TABLE 1.

General characteristics of muscle fiber types in normal, healthy muscle of horses.

	MyHC Type I	MyHC Type IIa	MyHC Type IIx
Twitch speed	Slow	Fast	Fast
Oxidative capacity	High	High	Low
Mitochondrial density	High	High	Low
Fatigue rate	Slow	Intermediate	Fast
Capillary density	High	Intermediate	Low
Force production	Low	Intermediate	High
Force velocity	Slow	Intermediate	Fast