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Series of 31P‐MR spectra obtained during plantar flexion exercise and subsequent recovery in a healthy control subject (a). The PCr recovery time constant (τPCr) showed a strong negative correlation (r = –0.64; P < 0.001) with the ABI for PAD severity (b). ATP, adenosine 5′‐triphosphate; PDE, phosphodiesters; Pi, inorganic phosphate.
