Yes, the eccentric contractions need less, the same, or even more fibers to produce the same force at the same degree of muscular force.
When a force applied to a muscle exceeds the immediate force produced by muscle itself, an eccentric (lengthening) muscular contraction happens, forcing the muscle-tendon system to lengthen while contracting.
Thus, the eccentric contractions need less, the same, or even more fibers to produce the same force at the same degree of muscular force.
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