Measurement of oxygen consumption during muscle flaccidity exercise by near-infrared spectroscopy
Measurement of oxygen consumption during muscle flaccidity exercise by near-infrared spectroscopy
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DOI：
10.1117/12.2002073
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
K. Fukuda;Y. Fukawa
中科院分区：
文献类型：
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作者：
K. Fukuda;Y. Fukawa
定量测量肌肉的耗氧量对于评估运动效果很重要。近红外光谱 (NIRS) 是一种测量肌肉氧合的无创方法。然而，测量结果会受到血压变化引起的血容量变化的影响。为了评估血容量的变化并提高测量精度，我们提出了考虑散射因子的三波长测量的计算方法和监测血流的测量，以更精确地测量氧浓度的时间变化。我们采用三波长光源（680nm、808nm和830nm）进行连续波测量。两个探测器（目标探测器和参考探测器）放置在目标肌肉附近并与其分开。我们通过前臂的握力运动控制血管内压力和耗氧量来测量血流量。测量结果表明，散射因子包含表面伪影以及动脉和静脉内的血流同相。同一阶段的伪影和血流因含氧和脱氧血红蛋白密度而减少。因此，我们提出的方法可有效减少伪影和同一阶段血流对耗氧量测量的影响。此外，表明通过减去参考检测器测量的血流量可以更准确地测量耗氧量。
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.