Association between regional quadriceps oxygenation and blood oxygen saturation during normoxic one-legged dynamic knee extension
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It is not clear whether muscle oxygenation (O2-NIRS) measured by near-infrared spectroscopy (NIRS) correlates with femoral venous SO2 (Sfvo2) during normoxic exercise. Therefore, the purpose of this study was to compare physiologically calibrated O2-NIRS with Sfvo2 in subjects performing one-legged dynamic knee extension exercise (1L-KEE). Five healthy male subjects (age 25±2 year, height 177.8±4.8 cm, body weight 67.1 ± 5.0 kg; mean ± SD) performed 1L-KEE at 20, 40, and 60% of peak work rate (WR-peak) each for 4 min. Sfvo2 was measured at rest and during the 3rd minute of each work rate. O2-NIRS was continuously monitored in a proximal region of the vastus lateralis (VL-p), a distal region of VL (VL-d), and a proximal region of the rectus femoris (RF-p). Sfvo2 was 56.0% at rest and decreased to 36.6 at 20% WR-peak, 35.8 at 40% WR-peak, and 31.1 at 60% WR-peak. There was a significant correlation between O2-NIRS and Sfvo2(VL-p: r2 = 0.62, VL-d: r2 = 0.35, RF-p: r2 = 0.62, with a moderate variation among individuals at each site; residual values = 4.83 – 11.75). These data indicate that NIRS measurement provides a reflection of Sfvo2 during 20–60% WR-peak of normoxic 1L-KEE.
KeywordsNear-infrared spectroscopy Muscle oxygenation level Venous blood oxygen saturation
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