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Coherence between cardiorespiratory system and TOI
- Source :
- Physiology International. 106:261-271
- Publication Year :
- 2019
- Publisher :
- Akademiai Kiado Zrt., 2019.
-
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.
- Subjects :
- Adult
Male
0301 basic medicine
Quadriceps Muscle
Cardiorespiratory system
Young Adult
03 medical and health sciences
Oxygen Consumption
Recovery from exercise
0302 clinical medicine
Nuclear magnetic resonance
Heart Rate
Tissue oxygen index
Physiology (medical)
Humans
Tissue oxygen
Muscle, Skeletal
Exercise
Lung
Physics
Oscillation
Heart
Cardiorespiratory fitness
Coherence (statistics)
Oxygen
030104 developmental biology
Exercise Test
Blood Gas Analysis
Coherence
030217 neurology & neurosurgery
Muscle Contraction
Subjects
Details
- ISSN :
- 2498602X
- Volume :
- 106
- Database :
- OpenAIRE
- Journal :
- Physiology International
- Accession number :
- edsair.doi.dedup.....ef2806da2ee671077b17441778ad3f55