title: Relationship between maximal oxygen uptake and oxygenation level in inactive muscle at exhaustion in incremental exercise in humans.
abstract: The aim of the present study was to determine whether the oxygenation level in an inactive muscle during an incremental exercise test, determined by near-infrared spectroscopy, influences the maximal oxygen uptake (Vo2max). The oxygenation level at the onset of incremental exercise was higher than that at rest and started to decrease at a high power output. A minimal level was observed at exhaustion during incremental exercise. Vo2 increased linearly after some delay, and the rate of increase in Vo2 was greater at a higher power output. Heart rate increased linearly after the time delay, and the rate of increase in heart rate did not change. There was a significant correlation between Vo2max and oxygenation level in inactive muscle at exhaustion (r=-0.89). We therefore concluded that the oxygenation level in inactive muscle at exhaustion during incremental exercise is associated with an individual difference in Vo2max.
authors.affiliation: Laboratory of Exercise Physiology, Graduate School of Education, Hokkaido University, Kita-11, Nishi-7, Kita-ku, Sapporo, Japan. yano@edu.hokudai.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Yano
authors.forename: M
authors.initials: M
authors.lastname: Horiuchi
authors.forename: T
authors.initials: T
authors.lastname: Yunoki
authors.forename: R
authors.initials: R
authors.lastname: Matsuura
authors.forename: H
authors.initials: H
authors.lastname: Ogata
mesh_terms: D000328:Adult; D001794:Blood Pressure; D015444:Exercise / Q000502:physiology; D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D008297:Male; D008451:Maximal Voluntary Ventilation; D018482:Muscle, Skeletal / Q000378:metabolism*; D010100:Oxygen / Q000032:analysis / Q000378:metabolism*; D010101:Oxygen Consumption; D005082:Physical Exertion / Q000502:physiology*; D019265:Spectroscopy, Near-Infrared
chemical_list: D010100:Oxygen