25 March 2013 Measurement of oxygen consumption during muscle flaccidity exercise by near-infrared spectroscopy
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Abstract
Quantitative measurement oxygen consumption in the muscles is important to evaluate the effect of the exercise. Near-infrared spectroscopy (NIRS) is a noninvasive method for measuring muscle oxygenation. However, measurement results are affected by blood volume change due to changes in the blood pressure. In order to evaluate changes in blood volume and to improve measurement accuracy, we proposed a calculation method of three-wavelength measurement with considering the scattering factor and the measurement with monitoring blood flow for measuring the temporal change of the oxygen concentration more precisely. We applied three-wavelength light source (680nm, 808nm and 830nm) for the continued wave measurement. Two detectors (targeted detector and the reference detector) were placed near the target muscle and apart from it. We measured the blood flow by controlling the intravascular pressure and the oxygen consumption with the handgrip exercise in the forearm. The measured results show that the scattering factor contains the artifact at the surface and the blood flow in the artery and the vein in the same phase. The artifact and the blood flow in the same phase are reduced from the oxygenated and the deoxygenated hemoglobin densities. Thus our proposed method is effective for reducing the influence of the artifact and the blood flow in the same phase from the oxygen consumption measurement. Further, it is shown that the oxygen consumption is measured more accurately by subtracting the blood flow measured by the reference detector.
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K. Fukuda, K. Fukuda, Y. Fukawa, Y. Fukawa, } "Measurement of oxygen consumption during muscle flaccidity exercise by near-infrared spectroscopy", Proc. SPIE 8578, Optical Tomography and Spectroscopy of Tissue X, 85781I (25 March 2013); doi: 10.1117/12.2002073; https://doi.org/10.1117/12.2002073
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