title: Reproducibility of muscle oxygen saturation.
abstract: The present study evaluated the reproducibility of tissue oxygenation in relation to oxygen consumption (VO2) across cycle exercise intensities in a test-retest design. 12 subjects (25.7±2.1 years; 24.7±1.9 kg · m(-2)) twice performed an incremental bicycle exercise protocol, while tissue oxygen saturation (StO2) in the vastus lateralis muscle was monitored by a commercially available NIRS unit and VO2 determined by an open-circuit indirect calorimetric system. Coefficients of variation across rest, workloads corresponding to 25, 50 and 75% of individual maximum capacity, and maximum load were 5.8, 4.6, 6.1, 8.0, 11.0% (StO2) and 7.6, 6.0, 3.7, 3.4, 3.1% (VO2), respectively. 95 % CI of relative test-retest differences ranged from -5.6 to +5.4% at 25% load to -17.2 to +7.5% at maximum load for StO2 and from -7.3 to +7.7% at rest to -3.3 to +3.2% at maximum load for VO2. With advancing exercise intensity, within-subject variability of StO2 was augmented, whereas VO2 variability slightly attenuated. NIRS measurements at higher workloads need to be interpreted with caution.
authors.affiliation: Goethe University, Sports Medicine, Frankfurt, Germany. c.thiel@sport.uni-frankfurt.de
authors.forename: C
authors.initials: C
authors.lastname: Thiel
authors.forename: L
authors.initials: L
authors.lastname: Vogt
authors.forename: H
authors.initials: H
authors.lastname: Himmelreich
authors.forename: M
authors.initials: M
authors.lastname: Hübscher
authors.forename: W
authors.initials: W
authors.lastname: Banzer
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology*; D002153:Calorimetry, Indirect / Q000379:methods; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D010100:Oxygen / Q000378:metabolism; D010101:Oxygen Consumption / Q000502:physiology*; D015203:Reproducibility of Results; D019265:Spectroscopy, Near-Infrared / Q000379:methods*; D055815:Young Adult
chemical_list: D010100:Oxygen