red fibers

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red fi·bers

red skeletal muscle fibers that are rich in sarcoplasm, myoglobin, and mitochondria; they are smaller in diameter and contract more slowly than white fibers.
Synonym(s): slow fiber
References in periodicals archive ?
Prox1 gene transfer into fast muscles converted them towards the slow fiber type in mice, whereas Prox1 deletion increased the activity of fast fiber genes.
In the mdx mouse, PGC-1[alpha] overexpression in skeletal muscle also results in a fast to slow fiber type shift, a restoration of in vitro muscle function, and attenuation of muscle injury [16].
Further, the additional fast to slow fiber shift and eMHC-positive fibers suggested differences in the loading and remodeling of the parasternal intercostals.
Slow Fiber Studios, a part of the World Shibori Network: www.
Several studies have shown that calcineurin controls the skeletal muscle fiber type by stimulating slow muscle gene promoters and slow fiber differentiation both in cultured cells and in vivo (Chin et al.
The cephalocarid abdominal muscle has sarcomeres of 5 [mu]m, suggesting a slow fiber type; this is in keeping with the relatively slow movements of the abdomen.
In scientific literature, data on this problem are poor, but begin to leave to catch a glimpse of hope for a transformation of slow fibers in fast fibers.
16) Humans have genetically determined mixtures of fast and slow fibers.
In the plantaris muscle of cats, slow fibers have 25 to 50% more myonuclei in a longitudinal section and a smaller average myonuclear domain size compared with fast fibers (Allen et al.
A study associating age and modification in fiber types in swine aged 6-18 months revealed that slow fibers decreased in both rectus abdominis and vastus medialis muscles, and slow fibers were more numerous in the vastus medialis muscle.