Force and Velocity of Muscle Contraction

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8 Terms

1
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4 things that affect the force of muscle contraction?

  1. # of fibers stimulated (more units recruited, greater force)

  2. size of fibers ( greater cross-sectinal area, greater strength)

  3. frequency of stimulation

  4. degree of muscle stretch (length-tension relationship)

2
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Hypertropy:

Internal Tension:

External Tension:

Optimal resting length:

  • increase in size

  • force generated by crossbridges and stretching series of elastic components that become taut

  • tension transferred to load

  • length at which they can generate maximum force

3
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What two ways muscle fibers can be classfied?

-Speed of contraction (Slow/Fast) & pathways for forming ATP (Oxidative;Aeorobic/ Glycolytic; Anaerobic)

4
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Speed of contraction reflects….

how fats their myosin ATPases spilt ATP

5
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SLOW OXIDATIVE FIBERS

  • Speed of Contraction

  • Myosin ATPase activity

  • Primary Pathway for
    ATP synthesis

  • Myoglobin Content

  • Glycogen Stores

  • Recruitment Order

  • Rate of Fatigue

  • SLOW

  • SLOW

  • Aerobic

  • HIGH

  • LOW

  • First

  • Slow (fatigue resistant)

6
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FAST OXIDATIVE FIBERS

  • Speed of Contraction

  • Myosin ATPase activity

  • Primary Pathway for
    ATP synthesis

  • Myoglobin Content

  • Glycogen Stores

  • Recruitment Order

  • Rate of Fatigue

  • FAST

  • FAST

  • Aerobic (some anaerobic glycolysis)

  • HIGH

  • Intermediate

  • Second

  • Intermediate (moderately fatigue resistant)

7
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FAST GLYCOLYTIC FIBERS

  • Speed of Contraction

  • Myosin ATPase activity

  • Primary Pathway for
    ATP synthesis

  • Myoglobin Content

  • Glycogen Stores

  • Recruitment Order

  • Rate of Fatigue

  • FAST

  • FAST

  • Anaerobic Glycolysis

  • LOW

  • HIGH

  • Third (fastest to move)

  • Fast (fatiguable)

8
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Aerobic/Endurance Exercise

  • Increase ____ surrounding fibers

  • Increase # of ______

  • Synthesize more ____

  • Can change ?

Resistance Exercise

  • what does it do do muscle cells?

  • what tissue increases within muscle?

  • Can change?

  • capillaries

  • mitochondria

  • myoglobin

  • fast glycolytic fibers to fast oxidative

Hypertrophy

Connective

fast oxidative to fast glycolytic