Deep Breathing Test
Deep Breathing Test - Related Videos
08:34
Investigation into Deep Breathing through Measurement of Ventilatory Parameters and Observation of Breathing Patterns
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Cited by 3 •
2019
Here, we present a protocol to assess two deep breathing patterns of natural and diaphragmatic breathing for their effectiveness and ease of execution. Fifteen participants were selected, utilizing an electrocardiograph and expired gas analyzer for measurement of the ventilatory parameters, together with visual assessment by video capture of thoracoabdominal movement.
01:05
Breathing
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2019
The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
06:27
Fast and Accurate Exhaled Breath Ammonia Measurement
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Cited by 16 •
2014
Ammonia is an important physiologic metabolite relevant to various disease and wellness states. It is also a difficult molecule to measure in breath, which demands particular precautions be taken to obtain accurate results. Not all factors influencing ammonia are known, but progress can be difficult without accounting for these factors.
11:34
Breathing-controlled Electrical Stimulation (BreEStim) for Management of Neuropathic Pain and Spasticity
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Cited by 9 •
2013
The purpose is to present a new method, breathing-control electrical stimulation (BreEStim) for management of neuropathic pain and spasticity.
11:38
Voluntary Breath-hold Technique for Reducing Heart Dose in Left Breast Radiotherapy
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Cited by 49 •
2014
The current priority in breast cancer radiotherapy is to reduce cardiac doses without compromising target tissue coverage. The voluntary breath-hold technique described here is a simple, inexpensive solution to this problem and capable of being instituted widely without the need for specialized equipment.
FAQs
During the test, inhalation and exhalation create a repeated respiratory challenge to cardiovascular control. Heart rate normally accelerates as the subject inhales and decelerates during exhalation, producing respiratory sinus arrhythmia. The magnitude and consistency of this alternating response are important because they reflect how effectively parasympathetic, or vagal, input modulates cardiac timing during changing respiratory phases.
The key readout is the heart-rate difference between the breathing phases or a related measure of heart-rate variability. A larger phase-related fluctuation indicates greater expression of cardiac vagal modulation in that recording, whereas a reduced fluctuation suggests a weaker parasympathetic response. This interpretation concerns autonomic regulation specifically, rather than serving as a complete measure of cardiovascular function.
Pharmacological studies can use the response as a functional marker of drug-related autonomic effects. If a compound changes the size of the breathing-linked heart-rate response, investigators can examine whether treatment alters cardiac vagal control or broader cardiovascular reflexes. Comparing results before and after treatment helps characterize change, while interpretation should account for other physiological measurements rather than isolating the test result.
An assessment follows repeated, controlled cycles of deep inspiration and expiration while heart rate is recorded. The investigator then compares the rate during inhalation with the rate during exhalation and calculates the phase-related difference or resulting variability. Because the signal depends on the breathing pattern, maintaining the prescribed paced cycle is central to obtaining a response that can be interpreted as an autonomic measure.
In pharmacology, the test is useful when a study needs a noninvasive indicator of treatment-related autonomic change. It can characterize how drugs influence parasympathetic cardiovascular regulation and can be used to assess whether treatment is associated with altered cardiovascular reflexes. This makes the measurement relevant to drug-effect studies and to investigations of autonomic dysfunction, without requiring an invasive autonomic assessment.
Results are most informative when integrated with other physiological measurements. A reduced or altered breathing-linked response may point to changed parasympathetic regulation, but it can also occur alongside broader cardiovascular abnormalities. Combining the test with additional measures helps investigators distinguish a predominantly vagal change from a more general cardiovascular disturbance and strengthens interpretation of drug- or disease-related findings.