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Author Topic: Types of Muscle Fiber  (Read 201 times)
Mr. Olympia
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« Reply #15 on: September 03, 2010, 09:40:36 AM »

Fiber Type                      Type I fibers       Type II a fibers               Type II x fibers                 Type II b fibers
Contraction time                Slow                    Moderately Fast            Fast                                Very fast
Size of motor neuron        Small                    Medium                    Large                               Very large
Resistance to fatigue        High                    Fairly high                    Intermediate                  Low
Activity Used for                Aerobic                    Long-term anaerobic   Short-term anaerobic          Short-term anaerobic
Maximum duration of use    Hours                      <30 minutes            <5 minutes                          <1 minute
Power produced                Low                    Medium                    High                                  Very high
Mitochondrial density        High                    High                            Medium                          Low
Capillary density                High                    Intermediate            Low                                  Low
Oxidative capacity        High                    High                            Intermediate                  Low
Glycolytic capacity        Low                    High                            High                                  High
Major storage fuel        Triglycerides       Creatine phosphate,glycogen  Creatine phosphate, glycogen   Creatine phosphate,
glycogen

Myosin heavy chain,
human genes                MYH7                         MYH2                     MYH1                               MYH4

http://en.wikipedia.org/wiki/Skeletal_muscle

Does this mean in order to know for sure if I worked out the Type I Fibers = work out 4 more than >1hour!!???!!

If so, I'd rather just strap on some weights like clothes rather than work out for that long...
« Last Edit: September 03, 2010, 09:46:06 AM by Mr. Olympia » Logged

I want to be the very best
Like no one ever was
To catch them is my real test
To train them is my cause (oooh)
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Every muscle to understand
The power that's inside!

MY DREAM :  TO BREAK THE bench, squat, deadlift RECORDS NATURALLY!!!
dodothebird
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« Reply #16 on: September 03, 2010, 10:18:21 AM »

Fiber Type                      Type I fibers       Type II a fibers               Type II x fibers                 Type II b fibers
Contraction time                Slow                    Moderately Fast            Fast                                Very fast
Size of motor neuron        Small                    Medium                    Large                               Very large
Resistance to fatigue        High                    Fairly high                    Intermediate                  Low
Activity Used for                Aerobic                    Long-term anaerobic   Short-term anaerobic          Short-term anaerobic
Maximum duration of use    Hours                      <30 minutes            <5 minutes                          <1 minute
Power produced                Low                    Medium                    High                                  Very high
Mitochondrial density        High                    High                            Medium                          Low
Capillary density                High                    Intermediate            Low                                  Low
Oxidative capacity        High                    High                            Intermediate                  Low
Glycolytic capacity        Low                    High                            High                                  High
Major storage fuel        Triglycerides       Creatine phosphate,glycogen  Creatine phosphate, glycogen   Creatine phosphate,
glycogen

Myosin heavy chain,
human genes                MYH7                         MYH2                     MYH1                               MYH4

http://en.wikipedia.org/wiki/Skeletal_muscle

Does this mean in order to know for sure if I worked out the Type I Fibers = work out 4 more than >1hour!!???!!

If so, I'd rather just strap on some weights like clothes rather than work out for that long...


The thing is, your main target is NOT endurance fibers if you want hypertrophy. Besides, whenever you do weight training (In which your muscles are usually trained for less than a minute), type I fibers still work. If you want to focus on slow twitch fibers purely, go stand in front of a movie theater or walk for a few hours. But when you do heavy training and hit your fast twitch fibers, slow twitch fibers are still worked (It doesn't work the other way, you don't use fast twitch fibers when you're standing in front of a cinema). It just takes pretty long for slow twitch fibers to get faitgued. But you don't need to fatigue them for hypertrophy (They'll never get massive). Target the fast twitch.
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« Reply #17 on: September 03, 2010, 10:40:26 AM »


Does this mean in order to know for sure if I worked out the Type I Fibers = work out 4 more than >1hour!!???!!

If so, I'd rather just strap on some weights like clothes rather than work out for that long...


The thing is, your main target is NOT endurance fibers if you want hypertrophy. Besides, whenever you do weight training (In which your muscles are usually trained for less than a minute), type I fibers still work. If you want to focus on slow twitch fibers purely, go stand in front of a movie theater or walk for a few hours. But when you do heavy training and hit your fast twitch fibers, slow twitch fibers are still worked (It doesn't work the other way, you don't use fast twitch fibers when you're standing in front of a cinema). It just takes pretty long for slow twitch fibers to get faitgued. But you don't need to fatigue them for hypertrophy (They'll never get massive). Target the fast twitch.




Mr. Olympia: Thank you Mr. dodothebird.  YEs I'M TRAINING FOR ENDURANCE, maximum endurance WITH power increase. I was wondering if I can train my slow twitch fibers for strength, that way I will have power with MAX. stamina, and according to this website I CAN TRAIN MY SLOW TWITCH FIBERS FOR POWER, but it will NOT take on characteristics of the fast twitch fibers.  You MAY think this is not worth it, but I think it IS WORTH IT because it will be a UNIQUE experience and THAT WILL BE SOMETHING WORTH LOOKING FORWARD TO.



http://www.coachr.org/fiber.htm

 Training a FT -fibered muscle for endurance will not increase the number of ST fibers, nor will training a ST-fibered muscle for strength and power increase the number of FT fibers. With the proper training, FT -B fibers can take on some of the endurance characteristics of FT -A fibers and FT -A fibers can take on some of the strength and power qualities of FT-B fibers. However, there is no inter-conversion of fibers. FT fibers cannot become ST fibers, or vice versa. What an athlete is born with is what he or she must live with.
Although the type of fiber cannot be changed from one to another , training can change the amount of area taken up by the fiber type in the muscle. In other words, there can be a selective hypertrophy of fibers based on the type of training.

Conversely, if the athlete trains for muscular endurance, the FT fibers will atrophy while the ST fibers hypertrophy, causing a greater area of ST fibers. The area of the muscle, which began at 65% FT and 35% ST before training, may change to 50% FT and 50% ST following training, The endurance capabilities of the muscle will increase while its strength will decrease, and the athlete will lose some muscle mass, again be- cause ST fibers are lower in mass than FT fibers. The decrease in mass may be observed by a smaller circumference of the muscle.
...Most activities of daily living use ST fibers...the athlete will lose some muscle mass, again be- cause ST fibers are lower in mass than FT fibers. The decrease in mass may be observed by a smaller circumference of the muscle.


As you can see slow twitch fibers weigh less than fast twitch fibers, therefore I will have a better body weight % to strength.
« Last Edit: Today at 10:10:44 AM by Mr. Olympia » Logged

I want to be the very best
Like no one ever was
To catch them is my real test
To train them is my cause (oooh)
I will travel across the land
Searchin' far and wide
Every muscle to understand
The power that's inside!

MY DREAM :  TO BREAK THE bench, squat, deadlift RECORDS NATURALLY!!!
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