Fig. 2.

The effect of resistance training on muscle fiber type composition. Percutaneous needle biopsies of vastus lateralis were obtained before and after 8 wk of supervised resistance training. A, Comparison of the baseline fiber composition in the two groups. MS subjects had 28% less (P = 0.03) type 1 fiber content than the control subjects. B and C, Pre- and posttraining fiber composition for the control subjects and the MS subjects, respectively. Some individuals showed modest changes in fiber composition, but in groups, there was no significant change after training.