BCIA Research & Evidence Base 2 — Questions and Answers
Question 1: HRV biofeedback has the strongest evidence base for which clinical application?
- Epilepsy
- Asthma and cardiovascular health/hypertension (Correct answer)
- Traumatic brain injury
- ADHD
Correct answer: Asthma and cardiovascular health/hypertension
HRV biofeedback has Level 4–5 evidence for reducing blood pressure and improving outcomes in asthma, cardiovascular rehabilitation, and stress-related conditions.
Question 2: The concept of 'resonance frequency' in HRV biofeedback refers to the breathing rate that:
- Matches the client's heart rate
- Maximizes heart rate oscillation amplitude by synchronizing respiration with baroreflex oscillation (Correct answer)
- Produces the most alpha EEG activity
- Eliminates stress hormones fastest
Correct answer: Maximizes heart rate oscillation amplitude by synchronizing respiration with baroreflex oscillation
The resonance frequency (typically 4.5–7 breaths/min) is the individual breathing rate that creates maximum amplitude oscillations in HRV by coupling respiratory sinus arrhythmia with baroreflex sensitivity.
Question 3: Which of the following best describes the 'specificity' criterion in AAPB efficacy guidelines?
- The treatment works for a wide range of conditions
- The treatment outperforms credible control conditions in at least two independent research labs (Correct answer)
- The treatment has been approved by the FDA
- The treatment is described in at least 10 peer-reviewed papers
Correct answer: The treatment outperforms credible control conditions in at least two independent research labs
Specificity requires replication across independent laboratories and demonstrating superiority over credible control or active comparison conditions to rule out nonspecific effects.
Question 4: Thermal biofeedback (hand-warming) has the most established evidence for treating which condition?
- Hypertension
- Migraine headache and Raynaud's phenomenon (Correct answer)
- ADHD
- Chronic low back pain
Correct answer: Migraine headache and Raynaud's phenomenon
Thermal biofeedback is rated efficacious (Level 4) for both migraine headache and Raynaud's phenomenon, with multiple controlled studies demonstrating benefit.
Question 5: In evaluating biofeedback research, 'internal validity' refers to:
- How well results generalize to the broader population
- The degree to which a study correctly attributes outcomes to the treatment rather than confounds (Correct answer)
- Whether the same researcher can replicate results
- The accuracy of the instruments used
Correct answer: The degree to which a study correctly attributes outcomes to the treatment rather than confounds
Internal validity indicates the confidence with which a study's outcomes can be causally attributed to the experimental treatment rather than extraneous variables.
Question 6: The 'wait-list control' design in biofeedback research controls for which confound?
- Therapist allegiance effects
- Expectancy and placebo effects
- Spontaneous remission and the passage of time (Correct answer)
- Instrument calibration error
Correct answer: Spontaneous remission and the passage of time
A wait-list control group receives no treatment during the study period, controlling for natural symptom improvement over time (spontaneous remission).
BCIA Research & Evidence Base 2
HRV biofeedback has the strongest evidence base for which clinical application?