Measurement of Dynamic Change in Muscle Oxygenation Using Near-infrared Spectroscopy
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概要
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Near-infrared spectroscopy (LAIRS) is a noninvasive and simple technique for continuous measurement of tissue oxygenation of the brain and skeletal muscles. In this review paper, theoretical background of NIRS and difficulties to be overcome for practical applications are described. The presence of overlying tissues such as the skull and subcutaneous fat layer above the target tissues greatly affects the measurement sensitivity of NIRS. This is one of the most important factors to quantitatively determine the tissue oxygenation. We have investigated the influence of a fat layer on muscle oxygenation measurement and suggested a method for correcting this influence. Typical applications of our correction method are presented: 1) significant difference in reoxygenation rate immediately after exercise between top athletes and normal young adults, and significant increase in reoxygenation rate due to high-altitude training in top athletes; 2) estimation of local and instantaneous oxygen consumption during exercise; and 3) functional imaging of muscle oxygenation for spatio-temporal analyses of muscle metabolism and heterogeneity of muscle function. Despite great effects of many factors on measurements, only NIRS gives us a simple, noninvasive and continuous monitoring technique of tissue oxygenation. Results of our studies suggest that NIRS using an appropriate correction method is quantitative within acceptable accuracy and useful for physiological studies and clinical applications.
- 日本顎口腔機能学会の論文
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