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We evaluated the relative changes in tissue oxygenation during and after exercise in human lumbar muscle using near-infrared spectroscopy. Oxygenation changes in the trunk muscle were measured non-invasively using near-infrared spectroscopy (NIRS). The subjects analyzed were 111 volunteers over 60 year-old, comprised of two groups; the low back pain (LBP) group who complained of low back pain lasting more than 3 months and the non-LBP group who had no complaints of back pain. A near-infrared spectrophotometer was applied on the back, while maximally extending and bending the lumbar spine for 15 seconds, and isometric exercise in a standing position for 10 seconds. On lumbar extension, the amount of relative change in oxygenated hemoglobin (Oxy-Hb) and the tissue oxygen saturation index (SdO2) were significantly less in the LBP group than in the non-LBP group. No significant differences in deoxygenated hemoglobin (Deoxy-Hb) were found between the two groups on both extension and flexion. Relative changes of Deoxy-Hb and SdO2 were significantly higher in the LBP group than in the non-LBP group. The increase of Oxy-Hb during lumbar extension is conceived as the most available parameter in NIRS measurements, taking into account the performance of exercise even in patients with severe low back pain.

Intramuscular oxygenation of exercising trunk muscle in elderly persons