BCIA Breathing & Capnometry Biofeedback

Question 1

What does end-tidal CO2 (EtCO2) measure in capnometry biofeedback?

Accepted Answer

Carbon dioxide concentration at the end of exhalation

Answer

End-tidal CO2 measures the concentration of carbon dioxide at the end of a complete exhalation, closely approximating alveolar and arterial CO2 levels.

Question 2

What is the normal range for end-tidal CO2 (EtCO2) in healthy resting adults?

Accepted Answer

35–45 mmHg

Answer

Normal EtCO2 in healthy resting adults ranges from 35–45 mmHg, reflecting adequate alveolar ventilation matched to metabolic demand.

Question 3

What term describes chronically low CO2 levels caused by over-breathing?

Accepted Answer

Hypocapnia

Answer

Hypocapnia refers to abnormally low arterial CO2, which occurs when breathing rate and depth exceed metabolic CO2 production, as in hyperventilation.

Question 4

At approximately what breathing rate does resonance frequency breathing typically occur to maximize HRV?

Accepted Answer

6 breaths per minute

Answer

Resonance frequency breathing occurs near 6 breaths per minute (~0.1 Hz), which entrains the baroreflex and maximizes heart rate variability oscillations.

Question 5

Which breathing pattern is emphasized in biofeedback training to maximize ventilation efficiency and reduce muscle tension?

Accepted Answer

Diaphragmatic breathing

Answer

Diaphragmatic breathing engages the primary respiratory muscle and is more efficient than thoracic breathing, improving gas exchange and reducing accessory muscle tension.

BCIA - Biofeedback Certification International Alliance Practice Test

BCIA - Biofeedback Certification International Alliance Practice Test

BCIA Breathing & Capnometry Biofeedback