"Despite no high-level data, people thought that women had fewer fast twitch fibers and that was seen as a negative thing," said San Francisco State Assistant Professor of Kinesiology Jimmy Bagley, one of the study's co-authors. "We've shown that that is not true."
Humans have three main muscle cell (or fiber) types, and each has a different variety of a protein called myosin heavy chain ("MHC"). MHC is the "microscopic motor" that makes your muscles move, explains Bagley. Human fiber types include MHC I (slow twitch), IIa (fast twitch) and IIx (super-fast twitch). Bagley and his team analyzed muscle fibers from thigh muscle biopsies collected from six world/Olympic-class female athletes, nine national-caliber female athletes and six national-caliber male athletes during the 2017 World Weightlifting Championships held in Anaheim, California. These weightlifters had the most fast twitch (MHC IIa) fibers ever reported in athletes (67 percent...
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