Author Topic: What muscle fibers do you mostly have?  (Read 3078 times)

calfzilla

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What muscle fibers do you mostly have?
« on: February 23, 2010, 03:00:43 AM »
I mostly have fast twitch.  Doesn't matter if it is 5lbs, if I lift it more than 20 times my muscle burns like crazy and it feels like my arm is going to fall off.  Don't think I have many slow twitch fibers. 

Method101

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Re: What muscle fibers do you mostly have?
« Reply #1 on: February 23, 2010, 03:02:55 AM »
it changes based on what exercise i do.

When i was a runner i had more long twitch, i could run literally all day aslong as i drank gatorade and had a mars bar while running, after 2 hours you will have 0 energy otherwise.

Now since iv been on the weights for 2 years i have more fast twitch.


dr.chimps

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Re: What muscle fibers do you mostly have?
« Reply #2 on: February 23, 2010, 03:25:02 AM »
Corduroy.

JasonH

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Re: What muscle fibers do you mostly have?
« Reply #3 on: February 23, 2010, 04:11:03 AM »
it changes based on what exercise i do.

When i was a runner i had more long twitch, i could run literally all day aslong as i drank gatorade and had a mars bar while running, after 2 hours you will have 0 energy otherwise.

Now since iv been on the weights for 2 years i have more fast twitch.



Haha - that's a load of bollocks!  You can't genentically change your muscle fibre type depending on what exercise you do - you're born with a certain percentage of fast/slow twitch fibers and you're stuck with them for life.

Have you ever found yourself wondering why turkeys have some dark meat and some white meat? The explanation for the colour differences is pretty simple and has a basis in physiology. The dark meat of the turkey, or chicken, is "red" or slow-twitch muscle. The white meat is "white" or fast-twitch muscle. Most animals have some combination of these two fibre types, though the destinctions may be less obvious. Why are they differently colored? The slow muscles have more mitochondria (full of red pigmented cyctochrome complexes), and more myoglobin packed within the muscle cells. This gives them a darker, reddish color. Humans also have dark and white meat. Some of our muscles, like the soleus in the lower leg are almost all slow twitch fibres. Others such as those controlling eye movements are made up of only fast twitch fibres.

The thing to remember is that fibre type is controlled by the motor nerve that innervates a fibre. Unless you change the nerve, you won't change fibre types from fast to slow or vice versa. Just this type of experiment has been performed in animals (generally rats). There is no compelling evidence to show that human skeletal muscle switches fiber types from "fast" to "slow" due to training.

Mr Nobody

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Re: What muscle fibers do you mostly have?
« Reply #4 on: February 23, 2010, 04:21:34 AM »
Haha - that's a load of bollocks!  You can't genentically change your muscle fibre type depending on what exercise you do - you're born with a certain percentage of fast/slow twitch fibers and you're stuck with them for life.

Have you ever found yourself wondering why turkeys have some dark meat and some white meat? The explanation for the colour differences is pretty simple and has a basis in physiology. The dark meat of the turkey, or chicken, is "red" or slow-twitch muscle. The white meat is "white" or fast-twitch muscle. Most animals have some combination of these two fibre types, though the destinctions may be less obvious. Why are they differently colored? The slow muscles have more mitochondria (full of red pigmented cyctochrome complexes), and more myoglobin packed within the muscle cells. This gives them a darker, reddish color. Humans also have dark and white meat. Some of our muscles, like the soleus in the lower leg are almost all slow twitch fibres. Others such as those controlling eye movements are made up of only fast twitch fibres.

The thing to remember is that fibre type is controlled by the motor nerve that innervates a fibre. Unless you change the nerve, you won't change fibre types from fast to slow or vice versa. Just this type of experiment has been performed in animals (generally rats). There is no compelling evidence to show that human skeletal muscle switches fiber types from "fast" to "slow" due to training.

Agreed, I have never had very much endurance no matter what I did. I think thats mostly fast twitch maybe Im wrong it maybe slow twitch. I was always quick and strong but never had endurance.

Marty Champions

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Re: What muscle fibers do you mostly have?
« Reply #5 on: February 23, 2010, 05:30:21 AM »
i have superior wigger fibers it pisses people off when i shit out my fibers on them especially moderators who try to organize and collect my fiberous shits
A

io856

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Re: What muscle fibers do you mostly have?
« Reply #6 on: February 23, 2010, 05:32:56 AM »
Haha - that's a load of bollocks!  You can't genentically change your muscle fibre type depending on what exercise you do - you're born with a certain percentage of fast/slow twitch fibers and you're stuck with them for life.

Have you ever found yourself wondering why turkeys have some dark meat and some white meat? The explanation for the colour differences is pretty simple and has a basis in physiology. The dark meat of the turkey, or chicken, is "red" or slow-twitch muscle. The white meat is "white" or fast-twitch muscle. Most animals have some combination of these two fibre types, though the destinctions may be less obvious. Why are they differently colored? The slow muscles have more mitochondria (full of red pigmented cyctochrome complexes), and more myoglobin packed within the muscle cells. This gives them a darker, reddish color. Humans also have dark and white meat. Some of our muscles, like the soleus in the lower leg are almost all slow twitch fibres. Others such as those controlling eye movements are made up of only fast twitch fibres.

The thing to remember is that fibre type is controlled by the motor nerve that innervates a fibre. Unless you change the nerve, you won't change fibre types from fast to slow or vice versa. Just this type of experiment has been performed in animals (generally rats). There is no compelling evidence to show that human skeletal muscle switches fiber types from "fast" to "slow" due to training.

Type IIa and Type IIb are interchangeable

...and there is growing research to suggest prior concepts of being "born" with a ratio of type I and II fibers is entirely incorrect. I suggest you refresh yourself on modern science if you want to educate people on it...

Hope this helps

Mars

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Re: What muscle fibers do you mostly have?
« Reply #7 on: February 23, 2010, 05:36:37 AM »
how do you know you have one or the other?

Marty Champions

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Re: What muscle fibers do you mostly have?
« Reply #8 on: February 23, 2010, 05:42:50 AM »
Agreed, I have never had very much endurance no matter what I did. I think thats mostly fast twitch maybe Im wrong it maybe slow twitch. I was always quick and strong but never had endurance.

u just dont be-live u dont bro

just be-tray/try this be-leave
A

BIG_STI

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Re: What muscle fibers do you mostly have?
« Reply #9 on: February 23, 2010, 05:51:08 AM »
u just dont be-live u dont bro

just be-tray/try this be-leave

fuck off meth addict

Mars

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Re: What muscle fibers do you mostly have?
« Reply #10 on: February 23, 2010, 05:55:38 AM »
u just dont be-live u dont bro

just be-tray/try this be-leave

what?

jprc10

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Re: What muscle fibers do you mostly have?
« Reply #11 on: February 23, 2010, 06:26:23 AM »
how do you know you have one or the other?

x2

Kwon

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Re: What muscle fibers do you mostly have?
« Reply #12 on: February 23, 2010, 07:08:04 AM »
Be-lay tray-to Be-tree Dee De-Lay Rep

Reps Till Dawn Repstilliann Reptilian

Be-leave Lieve
Q

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Re: What muscle fibers do you mostly have?
« Reply #13 on: February 23, 2010, 07:48:19 AM »
All fat people have fast twitch muscles, and skinny people have slow twitch.

JasonH

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Re: What muscle fibers do you mostly have?
« Reply #14 on: February 23, 2010, 08:13:17 AM »
Type IIa and Type IIb are interchangeable

...and there is growing research to suggest prior concepts of being "born" with a ratio of type I and II fibers is entirely incorrect. I suggest you refresh yourself on modern science if you want to educate people on it...

Hope this helps

Wrong - Type IIa and Type IIb are BOTH types of fast twitch muscle fibres - the original poster was querying the possiblity of changing from fast to slow or vice versa, which so far cannot be proven. There is no scientific data out there which suggests otherwise.

Besides, Type IIa fast twitch muscle fibres are rarely found in humans anyway so the possibility that they could be interchangeable with Type IIb is almost irrelevant.

Tapeworm

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Re: What muscle fibers do you mostly have?
« Reply #15 on: February 23, 2010, 09:42:19 AM »
I mostly have fast twitch.  Doesn't matter if it is 5lbs, if I lift it more than 20 times my muscle burns like crazy and it feels like my arm is going to fall off.  Don't think I have many slow twitch fibers. 

Everyone burns at 20+ reps.  That's lactic acid for you.  I get terrible DOMS too whenever I do high reps, calves especially.


Corduroy.

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Lundgren

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Re: What muscle fibers do you mostly have?
« Reply #16 on: September 25, 2010, 06:40:09 PM »
u just dont be-live u dont bro

just be-tray/try this be-leave
I miss you dude.  :'(

Ursus

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Re: What muscle fibers do you mostly have?
« Reply #17 on: September 25, 2010, 06:54:39 PM »
You CANNOT develop new more or less fast and slow twitch muscle fibres. The % you have when you are born is the % you have when you die.

What you CAN do is maybe train the slow or fast twitch fibres more.

I would say I am mainly fast twitch.

Ares

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Re: What muscle fibers do you mostly have?
« Reply #18 on: September 25, 2010, 07:04:49 PM »
how do you know you have one or the other?

I think it's something about how many reps you can do with 80% of your maximum.

The lower the number, the more fast twitch fibers. Elite powerlifters might get 4 or 6, Endurance athletes might get 20 or more.

Ursus

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Re: What muscle fibers do you mostly have?
« Reply #19 on: September 25, 2010, 07:32:22 PM »
No way anyone can do 20+ reps of 80% of their 1RM

But yea it is somethiong along those lines how many reps you can do with a reasonable amount. My bench 1rm is 180kg. 80% of that would be 144kg. I could do maybe 6-8 with that.

Ares

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Re: What muscle fibers do you mostly have?
« Reply #20 on: September 25, 2010, 08:49:48 PM »
No way anyone can do 20+ reps of 80% of their 1RM

But yea it is somethiong along those lines how many reps you can do with a reasonable amount. My bench 1rm is 180kg. 80% of that would be 144kg. I could do maybe 6-8 with that.

Here's a link on it:

http://www.bodybuilding.com/fun/betteru25.htm