Importantly, muscle fibers are arranged in groups of fascicles but it is known from animal experiments that
individual muscle fibers do not typically run the entire length of the fascicle and some may be arranged in series along the length of a muscle, potentially in order to reduce the effects of a slow propagation speed of muscle action potentials (Lieber & Fridén, 2000).
Overexpression of Bmal1 in the skeletal muscle has a significant effect on the architecture of the skeletal muscle in that it increases the size of
each individual muscle fiber and presence of Type IIb fibers (fast - twitch, glycolytic).
Muscle biopsies done on professional bodybuilders have shown that it was
the individual muscle fiber size that was the greatest cause of the abnormally increased muscle size, instead of the number of muscle fibers inside the muscle.
This fiber rotation allows the muscle to achieve a faster contraction velocity than the contraction velocity of
the individual muscle fibers within it, thereby negating the disadvantage that is associated with the pennation.
Six Paces Training If you want to maximize performance you have to adequately train all
the individual muscle fibers that you will use during your competition.
In summary, single fiber contraction velocity can be increased by velocity - focused training, implying that velocity - specificity might be attributed to altered contractile components of
the individual muscle fibers.
And I suggest that the reason nonlinear periodization doesn't need to include the standard training phases is that
individual muscle fibers are getting trained less frequently, thus giving them more time to recover, negating the need for standard training phases.
Thus, increasing muscle fascicle length will mean that you record a lower value of stiffness, even if
the individual muscle fibers are themselves now made of stiffer material.
In order to cause a training response in
any individual muscle fiber that muscle fiber must be trained with a sufficient level of overload, with a sufficient level of intensity.
However, we need to carry the concept of overload a bit further and apply it to
individual muscle fibers; what is true for a whole muscle is also true for individual muscle fibers.
Adding more collagen around the myofibrils increases the stiffness of
the individual muscle fibers (Gillies & Lieber, 2011).
As explained above, this does not involve a shift in muscle fiber type from type I to type II, but simply a difference in the change in size of
the individual muscle fibers.
They are made up of chains of sarcomeres in series, and run the full length of
the individual muscle fibers (Månsson et al. 2015).
This change in the optimal length at which torque is developed appears to occur because of an increase in length of
the individual muscle fibers (sarcomerogenesis).