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Published online by Cambridge University Press: 10 March 2009
Nuclear magnetic resonance (NMR) imaging has recently become an accepted technique in the medical practitioner's armory (38). NMR spectroscopy (44) is a subtly different application of the same physical principles underlying NMR imaging, but the clinical potential for this modality is currently still under evaluation. The most important application of clinical NMR spectroscopy is for the nonin-vasive monitoring of changes in metabolite levels and intracellular pH of intact tissues during physiological stress or in response to pharmacological agents or disease. The 31phosphorus (31P) nucleus has been the most commonly investigated in muscle disease (39) but the applications of proton (1H), (4,5,8) and 13carbon (13C), (2,7) are currently being explored.