Muscle fibers can be broken down into two main
types: slow-twitch (Type I) muscle fibers and fast-twitch (Type
II) muscle fibers. The difference in types is influenced by how the muscle
responds to training and physical activity. On average, we have about
50 percent slow twitch and 50 percent fast twitch fibers in most of the muscles
used for movement.
Skeletal muscle is made up of bundles of individual
muscle fibers. Each muscle fiber contains myofibrils, which is made up of
strands of actin and myosin proteins that are responsible for contracting and
relaxing our muscles. Whether it's crushing
long-distance marathons or finishing 100-meter sprints, muscle fiber types have
a big influence on our athletic performance. Type II muscle fibers are
generally used by athletes who need to be explosive and the quicker they can
recruit those fibers, the more power they will be able to generate. This
article explains each fiber type in further detail and demonstrates how an
athlete can develop their type II muscle fibers.
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