This form of intense training can teach slow twitch muscle fibers to perform like fast twitch fibers.

This stimulates Type 1 slow twitch muscle fibers and type 2 a and b fast twitch muscle fibers.

It is thought to have a preferential beneficial effect on the slow twitch muscle fibers (as opposed to the fast twitch fibers used in sprint interval training).

The MYLK2 gene expresses skMLCK more prevalently in fast twitch muscle fibers as compared to slow twitch muscle fibers.

On the other hand, the main difference between the slow twitch muscle fiber (Type I) and fast twitch muscle fiber (Type II) has the same theory of the size deviations.

This in turn is a function of slim body morphology and slender legs, a preponderance of slow twitch muscle fibers, a low heart rate gained from living at high-altitude, as well as a culture of running to school from a young age.

Aims of the present study were to investigate p27 expression in levator ani muscle of symptomatic women, determine changes with age, and compare the p27 expression with histochemical detection of fast- and slow twitch muscle fibers in parallel sections.

Individuals with a high proportion of type I slow twitch muscle fibers will be relatively weaker than a similar individual with a high proportion of type II fast twitch fibers, but would have a greater inherent capacity for physical endurance.

Polar overdominance is a unique form of inheritance (described in sheep) whereby a mutant Callipyge allele must be inherited from the father to cause muscle hypertrophy.Muscle hypertrophy in the offspring is caused by an increase in the size of all skeletal muscle fibers, with the exception of slow twitch muscle fibers.

Slow twitch fibers contract for long periods of time but with little force.

Skeletal muscles in turn can be divided into fast and slow twitch fibers.

In contrast, if the process was reversed, the fast twitch fiber performed as a slow twitch fiber as well.

During transition, the fast twitch fibers may increase in size, and gradually change into the slow twitch fibers exhibiting regular size.

It is proposed that under these circumstances the ammonia is produced from slow twitch fibers by the deamination of the branched chain amino acids.

The slow twitch fibers generate energy for ATP re-synthesis by means of a long term system of aerobic energy transfer.

Slow twitch fibers are more efficient in using oxygen to generate energy, while fast twitch fibers are less efficient.

Fast twitch fibers and slow twitch fibers are also called white muscle fibers and red muscles fibers, respectively.

On the other hand, regardless of the status (quiescent fast and slow twitch fibers, myotubes in transition or degenerating) the muscle cells exhibit plasma membrane p27 staining.

Beta motor neurons innervate intrafusal fibers of muscle spindles with collaterals to extrafusal fibers (type of slow twitch fibers).

The fast twitch fibers rely on a well-developed, short term, glycolytic system for energy transfer and can contract and develop tension at 2-3 times the rate of slow twitch fibers.

If you train a fast twitch fiber to do a lot of endurance work, it will eventually get a lot better, but it will never be as good as a slow twitch fiber."

It is not uncommon to hear of some fitness trainers using reps of 50 or more, as they believe the gastrocnemius is composed of slow twitch fibers which benefit from lower weights and higher repetitions.

Most people have about equal amounts of two types of fibers - slow twitch fibers, which are best for endurance events like marathons, and fast twitch fibers, which are best for sprints.

It may well be that the type 2b fibers show enhancements of the oxidative capacity after high intensity endurance training which brings them to a level at which they are able to perform oxidative metabolism as effectively as slow twitch fibers of untrained subjects.

Note that a lack of type I staining is characteristic for fast twitch fibers only (row 1), and a lack of p27 cytoplasmic expression is characteristic for the "resting" fast- and slow twitch fibers and fibers in "early transition" (rows 1, 2 and 5).