“…Type IIx and IIb diaphragm fibers have larger cross-sectional area (Greising et al, 2013a, Lewis and Sieck, 1990, Miyata et al, 1995, Prakash et al, 2000, Sieck et al, 2012, Sieck et al, 1989b, Zhan et al, 1997), lower mitochondrial volume densities and oxidative capacities than type I and IIa fibers (Enad et al, 1989, Sieck et al, 1996). Type IIx and IIb fibers display the fastest maximum shortening velocities and generate the greatest specific forces of all fiber types (Geiger et al, 2002, Geiger et al, 2001, Geiger et al, 2000, Geiger et al, 1999).…”