Fig. 3.

Differences in fiber types in the vastus lateralis based on age, sex, and handgrip strength in patients with femur fracture. The fasttwitch muscle fibers were evaluated using immunostaining in the vastus lateralis. (A) The proportion of type IIa and IIx fibers was compared between the young and old groups. (B) The proportion of type IIa and IIx fibers was compared between men and women. (C) The proportion of type IIa and IIx fibers was compared between the top 50% and bottom 50% of handgrip strength. Data are expressed as mean±standard error of the mean. ^aP<0.05 compared with the corresponding controls.