The soleus and the EDL were selected because the former is a postural muscle with a large number of slow-twitch
motor units, while the latter contains a large number of fast-twitch motor units with less motor-unit recruitment in ordinary movements.
Such activities were better performed by muscles with endurance that "operate at a lower cost," Umberger said, and now more than two-thirds of human muscle fibers are slow-twitch
Peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1a) is a protein encoded by the PPARGC1a gene, which is involved in mitochondrial biogenesis, fatty acid oxidation, glucose utilization, thermogenesis, angiogenesis and muscle fiber-type conversion toward slow-twitch
type I fibers (Ahmetov and Rogozkin, 2009).
However, the soleus is comprised primarily of slow-twitch
fibers (80 to 100%), which have lower hypertrophic potential in comparison to type II fibers (50).
Transcriptional co-activator PGC-1 alpha drives the formation of slow-twitch
The slow isoform of myosin heavy chain (MHC1) was higher in soleus slow-twitch
type I muscle (SOL), while type IIa red gastrocnemius (RG) had higher expression of the intermediate myosin heavy chain isoforms (MHC2a and MHC2x), and MHC2b isoform was the predominant one in fast-twitch type IIb white gastrocnemius (WG).
The current study demonstrates that treatment with the NOS inhibitor, L-NAME, for 8 weeks significantly increases the percentage of Type IIA fibers, with a concomitant decrease in the percentage of Type I fibers in the slow-twitch
fiber-rich soleus muscle.
All of us are born with a mix of fast- and slow-twitch
What's the difference between light meat and dark meat, or slow-twitch
fibers and fast-twitch fibers?
Red meat is composed of slow-twitch
muscle fibres, which are built for sustained periods of activity, so animals that are active for longer amounts of time throughout the day would be composed of mostly red meat.
I want slow-twitch
muscles controlling my aim as much as possible.
The soleus responds well to light weight, fewer sets and more repetitions, since it is made up mainly of slow-twitch