BCIA Autonomic Nervous System and HRV Training

Question 1

Heart rate variability (HRV) biofeedback primarily targets which division of the autonomic nervous system?

Accepted Answer

The balance between sympathetic and parasympathetic branches

Answer

HRV biofeedback targets the dynamic interplay between sympathetic and parasympathetic branches of the ANS; higher HRV generally reflects greater parasympathetic tone and autonomic flexibility.

Question 2

What is resonance frequency breathing in HRV biofeedback?

Accepted Answer

Breathing at approximately 4.5–7 breaths per minute to maximize respiratory sinus arrhythmia

Answer

Resonance frequency (typically 4.5–7 breaths/min, often ~6 breaths/min) is the breathing rate at which baroreflex gain is maximized, creating the largest oscillations in heart rate (RSA).

Question 3

The vagus nerve (cranial nerve X) is the primary pathway for which ANS effect on the heart?

Accepted Answer

Parasympathetic slowing of heart rate

Answer

The vagus nerve carries parasympathetic fibers that release acetylcholine at the SA node, slowing heart rate. Vagal tone is a key determinant of HRV and overall cardiac autonomic health.

Question 4

In HRV analysis, the RMSSD metric primarily reflects:

Accepted Answer

Short-term parasympathetic (vagal) activity

Answer

RMSSD (root mean square of successive differences between R-R intervals) is a time-domain HRV metric strongly associated with vagal/parasympathetic tone and short-term ANS regulation.

Question 5

The low-frequency (LF) band in HRV spectral analysis (0.04–0.15 Hz) is associated with:

Accepted Answer

Both sympathetic and parasympathetic influences, including baroreflex activity

Answer

The LF band reflects both sympathetic and parasympathetic contributions, particularly baroreflex-mediated oscillations. It is not a pure sympathetic measure, contrary to earlier interpretations.

BCIA - Biofeedback Certification International Alliance Practice Test

BCIA - Biofeedback Certification International Alliance Practice Test

BCIA Autonomic Nervous System and HRV Training