Fast-Twitch Vs. Slow-Twitch

jimmyhots · 11-15-2006, 01:20 AM

Hey all, something I've never seen clearly laid out in BB literature is which muscles are fast-twitch dominant and which ones are slow-twitch dominant.

The typeI/typeII ratio will vary from individual to individual, but I'd be interested in learning what the composition ratios are for each major muscle group in the typical case.

Anyone know about this stuff?

Jimmy

jram · 01-24-2007, 03:34 PM

Hery jh;
Maybe this link will help.

http://www.teenbodybuilding.com/shane6.htm#top

**madman911** · 01-24-2007, 04:11 PM

All muscles contain all fiber types. Rather than waste too much time determining which type dominates a particular muscle group, you should train every muscle group with various rep ranges, tempos, and rest times to stimulate hypertrophy in all fibers. The spectrum of fiber-types also can change in response to training. If you want maximum hypertrophy, nail them all.

In general though, to give you something of an answer to your question, the overwhelming majority of muscles are fast-twitch dominant, with the exception of the abs, calves, forearms, and shoulders, which are usually slow-twitch dominant. Muscles that receive a lot of constant use from basic activities like standing, walking, and gripping objects are going to be slow-twitch dominant. Muscles that generate fast, powerful movements are going to be fast-twitch dominant.

jram · 01-30-2007, 11:33 AM

Good point Madman.

jimmyhots · 02-05-2007, 08:31 PM

Good info guys. What about legs, for instance quads. Wouldn't they tend to be slow-twitch dominant as well? Then there's hams & glutes...?

JH

**A.FreeRadical** · 02-15-2007, 06:41 PM

Quote:

Originally Posted by jimmyhots

Good info guys. What about legs, for instance quads. Wouldn't they tend to be slow-twitch dominant as well? Then there's hams & glutes...?

JH

It depends.

Here is a good article explaining the types of muscle fibers and how they relate to performance.

Fast and Slow Twitch Muscle Fibers

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11-15-2006, 01:20 AM	#1
jimmyhots New Member Join Date: Sep 2006 Location: St. Louis, Missouri Posts: 20 Recipes: 0 Rep Power: 0	Fast-Twitch Vs. Slow-Twitch Hey all, something I've never seen clearly laid out in BB literature is which muscles are fast-twitch dominant and which ones are slow-twitch dominant. The typeI/typeII ratio will vary from individual to individual, but I'd be interested in learning what the composition ratios are for each major muscle group in the typical case. Anyone know about this stuff? Jimmy

01-24-2007, 04:11 PM	#3
madman911 Metamorphosizing Join Date: Sep 2005 Location: Boston Area Posts: 1,526 Recipes: 0 Rep Power: 60	All muscles contain all fiber types. Rather than waste too much time determining which type dominates a particular muscle group, you should train every muscle group with various rep ranges, tempos, and rest times to stimulate hypertrophy in all fibers. The spectrum of fiber-types also can change in response to training. If you want maximum hypertrophy, nail them all. In general though, to give you something of an answer to your question, the overwhelming majority of muscles are fast-twitch dominant, with the exception of the abs, calves, forearms, and shoulders, which are usually slow-twitch dominant. Muscles that receive a lot of constant use from basic activities like standing, walking, and gripping objects are going to be slow-twitch dominant. Muscles that generate fast, powerful movements are going to be fast-twitch dominant. __________________ Millennium Sport Technologies Sponsored Athlete http://www.millenniumsport.net IMPC 2006 Novice Division Champ IMPC 2007 Open Division Champ Never underestimate the power of the bandana.

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Posted By	For	Type	Date
IronMass Forums	This thread	Refback	02-10-2007 05:16 PM

01-24-2007, 03:34 PM	#2
jram Amateur Join Date: Jul 2005 Location: Chicago Posts: 60 Recipes: 0 Rep Power: 6	Hery jh; Maybe this link will help. http://www.teenbodybuilding.com/shane6.htm#top

01-30-2007, 11:33 AM	#4
jram Amateur Join Date: Jul 2005 Location: Chicago Posts: 60 Recipes: 0 Rep Power: 6	Good point Madman.

02-05-2007, 08:31 PM	#5
jimmyhots New Member Join Date: Sep 2006 Location: St. Louis, Missouri Posts: 20 Recipes: 0 Rep Power: 0	Good info guys. What about legs, for instance quads. Wouldn't they tend to be slow-twitch dominant as well? Then there's hams & glutes...? JH