It grows up to 12 feet tall in USDA zones 5 through 9. Another shrub, called the wayfaringtree viburnum (Viburnum lantana Mohican), grows 7 or 8 feet tall, blooms for three weeks in May and produces orange-red berries in July that ripen to black near summer's end. It grows in USDA zones 4 through 8.
fast-twitch (FT) fiber. a muscle fiber that can develop high tension rapidly. It is usually innervated by a single alpha neuron and has low fatigue resistance, low capillary density, low levels of aerobic enzymes, and low oxygen availability. FT fibers are used in such activities as sprinting, jumping, and weight-lifting.
The most distinct type had long twitch times, low peak forces and high resistance to fatigue. Biochemically, these fibers were found to be high in oxidative enzymes, but low in glycolytic markers and ATPase activity. These have been termed slow fibers.Fast, Fatigue Resistant. Of the fibers with faster contraction times, some were found to maintain their force production even after a large number of contractions. They tend to be high in oxidative and glycolytic enzymes and ATPase activity.These have been termed Fast Resistant (FR) or (histochemically) Fast Oxidative-Glycolytic (FOG).he cardiac beta is also found in slow skeletal muscle fibers (in which case it is called type 1). The remaining forms are found in fast skeletal muscle. Type 2a is found in most FOG fibers, and type 2b and 2x in FG fibers.