Figure 2: Representative 31P-MRS spectrum of the human calf musculature (red) and Lorentz fit (black). All spectra were acquired on a 1.5 T whole-body scanner with a 7 cm diameter surface coil. A rectangular pulse-acquire sequence was used (pulse duration = 500 μs; TR = 3 s; 128 acquisitions). PME: phosphomonoester, : anorganic phosphate, PDE: phosphodiester, PCr: phosphocreatine, ATP: adenosine triphosphate, a.u.: arbitrary units.