-body appears to be still but is actually moving from side to side and back and forth over its base of support
Ex. Standing up
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Ballistic movement
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Forceful muscle contraction initiates the movement of the body part, but once initiated the movement continues on its own momentum
Ex. golf, piano
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Tension movements
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Require constant muscular contraction throughout the range of movement. Two types: slow tension movements and fast tension movements
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Slow tension movements
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Ex. handwriting, maintenance of tension
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Fast tension movements
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Boxing and sprinting
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Gradation of muscle contractions
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The variations in the force with which a muscle will contract. Controlled by the number of motor units contracting and summation wave
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Few motor units activated in contraction
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Weaker contraction
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Many units activated
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Stronger contraction
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Summation wave
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Impulses are sent to muscles in slow succession
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Contractile force
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The ability of a muscle to contract forcefully. Depends on size-cross sectional measurement and proportion of active fibers
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Cross sectional measurement of muscle
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Age and growth plays a part. muscle grows or can atrophy as you age. How hard you work it - weight training
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Proportion of active fibers
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We don't always have active fibers, fibers can split with working out
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Speed of contraction
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Certain muscles because of anatomical and physiological make up are able to contract with great speed. train and condition to contract more quickly
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Endurance
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The muscles ability to resist fatigue and to contract repeatedly against resistance. Influenced by..
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