Figure 3.

(A) A representative highly spectrally resolved ³¹P-MRS spectra. For better visualization, a 1,5-Hz Lorentzian apodization filter was applied to reduce noise in the spectra. (B) Time course of a ³¹P MR spectra during a knee extension exercise with depicted depletion of the PCr signal and its subsequent re-synthesis during the recovery period. (C) Saturation transfer spectra showing the effect of γ-ATP saturation, at ~-2.48 ppm (solid line) on the Pi signal compared to the control experiment with saturation at ~12.52 ppm (dashed line).