Maintaining a posture for a prolonged period of time requires muscles that are slow to fatigue and able to make small adjustments in muscle tension
Therefore, muscles with a high percentage of ____________________ muscle fibers would be very active during a maintained posture.
a. Type I
b. Type IIB
c. Type IIA
ANS: A
Type I, oxidative, slow-twitch muscle fibers have a slow rate of fatigue compared to the more
glycolytic types IIa and IIb. All muscles have a combination of all fiber types, but in varying
proportion. Muscles used in more endurance-type activities, such as postural muscles, would most
likely have a higher number of type I fibers in order to be most effective.
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