Mar 22, 2012 - 10:14 AM
Type I slow twitch muscle fibers are smaller in size, slower to fatigue, and produce long term contractions ( stabilization ). Noting the “s” words may help you to remember these characteristics. Since they are smaller in size, it makes sense that they produce less force. They are slower to fatigue and have better endurance than type II fast twitch fibers because they have more capillaries, mitochondria, and myoglobin and increased oxygen delivery.
Type II fast twitch muscle fibers are “fast” or quick to fatigue due to having fewer capillaries, mitochondria, myoglobin, and decreased oxygen delivery. They also produce more force and power with their short term contractions. Since they produce more force, it makes sense that they are larger in size than type I muscle fibers. Again, noting the “f” words may help you to remember these characteristics.
Source: Lauren McHugh
Mar 22, 2012 - 11:07 AM
smaller in size, are known as slow twitch muscles and tend to be located closer
to the axis of rotation. They respond to endurance and postural control. Type II muscle fibers, larger in size, are
just the opposite; they are fast twitch and tend to be located further away
from axis of rotation. They respond to force and power.
Source: Maurice Williams