title: Association between regional quadriceps oxygenation and blood oxygen saturation during normoxic one-legged dynamic knee extension.
abstract: It is not clear whether muscle oxygenation (O(2-NIRS)) measured by near-infrared spectroscopy (NIRS) correlates with femoral venous SO2 (S(fv)o2) during normoxic exercise. Therefore, the purpose of this study was to compare physiologically calibrated O(2-NIRS) with S(fv)o2 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. S(fv)o2 was measured at rest and during the 3rd minute of each work rate. O(2-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). S(fv)o2 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 O(2-NIRS) and S(fv)o2(VL-p: r (2) = 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 S(fv)o2 during 20-60% WR-peak of normoxic 1L-KEE.
authors.affiliation: Institute of Health and Sport Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki, 305-8574, Japan. DZH01750@nifty.com
authors.forename: Kazuki
authors.initials: K
authors.lastname: Esaki
authors.forename: Takafumi
authors.initials: T
authors.lastname: Hamaoka
authors.forename: Göran
authors.initials: G
authors.lastname: Rådegran
authors.forename: Robert
authors.initials: R
authors.lastname: Boushel
authors.forename: Jim
authors.initials: J
authors.lastname: Hansen
authors.forename: Toshihito
authors.initials: T
authors.lastname: Katsumura
authors.forename: Shukoh
authors.initials: S
authors.lastname: Haga
authors.forename: Masao
authors.initials: M
authors.lastname: Mizuno
mesh_terms: D000328:Adult; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005268:Femoral Vein / Q000502:physiology*; D006801:Humans; D007717:Knee / Q000502:physiology*; D008297:Male; D009119:Muscle Contraction; D010100:Oxygen / Q000097:blood*; D010101:Oxygen Consumption; D005082:Physical Exertion / Q000502:physiology; D052097:Quadriceps Muscle / Q000502:physiology*; D019265:Spectroscopy, Near-Infrared
chemical_list: D010100:Oxygen