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Related Concept Videos

Exercise Stress Test01:26

Exercise Stress Test

350
Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
350
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
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Exercise and Cardiovascular Response01:20

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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
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Correlation between ECG and Cardiac Cycle01:25

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be...
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Pulmonary Function Tests01:25

Pulmonary Function Tests

416
Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
PFTs involve using a spirometer, a...
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Related Experiment Video

Updated: Aug 17, 2025

Using Near-Infrared Spectroscopy Wearable Devices to Identify Central Versus Peripheral Limitations During Exercise
09:33

Using Near-Infrared Spectroscopy Wearable Devices to Identify Central Versus Peripheral Limitations During Exercise

Published on: December 19, 2024

946

Perceived Exertion Correlates with Multiple Physiological Parameters During Cardiopulmonary Exercise Testing.

Shinichiro Morishita1,2,3, Atsuhiro Tsubaki2,3, Kazuki Hotta2,3

  • 1Department of Physical Therapy, School of Health Science, Fukushima Medical University, Fukushima, Japan.

Advances in Experimental Medicine and Biology
|December 17, 2022
PubMed
Summary

The Borg scale effectively estimates perceived exertion and fatigue during supine exercise. Leg muscle oxygenation levels correlate with work rate, similar to upright exercise findings.

Keywords:
Borg scale scoreFatigueLeg muscle hemoglobin oxygenationNIRS

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Area of Science:

  • Exercise Physiology
  • Biomedical Engineering

Background:

  • Cardiopulmonary exercise testing (CPET) assesses physiological responses to exercise.
  • Near-infrared spectroscopy (NIRS) non-invasively measures muscle oxygenation.
  • Understanding the relationship between subjective exertion and objective physiological measures is crucial.

Purpose of the Study:

  • To investigate the correlation between the Borg scale score and leg muscle oxygenation (O2Hb, HHb) measured by NIRS.
  • To examine the relationship of the Borg scale score with work rate, heart rate (HR), oxygen uptake (VO2), and minute ventilation (VE) during supine CPET.
  • To explore the association between leg muscle oxygenation and work rate during supine CPET.

Main Methods:

  • Fifteen healthy adult males underwent supine cardiopulmonary exercise testing (CPET).
  • Near-infrared spectroscopy (NIRS) monitored leg muscle oxygenated haemoglobin (O2Hb) and deoxygenated haemoglobin (HHb) levels.
  • Data on Borg scale score, work rate, HR, VO2, and VE were collected minute-by-minute and at test completion.

Main Results:

  • Borg scale scores significantly correlated with work rate, HR, VO2, and VE (r=0.86-0.94, p<0.05).
  • Borg scale scores also correlated significantly with leg muscle O2Hb (r=-0.6, p<0.05) and HHb (r=0.8, p<0.05).
  • Leg muscle O2Hb and HHb levels showed significant correlations with work rate (r=-0.62 and 0.8, p<0.05, respectively).

Conclusions:

  • The Borg scale score can effectively indicate rating of perceived exertion, whole-body, and local muscle fatigue during supine exercise.
  • Leg muscle oxygenation is demonstrably linked to work rate in supine exercise.
  • Findings suggest consistency between supine and upright exercise responses regarding muscle oxygenation and work rate.