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24 Cards in this Set
- Front
- Back
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Ability to shorten when stimulated.
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contractility
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Force is generated and muscle shortens.
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concentric contraction
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Force is generated and muscle is lengthened.
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eccentric contraction
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Force is generated with no movement in the joint.
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isometric contraction
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Ability to be stimulated with a nervous impulse.
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excitability
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Excitability:
The functional "motor unit" of muscular contractions consists of an... |
alpha motor nerve fiber and all of the muscle fibers it innervates.
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In a motor unit all the fibers fire...
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at the same time.
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Few muscle fibers/motor units
e.g. hand muscles |
fine control muscles
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Large number of muscle fibers/motor units
e.g. back muscles, leg muscles |
course control muscles
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DOMS
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delayed onset muscle soreness
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is an enzyme (a type of protein) found in muscle and brain. Normally, very little CK is found circulating in the blood. Elevated levels indicate damage to either muscle or brain; possibly from a myocardial infarction (heart attack), muscle disease, or stroke.
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Creatine Kinase (CK)
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Contract quickly and powerfully, but fatigue very quickly.
Used for strength predominately. Glycolytic - more anaerobic. You have a fast twitch oxidative glycolitic (FOG) and a fast twitch glycolitic (FG). These fibers will hypertrophy. |
fast twitch muscle fibers
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Contract slower and less powerfully, but are fatigue resistant.
Predominately aerobic activities. Does not hypertrophy to any great extent. May get smaller as they are worked as you increase capillaries you possibly decrease fiber size. Oxidative. |
slow twitch fibers
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Type is genetically predetermined, but...
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training can affect some of the contractile characteristics noted above.
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Most people are ____ fast twitch/slow twitch or slow twitch/fast twitch.
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60/40
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As you age you lose more...
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fast twitch muscle fiber.
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Ability to propagate an electrical stimulus.
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Conductivity
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Ability to mechanically "relax"
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extensibility
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Ability to be stretched beyond resting length.
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elasticity
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A muscle will not respond (twitch or contract) until it is stimulated above a Threshold Potential, then it will always contract maximally.
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All or none principle
(twitch physiology) |
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A single contraction that lasts only a fraction of a second.
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twitch
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The addition of many single twitches.
A sustained contraction=tetanic contraction. |
summation
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Progressively increasing the involvement of additional motor units.
Tend to recruit slow twitch fibers first. |
recruitment
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a sustained contraction.
Not done normally unless purposefully done through outside source. |
tetanic contraction
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