It depends on the efficient release of calcium from sarcoplasmic reticulum which was not affected in fast muscles
. The prolonged HRT in soleus muscle is due to increased type 1 fibers leading to a relative reduction in fast fibers especially 2A fibers causing the delay in calcium release14.
Kasuga, "Plasticity of the transverse tubules following denervation and subsequent reinnervation in rat slow and fast muscle
fibres," Journal of Muscle Research and Cell Motility, vol.
Vrbova, "Impairment of developing fast muscles
after nerve injury in the rat depends upon the period of denervation," Journal of the Neurological Sciences, vol.
Few studies are extant that analyze myostatin expression in slow and fast muscles
Consistent with established patterns in crustacean muscles (Jahromi and Atwood, 1969; Ismail and Mykles, 1992; West, 1997), we detected significant differences in the myosin/actin ratio among the different fiber types, with the fast muscles
having proportionately more myosin (Fig.