Electromyography

Electromyography - Electromyography (EMG) Skeletal Muscles...

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Electromyography (EMG) Skeletal Muscles
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Functions of skeletal muscles • Primary Function – Convert mechanical energy to mechanical work • Other functions – Produce movement – Maintain posture and body position – Support soft tissue – Guard entrance and exit – Maintain body temperature
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Properties of muscle tissue 1. Excitability: ability to respond to stimulation 2. Contractility: ability to shorten actively and exert a pull 3. Extensibility: ability to continue to contract over a range of resting lengths 4. Elasticity: ability of muscle to rebound toward its original length after contraction
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http://trc.ucdavis.edu/biosci10v/bis10v/week10/nervemuscle.gif
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Muscle exhibit graded contractions in two ways: 1._________________ 1._________________
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Isometric: Tension but no movement Isotonic: muscle shortens as it contracts Isotonic vs. Isometric
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Concentric vs. Eccentric A concentric contraction is a type of muscle contraction in which the muscles shorten while generating force. During an eccentric contraction , the muscle elongates while under tension due to an opposing force being greater than the force generated by the muscle.
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This note was uploaded on 11/14/2011 for the course ECE 3820 taught by Professor Wang during the Fall '11 term at GWU.

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Electromyography - Electromyography (EMG) Skeletal Muscles...

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