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15 Cards in this Set
- Front
- Back
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Action potential
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The change in skin voltage
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Electromyography
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The detection and recording of AP
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2 Factors of Muscle contraction
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1) Gradual activation of more motor neurons
2) Increase frequency of motor neuron action potential for each active motor unit |
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Tetanus
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a smooth, sustained muscle contraction that results from high frequency stimulation (frequency of AP delivered to the motor units)
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Fatigue
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A condition in which the muscle gradually loses some or all of its ability to contract after contracting for an extended period of time
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Dynamometry
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procedure of measuring the force
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Dynagram
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visual recording of force
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Latent period
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Interval from stimulus application until the muscle begins to shorten
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Threshold
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The voltage at which the first perceptible contractile response is obtained
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Maximal response
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no matter how much more voltage is applied there are no more muscle fibers to contract (all muscle cells stimulated)
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Summation
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a phenomenon in which when a muscle is stimulated with a rapid series of stimuli of the same intensity before it has had a chance to relax completely, the response to the 2nd and subsequent stimuli is greater than the 1st stimulus
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Complete tetanus
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stimulation of a muscle at an even higher frequency, producing a “fusion” (complete tetanization) of the summated twitches, where there is absolute no relaxation observed
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Treppe
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the phenomenon of gradual increase in the extent of muscular contraction following rapid repeated stimulation
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Multiple motor unit summation
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Increasing the voltage used to stimulate the muscle will increase the number of motor units contracting at the same time
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CAP
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compound action potential, is the electrical signal recorded from a nerve representing the summed electrical activity of all the nerve fibers
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