Tissue oxygen measurement & 31P magnetic resonance spectroscopy in patients with muscle tension & fibromyalgia (FM)

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Muscle tissue oxygen tension was measured by a polarographic oxygen

fine-needle probe, and inorganic phosphate and creatine

phosphate spectra were recorded using magnetic resonance

spectroscopy in patients with chronic low back pain and in

patients with fibromyalgia. Results were compared with

healthy controls. The tissue oxygen tension was markedly

higher in those with tense muscles than in normal subjects.

Magnetic resonance spectra for inorganic phosphate were

higher in patients demonstrating muscle contraction, and

intracellular pH was shifted in the alkaline direction in

cases with increased muscle tension. Results show that

hypoxia is not the result of increased muscle tension, as was

thought previously, but results from oversupply of oxygen

demanded by the muscle, leading to increased capillary

perfusion and rising oxygen tension.

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