Fast Twitch Hypertrophy
- 03-29-2007, 08:49 PM
Fast Twitch Hypertrophy
How would one go about increasing fast twitch fiber size?
My Dad read something somewhere about a program by Phil Campbell and has been thinking about buying his book. Here are Phil's related links:
Ready set Go Fitness official Website
Speed Training for Sports
Is there any merit to increase overall size with this (bodybuilding applications), or is it primarily for old time athletes trying to make a comeback like my Pops?
- 03-29-2007, 08:51 PM
I 'll do fast twitch exercises to begin my workout then superset with slow twitch, the end result total annihalation of said muscles.
03-29-2007, 11:04 PM
If you are bodybuilding or practicing high-intensity cardio you should already be increasing fast twitch fiber size. Unless you are doing reps of 30.
Could you clarify this statement a bit? The reason that ready-set-go fitness seems to focus very much on the older crowd is probably due to the fact that fast twitch muscles atrophy as we age (if you don't use it you lose it). As we know, older people have a problem with lack of muscle and strength, so bodybuilding/strength training becomes very beneficial as we age.Is there any merit to increase overall size with this (bodybuilding applications), or is it primarily for old time athletes trying to make a comeback like my Pops?
03-30-2007, 11:36 AM
Heavy, heavy weights with low reps is the only way to really hit the fast twitch fibers.
You body follows a recruitment pattern when it comes to using muscle cells and motor units. Your body will always try to use slow twitch first, but depends on the weight lifted. Meaning the heavier the weight, the more fast twitch that will be recruited and the quicker they will be recruited.
03-30-2007, 08:36 PM
03-30-2007, 08:39 PM
I rather have him spend tha money on a few key health supplements personally.
03-30-2007, 08:39 PM
In that light, you could do lower weights as long as the reps were very explosive. That's kind of the premise behind plyometrics.
Explosive reps are kind of tough with squats and a bar...LOL. But doing a body weight squat and exploding upwards into a jump would hit fast twitch.
Are you training for a sport that involves explosive strength?
03-30-2007, 08:42 PM
03-30-2007, 09:17 PM
03-30-2007, 10:07 PM
bodybuilding's goal is the development of fast twitch fibers. thats why people who work out get bigger muscles. These fast twitch fibers are the ones that grow larger in diameter through weight training.
If you are doing reps higher than 15, you'd be hitting slow twitch fibers primarily.
03-30-2007, 10:32 PM
I have this vague memory of one of my college professors saying that bodybuilders, on average, had more slow-twitch muscle fibers than the average person.
I searched for about 10 minutes and couldn't find an answer either way. There may not be an answer either way.
I'm tired now though, so maybe I'll look around some more tomorrow.
03-31-2007, 12:43 AM
I pulled out my physiology textbook, it says here:
"Fast glycolytic fibers are the last to be recruited because they are found in the large motor units. These fibers are not usually recruited unless a muscle is generating a large amount of force, as occurs in high intensity exercises such as weight-lifting or sprinting." -Human Physiology, Germann and Stanfield 2001 published by Benjamin Cummings
Crunch, Slow twitch fibers are the high oxidative ones meaning they're the ones that are the endurance fibers.
As far as fiber type populations in muscles, it varies from person to person. Its all based on genetics. check out this thread about fiber type distribution:
03-31-2007, 05:40 AM
I know what fast and slow twitch fibers are, I've got a masters in ex phys.
Bodybuilding is quite different from weight-lifting or sprinting. I was talking about fiber type displacement differences in bodybuilders as compared to a normal human being. Bodybuilding is not an "explosive" sport. I imagine that when you your book refers to "weight lifters", they are referring to olympic lifting.
I'm not saying they don't have a large number of fast twitch fibers or slow twitch. Just that I thought I remembered hearing that they had a larger number of slow-twitch. I will research that some more tomorrow.
03-31-2007, 11:26 AM
Still can't find any definitive studies. But several said that fast-twitch were the ones most likely to respond to hypertrophy-type training. So who knows what I was remembering from kolege! LOL!
04-01-2007, 08:48 PM
Ain't this some sh*t, lol.
Maybe we need some Bobo for clarification.
Bottom line is, can you enlarge tha muscle fibers commonly associated with speed/explosiveness/endurance and if so how?
04-01-2007, 09:11 PM
04-02-2007, 12:19 AM
04-02-2007, 01:07 AM
04-02-2007, 08:47 AM
04-02-2007, 09:11 AM
Your body adapts to whatever type of training you give it. Remember your body is always looking to be efficient. Look at a sprinter, marathon runner, a swimmer, and a gymnast. There's your answer. Just think about what the difference is between these 4 athletes. They are living examples of how to train slow twitch as well as fast.
04-02-2007, 06:46 PM
04-02-2007, 07:00 PM
Crunch although it's true bodybuilding is different from say sprinting there's a lot we can learn from that athlete. Upper body in a sprinter is usually well built but pale in comparison to their quads, glutes, and hams. What we have to look at is the leg training and grueling way those muslces are worked day in and day out. We should be asking how can they work those muscle groups everyday and still recover to get that kind of growth. THe answer is the amount of fast twitch muslce fibers they've created in their lower body.
04-02-2007, 07:55 PM
In world-class sprinters or pro athletes of any sport for that matter, I think a lot of it comes down to recovery ability. They are able to recover from all those long grueling workouts and continue to get bigger, faster, and stronger.
Plus the genetic component to what kinds of fibers they were born with. Those sprinters had waaaay more fast-twitch cells in those legs (and everywhere else) since they were born.
Add those genetics with years of brutal workouts, and the dedication and determinitation to be the best, and you've got a world class athlete.
04-02-2007, 08:50 PM
04-02-2007, 11:01 PM
04-04-2007, 12:00 PM
Define "explosive" strength? Strength is strength, period.
Does this mean If I lift heavy weights slowly I will become more slow?Yes. Heavy weights and explosive movements for speed and explosiveness. Light weights and higher reps for endurance.
As correctly stated fibers are recruited in a set pattern, it is load and force that recruits the fast twitch muscle fibers, speed is not a factor in so much that lifting faster will recruit more fast twitch fibers, in fact the opposite is true as faster lifting speeds, increase momentum thereby actually reducing the loads on the muscle and therefore limiting the amount of actual muscle fibers called into play.
Also reps higher then 15 will increase endurance? Incorrect, it is not the reps per se, but the time under load. Sets with TUL in excessive of 120 seconds will do more to increase endurance, so one has to consider rep cadence when accounting for rep ranges.
Team H.I.T. Online
04-04-2007, 03:38 PM
04-04-2007, 03:48 PM
How would you define plyometrics?? Are they done slowly to improve speed?? If you do them slow as you imply, they will make you faster?? Is that right. Dr Chu would beg to differ with you. Heavy weights and explosive movements was written as two different things.
Heavy weights will recruit fast-twitch fibers, explosive movements will recruit fast-twitch fibers (max vertical jumps). NOT doing explosive movements WITH heavy weights, I did not say that!
Of course it's time under tension when talking about endurance and high reps, I just think it didn't need to get that in-depth for the guys father.
04-04-2007, 04:11 PM
ALR has a lot of insight on this subject. Too bad he's busy these days and doesn't post much anymore (hint-hint Viperspit & FitnFirm )
Here's a little excerpt from Building the Perfect Beast (the original one):
Originally Posted by ALR in Building the Perfect Beast
04-04-2007, 04:36 PM
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