Fast Twitch vs Slow Twitch

[fightbackhxc21]

can anyone help me out here? the answer might be more extensive then i think.
What groups are slow twitch which are fast? i know the abs are slow. and the biceps fast?

[rootb33r]

There is no muscle that is solely fast or slow twitch. Every muscle has a combination, which is approximately 50%. Everyone is different, which is why some people are better at sprinting and some are better at long distance running (fast and slow twitch, respectively).

Slow twitch fibers are more efficient at aerobic fuel production (using oxygen to make ATP). Fast-twitch fibers are less-efficient at aerobic, but utilize anaerobic fuels more efficiently; this also means they fatigue quicker.

Fiber Type and Performance
Our muscle fiber type may influence what sports we are naturally good at or whether we are fast or strong. Olympic athletes tend to fall into sports that match their genetic makeup. Olympic sprinters have been shown to possess about 80 percent fast twitch fibers, while those who excel in marathons tend to have 80 percent slow twitch fibers.

[Chicken_Hawk]

If you search some of the ABC journal articles you will find some additional info. But short of a muscle biopsy you will have a hard time determining exact ratio's.

Hawk

[fightbackhxc21]

so obviously it would be a good idea to do reps both fast and slow?

[Gibbster]

Yup....keep it mixed up. Not only the cadence of your reps but number of reps and sets too.

[Commander]

http://www.abcbodybuilding.com/fiberratios.html

Here is the link with all the fiber ratios. But as stated, you should use both rep speeds.