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

Usuda Noboru; Shirakawa Kazuki; Hatano Kei; Abe Masaki O.; Yunoki Takahiro; Yano Tokuo

Title	en Coherence between oscillations in the cardiorespiratory system and tissue oxygen index in muscle recovering from intensive exercise in humans
Alternative	en Coherence between cardiorespiratory system and TOI
Creator	en Usuda, Noboru en Shirakawa, Kazuki en Hatano, Kei en Abe, Masaki O. NRID 1000040392196 en Yunoki, Takahiro NRID 1000000352500 en Yano, Tokuo NRID 1000080200559
Accessrights	open access
Rights	en The archived file is not the final published version of the paper.
Subject	Other en Coherence Other en Cardiorespiratory system Other en Tissue oxygen index Other en Oscillation Other en Recovery from exercise NDC 491
Description	Abstract en 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.
Publisher	hu Akadémiai Kiadó
Date	Issued2019-09
Language	eng
Resource Type	journal article
Version Type	AM
Identifier	HDL http://hdl.handle.net/2115/75786
Relation	isVersionOf DOI https://doi.org/10.1556/2060.106.2019.25 PMID 31602997
Journal	PISSN 2498-602X NCID AA10637167 en Physiology International Volume Number106 Issue Number3 Page Start261 Page End271
File	fulltext Accept-PI.pdf 793.81 KB (application/pdf) Issued2019-09
Oaidate	2023-07-26