Biomechanics

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Author:
cheerios258
ID:
211809
Filename:
Biomechanics
Updated:
2013-04-06 17:34:21
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strength
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Description:
strength, power
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  1. Which statement is False?

    A) An athlete must be strong to be powerful.
    B) An athlete can be powerful and not strong.
    C) Strength and power are related but distinct capacities.
    D) An athlete can be stong but not powerful.
    B) An athlete can be powerful and not strong.
    (this multiple choice question has been scrambled)
  2. What is muscular strength?
    the amount of force a muscle group can exert against a resistance in one maximal effort.
  3. what is power?
    Ability to produce high levels of work quickly.
  4. What is the sliding filament theory?
    the actin and myosin filaments slide past each other causing the filaments to attach themselves which results in a forceful pull on the tendons.
  5. what is inside the muscle fibers?
    numerous myofibrils
  6. what is each myofibril composed of?
    numerous sarcomeres that are joined end to end
  7. What are the two filaments in sarcomeres?
    actin and myosin
  8. which filament in the sarcomere is thinner, actin or myosin?
    actin
  9. What are the 2 types of muscle fibres?
    Type I (ST) and Type II (FT)
  10. ST fibers posses a ____ endurance quality.
    aerobic
  11. True or False.
    FT fibers produce more force than ST fibers.
    true
  12. which type of fiber fatigues more rapidly?
    Fast twitch type 2 fibers
  13. Which fibers are recruited during low-intensity activities?
    ST (type 1)
  14. What is muscular hypertrophy?
    the individual muscle fibres increase in size
  15. what is muscular hyperplasia?
    the individual muscle fibres split and as a result the number of muscle fibres increase
  16. What are the 2 propsed methods of muscular growth?
    muscular hypertrophy and muscular hyperplasia
  17. what is a motor unit?
    the alpha motor unit and all the muscle fibres it intervates
  18. What is the primary method of muscular growth in humans?
    muscular hypertrophy
  19. Recruitment starts from lower motor units (ST) to higher
  20. What is concentric contraction?
    • aka: shortening.
    • when the tension developed is greater then the resistance and the muscle shortens
  21. What is Eccentric Contraction?
    lengthening contraction: when the tension developed is less than the resistance and the muscle attempts to shorten but is actually lengthened
  22. What is an Issometric contraction?
    static contraction: tension developed is the same as the encountered resisitence and the length of the musculature remains essential unaltered.
  23. What is an agonist muscle
    The muscle or muscle group that causes the action
  24. What is the antagonist muscle?
    the muscle or muscle group located on the opposite side of the joint, acts to resist the activity
  25. What is the stabilizer muscle?
    serves to stabilize the skeletal structures so the tension can be effectively developed by the prime mover
  26. muscular tension is most effectively achived at the normal reting length of muscle because...
    this enables max binding of actin and myosin filaments
  27. More force can be produced through which phase?

    A) eccentric
    B) isometric
    C) concentric
    A) eccentric
    (this multiple choice question has been scrambled)
  28. Neural adaptations include all except?
    A) Increased firing rate (rate coding)
    B) Incresed antagonist activation
    C) Motor Unit synchronization
    D) Disinhibition (GTO)
    E) Effect of learning
    B) increased antagonist activation
    (this multiple choice question has been scrambled)
  29. Relative measures of power...

    a) are computed by multiplying power by the number of repetitions

    b) are computed by dividing the score by stature

    c) allow for better comparison of athletes of differing body weights

    d) are useful when total strength, power and momentum are important in a particular sport
    c) allow for better comparison of athletes of differing body weights
  30. A general-to-specific approach to resistance training progression implies that...

    a) novice lifters require great variation in program design.

    b) general programs work best in advanced to elite athletes.

    c) advanced to elite athletes require greater variation and specificity in program design for progression.

    d) none of the above
    c) advanced to elite athletes require greater variation and specificity in program design for progression.
  31. It is generally accepted that resistance training can promote changes in muscle fibers from...

    A. type IIa to type IIx
    B. type II to type I
    C. type I to type II
    D. type IIx to type IIa
    D. type IIx to type IIa
    (this multiple choice question has been scrambled)
  32. What specific stimulus does the Golgi tendon organ detect?

    A. muscle temperature
    B. velocity of muscle contraction
    C. tension in the muscle
    D. change in muscle length
    e. none of the above
    C. tension in the muscle
    (this multiple choice question has been scrambled)
  33. Several studies have demonstrated a reduction in EMG activity before and during ground contact in subjects unaccustomed to Stretch Shortening Cycle (SSC) loads.  This attribute is...

    A. a protective mechanism by stimulation of Golgi tendon organs
    B. a protective mechanism by way of the myotatic stretch reflex
    C. an excitation mechanism by way of long loop reflexes
    D. an excitation mechanism by intrafusal muscle fibers
    A. a protective mechanism by stimulation of Golgi tendon organs
    (this multiple choice question has been scrambled)
  34. What is the gerneral to specific progression model?
    The amount of variation needed incresases as the an athlete goes from a novice to elite
  35. p= __/___?
    p= w/t
  36. combination of Ecc & Con actions is called...
    short shortening cycle
  37. What is the stretch shortening cycle?
    occurs when muscle fiber is activated, stretched, then immediately shortened
  38. ECC or ISSO before CON gives more time and distance for agonist to develope force prior to ___ contraction.
    Concentric
  39. Motor Tendon Unit = ___
    storage of elastic energy

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