FIG. 5.

EKIT spectra and data fitting. EKIT spectra for observation of a: Pi, b: PCr, c: γ-ATP, d: α-ATP, and e: β-ATP at inversion delays of 0, 1, 2, and 3 seconds. The EKIT data were acquired from resting human calf muscle averaged for 7 subjects. The major chemical exchange reactions are indicated by solid black arrows while the effects of relayed MT are marked by the hollow arrows. The smaller EKIT exchange peaks were vertically enlarged (x4). The solid curves represent the least-squares fitting of all data to a five-pool kinetic exchange model shown in FIG. 1b.