Contrary to the terminology, the designation of fast and slow is, in this case, not related to speed of contraction, but to length of contraction. Slow-twitch muscles are capable of prolonged “latch-states”, that is sustained contraction, which also accounts for increased strength. As human beings age, the PGC-1 isoform is lost, accounting for a decrease in strength with
Contrary to the terminology, the designation of fast and slow is, in this case, not related to speed of contraction, but to length of contraction. Slow-twitch muscles are capable of prolonged “latch-states”, that is sustained contraction, which also accounts for increased strength. As human beings age, the PGC-1 isoform is lost, accounting for a decrease in strength with