Most muscles that are involved in maintaining posture contain high percentages of slow oxidative fibers.
Slow oxidative fibers are present in muscles and are also called "red fibers".
A large number of mitochondria are found in slow oxidative fibers and also they are the principal source of energy.
As these fibers are responsible for maintaining posture so they show increased resistance to fatigue, stress, and anxiety.
Also, they have slow contraction speed and high resistance, therefore, are the most efficient and highly effective fibers of the body.
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