漸増負荷運動における局所骨格筋の酸素化レベルの測定について

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The purpose of this study was to estimate the changes in oxygenation of skeletal muscle and lactate threshold (LT) during a cycle ergometry exercise. Six male subjects performed a ramp loaded cycling at a work rate of 20 watts/minute until exhaustion. Muscle oxygenation in the vastus lateralis was evaluated using near infrared spectroscopy (NIRS), while pulmonary oxygen uptake was measured by an expiratory gas analysis. Blood samples were obtained from the radial vein every minute during the exercise. LT was evaluated from the relationship between oxygen uptake and blood lactate concentration. Muscle oxvtenation (M02) level was defined as 100% at rest and 0% at the lowest level during femoral arterial occlusion. Initially in the exercise, MO_2 levels increased rapidly relative to resting levels, but then immediately began to decrease in a linear fashion. In five subjects, the decrease in the MO_2 level is linear until approximately 80% VO^^・2max. However, one subject remained linear to exhaustion. Minimal MO_2 level and that at LT during exercise were 67.6 (SE 6.3) % and 87.2 (SE 2.7) %, respectively. Our results indicated that a limitation of exercise occurred even though the MO_2 level was not 0%. MO_2 levels measured by NIRS indicated the balance between oxygen supply and consumption. Therefore, the decrease rate of muscle deoxygenation during the exercise intensity above 80% VO^^・2max may indicate that the oxygen supply was larger than the oxygen consumption.
日本運動生理学会の論文
1999-01-30

漸増負荷運動における局所骨格筋の酸素化レベルの測定について

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