title: Muscle oxygen saturation heterogeneity among leg muscles during ramp exercise.
abstract: We examined whether O(2) saturation in several leg muscles changes as exercise intensity increases. Twelve healthy young males performed 20 W/min ramp bicycle exercise until exhaustion. Pulmonary O(2) uptake (VO(2)) was monitored continuously during the experiments to determine peak oxygen uptake. Muscle O(2) saturation (SmO(2)) was also monitored continuously at the belly of the vastus lateralis (VL), rectus femoris, vastus medialis, biceps femoris, gastrocnemius lateralis, gastrocnemius medialis, and tibialis anterior by near-infrared spatial resolved spectroscopy. Although the VL muscle mainly contributes during cycling exercise, deoxygenation was enhanced not only in the VL muscle but also in the other thigh muscles and lower leg muscles with increased exercise intensity. Furthermore, SmO(2) response during ramp cycling exercise differed considerably between leg muscles.
authors.affiliation: Department of Sports Medicine for Health Promotion, Tokyo Medical University, 6-1-1 Shinjuku, Shunjuku-ku, Tokyo, 160-8402, Japan. stakagi@tokyo-med.ac.jp.
authors.forename: Shun
authors.initials: S
authors.lastname: Takagi
authors.affiliation: Department of Sports Medicine for Health Promotion, Tokyo Medical University, 6-1-1 Shinjuku, Shunjuku-ku, Tokyo, 160-8402, Japan.
authors.forename: Ryotaro
authors.initials: R
authors.lastname: Kime
authors.affiliation: Department of Electrical and Electronic Engineering, Shizuoka University, Shizuoka, 432-8561, Japan.
authors.forename: Masatsugu
authors.initials: M
authors.lastname: Niwayama
authors.affiliation: Department of Sports Medicine for Health Promotion, Tokyo Medical University, 6-1-1 Shinjuku, Shunjuku-ku, Tokyo, 160-8402, Japan.
authors.forename: Norio
authors.initials: N
authors.lastname: Murase
authors.affiliation: Department of Sports Medicine for Health Promotion, Tokyo Medical University, 6-1-1 Shinjuku, Shunjuku-ku, Tokyo, 160-8402, Japan.
authors.forename: Toshihito
authors.initials: T
authors.lastname: Katsumura
mesh_terms: D000328:Adult; D001107:Architectural Accessibility; D015444:Exercise / Q000502:physiology*; D006801:Humans; D007866:Leg / Q000098:blood supply*; D008297:Male; D018482:Muscle, Skeletal / Q000098:blood supply* / Q000502:physiology*; D010100:Oxygen / Q000378:metabolism*; D010101:Oxygen Consumption; D019265:Spectroscopy, Near-Infrared; D055815:Young Adult
chemical_list: D010100:Oxygen