Figure 3. Extension of thigh muscle regions of interest across 4 participants (S1‐S4) in a representative sagittal plane for each time point (T₀-T₃). Each muscle is outlined with a distinct color. The regions of interest boundaries were consistently defined from the beginning of the semimembranosus to the last available slice of the rectus femoris, ensuring reproducibility across participants and time points. Magnetic resonance imaging scans covered a 30 cm range along the head-to-feet axis from the midpoint of the femoral head.