Fast and slow-twitch muscles, what does it mean?

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Fast and slow-twitch muscles, what does it mean?
March 31 2008
 

I’m here to share with you another excerpt from the Lose Fat, Not
Faith transformation kit: Lose Fat, Not FaithLose Fat, Not Faith

Have you heard about muscle fiber types? If you have, then you are familiar with the concept of "fast-twitch" and "slow-twitch" muscle fibers. If not, we will describe this briefly in the following excerpt.

Of course, knowing about muscle fibers is fine … but how does it apply to you? Knowing your muscle fiber type will help you design the right training program for YOUR body. Of course, the only way to truly know your muscle fiber types is to perform a biopsy. I’m assuming you don’t want to do this … well, this excerpt from the Training Encyclopedia that is included in the Lose Fat, Not Faith transformation kit explains just how to determine what fibers you have and how they can impact your training!

Fiber Distribution

Fiber distribution refers to the composition of your muscles. There
are various types of muscle fibers. Some fibers can handle high
repetitions of weight but are not equipped to deal with high
intensity (i.e. very heavy loads). Other muscle fibers can handle
heavy loads, but damage easily and cannot handle multiple
repetitions. By performing a very simple test, you can determine
what distribution your various muscles are and adjust your training
accordingly.

The test is straightforward. For the muscle you are targeting, and
we’ll use chest as an example, pick a standard exercise (in this
case, the bench press) and a weight that you can perform about 10
reps. This means that if you used that weight and pushed the
barbell until you couldn’t possibly lift it any more, you would
complete about 10 repetitions. This is known as your 10-rep max.

See our one-rep max calculator:

One-Rep Max Calculator

Now, simply perform 7 sets to failure. That’s it! Load the weight,
push out as many repetitions as you possibly could do, rest exactly
one minute, then repeat for a total of 7 repetitions.

Besides being a great workout in itself, this will tell you exactly
how to design your training program! Let’s explain. If you were to
perform the above test and your repetitions for each set looked
like this:

10, 10, 9, 9, 12, 11, 10

We would know you had a high endurance fiber distribution in your
chest. It may seem odd that you would suddenly have a higher rep set after fatiguing, but this can actually occur. It is a phenomenon
known as neuromuscular facilitation and happens as your central
nervous system adapts to the workout. For muscles that exhibit this
type of fatigue, you would want to perform higher repetitions - when
the typical recommendation is 12 reps, for example, you would
perform 15 - 20. When the typical recommendation is 4 reps, you
might perform 8 reps instead.

If your scores looked like this:

10, 8, 4, 2, 1, 1, 1

Then we would know this muscle fatigues quickly. We would assume it contains fast-twitch or "explosive" fiber. This muscle has more
potential to increase in size, but you must take care not to
annihilate it. For muscle groups that exhibit this type of fatigue,
we would work fewer repetitions. If the typical recommendation is 12
reps, you would perform only 8 - 10. If the recommendation were 4
reps, you would perform 2 - 3 reps instead.

This will be a continuum between fast and slow twitch, so there is
no exact method other than an actual biopsy of your muscle to
determine the structure. This type of test, however, can help you
get closer to a program that is right for you.

This is one of the many training gems that are contained in the
299-page Training Encyclopedia, that is included in your Lose Fat,
Not Faith transformation guide. To pick up your copy today, visit:

Lose Fat, Not Faith Transformation Kit

 

Sincerely,
Lewis + Sarah
www.atozfitness.com

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