近赤外分光法を用いた活動筋の循環動態の評価 : 自転車運動時の大腿活動筋について

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Using near-infrared spectroscopy, we monitored changes of oxygenated hemoglobin and myoglobin contents[oxy(Hb+Mb)], deoxygenated hemoglobin and myoglobin contents[deoxy (Hb+Mb)], and total hemoglobin and myoglobin contents[total(Hb+Mb)]of the thigh muscle at rest and during incremental bicycle exercise and recovery in 10 healthy male volnuteers. Gas exchange parameters were also measured in breath-by-breath mode. The following results were obtained : 1) During low-intensity exercise (216 kpm/min), oxy (Hb+Mb) increased, while deoxy (Hb+Mb) and total (Hb+Mb) decreased. These changes are thought to reflect an increase in arterial blood flow to the exercising muscle and an increase in venous return. 2) During high-intensity exercise (above 972 kpm/min), oxy (Hb+Mb) decreased, while deoxy (Hb+Mb) increased. These findings probably reflect increased O_2 extraction. 3) Upon cessation of exercise, oxy (Hb+Mb) and total (Hb+Mb) increased, and deoxy (Hb+Mb) decreased abruptly. These changes probably reflect post-exercise hyperemia with decreased O_2 extraction. 4) Oxy (Hb+Mb) level at ventilatory threshold (VT) was the same as or higher than that of resting condition, indicating that VT occurs when the level of O_2 in the vessels of the thigh muscle is relatively high. 5) Spontaneous fluctuation of oxy (Hb+Mb) with frequency of 7〜10cycles/min was observed. This fluctuation was more marked during exercise than during rest or recovery. These findings suggest that the influence of increased blood flow and venous return on oxy (Hb+Mb), deoxy (Hb+Mb) and total (Hb+Mb) are greater than that of O_2 extraction during low intensity exercise, whereas the influence of O_2 extraction increases with exercise intensity. Near-infrared spectroscopy provides valuable information with regard to O_2 transport and O_2 extraction in the exercising muscle.
日本体力医学会の論文
1992-10-01

近赤外分光法を用いた活動筋の循環動態の評価 : 自転車運動時の大腿活動筋について

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