10.7: M Tone, Isometric/Isotonic, Length-tension, M Fatigue

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5 Terms

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Muscle tone

  • resting tension in muscle

  • involuntary nervous stimulation

  • some motor units stimulated randomly at any time

    • changes to prevent fatigue

  • not generate enough tension for movement

  • decrease during sleep

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Isometric contraction

  • tension is increased, not enough to overcome resistance

  • muscle length stays the same

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Isotonic contraction

  • tension overcomes resistance

  • tone stays constant but length changes

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Length-Tension Relationship

  • tension muscle produces depends on length and time of stim

  • @resting length generates maximum contractile force, optimal overlap thick and thin filaments

  • @shortened length weaker force, filament movement is limited

  • @extended length weaker force, minimal thick and thin filament overlap for crossbridge formation

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Muscle fatigue

  • reduced ability to produce muscle tension

  • cause decrease in glycogen stores during prolonged exercise