Final answer:
The breath type in question refers to forced breathing, or hyperpnea, which involves muscle contractions for both inhalation and exhalation, particularly during activities like exercise or deliberate breathing control as in singing.
Step-by-step explanation:
The type of breath described where flow is delivered to elevate circuit pressure to the pressure support setting is known as forced breathing or hyperpnea. This breathing mode occurs during exercise or through intentional manipulation of breath like in singing. During forced breathing, muscle contractions are responsible for both inspiration and expiration.
Accessory muscles, beyond the diaphragm and intercostal muscles, contract to aid the breathing process. When engaging in forced inspiration, neck muscles such as the scalenes lift the thoracic wall, which increases lung volume. Conversely, during forced expiration, abdominal muscles, including obliques, contract to push against the diaphragm, which forces more air out. Internal intercostals are also involved to help compress the rib cage and lower the volume of the thoracic cavity.