title: Oscillation of tissue oxygen index in non-exercising muscle during exercise.
abstract: The purpose of the present study was to examine how oscillation of tissue oxygen index (TOI) in non-exercising exercise is affected during high-intensity and low-intensity exercises. Three exercises were performed with exercise intensities of 30% and 70% peak oxygen uptake (Vo(2)peak) for 12 min and with exercise intensity of 70% Vo(2)peak for 30 s. TOI in non-exercising muscle (biceps brachii) during the exercises for 12 min was determined by nearinfrared spectroscopy. TOI in the non-exercising muscle during the exercises was analyzed by fast Fourier transform (FFT) to obtain power spectra density (PSD). The frequency at which maximal PSD appeared (Fmax) during the exercise with 70% Vo(2)peak for 12 min (0.00477 ± 0.00172 Hz) was significantly lower than that during the exercise with 30% Vo2peak for 12 min (0.00781 ± 0.00338 Hz). There were significant differences in blood pH and blood lactate between the exercise with 70% Vo(2)peak and the exercise with 30% Vo(2)peak. It is concluded that TOI in nonexercising muscle oscillates during low-intensity exercise as well as during high-intensity exercise and that the difference in Fmax between the two exercises is associated with the difference in increase in blood lactate derived from the exercise.
authors.affiliation: Department of Human Developmental Sciences, Faculty of Education Hokkaido University , Kita-ku , Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yano
authors.affiliation: Department of Sport Science and Physical Education, Payame Noor University , Tehran , Iran.
authors.forename: R
authors.initials: R
authors.lastname: Afroundeh
authors.affiliation: Graduate School of Education, Hokkaido University , Kita-ku , Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shirakawa
authors.affiliation: Graduate School of Education, Hokkaido University , Kita-ku , Japan.
authors.forename: C-S
authors.initials: CS
authors.lastname: Lian
authors.affiliation: Graduate School of Education, Hokkaido University , Kita-ku , Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shibata
authors.affiliation: Graduate School of Education, Hokkaido University , Kita-ku , Japan.
authors.forename: Z
authors.initials: Z
authors.lastname: Xiao
authors.affiliation: Department of Human Developmental Sciences, Faculty of Education Hokkaido University , Kita-ku , Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yunoki
mesh_terms: D015415:Biomarkers / Q000097:blood; D015444:Exercise; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D019344:Lactic Acid / Q000097:blood; D008297:Male; D009119:Muscle Contraction; D018482:Muscle, Skeletal / Q000378:metabolism*; D009991:Oscillometry; D010100:Oxygen / Q000097:blood*; D010101:Oxygen Consumption; D017550:Spectroscopy, Fourier Transform Infrared; D019265:Spectroscopy, Near-Infrared; D055815:Young Adult
chemical_list: D015415:Biomarkers; D019344:Lactic Acid; D010100:Oxygen
keywords: blood lactate; fast Fourier transform; non-exercising muscle; power spectra density; tissue oxygen index