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Fractional anisotropy (FA) measured during active plantarflexion (purple) and active dorsiflexion (orange) and with relaxed musculature (green) using three different diffusion encoding sequences [pulsed gradient spin echo (PGSE), oscillating gradient spin echo (OGSE) 25 Hz, and OGSE 50 Hz]. Significantly lower FA values were measured in the tibialis anterior during active foot dorsiflexion.
