This is because, the exhaled carbon dioxide (CO2)
during breathing does not escape and is more concentrated in the bedding material
Usually left
open during breathing, partially closing the glottis prevents sound from escaping into the lungs and enhances reflection of sound from the vocal cords.
In fact, those treatments are already showing promise in the dogs, improving leg strength and diaphragm
function during breathing, paving the way for clinical trials in humans.
Current testing requires a series of methods including a spirometry test, which measures the amount (volume) and the speed (flow) of
air during breathing, followed by a body plethysmography test measuring static lung volumes and airways resistance and finally a diffusion test, which measures the amount of oxygen and other gases that cross the lungs» air sacs.
Spirometry, a test that measures
airflow during breathing, does not demonstrate a pattern consistent with asthma or COPD.
It could also be an abdominal issue, as those muscles will naturally become inhibited when the diaphragm
contracts during breathing / singing.
Instead, it relies on a type of peristalsis that is stimulated by a combination of skeletal movement and pressure changes in the
thorax during breathing.
This is why if you watch these patients closely you will see them using their abdominal muscles as
bellows during breathing.
Gastro - intestinal disease is also common because of altered pressures in the chest and
abdomen during breathing that can cause acid reflux and even herniation of the stomach into the chest cavity.
It contains cartilage flaps that operate like saloon doors - opening
wide during breathing and closing during swallowing.
The clinical signs are changes in the voice, laryngeal stridor (harsh
noise during breathing), and a dry cough.
TreeHugger and Instructables teamed up to make a working chest charger which relies only on the rise and fall of the
chest during breathing.
In dogs with an elongated soft palate, the palate overlaps the epiglottis to a considerable degree, partially obstructing the animal's
airway during breathing.
Athletes typically go into thoracic hyper extension to utilise the accessory respiratory muscles (intercostals, sternocleidomastoids etc.) to make up for their lack of ability to properly use the diaphragm
during breathing.
During breathing, the serratus anterior also assists in chest expansion.