Figure 6. Tibialis anterior muscle architecture changes during isometric dorsiflexion contractions as a function of contraction intensity.

(A) Muscle fascicle length and (B) pennation angle changes of the tibialis anterior in the superficial and deep compartments at 5%, 10%, 25% and 50% of maximal voluntary isometric contraction. Negative values in (A) indicate shortening. Data are presented as mean ± standard error.