title: Oscillation in O2 uptake in impulse exercise.
abstract: The purpose of the present study was to examine 1) whether O(2) uptake (VO(2)) oscillates during light exercise and 2) whether the oscillation is enhanced after impulse exercise. After resting for 1 min on a bicycle seat, subjects performed 5-min pre-exercise with 25 watts work load, 10-s impulse exercise with 200 watts work load and 15-min post exercise with 25 watts work load at 80 rpm. VO(2) during pre-exercise significantly increased during impulse exercise and suddenly decreased and re-increased until 23 s after impulse exercise. In the cross correlation between heart rate (HR) and VO(2) after impulse exercise, VO(2) strongly correlated to HR with a time delay of -4 s. Peak of power spectral density (PSD) in HR appeared at 0.0039 Hz and peak of PSD in VO(2) appeared at 0.019 Hz. The peak of the cross power spectrum between VO(2) and HR appeared at 0.0078 Hz. The results suggested that there is an oscillation in O(2) uptake during light exercise that is associated with the oscillation in O(2) consumption in active muscle. The oscillation is enhanced not only by change in O(2) consumption but also by O(2) content transported from active muscle to the lungs.
authors.affiliation: Hokkaido University Laboratory of Exercise Physiology, Faculty of Education Kita-ku, Sapporo Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yano
authors.affiliation: Hokkaido University Laboratory of Exercise Physiology, Faculty of Education Kita-ku, Sapporo Japan.
authors.forename: R
authors.initials: R
authors.lastname: Afroundeh
authors.affiliation: Hokkaido University Laboratory of Exercise Physiology, Faculty of Education Kita-ku, Sapporo Japan.
authors.forename: R
authors.initials: R
authors.lastname: Yamanaka
authors.affiliation: Hokkaido University Laboratory of Exercise Physiology, Faculty of Education Kita-ku, Sapporo Japan.
authors.forename: T
authors.initials: T
authors.lastname: Arimitsu
authors.affiliation: Hokkaido University Laboratory of Exercise Physiology, Faculty of Education Kita-ku, Sapporo Japan.
authors.forename: C S
authors.initials: CS
authors.lastname: Lian
authors.affiliation: Hokkaido University Laboratory of Exercise Physiology, Faculty of Education Kita-ku, Sapporo Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shirakawa
authors.affiliation: Hokkaido University Laboratory of Exercise Physiology, Faculty of Education Kita-ku, Sapporo Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yunoki
mesh_terms: D001642:Bicycling; D015415:Biomarkers / Q000097:blood; D015444:Exercise; D006339:Heart Rate; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008168:Lung / Q000502:physiology*; D008297:Male; D009119:Muscle Contraction; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000378:metabolism*; D009991:Oscillometry; D010101:Oxygen Consumption; D010507:Periodicity; D011659:Pulmonary Gas Exchange; D013997:Time Factors; D055815:Young Adult
chemical_list: D015415:Biomarkers; D019344:Lactic Acid
keywords: O2 consumption; O2 uptake; heart rate; impulse exercise; oscillation; power spectral density