2026-03-06T23:50:00Z https://kurume.repo.nii.ac.jp/oai

oai:kurume.repo.nii.ac.jp:00000335 2023-06-19T08:11:53Z 12:13:62

高強度自転車運動時の筋酸素化レベルと 肺胞レベルの酸素摂取量の動態 Kinetics of Muscle Deoxygenation and Pulmonary O2 Uptake during Heavy-Intensity Cycle Exercise 00239211 右田, 孝志 ミギタ, タカシ Migita, Takashi near-infrared spectroscopy time constant slow component oxygen extraction The near-infrared spectroscopy (NIRS) signal (deoxyhemoglobin concentration;[HHb]) reflects the dynamic balance between oxygen consumption and delivery during microcirculation. The aim of the present study was to estimate the kinetics of [HHb] during exercise and compare it with the kinetics of pulmonary oxygen uptake ( ・VO2p). Seven male distance runners performed a heavy-intensity， constant work rate cycle exercise. [HHb] and ・VO2p were measured during exercise， and the kinetics of both the variables was analyzed using a mono- or double-nonlinear regression model. [HHb] derived from NIRS remained at resting levels for a period of 11.0 ± 3.2 s after an increase in the work rate. After the time delay， [HHb] rapidly increased with a time constant of 10.9 ± 3.2 s for the primary component; the increase was significantly faster than that of ・VO2p (23.8 ± 7.6 s， P < 0.05). The kinetic of [HHb] during the later phase of exercise (slow component phase) was different from that of ・VO2p and showed various patterns between individuals. These results suggest that local muscle O2 delivery and utilization were balanced during microcirculation for the first period after the onset of exercise (approximately 10 s)， however， the rate of adjustment of O2 delivery and utilization did not match during subsequent phases (primary and slow component phases). 久留米大学健康・スポーツ科学センター 2016-12-01 jpn departmental bulletin paper http://hdl.handle.net/11316/603 https://kurume.repo.nii.ac.jp/records/335 1346-3055 AA11507881 久留米大学健康・スポーツ科学センター研究紀要 Kurume journal of health and sports science 23 1 10 https://kurume.repo.nii.ac.jp/record/335/files/kenspo23_1-10.pdf application/pdf 946.7 kB 2018-02-20