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.
Muscle fiber types can be broken down into two main types: slow twitch muscle fibers and fast twitch muscle fibers. Type II fibers can subsequently be broken down into two types: type IIA, which is referred to as fast twitch oxidative glycolytic, and type IIX, which is referred to as fast twitch glycolytic.