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Schematic of the in vivo exercise-recovery protocol. Electrical stimulation was used to induce muscle contractions and deplete PCr levels. Following 5 min of stimulation, spectral subspace training data were acquired using a CSI sequence, which was followed by a proton reference scan, a spiral-CSI dynamic imaging scan, and another set of proton reference and CSI scans. The start of the spiral-CSI acquisition corresponded with the ending of electrical stimulation.
