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Coherence between oscillations in the cardiorespiratory system and tissue oxygen index in muscle recovering from intensive exercise in humans

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Title: Coherence between oscillations in the cardiorespiratory system and tissue oxygen index in muscle recovering from intensive exercise in humans
Authors: Usuda, Noboru Browse this author
Shirakawa, Kazuki Browse this author
Hatano, Kei Browse this author
Abe, Masaki O. Browse this author →KAKEN DB
Yunoki, Takahiro Browse this author →KAKEN DB
Yano, Tokuo Browse this author →KAKEN DB
Keywords: Coherence
Cardiorespiratory system
Tissue oxygen index
Oscillation
Recovery from exercise
Issue Date: Sep-2019
Publisher: Akadémiai Kiadó
Journal Title: Physiology International
Volume: 106
Issue: 3
Start Page: 261
End Page: 271
Publisher DOI: 10.1556/2060.106.2019.25
PMID: 31602997
Abstract: It has been shown that the tissue oxygen index (TOI) measured by near-infrared spectroscopy oscillates at very low frequencies during recovery after exercise and that this oscillation is derived from interactions among biochemical substances involved in oxidative metabolism in skeletal muscle. As a further step, we examined whether TOI in muscle interacts through oscillation with factors related to oxygen in the cardiorespiratory system. For this examination, coherence and phase difference between the TOI in the vastus lateralis and heart rate (HR) and between TOI and arterial oxygen saturation (SpO2) were sequentially determined during recovery (2–60 min) after severe cycle exercise with a workload of 7.5% of body weight for 20 s. Significant coherence between TOI and HR was obtained in the very low-frequency band (approximate range: 0.002–0.03 Hz) and in the low-frequency band (approximate range: 0.06–0.12 Hz). The phase difference was negative in the low-frequency band and positive in the very low-frequency band. The coherence between TOI and SpO2 was significant in the very low-frequency band. The phase difference was negative. There were no sequential changes in these coherences and phase differences. The results suggest that TOI in skeletal muscle interrelates with factors related to the heart and lungs.
Rights: The archived file is not the final published version of the paper.
Type: article (author version)
URI: http://hdl.handle.net/2115/75786
Appears in Collections:教育学院・教育学研究院 (Graduate School of Education / Faculty of Education) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 矢野 徳郎

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