Muscle Oxygenation
Muscle Oxygenation - Related Videos
08:58
Cerebral Blood Oxygenation Measurement Based on Oxygen-dependent Quenching of Phosphorescence
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Cited by 28 •
2011
We present an experimental procedure for measuring the partial pressure of oxygen (pO2) in cerebral vasculature based on oxygen-dependent quenching of phosphorescence. Animal preparation and imaging procedures were outlined for both large field of view CCD-based imaging of pO2 in rats and 2-photon excitation based imaging of pO2 in mice.
09:08
Detecting Reactive Oxygen Species
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2023
Reactive oxygen species are chemically active, oxygen-derived molecules capable of oxidizing other molecules. Because of their reactive nature, there are many deleterious effects associated with unchecked ROS production, including structural damage to DNA and other biological molecules. However, ROS can also be mediators of physiological signaling. There is accumulating evidence that ROS play significant roles in everything from activation of transcription factors to the mediation of...
14:02
Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
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Cited by 53 •
2012
We describe a method to directly measure muscle force, muscle power, contractile kinetics and fatigability of isolated skeletal muscles in an in vitro system using field stimulation. Valuable information on Ca2+ handling properties and contractile machinery of the muscle can be obtained using different stimulating protocols.
14:36
Evaluation of Muscle Function of the Extensor Digitorum Longus Muscle Ex vivo and Tibialis Anterior Muscle In situ in Mice
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Cited by 75 •
2013
Changes in limb muscle contractile and passive mechanical properties are important biomarkers for muscle diseases. This manuscript describes physiological assays to measure these properties in the murine extensor digitorum longus and tibialis anterior muscles.
09:38
Dissolved Oxygen in Surface Water
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University Dissolved oxygen (DO) measurements calculate the amount of gaseous oxygen dissolved in surface water, which is important to all oxygen-breathing life in river ecosystems, including fish species preferred for human consumption (e.g. bluegill and bass), as well as decomposer species critical to the recycling of biogeochemical materials in the system. The oxygen dissolved in lakes, rivers, and oceans is crucial for the...
FAQs
As exercise intensity rises, skeletal muscle requires more aerobic ATP production, so oxygen delivery and mitochondrial use must increase together. Muscle oxygenation therefore reflects the changing balance between oxygenated blood reaching the tissue and oxygen extracted during contraction. At higher intensities or during fatigue, alterations in this balance can indicate that metabolic demand is changing faster than circulatory support.
Oxygenated hemoglobin represents oxygen supplied through the muscle’s blood flow, whereas deoxygenated hemoglobin reflects oxygen extraction by active tissue. Mitochondria use that extracted oxygen to support aerobic ATP production. Considering these components together helps distinguish changes in oxygen supply from changes in tissue utilization, which is important when interpreting muscle responses during rest and activity.
Muscle performance depends on matching oxygen delivery with the tissue’s metabolic demand. If blood flow does not adequately support activity, or if oxygen use changes during fatigue, the measured balance can shift. This relationship provides insight into cardiovascular and peripheral vascular function because skeletal muscle responses reveal how effectively circulation supports increased metabolic requirements.
Near-infrared spectroscopy assesses muscle oxygenation by directing near-infrared light into skeletal muscle and tracking how tissue absorption changes. Oxygenated and deoxygenated hemoglobin absorb light differently, allowing the technique to follow their relative changes during rest or activity. The resulting measurements provide a noninvasive view of changing oxygen conditions within the measured muscle.
Muscle oxygenation measurements can support evaluation of cardiovascular function, peripheral vascular function, and exercise capacity. Because the signal reflects changing oxygen delivery and use in skeletal muscle, clinicians and researchers can examine how tissue responds to activity. These data may also help characterize disorders that impair tissue perfusion, while adding functional information beyond exercise performance alone.
During rehabilitation or exercise testing, muscle oxygenation measurements can show how tissue responds as activity changes. Researchers can relate these responses to exercise capacity and to the adequacy of circulatory support for working muscle. This makes the technique useful for studying recovery and functional limitation in settings where cardiovascular or peripheral vascular impairment may affect physical performance.