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Related Concept Videos

Pulse Oximetry01:24

Pulse Oximetry

Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
Guidelines For Measuring Vital Signs01:19

Guidelines For Measuring Vital Signs

Following these guidelines can help nurses accurately measure vital signs, assess changes in patient conditions, and provide timely treatment when necessary. Adhering closely to the guidelines ensures the accuracy and reliability of the results.
Before taking a patient's vital signs, a nurse would consider and assess the patient's comfort level and ensure appropriate equipment is available.
Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is important. 

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Related Experiment Video

Updated: May 14, 2026

Skeletal Muscle Neurovascular Coupling, Oxidative Capacity, and Microvascular Function with 'One Stop Shop' Near-infrared Spectroscopy
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Skeletal Muscle Neurovascular Coupling, Oxidative Capacity, and Microvascular Function with 'One Stop Shop' Near-infrared Spectroscopy

Published on: February 20, 2018

Noncontrast skeletal muscle oximetry.

Jie Zheng1, Hongyu An, Andrew R Coggan

  • 1Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, Missouri, USA.

Magnetic Resonance in Medicine
|February 21, 2013
PubMed
Summary

This study introduces a novel noncontrast MRI method to measure skeletal muscle oxygenation. The technique successfully quantified muscle oxygen consumption during exercise in healthy volunteers.

Keywords:
arterial spin labelingcardiovascular magnetic resonanceoxygen consumptionoxygen extraction fractionskeletal muscle

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Area of Science:

  • Biomedical Engineering
  • Radiology
  • Physiology

Background:

  • Accurate quantification of skeletal muscle oxygenation is crucial for understanding physiological states and diseases.
  • Existing methods for measuring muscle oxygenation often require contrast agents or are indirect.

Purpose of the Study:

  • To develop and validate a new noncontrast magnetic resonance (MR) oximetry technique for direct regional skeletal muscle oxygenation quantification.
  • To assess the feasibility of this novel method in healthy human subjects.

Main Methods:

  • Utilized a 3 Tesla clinical MRI scanner to examine five healthy volunteers.
  • Employed arterial spin labeling for muscle perfusion measurement and a susceptibility-based MRI technique for oxygen extraction fraction.
  • Measurements were taken at rest and during sustained isometric calf muscle contraction.

Main Results:

  • Demonstrated a significant increase in soleus muscle perfusion from rest (6.5 ± 2.0 mL/100g/min) to exercise (47.9 ± 7.7 mL/100g/min).
  • Observed a significant increase in soleus muscle oxygen consumption rate from 0.43 ± 0.13 to 4.2 ± 1.5 mL/100g/min.
  • Similar significant increases in perfusion and oxygen consumption were noted in the gastrocnemius muscle.

Conclusions:

  • This represents the first MR oximetry method developed for direct quantification of regional skeletal muscle oxygenation.
  • The noncontrast technique shows promise for applications in cardiology, gerontology, kinesiology, and physical therapy.
  • This method offers a valuable tool for assessing muscle metabolism and oxygenation in various clinical and research settings.